尼康d610报错fee，关于尼康G型镜头的一些八卦

尼康d610光圈老是报错

是光圈杆不到位的原因，机身不能识别光圈有两种可能1是镜头没装好，拆下重新装一次就行.2是有光圈环的镜头没有将光圈环置于最小光圈状态，将光圈环转到最小光圈(数字最大的那一档)，然后用光圈环边上一个小红色或橙色拨杆卡住光圈就好了.如果不是以上情况请写明机身镜头型号再问.

当缩小光圈的时候，在15mm焦距之下肯定报错在其他焦距之下可能报错在8mm焦距之下怎么搞都不报错。

D7100配8-15镜头，15mm下全开光圈拍摄没问题。只要缩小光圈，就报“ERR”错误其他焦距下可能报错，8mm下怎么搞都不报错。故障现象与D750搭配这支镜头的现象相同。

我想解释一下R21报错的含义。R21是尼康相机显示屏上的一个报错代码，它表示相机的缓冲区已满。在拍摄连续快门时，相机需要将图像数据存储在缓冲区中，然后再写入SD卡。当缓冲区满时，相机就会显示R21报错。

接下来我们来看一下如何处理这个问题。在遇到R21报错时，您可以尝试以下几种方法：

1、拍摄速度降低：将相机的拍摄速度调整到较慢的状态，这将减少相机写入SD卡的速度，从而减少缓冲区的负担。

2、更换高速SD卡：如果您使用的是低速SD卡，那么您可以考虑更换一张高速SD卡。高速SD卡可以更快地读写数据，从而减少缓冲区满的可能性。

3、减少连拍张数：如果您经常拍摄大量连拍照片，那么您可以尝试减少每次连拍的张数。这样可以减少相机写入SD卡的数据量，从而减轻缓冲区的负担。

让我们来看一下如何预防尼康D610出现R21报错的情况。

1、更新相机固件：尼康经常会发布相机固件更新，这些更新通常包含一些性能改进和问题修复。通过及时更新相机固件，您可以减少R21报错的可能性。

2、定期清理缓冲区：定期清理相机的缓冲区是非常重要的。当您的相机显示屏上出现R21报错时，您可以尝试将相机关机，然后打开再关机。这样会清理掉缓冲区中的数据，从而重新开始一个新的拍摄会话。

3、合理设置相机参数：合理设置相机的参数也可以帮助您减少R21报错的情况。例如，将相机的图像质量设置为JPEG会比RAW格式需要更少的写入时间，这可以减轻缓冲区的负担。

尼康d610报错r14

*Copyright(c)2000AppleComputer，Inc.Allrightsreserved.

**@APPLE_LICENSE_HEADER_START@

*ThecontentsofthisfileconstituteOriginalCodeasdefinedinand

*aresubjecttotheApplePublicSourceLicenseVersion1.1(the

*"License").Youmaynotusethisfileexceptincompliancewiththe

*License.PleaseobtainacopyoftheLicenseat

**/mfsprgr6，0

lwzr0，PP_INTSTACK_TOP_SS(r6)

lwzr11，PP_CPU_DATA(r6)

stwr0，PP_ISTACKPTR(r6)

stwr3，CPU_ACTIVE_THREAD(r11)

/*Findthenewstackandstoreitinactive_stacks*/

lwzr12，PP_ACTIVE_STACKS(r6)

lwzr1，THREAD_KERNEL_STACK(r3)

lwzr9，THREAD_TOP_ACT(r3)/*Pointtotheactiveactivation*/

stwr1，0(r12)

lir0，0/*Cleararegister*/

lwzr8，ACT_MACT_PCB(r9)/*Getthesaveareaused*/

lwzr10，SAVflags(r8)/*Getthesaveareaflags*/

rlwinmr10，r10，0，1，31/*Removetheattachedflag*/

stwr0，saver3(r8)/*Makesurewepassina0forthecontinuation*/

lwzr7，SACvrswap(r7)/*Getthetranslationfromvirtualtoreal*/

stwr0，FM_BACKPTR(r1)/*zerobackptr*/

stwr5，savesrr1(r8)/*PassourMSRtothenewguy*/

stwr10，SAVflags(r8)/*Passbacktheflags*/

/*

*Makethenewthreadthecurrentthread.

*/lwzr11，PP_CPU_DATA(r6)

stwr7，THREAD_KERNEL_STACK(r3)

stwr5，CPU_ACTIVE_THREAD(r11)

lwzr11，THREAD_KERNEL_STACK(r5)

lwzr5，THREAD_TOP_ACT(r5)

lwzr10，PP_ACTIVE_STACKS(r6)

lwzr7，CTHREAD_SELF(r5);Pickuptheuserassistword

lwzr8，ACT_MACT_PCB(r5);GetthePCBforthenewguystwr11，0(r10);Savethekernelstackaddress

stwr7，UAW(r6);Savetheassistwordforthe"ultrafastpath"lwzr11，ACT_MACT_BTE(r5);GetBlueBoxTaskEnvironmentlwzr7，ACT_MACT_SPF(r5);Getthespecialflagslwzr10，ACT_KLOADED(r5)

stwr11，ppbbTaskEnv(r6);Savethebbtaskenv

lir0，0cmpwicr0，r10，0

lwzr10，PP_ACTIVE_KLOADED(r6)

stwr7，spcFlags(r6);Setper_proccopyofthespecialflags

beqcr0，.L_sw_ctx_not_kldstwr5，0(r10)

lir10，MSR_SUPERVISOR_INT_OFF/*Gettheswitcher'sMSR*/

lwzr9，SAVflags(r8)/*Gettheflags*/

stwr10，savesrr1(r8)/*Setupforswitchin*/

*R3whereitbelongs.

*/blr/*Jumpintothenewthread*/

1：stwr5，savesrr0(r8)/*gotorealpc*/

stwr4，saver3(r8)/*mustpassbackoldthread*/

lir8，MSR_VM_OFF/*Settoeverythingoff*/

lwzr9，THREAD_TOP_ACT(r4)/*GettheswitchedfromACT*/

lwzr5，saver5(r3)/*Getthesrr0value*/

lwzr10，ACT_MACT_PCB(r9)/*GetthetopPCBontheoldthread*/

lwzr6，saver6(r3)/*Getthesrr1value*/

stwr3，ACT_MACT_PCB(r9)/*Putthenewoneontop*/

stwr10，SAVprev(r3)/*Chainontheoldone*/

;Contextdownload(operatesonowner'sdata)：;

;0)enablefacility;1)ifnoownerexittocontextrestore

;2)ifcontextprocessor！=currentprocessorexittocontextrestore;3)ifcurrentactivation==owneractivation：

;1)ifcurrlevel==activelevel：;1)iftopfacilitysaveareaexists：

;invalidatesaveareabysettinglevelto1;2)enablefacilityforuser

;3)exit;

;2)elsegoto5;

;4)ifcurrlevel==activelevel：;1)iftopfacilitysaveareaexists：

;1)iftopsavelevel==activelevelexittocontextrestore;

;5)allocatesavearea;1)ifthereisafacilitysaveanditisinvalid，selectit，andbreak

;2)scannormallistforfreefacilityarea，selectiffound，andbreak;3)scanotherfacilityforfreesave：select，iffound，andbreak

;4)allocateanewsavearea;

;6)savecontext;7)markfacilitysavewithcurrlevel

;;

;Contextrestore/upload(operatesoncurrentactivation'sdata)：;

;1)setcurrenttoactivation;2)setactiveleveltocurrentlevel

;3)setcontextprocessortocurrentprocessor;4)ifnofacilitysaveareaortopsavelevel！=currlevel

;initializefacilityregisterstoemptyvalue;5)else

;1)loadregistersfromsavearea;2)invalidatesaveareabysettinglevelto1

;;6)enablefacilityforuser

;7)exittointerruptreturn;

;;Contextsave(operatesonspecifiedactivation'sdata)：;1)ifnoownerexit

;2)ifowner！=specifiedactivationexit;3)ifcontextprocessor！=currentprocessor

;1)clearowner;2)exit

;;4)iffacilitytopsavearealevelexistsand==activelevelexit

;5)ifcurrlevel！=activelevelexit;6)allocatesavearea

;1)ifthereisafacilitysaveanditisinvalid，selectit，andbreak;2)scannormallistforfreefacilityarea，selectiffound，andbreak

;;

;Exceptionexit(hw_exceptions)：;

;1)disablereturnfacility;2)ifreturningsavearea！=activelevel

;1)ifowner！=currentactivationexit;2)ifcontextprocessor！=currentprocessor：

;1)clearowner;2)exit

;;3)ifnewlevel！=activelevelexit

;4)enablereturnfacility;5)exit

;;3)ifnofacilitysaveareaexit

;4)iftopsavelevel==activeortopisinvalid;1)dequeuetopfacilitysavearea

;2)setactiveleveltonewtopsavearea'slevel;3)releasesavearea

;4)ifowner==currentactivationclearowner;5)exit

lir2，0x6F00;(TEST/DEBUG)lir5，0;(TEST/DEBUG)

beq-noowneryet;(TEST/DEBUG)lwzr4，ACT_MACT_FPUlvl(r12);(TEST/DEBUG)

lwzr5，ACT_MACT_FPU(r12);(TEST/DEBUG)

lir3，0;Assumeweneedafix-me-upbeq-cr1，fsgoodcpu;Facilitylastusedonthisprocessor...

stwr3，PP_FPU_THREAD(r6);Clearownerbecauseitwasreallyontheotherprocessorbfsret;Bailnowwithnosave...fsgoodcpu：lwzr3，ACT_MACT_FPU(r12);GetthecurrentFPUsaveareaforthethread

lwzr9，ACT_MACT_FPUlvl(r12);Getourcurrentlevelindicatorcmplwicr1，r3，0;Haveweeversavedthisfacilitycontext？

beq-cr1，fsneedone;Neversavedit，soweneedanarea...lwzr8，SAVlvlfp(r3);Getthelevelthissaveareaisfor

blfpsrchsave;Findafreesaveareamfsprgr6，0;Getbackper_processorblock

orisr7，r7，hi16(SAVfpuvalid);Settheallocatedbitlwzr12，PP_FPU_THREAD(r6);Getbackourthread

mtlrr2;Restorereturnlwzr8，ACT_MACT_FPU(r12);Getthecurrenttopfloatingpointsavearea

lwzr9，ACT_MACT_FPUlvl(r12);Getourcurrentlevelindicatoragainstwr3，ACT_MACT_FPU(r12);SetthisasthelatestFPUsaveareaforthethread

stwr8，SAVprefp(r3);Andthenchainthisinfrontstwr7，SAVflags(r3);Setthevalidityflags

stwr12，SAVact(r3);Makesurewepointtotherightguy

fsusespare：stwr9，SAVlvlfp(r3);Andsetthelevelthissaveareaisfor;

;SavethecurrentFPUstateintothePCBofthethreadthatownsit.;lar11，savefp0(r3);Pointtothe1stline

dcbz0，r11;Allocatethefirstsavearealinelar11，savefp4(r3)/*Pointtothe2ndline*/

stfdf0，savefp0(r3)

dcbz0，r11/*allocateit*/

stfdf1，savefp1(r3)

stfdf2，savefp2(r3)

lar11，savefp8(r3)/*Pointtothe3rdline*/

stfdf3，savefp3(r3)

dcbz0，r11/*allocateit*/

stfdf4，savefp4(r3)

stfdf5，savefp5(r3)

stfdf6，savefp6(r3)

lar11，savefp12(r3)/*Pointtothe4thline*/

stfdf7，savefp7(r3)

dcbz0，r11/*allocateit*/

stfdf8，savefp8(r3)

stfdf9，savefp9(r3)

stfdf10，savefp10(r3)

lar11，savefp16(r3)/*Pointtothe5thline*/

stfdf11，savefp11(r3)

dcbz0，r11/*allocateit*/

stfdf12，savefp12(r3)

stfdf13，savefp13(r3)

stfdf14，savefp14(r3)

lar11，savefp20(r3)/*Pointtothe6thline*/

stfdf15，savefp15(r3)

stfdf16，savefp16(r3)

stfdf17，savefp17(r3)

stfdf18，savefp18(r3)

lar11，savefp24(r3)/*Pointtothe7thline*/

stfdf19，savefp19(r3)

dcbz0，r11/*allocateit*/

stfdf20，savefp20(r3)

lwzr10，liveFPSCR(r6);GetthepreviouslysavedFPSCR

stfdf21，savefp21(r3)stfdf22，savefp22(r3)

dcbz0，r11/*allocateit*/

stfdf24，savefp24(r3)

stfdf25，savefp25(r3)

stfdf26，savefp26(r3)

stfdf27，savefp27(r3)

stfdf28，savefp28(r3)

;inthe"normal"contextareaofthesavearea.

stwr9，savefpscrpad(r3);SavetheFPSCRpad

stwr10，savefpscr(r3);SavetheFPSCRstfdf29，savefp29(r3)

stfdf30，savefp30(r3)

stfdf31，savefp31(r3)

lfdf0，savefp0(r3);WeneedtorestoreF0becauseweusedit

;togettheFPSCR#if0

lar9，savefp0(r3);(TEST/DEBUG)

lar10，savefp31(r3);(TEST/DEBUG)chkkillmedead：

lhar8，0(r9);(TEST/DEBUG)

ble+cr1，chkkillmedead;(TEST/DEBUG)#endif

fsret：lwzr4，ACT_MACT_FPUcpu(r12);GetbacktheownerCPU

rlwinmr4，r4，0，fvChkb+1，31;Clearlocksyncstwr4，ACT_MACT_FPUcpu(r12);Unlockthecontextfsretnr：mtmsrr0;Putinterruptsoniftheywereandfloatingpointoff

#endif/*DEBUG*/

mfsprgr6，0;Gettheper_processorblock

mfmsrr19;GetthecurrentMSRlwzr10，PP_CPU_DATA(r6);GettheCPUdatapointer

lwzr12，PP_FPU_THREAD(r6);GetthethreadthatownstheFPUlwzr10，CPU_ACTIVE_THREAD(r10);Getthepointertotheactivethread

orir19，r19，lo16(MASK(MSR_FP));Enablethefloatingpointfeaturelwzr17，THREAD_TOP_ACT(r10);Nowgettheactivationthatisrunning;R12hasthe"old"activation

bne-fsSpin1;Someoneismessingrightnow

isync;Makesureweseeeverythinglwzr15，ACT_MACT_PCB(r12);Getthecurrentlevelofthe"old"one

cmplwr18，r19;ChecktheCPUthattheoldcontextisliveonlwzr14，ACT_MACT_FPU(r12);Pointtothetopoftheoldcontextstack

bne-fsnosaverel;ContextisnotliveifusedonadifferentCPU...lwzr13，ACT_MACT_FPUlvl(r12);Getthe"old"activelevel;

sc;(TEST/DEBUG)#endif

blfpsrchsave;Findafreesaveareastwr3，ACT_MACT_FPU(r12);Setthisasthelatestcontextsaveareaforthethread

mfsprgr6，0;Getbackper_processorblockstwr14，SAVprefp(r3);Andthenchainthisinfront

orisr7，r7，hi16(SAVfpuvalid);Settheallocatedbitstwr12，SAVact(r3);Makesurewepointtotherightguy

stwr7，SAVflags(r3);Settheallocationflags

fsusecache：lar11，savefp0(r3);Pointtothe1stlineinarea

stwr13，SAVlvlfp(r3);Setthiscontextlevel#ifFPVECDBG

#endif

;Nowwewillactuallysavetheoldcontext;dcbz0，r11;Allocatetheoutputarealar11，savefp4(r3);Pointtothe2ndline

stfdf0，savefp0(r3)dcbz0，r11;Allocatecache

stfdf1，savefp1(r3)stfdf2，savefp2(r3)

lar11，savefp8(r3);Pointtothe3rdline

stfdf3，savefp3(r3)dcbz0，r11;Allocatecache

stfdf4，savefp4(r3)stfdf5，savefp5(r3)

stfdf6，savefp6(r3)

lar11，savefp12(r3);Pointtothe4thline

stfdf7，savefp7(r3)dcbz0，r11;Allocatecache

stfdf8，savefp8(r3)stfdf9，savefp9(r3)

stfdf10，savefp10(r3)

lar11，savefp16(r3);Pointtothe5thline

stfdf11，savefp11(r3)dcbz0，r11;Allocatecache

stfdf12，savefp12(r3)stfdf13，savefp13(r3)

stfdf14，savefp14(r3)

lir14，0;Clearthisfornow

lwzr15，liveFPSCR(r6);GetthepreviouslysavedFPSCR

stfdf21，savefp21(r3)

stfdf22，savefp22(r3)

lar11，savefp28(r3);Pointtothe8thline

stfdf23，savefp23(r3)dcbz0，r11;allocateit

stfdf24，savefp24(r3)stfdf25，savefp25(r3)

stfdf26，savefp26(r3)

lar11，savefpscrpad(r3);Pointtothe9thline

stfdf27，savefp27(r3)dcbz0，r11;allocateit

stfdf28，savefp28(r3)stfdf29，savefp29(r3)

stfdf30，savefp30(r3)

stfdf31，savefp31(r3)

;inthe"normal"contextareaofthesavearea.

stwr14，savefpscrpad(r3);SavetheFPSCRpad

stwr15，savefpscr(r3);SavetheFPSCR

bne-fsSpin2;Someoneismessingrightnow

isync;Makesureweseeeverythinglwzr15，ACT_MACT_PCB(r17);Getthecurrentlevelofthe"new"one

lwzr14，ACT_MACT_FPU(r17);Pointtothetopofthe"new"contextstacklwzr13，ACT_MACT_FPUlvl(r17);Getthe"new"activelevel

#endif

cmplwicr1，r14，0;Dowepossiblyhavesomecontexttoload？

stwr15，ACT_MACT_FPUlvl(r17);Setthe"new"activelevellar11，savefp0(r14);Pointtofirstlinetobringin

stwr17，PP_FPU_THREAD(r6);Storecurrentthreadaddressinfpu_threadtoclaimfpuforthreadbeq+cr1，MakeSureThatNoTerroristsCanHurtUsByGod;No"new"contexttoload...

lwzr0，SAVlvlfp(r14);Gettheleveloffirstfacilitysaveareacmplwr0，r15;Toplevelcorrecttoload？

dcbt0，r11;Touchlinein

lir0，1;Getthelevelinvalidindicationlar11，savefp4(r14);Pointtonextline

dcbt0，r11;Touchlineinlfdf0，savefp0(r14)

lfdf1，savefp1(r14)

stwr0，SAVlvlfp(r14);Markthesaveareainvalidbecauseweareactivatingagain

lfdf2，savefp2(r14)lar11，savefp8(r14);Pointtonextline

lfdf3，savefp3(r14)dcbt0，r11;Touchlinein

lfdf4，savefp4(r14)lfdf5，savefp5(r14)

lfdf6，savefp6(r14)

lar11，savefp12(r14);Pointtonextline

lfdf7，savefp7(r14)dcbt0，r11;Touchlinein

lfdf8，savefp8(r14)lfdf9，savefp9(r14)

lfdf10，savefp10(r14)

lar11，savefp16(r14);Pointtonextline

lfdf11，savefp11(r14)dcbt0，r11;Touchlinein

lfdf12，savefp12(r14)lfdf13，savefp13(r14)

dcbt0，r11;Touchlinein

lfdf24，savefp24(r14)lfdf25，savefp25(r14)

lfdf26，savefp26(r14)

lfdf27，savefp27(r14)

lfdf28，savefp28(r14)

lfdf29，savefp29(r14)

lfdf30，savefp30(r14)

lfdf31，savefp31(r14)

fsenablexx：sync;Makesureallissaved

stwr18，ACT_MACT_FPUcpu(r17);SettheactiveCPUandrelease

fsenable：lwzr9，SAVflags(r4)/*Gettheflagsofthecurrentsavearea*/

lwzr8，savesrr1(r4);Getthemsroftheinterruptedguy

rlwinmr5，r4，0，0，19/*Getthepageaddressofthesavearea*/orir8，r8，MASK(MSR_FP);Enablethefloatingpointfeature

lwzr10，ACT_MACT_SPF(r17);Getthespecialflagslisr7，hi16(SAVattach)/*Gettheattachedflag*/

lwzr5，SACvrswap(r5)/*GetVirtualtoRealtranslation*/

;fpsrchsave：

lwzr6，ACT_MACT_PCB(r12);Getthefirst"normal"saveareafpsrnorm：mr.r5，r6;Isthereanother？

beq-fpsrvect;No，searchthevectorsaveareas...lwzr7，SAVflags(r5);Gettheflagsforthisguy

lwzr6，SAVprev(r5);Gettheprevioussavearea，justincaseandis.r8，r7，hi16(SAVfpuvalid);HavewefoundanemptyFPUsaveinnormal？

beq+fpsrgot;Wefoundone...bfpsrnorm;Searchagain...fpsrvect：lwzr6，ACT_MACT_VMX(r12);Getthefirst"vector"saveareafpsrvectx：mr.r5，r6;Isthereanother？

beq-fpsrget;No，trytoallocateone...lwzr7，SAVflags(r5);Gettheflagsforthisguy

lwzr6，SAVprevec(r5);Gettheprevioussavearea，justincaseandis.r8，r7，hi16(SAVfpuvalid);HavewefoundanemptyFPUsaveinvector？

lir2，0x5F00;(TEST/DEBUG)lir5，0;(TEST/DEBUG)

beq-noowneryeu;(TEST/DEBUG)lwzr4，ACT_MACT_VMXlvl(r12);(TEST/DEBUG)

lwzr5，ACT_MACT_VMX(r12);(TEST/DEBUG)

lir3，0;Assumeweneedafix-me-upbeq-cr1，vsgoodcpu;Facilitylastusedonthisprocessor...

stwr3，PP_VMX_THREAD(r6);Clearownerbecauseitwasreallyontheotherprocessorbvsret;Bailnowwithnosave...vsgoodcpu：lwzr3，ACT_MACT_VMX(r12);Getthecurrentvectorsaveareaforthethread

lwzr9，ACT_MACT_VMXlvl(r12);Getourcurrentlevelindicatorcmplwicr1，r3，0;Haveweeversavedthisfacilitycontext？

beq-cr1，vsneedone;Neversavedit，soweneedanarea...lwzr8，SAVlvlvec(r3);Getthelevelthissaveareaisfor

blvsrchsave;Findafreesaveareamfsprgr6，0;Getbackper_processorblock

orisr7，r7，hi16(SAVvmxvalid);Settheallocatedbitlwzr12，PP_VMX_THREAD(r6);Getbackourthread

mtlrr2;Restorereturnlwzr8，ACT_MACT_VMX(r12);Getthecurrenttopvectorsavearea

lwzr9，ACT_MACT_VMXlvl(r12);Getourcurrentlevelindicatoragainstwr3，ACT_MACT_VMX(r12);Setthisasthelatestvectorsaveareaforthethread

stwr8，SAVprevec(r3);Andthenchainthisinfrontstwr7，SAVflags(r3);Settheallocationflags

stwr12，SAVact(r3);Makesurewepointtotherightguy

vsusespare：stwr9，SAVlvlvec(r3);Andsetthelevelthissaveareaisfor

mfcrr2;Savenon-volatileCRslwzr10，liveVRS(r6);GettherightVRSaveregister

lisr9，0x5555;Maskwithoddbitssetrlwinmr11，r10，1，0，31;Shiftover1

orir9，r9，0x5555;Finishmaskorr4，r10，r11;Afterthis，evenbitsshowwhichlinestozapandcr11，r4，r9;Clearoutoddbitslar6，savevr0(r3);Pointtoline0

rlwinmr4，r11，15，0，15;Moveline8-15flagstohighorderoddbitslar9，savevrvalid(r3);Pointtothesavedregistermaskfield

;bit2isline1，bit3isline9，etc.dcbabr0，r9;Allocatethecacheforit

rlwimir4，r10，16，16，31;Putvrsave0-15intopositions16-31lar7，savevr2(r3);Pointtoline1

mtcrf255，r4;LoaduptheCRsstwr10，savevrvalid(r3);Savethevalidityinformation

lir11，16;Getoffsetforoddregisters

bf16，snovr0;DonotsaveVR0...stvxlv0，br0，r8;SaveVR0snovr0：

lar9，savevr2(r3);PointtoV2/V3pair

bf17，snovr1;DonotsaveVR1...stvxlv1，r11，r8;SaveVR1snovr1：

lar6，savevr8(r3);Pointtoline4

bf6，snol3;Noline3todo...dcbabr0，r7;Allocatecacheline3snol3：

lar8，savevr4(r3);PointtoV4/V5pair

bf18，snovr2;DonotsaveVR2...stvxlv2，br0，r9;SaveVR2snovr2：

bf19，snovr3;DonotsaveVR3...

dcbabr0，r6;Allocatecacheline4snol4：

lar9，savevr6(r3);PointtoR6/R7pair

bf20，snovr4;DonotsaveVR4...stvxlv4，br0，r8;SaveVR4snovr4：

bf21，snovr5;DonotsaveVR5...

dcbabr0，r7;Allocatecacheline5snol5：

lar8，savevr8(r3);PointtoV8/V9pair

bf22，snovr6;DonotsaveVR6...stvxlv6，br0，r9;SaveVR6snovr6：

bf23，snovr7;DonotsaveVR7...

dcbabr0，r6;Allocatecacheline6snol6：

lar9，savevr10(r3);PointtoV10/V11pair

bf24，snovr8;DonotsaveVR8...stvxlv8，br0，r8;SaveVR8snovr8：

bf25，snovr9;DonotsaveVR9...

dcbabr0，r7;Allocatecacheline7snol7：

lar8，savevr12(r3);PointtoV12/V13pair

bf26，snovr10;DonotsaveVR10...stvxlv10，br0，r9;SaveVR10snovr10：

bf27，snovr11;DonotsaveVR11...

dcbabr0，r6;Allocatecacheline8snol8：

lar9，savevr14(r3);PointtoV14/V15pair

bf28，snovr12;DonotsaveVR12...stvxlv12，br0，r8;SaveVR12snovr12：

bf29，snovr13;DonotsaveVR13...

dcbabr0，r7;Allocatecacheline9snol9：

lar8，savevr16(r3);PointtoV16/V17pair

bf30，snovr14;DonotsaveVR14...stvxlv14，br0，r9;SaveVR14snovr14：

bf31，snovr15;DonotsaveVR15...

dcbabr0，r6;Allocatecacheline10snol10：

lar9，savevr18(r3);PointtoV18/V19pair

bf16，snovr16;DonotsaveVR16...stvxlv16，br0，r8;SaveVR16snovr16：

bf17，snovr17;DonotsaveVR17...

bf7，snol11;Noline11todo...dcbabr0，r7;Allocatecacheline11snol11：

lar8，savevr20(r3);PointtoV20/V21pair

bf18，snovr18;DonotsaveVR18...stvxlv18，br0，r9;SaveVR18snovr18：

bf19，snovr19;DonotsaveVR19...

bf9，snol12;Noline12todo...dcbabr0，r6;Allocatecacheline12snol12：

lar9，savevr22(r3);PointtoV22/V23pair

bf20，snovr20;DonotsaveVR20...stvxlv20，br0，r8;SaveVR20snovr20：

bf21，snovr21;DonotsaveVR21...

bf11，snol13;Noline13todo...dcbabr0，r7;Allocatecacheline13snol13：

lar8，savevr24(r3);PointtoV24/V25pair

bf22，snovr22;DonotsaveVR22...stvxlv22，br0，r9;SaveVR22snovr22：

bf23，snovr23;DonotsaveVR23...

bf13，snol14;Noline14todo...dcbabr0，r6;Allocatecacheline14snol14：

lar9，savevr26(r3);PointtoV26/V27pair

bf24，snovr24;DonotsaveVR24...stvxlv24，br0，r8;SaveVR24snovr24：

bf25，snovr25;DonotsaveVR25...

stvxlv27，r11，r9;SaveVR27snovr27：

lar7，savevr30(r3);PointtoV30/V31pair

bf28，snovr28;DonotsaveVR28...stvxlv28，br0，r8;SaveVR28snovr28：

bf29，snovr29;DonotsaveVR29...

lvxlv27，br0，r11;RestoreorloademptyvalueintoV27becauseweusedit

;Savethecurrentvectorstateintothesaveareaofthethreadthatownsit.;vsret：lwzr4，ACT_MACT_VMXcpu(r12);GetbacktheownerCPU

rlwinmr4，r4，0，fvChkb+1，31;Clearlocksyncstwr4，ACT_MACT_VMXcpu(r12);Unlockthecontextvsretnr：mtmsrr0;Putinterruptsoniftheywereandvectoroff

mfmsrr19/*GetthecurrentMSR*/

lwzr10，PP_CPU_DATA(r6)/*GettheCPUdatapointer*/

lwzr12，PP_VMX_THREAD(r6)/*Getthethreadthatownsthevector*/

lwzr10，CPU_ACTIVE_THREAD(r10)/*Getthepointertotheactivethread*/

bne-vsSpin1;Someoneismessingrightnow

isync;Makesureweseeeverythinglwzr15，ACT_MACT_PCB(r12);Getthecurrentlevelofthe"old"one

cmplwr18，r19;ChecktheCPUthattheoldcontextisliveonlwzr14，ACT_MACT_VMX(r12);Pointtothetopoftheoldcontextstack

bne-vsnosaverel;ContextisnotliveifusedonadifferentCPU...lwzr13，ACT_MACT_VMXlvl(r12);Getthe"old"activelevel;

#endif#endif

blvsrchsave;Findafreesaveareastwr3，ACT_MACT_VMX(r12);Setthisasthelatestcontextsaveareaforthethread

mfsprgr6，0;Getbackper_processorblockstwr14，SAVprevec(r3);Andthenchainthisinfront

orisr7，r7，hi16(SAVvmxvalid);Settheallocatedbitstwr12，SAVact(r3);Makesurewepointtotherightguy

stwr7，SAVflags(r3);Settheallocationflags

vsusecache：lar11，savevr0(r3);Pointtothe1stlineinarea

stwr13，SAVlvlvec(r3);Setthiscontextlevel#ifFPVECDBG

lisr9，0x5555;Maskwithoddbitssetrlwinmr11，r10，1，0，31;Shiftover1

orir9，r9，0x5555;Finishmaskorr21，r10，r11;Afterthis，evenbitsshowwhichlinestozapstwr13，SAVlvlvec(r3);Setthesavearealevel

andcr13，r21，r9;Clearoutoddbitslar20，savevr0(r3);Pointtoline0

rlwinmr24，r13，15，0，15;Moveline8-15flagstohighorderoddbitslar23，savevrvalid(r3);Pointtothesavedregistermaskfield

;bit2isline1，bit3isline9，etc.dcbabr0，r23;Allocatethecacheforit

rlwimir24，r10，16，16，31;Putvrsave0-15intopositions16-31lar21，savevr2(r3);Pointtoline1

mtcrf255，r24;LoaduptheCRsstwr10，savevrvalid(r3);Savethevalidityinformation

lir30，16;Getoffsetforoddregisters

bf16，novr0;DonotsaveVR0...stvxlv0，br0，r22;SaveVR0novr0：

lar23，savevr2(r3);PointtoV2/V3pair

bf17，novr1;DonotsaveVR1...stvxlv1，r30，r22;SaveVR1novr1：

lar20，savevr8(r3);Pointtoline4

bf6，nol3;Noline3todo...dcbabr0，r21;Allocatecacheline3nol3：

lar22，savevr4(r3);PointtoV4/V5pair

bf18，novr2;DonotsaveVR2...stvxlv2，br0，r23;SaveVR2novr2：

bf19，novr3;DonotsaveVR3...

dcbabr0，r20;Allocatecacheline4nol4：

lar23，savevr6(r3);PointtoR6/R7pair

bf20，novr4;DonotsaveVR4...stvxlv4，br0，r22;SaveVR4novr4：

bf21，novr5;DonotsaveVR5...

dcbabr0，r21;Allocatecacheline5nol5：

lar22，savevr8(r3);PointtoV8/V9pair

bf22，novr6;DonotsaveVR6...stvxlv6，br0，r23;SaveVR6novr6：

bf23，novr7;DonotsaveVR7...

dcbabr0，r20;Allocatecacheline6nol6：

lar23，savevr10(r3);PointtoV10/V11pair

bf24，novr8;DonotsaveVR8...stvxlv8，br0，r22;SaveVR8novr8：

bf25，novr9;DonotsaveVR9...

dcbabr0，r21;Allocatecacheline7nol7：

lar22，savevr12(r3);PointtoV12/V13pair

bf26，novr10;DonotsaveVR10...stvxlv10，br0，r23;SaveVR10novr10：

bf27，novr11;DonotsaveVR11...

dcbabr0，r20;Allocatecacheline8nol8：

lar23，savevr14(r3);PointtoV14/V15pair

bf28，novr12;DonotsaveVR12...stvxlv12，br0，r22;SaveVR12novr12：

bf29，novr13;DonotsaveVR13...

dcbabr0，r21;Allocatecacheline9nol9：

lar22，savevr16(r3);PointtoV16/V17pair

bf30，novr14;DonotsaveVR14...stvxlv14，br0，r23;SaveVR14novr14：

bf31，novr15;DonotsaveVR15...

dcbabr0，r20;Allocatecacheline10nol10：

lar23，savevr18(r3);PointtoV18/V19pair

bf16，novr16;DonotsaveVR16...stvxlv16，br0，r22;SaveVR16novr16：

bf17，novr17;DonotsaveVR17...

bf7，nol11;Noline11todo...dcbabr0，r21;Allocatecacheline11nol11：

lar22，savevr20(r3);PointtoV20/V21pair

bf18，novr18;DonotsaveVR18...stvxlv18，br0，r23;SaveVR18novr18：

bf19，novr19;DonotsaveVR19...

bf9，nol12;Noline12todo...dcbabr0，r20;Allocatecacheline12nol12：

lar23，savevr22(r3);PointtoV22/V23pair

bf20，novr20;DonotsaveVR20...stvxlv20，br0，r22;SaveVR20novr20：

bf21，novr21;DonotsaveVR21...

bf11，nol13;Noline13todo...dcbabr0，r21;Allocatecacheline13nol13：

lar22，savevr24(r3);PointtoV24/V25pair

bf22，novr22;DonotsaveVR22...stvxlv22，br0，r23;SaveVR22novr22：

bf23，novr23;DonotsaveVR23...

bf13，nol14;Noline14todo...dcbabr0，r20;Allocatecacheline14nol14：

lar23，savevr26(r3);PointtoV26/V27pair

bf24，novr24;DonotsaveVR24...stvxlv24，br0，r22;SaveVR24novr24：

bf25，novr25;DonotsaveVR25...

stvxlv27，r30，r23;SaveVR27novr27：

lar23，savevr30(r3);PointtoV30/V31pair

bf28，novr28;DonotsaveVR28...stvxlv28，br0，r22;SaveVR28novr28：

mfvscrv27;GettheVSCR

bf29，novr29;DonotsaveVR29...stvxlv29，r30，r22;SaveVR29novr29：

lar22，savevscr(r3);PointtotheVSCRsavearea

bf30，novr30;DonotsaveVR30...stvxlv30，br0，r23;SaveVR30novr30：

bne-vsSpin2;Someoneismessingrightnow

isync;Makesureweseeeverythinglwzr15，ACT_MACT_PCB(r17);Getthecurrentlevelofthe"new"one

lwzr14，ACT_MACT_VMX(r17);Pointtothetopofthe"new"contextstacklwzr13，ACT_MACT_VMXlvl(r17);Getthe"new"activelevel#ifFPVECDBG

#endif

cmplwicr1，r14，0;Dowepossiblyhavesomecontexttoload？

stwr15，ACT_MACT_VMXlvl(r17);Setthe"new"activelevellar23，savevscr(r14);PointtotheVSCR

lar20，savevr0(r14);Pointtofirstlinetobringinstwr17，PP_VMX_THREAD(r6);Storecurrentthreadaddressinvmx_threadtoclaimvectorforthread

beq-cr1，ProtectTheAmericanWay;Nothingtorestore，firsttimeuse...lwzr0，SAVlvlvec(r14);Gettheleveloffirstfacilitysavearea

orir9，r9，0x5555;Finishmaskrlwinmr11，r10，1，0，31;Shiftover1

stwr0，SAVlvlvec(r14);Markthesaveareainvalidbecauseweareactivatingagainorr12，r10，r11;Afterthis，evenbitsshowwhichlinestotouch

dcbtbr0，r23;TouchintheVSCRandcr13，r12，r9;Clearoutoddbitslar20，savevr0(r14);Pointtoline0

rlwinmr3，r13，15，0，15;Moveline8-15flagstohighorderoddbitslar21，savevr2(r3);Pointtoline1

lir30，16;Getoffsetforoddregisters

bf16，lnovr0;DonotrestoreVR0...lvxlv0，br0，r22;RestoreVR0lnovr0：

lar23，savevr2(r14);PointtoV2/V3pair

bf17，lnovr1;DonotrestoreVR1...lvxlv1，r30，r22;RestoreVR1lnovr1：

lar20，savevr8(r14);Pointtoline4

bf6，lnol3;Noline3todo...dcbtbr0，r21;Touchcacheline3lnol3：

lar22，savevr4(r14);PointtoV4/V5pair

bf18，lnovr2;DonotrestoreVR2...lvxlv2，br0，r23;RestoreVR2lnovr2：

bf19，lnovr3;DonotrestoreVR3...

dcbtbr0，r20;Touchcacheline4lnol4：

lar23，savevr6(r14);PointtoR6/R7pair

bf20，lnovr4;DonotrestoreVR4...lvxlv4，br0，r22;RestoreVR4lnovr4：

bf21，lnovr5;DonotrestoreVR5...

dcbtbr0，r21;Touchcacheline5lnol5：

lar22，savevr8(r14);PointtoV8/V9pair

bf22，lnovr6;DonotrestoreVR6...lvxlv6，br0，r23;RestoreVR6lnovr6：

bf23，lnovr7;DonotrestoreVR7...

dcbtbr0，r20;Touchcacheline6lnol6：

lar23，savevr10(r14);PointtoV10/V11pair

bf24，lnovr8;DonotrestoreVR8...lvxlv8，br0，r22;RestoreVR8lnovr8：

bf25，lnovr9;DonotsaveVR9...

dcbtbr0，r21;Touchcacheline7lnol7：

lar22，savevr12(r14);PointtoV12/V13pair

bf26，lnovr10;DonotrestoreVR10...lvxlv10，br0，r23;RestoreVR10lnovr10：

bf27，lnovr11;DonotrestoreVR11...

dcbtbr0，r20;Touchcacheline8lnol8：

lar23，savevr14(r14);PointtoV14/V15pair

bf28，lnovr12;DonotrestoreVR12...lvxlv12，br0，r22;RestoreVR12lnovr12：

bf29，lnovr13;DonotrestoreVR13...

dcbtbr0，r21;Touchcacheline9lnol9：

lar22，savevr16(r14);PointtoV16/V17pair

bf30，lnovr14;DonotrestoreVR14...lvxlv14，br0，r23;RestoreVR14lnovr14：

bf31，lnovr15;DonotrestoreVR15...

dcbtbr0，r20;Touchcacheline10lnol10：

lar23，savevr18(r14);PointtoV18/V19pair

bf16，lnovr16;DonotrestoreVR16...lvxlv16，br0，r22;RestoreVR16lnovr16：

bf17，lnovr17;DonotrestoreVR17...

bf7，lnol11;Noline11todo...dcbtbr0，r21;Touchcacheline11lnol11：

lar22，savevr20(r14);PointtoV20/V21pair

bf18，lnovr18;DonotrestoreVR18...lvxlv18，br0，r23;RestoreVR18lnovr18：

bf19，lnovr19;DonotrestoreVR19...

bf9，lnol12;Noline12todo...dcbtbr0，r20;Touchcacheline12lnol12：

lar23，savevr22(r14);PointtoV22/V23pair

bf20，lnovr20;DonotrestoreVR20...lvxlv20，br0，r22;RestoreVR20lnovr20：

bf21，lnovr21;DonotrestoreVR21...

bf11，lnol13;Noline13todo...dcbtbr0，r21;Touchcacheline13lnol13：

lar22，savevr24(r14);PointtoV24/V25pair

bf22，lnovr22;DonotrestoreVR22...lvxlv22，br0，r23;RestoreVR22lnovr22：

bf23，lnovr23;DonotrestoreVR23...

bf13，lnol14;Noline14todo...dcbtbr0，r20;Touchcacheline14lnol14：

lar23，savevr26(r14);PointtoV26/V27pair

bf24，lnovr24;DonotrestoreVR24...lvxlv24，br0，r22;RestoreVR24lnovr24：

bf25，lnovr25;DonotrestoreVR25...

lvxlv27，r30，r23;RestoreVR27lnovr27：

lar23，savevr30(r14);PointtoV30/V31pair

bf28，lnovr28;DonotrestoreVR28...lvxlv28，br0，r22;RestoreVR28lnovr28：

bf29，lnovr29;DonotrestoreVR29...

vrenablexx：sync;Makesureallissaved

stwr18，ACT_MACT_VMXcpu(r17);SettheactiveCPUandreleasevrenable：

lwzr9，SAVflags(r4)/*Gettheflagsofthecurrentsavearea*/

lwzr8，savesrr1(r4);Getthemsroftheinterruptedguy

rlwinmr5，r4，0，0，19/*Getthepageaddressofthesavearea*/orisr8，r8，hi16(MASK(MSR_VEC));Enablethevectorfacility

lwzr10，ACT_MACT_SPF(r17);Getthespecialflagslisr7，hi16(SAVattach)/*Gettheattachedflag*/

lwzr5，SACvrswap(r5)/*GetVirtualtoRealtranslation*/

;andR3is0，anewareaisallocated.IfR3isnon-zero，itcontains;apointertoavectorsaveareathatisfree.

vsrchsave：lwzr6，ACT_MACT_PCB(r12);Getthefirst"normal"saveareavsrnorm：mr.r5，r6;Isthereanother？

beq-vsrvect;No，searchthefloatingpointsaveareas...lwzr7，SAVflags(r5);Gettheflagsforthisguy

lwzr6，SAVprev(r5);Gettheprevioussavearea，justincaseandis.r8，r7，hi16(SAVvmxvalid);Havewefoundanemptyvectorsaveinnormal？

beq+vsrgot;Wefoundone...bvsrnorm;Searchagain...vsrvect：lwzr6，ACT_MACT_FPU(r12);Getthefirst"floatingpoint"saveareavsrvectx：mr.r5，r6;Isthereanother？

beq-vsrget;No，trytoallocateone...lwzr7，SAVflags(r5);Gettheflagsforthisguy

lwzr6，SAVprefp(r5);Gettheprevioussavearea，justincaseandis.r8，r7，hi16(SAVvmxvalid);Havewefoundanemptyvectorsaveinfloat？

**/ENTRY(lfs，TAG_NO_FRAME_USED)

lfsf1，0(r3)

stfdf1，0(r4)

**/ENTRY(stfs，TAG_NO_FRAME_USED)

lfdf1，0(r3)

stfsf1，0(r4)

lwzr11，SAVprev(r8)/*Gettheprevioussavearea*/

mfmsrr5/*Sincewearepassingcontrol，getourMSRvalues*/

lwzr1，saver1(r8)/*Loadnewstackpointer*/

rlwinmr10，r10，0，1，31/*Removetheattachedflag*/

stwr0，saver3(r8)/*Makesurewepassina0forthecontinuation*/

lwzr7，SACvrswap(r7)/*Getthetranslationfromvirtualtoreal*/

stwr0，FM_BACKPTR(r1)/*zerobackptr*/

stwr5，savesrr1(r8)/*PassourMSRtothenewguy*/

stwr10，SAVflags(r8)/*Passbacktheflags*/

xorr3，r7，r8/*Getthephysicaladdressofthenewcontextsavearea*/

stwr11，ACT_MACT_PCB(r9)/*Unstackoursavearea*/

bEXT(exception_exit)/*Goenditall...*/

/*structthread_shuttle*Switch_context(structthread_shuttle*old，

*void(*cont)(void)，

*structthread_shuttle*new)

**Switchfromonethreadtoanother.Ifacontinuationissupplied，then

*wedonotneedtosavecalleesaveregisters.

**/

/*voidCall_continuation(void(*continuation)(void)，vm_offset_tstack_ptr)

*/

ENTRY(Call_continuation，TAG_NO_FRAME_USED)

mtlrr3

mrr1，r4/*Loadnewstackpointer*/

blr/*Jumptothecontinuation*/

/*

*Gettheoldkernelstack，andstoreintothethreadstructure.

*Seeifacontinuationissupplied，andskipstatesaveifso.

*NB.Continuationsarenolongerused，sothistestisomitted，

*asshouldthesecondargument，butitisingenericcode.

*Wealwayssavestate.Thisdoesnothurtevenifcontinuations

*areputbackin.

*/

/*Contextswitchesaredoublejumps.Wepassthefollowingtothe

*contextswitchfirmwarecall：

**R3=switchee'ssavearea

*R4=oldthread

*R5=newSRR0

*R6=newSRR1

**savesrr0issettogotoswitch_in

*savesrr1issettouninterruptiblewithtranslationon

*/

ENTRY(Switch_context，TAG_NO_FRAME_USED)

mfsprgr6，0/*Gettheper_procblock*/

lwzr12，PP_ACTIVE_STACKS(r6)

#ifDEBUG

lwzr11，PP_ISTACKPTR(r6);(DEBUG/TRACE)makesurewearenot

mr.r11，r11;(DEBUG/TRACE)ontheinterruptbne+notonintstack;(DEBUG/TRACE)stack

BREAKPOINT_TRAPnotonintstack：

#endif

stwr4，THREAD_CONTINUATION(r3)

cmpwicr1，r4，0/*usedwaaaaydownbelow*/

lwzr7，0(r12)

/*

*Makethenewthreadthecurrentthread.

*/lwzr11，PP_CPU_DATA(r6)

stwr7，THREAD_KERNEL_STACK(r3)

stwr5，CPU_ACTIVE_THREAD(r11)

lwzr11，THREAD_KERNEL_STACK(r5)

lwzr5，THREAD_TOP_ACT(r5)

lwzr10，PP_ACTIVE_STACKS(r6)

lwzr7，CTHREAD_SELF(r5);Pickuptheuserassistword

lwzr8，ACT_MACT_PCB(r5);GetthePCBforthenewguystwr11，0(r10);Savethekernelstackaddress

stwr7，UAW(r6);Savetheassistwordforthe"ultrafastpath"lwzr11，ACT_MACT_BTE(r5);GetBlueBoxTaskEnvironmentlwzr7，ACT_MACT_SPF(r5);Getthespecialflagslwzr10，ACT_KLOADED(r5)

stwr11，ppbbTaskEnv(r6);Savethebbtaskenv

lir0，0cmpwicr0，r10，0

lwzr10，PP_ACTIVE_KLOADED(r6)

stwr7，spcFlags(r6);Setper_proccopyofthespecialflags

beqcr0，.L_sw_ctx_not_kldstwr5，0(r10)

b.L_sw_ctx_cont

.L_sw_ctx_not_kld：

stwr0，0(r10)/*act_kloaded=0*/

.L_sw_ctx_cont：

lisr10，hi16(EXT(trcWork));Gettopoftracemask

rlwinmr7，r8，0，0，19/*Switchtosaveareabase*/orir10，r10，lo16(EXT(trcWork));Getbottomofmask

lwzr11，SAVprev(r8)/*Getthepreviousoftheswitchee'ssavearea*/lwzr10，traceMask(r10);Gettheenabledtraces

lisr0，hi16(CutTrace);TraceFWcallmr.r10，r10;Anytracinggoingon？

orir0，r0，lo16(CutTrace);TraceFWcallbeq+cswNoTrc;Notracetoday，dude...

mrr10，r3;Saveacrosstracelwzr2，THREAD_TOP_ACT(r3);Traceoldactivation

mrr3，r11;Traceprevsaveareasc;Cuttraceentryofcontextswitch

mrr3，r10;RestorecswNoTrc：mfmsrr6/*GettheMSRbecausetheswitchedtothreadshouldinheritit*/

lwzr7，SACvrswap(r7)/*Getthetranslationfromvirtualtoreal*/

lisr0，hi16(SwitchContextCall)/*Toppartofswitchcontext*/

lisr9，hi16(EXT(switch_in))/*Gettopofswitchinroutine*/

stwr11，ACT_MACT_PCB(r5)/*Dequeuethesaveareawe'reswitchingto*/

rlwinmr6，r6，0，MSR_FP_BIT+1，MSR_FP_BIT-1/*TurnofftheFP*/

orir9，r9，lo16(EXT(switch_in))/*Bottomhalfofswitchin*/

lwzr5，savesrr0(r8)/*SetupthenewSRR0*/

rlwinmr6，r6，0，MSR_VEC_BIT+1，MSR_VEC_BIT-1/*Turnoffthevector*/

mrr4，r3/*Saveouroldthreadtopassback*/

stwr9，savesrr0(r8)/*Makeusjumptotheswitchinroutine*/

lir10，MSR_SUPERVISOR_INT_OFF/*Gettheswitcher'sMSR*/

lwzr9，SAVflags(r8)/*Gettheflags*/

stwr10，savesrr1(r8)/*Setupforswitchin*/

rlwinmr9，r9，0，15，13/*Resetthesyscallflag*/

orir0，r0，lo16(SwitchContextCall)/*Bottompartofswitchcontext*/

rlwinmr9，r9，0，1，31/*Cleartheattachedflag*/

xorr3，r7，r8/*Getthephysicaladdressofthenewcontextsavearea*/

stwr9，SAVflags(r8)/*Settheflags*/

/*ifblockingoncontinuationavoidsavingstate*/

bnecr1，1f

sc/*Switchtothenewcontext*/

/*Wecomebackhereinthenewthreadcontext

*R4wassettoholdtheoldthreadpointer，butswitch_inwillputitinto

*R3whereitbelongs.

*/blr/*Jumpintothenewthread*/

1：stwr5，savesrr0(r8)/*gotorealpc*/

stwr4，saver3(r8)/*mustpassbackoldthread*/

bEXT(exception_exit)/*blockingoncontinuation，avoidstatesave*/

/*

*Allswitchedtothreadscomeherefirsttocleanuptheoldthread.

*Weneedtodothefollowingcontortionsbecauseweneedtokeep

*theLRclean.Andbecauseweneedtomanipulatethesaveareachain

*withtranslationon.Ifwecould，thisshouldbedoneinlowmem_vectors

*beforetranslationisturnedon.Butwecan't，dangit！

**R3=switcher'ssavearea

*saver4=oldthreadinswitcher'ssave

*saver5=newSRR0inswitcher'ssave

*saver6=newSRR1inswitcher'ssave

*/ENTRY(switch_in，TAG_NO_FRAME_USED)

lwzr4，saver4(r3)/*Gettheoldthread*/

lir8，MSR_VM_OFF/*Settoeverythingoff*/

lwzr9，THREAD_TOP_ACT(r4)/*GettheswitchedfromACT*/

lwzr5，saver5(r3)/*Getthesrr0value*/

lwzr10，ACT_MACT_PCB(r9)/*GetthetopPCBontheoldthread*/

lwzr6，saver6(r3)/*Getthesrr1value*/

stwr3，ACT_MACT_PCB(r9)/*Putthenewoneontop*/

stwr10，SAVprev(r3)/*Chainontheoldone*/

mrr3，r4/*Passbacktheoldthread*/

mtsrr0r5/*Setreturnpoint*/

mtsrr1r6/*SetreturnMSR*/

rfi/*Jam...*/

.long0

.long0

.long0

.long0

.long0

.long0

.long0

.long0

/*

*voidfpu_save(thread_act_tact)

**TodothefloatingpointandVMX，wekeepthreethreadpointers：one

*tothecurrentthread，onetothethreadthathasthefloatingpointcontext

*loadedintotheFPUregisters，andonefortheVMXowner.

**EachofthesethreadshasthreePCBpointers.ThenormalPCB，theFPUpcb，

*andtheVMXpcb.Thereisalsoabitforeachinthesaveareaflags.

*Whenwetakeanexception，orneedtousetheFPU/VMXinthekernel，wecall

*thisroutine.Itcheckstoseeifthereisanownerthreadforthefacility.

*Ifso，itsavesthefacility'sstateinformationinthenormalPCB.Then，it

*turnsontheappropriateflaginthesaveareatoindicatethatthestateis

*inthatparticularsavearea.Also，thethreadpointerfortheownerin

*theper_processorblockiscleared.Notethatwedon'thavetoworryaboutthe

*PCBpointersinthethreadbecausewheneverthestateisloaded，theassociated

*saveareaisreleasedandthepointercleared.Thisisdonesothatthefacility

*contextalwaysmigratestothenormalsavearea/PCB.Thisalwaysinsuresthat

*nomorethan2saveareasareusedforathread.

**Whenthecontextisloadedintothefacility，theassociatedPCBisreleasedif

*itsusageflagsindicatethatitisempty.(Notethatreturnfromexceptionand

*contextswitchhonortheseflagsandwon'treleaseasaveareaifthereisunrestored

*facilitycontext.)Theper_processorissettopointtothefacilityowner's

*threadandtheassociatedPCBpointerwithinthethreadisclearedbecause

*thePCBhasbeenreleased.

**Partofloadingacontextistoreleasethesavearea.Ifthesaveareacontains

*othercontext，thesaveareacannotbereleased.So，whatwe'releftwithis

*thattherewillbenonormalcontextsavearea，butonefortheas-not-yet

*restoredfacilitysavearea.Again，whenthatcontextisreloaded，thePCB

*isreleased，andwhenitisagainstored，itgoesintothe"normal"savearea.

**So，whatdowedowhenthereisnogeneralcontext，andwehavesomeFPU/VMX

*statetosave？HeckifIknow，butithappenswhenweswitchthreadswhen

*weshortcutsystemcalls.Thequestionis：doesthetargetthreadcarrythe

*FPU/VMXcontextwithitornot？Actually，itdon'tmatter，notonelittlebit.

*Ifweareaskedtosaveit，wegotta.It'sareallylousywaytodoit，but

*shortofstartingoverwithFPUs，it'swhat'swhat.Therefore，we'll

*allocateanFPUcontextsaveandattachit.

**Actually，it'snotquitethatsimple：sincewearen'tin

*ininterrupthandlercontext(that'sonlyinfpu_switch)wecan'tuse

*quickfrettomergeFPUintogeneralcontext.So，ifthereisanFPU

*savearea，weneedtousethat.Sowhatwedois：ifthereisFPUcontext

*usethat.Ifthereisageneralcontext，thenusethat.Ifneither，

*allocateasaveareaandmakethattheFPUcontext.

**Thenextthingwehavetodoistoallowthekerneltouseboththe

*floatingpointandAltivec.Itisnotrecommended，buttheremaybea

*goodreasontodoso.So，whatweneedtodoistotreateachofthe

*threetypesofcontextthesame，bykeepingaLIFOchainofstates.

*Wedohaveaproblemwiththatinthattherecanbemultiplelevelsof

*kernelcontext.Forexample，weareusingfloatingpointandwetakea

*pagefault，andsomehowstartusingtheFPU，andtakeanotherpagefault，

*etc.

**Anyway，wewillhopethatweonlyreasonablyusefloatingpointandvectorsin

*thekernel.Andtrytopackthecontextinasfewsaveareasaspossible.

**Thewaywekeepthese"levels"offloatingpointorvectorcontextstraightis

*torememberthetopofthenormalsaveareachainwhenweactivatethe

*facilitywhenitisfirstused.Then，whenwesavethatcontext，thisvalue

*issavedinitslevelfield.

**Whatthelevelconceptgivesusisawaytodistinguishbetweenmultiple

*independentcontextsunderthesamethreadactivation.Anytimewetake

*anykindofinterruption(trap，systemcall，I/Ointerruption)，weare，

*ineffect，runningwithadifferentcontexteventhoughweareinthe

*samethread.Thetopsaveareaaddressisusedonlyasamarker.Itdoesnot

*pointtoanycontextassociatedwiththefloatorvectorcontext.Forexample，

*thetopsaveareapointerwillalwaysbe0fortheusercontext，becausethere

*ititalwayslastonthelist.

**Asnormalcontextisunstacked，thefirstfacilitycontextischeckedand

*ifthereisamatch，thefacilitysaveareaisreleased.Thisisbecausewe

*arereturningtoalevelbeforethefacilitysavedtherewasused.Ineffect，

*thisallowsustounwindthefacilitycontextsaveareasatdifferentrates.

**Inconjunctionwiththecurrentactivation，thesemarkersarealsousedto

*determinethestateofthefacilityenablement.Wheneverthefacilitycontextis

*"live，"i.e.，loadedinthehardwareregistersandbelongingtothecurrently

*runningcontext，thefacilityisenabledbeforedispatch.

**Thereisnothingspecialaboutusingfloatingpointorvectorfacilities，

*nopreliminarysaving，enabling，ordisabling.Youjustusethem.Theonlyexception

*isduringcontextswitchingonanSMPsystem.Inthiscase，thecontextmust

*besavedasthereisnoguaranteethatthethreadwillresumeonthesame

*processor.Thisisnotagoodthing，notatall.

**Wheneverweswitchoutathreadwithadirtycontext，wealwaysneedtosaveit

*becauseitcanwakeuponadifferentprocessor.However，oncethecontexthas

*beensaved，wedon'tneedtosaveitagainuntilitgetsdirty，nordoweneed

*toreloaditunlesssomeoneelse'scontexthasbeenloaded.Tohandlethis

*optimization，weneed3things.Weneedtoknowwhatprocessorthesavedcontext

*waslastloadedon，whethertheloadedcontextcouldbedirty，andifwe'vealready

*savedit.

**Wheneverthefacilityisenabled，theprocessorIDissavedintheactivation.This

*willshowwhichprocessorhasdirtydata.Whenacontextswitchoccurs，thefacility

*contextsaresaved，butarestillrememberedaslive.Thenexttimeweneedto

*contextswitch，wefirstcheckifthestateislive，andifnot，donostate

*saving.Thenwecheckifthestatehasalreadybeensaveandifnot，saveit.

*Thefacilityisalwaysdisabledonacontextswitch.OnaUP，thissavefunction

*doesnotoccur.

*Wheneverafacilityunavailableinterruptionoccurs，thecurrentstateissaved

*ifitisliveandunsaved.However，ifthelivestateisthesameasthenew

*onetobeloaded，theprocessorIDischeckedandifitisthecurrentprocessor

*thestatedoesnotneedtobeloadedorsaved.Thefacilityissimplyenabled.

*Onceallocated，facilitysaveareasarenotreleaseduntilareturnismadetoa

*previouslevel.Onceafacilityhasbeenenabled，thereisnowaytotellif

*itwilleverbeusedagain，butitislikely.Therefore，discardingasavearea

*whenitscontextismadeliveisextraoverhead.So，wedon'tdoit，butwe

*domarkthesaveareacontentsasinvalid.

*/

/*

;Thefollowingistheactualwayitisimplemented.Itdoesn'tquitematch

;theabovetext.Ineedtogoandfixthat.;

;Contextdownload(operatesonowner'sdata)：;

;0)enablefacility;1)ifnoownerexittocontextrestore

;2)ifcontextprocessor！=currentprocessorexittocontextrestore;3)ifcurrentactivation==owneractivation：

;1)ifcurrlevel==activelevel：;1)iftopfacilitysaveareaexists：

;invalidatesaveareabysettinglevelto1;2)enablefacilityforuser

;3)exit;

;2)elsegoto5;

;4)ifcurrlevel==activelevel：;1)iftopfacilitysaveareaexists：

;1)iftopsavelevel==activelevelexittocontextrestore;

;5)allocatesavearea;1)ifthereisafacilitysaveanditisinvalid，selectit，andbreak

;2)scannormallistforfreefacilityarea，selectiffound，andbreak;3)scanotherfacilityforfreesave：select，iffound，andbreak

;4)allocateanewsavearea;

;6)savecontext;7)markfacilitysavewithcurrlevel

;8)ifreusingcachedsavearea(case#1)exittocontextrestore;9)setfacilitysavebackchaintofacilitytopsavearea

;10)setfacilitytoptosavearea;11)exittocontextrestore

;;

;Contextrestore/upload(operatesoncurrentactivation'sdata)：;

;1)setcurrenttoactivation;2)setactiveleveltocurrentlevel

;3)setcontextprocessortocurrentprocessor;4)ifnofacilitysaveareaortopsavelevel！=currlevel

;initializefacilityregisterstoemptyvalue;5)else

;1)loadregistersfromsavearea;2)invalidatesaveareabysettinglevelto1

;;6)enablefacilityforuser

;7)exittointerruptreturn;

;;Contextsave(operatesonspecifiedactivation'sdata)：;1)ifnoownerexit

;2)ifowner！=specifiedactivationexit;3)ifcontextprocessor！=currentprocessor

;1)clearowner;2)exit

;;4)iffacilitytopsavearealevelexistsand==activelevelexit

;5)ifcurrlevel！=activelevelexit;6)allocatesavearea

;1)ifthereisafacilitysaveanditisinvalid，selectit，andbreak;2)scannormallistforfreefacilityarea，selectiffound，andbreak

;3)scanotherfacilityforfreesave：select，iffound，andbreak;4)allocateanewsavearea

;7)savecontext;8)markfacilitysaveareawithcurrlevel

;9)ifreusingcachedsavearea(case#1)exit;10)setfacilitysavebackchaintofacilitytopsavearea

;11)setfacilitytoptosavearea;12)exit

;;

;Exceptionexit(hw_exceptions)：;

;1)disablereturnfacility;2)ifreturningsavearea！=activelevel

;1)ifowner！=currentactivationexit;2)ifcontextprocessor！=currentprocessor：

;1)clearowner;2)exit

;;3)ifnewlevel！=activelevelexit

;4)enablereturnfacility;5)exit

;;3)ifnofacilitysaveareaexit

;4)iftopsavelevel==activeortopisinvalid;1)dequeuetopfacilitysavearea

;2)setactiveleveltonewtopsavearea'slevel;3)releasesavearea

;4)ifowner==currentactivationclearowner;5)exit

;;

;;

;if(owner==activation)&&(currlevel==activelevel);&&(activationprocessor==currentprocessor)：：=contextlive

*/

ENTRY(fpu_save，TAG_NO_FRAME_USED)

mfmsrr0;GettheMSR

rlwinmr0，r0，0，MSR_FP_BIT+1，MSR_FP_BIT-1;Turnofffloatingpointforeverrlwinmr2，r0，0，MSR_EE_BIT+1，MSR_EE_BIT-1;Butdointerruptsonlyfornow

orir2，r2，MASK(MSR_FP);Enablethefloatingpointfeaturefornowalsomtmsrr2;SettheMSR

isyncmfsprgr6，0;Gettheper_processorblock

lwzr12，PP_FPU_THREAD(r6);GetthethreadthatownstheFPU#ifFPVECDBG

mrr7，r0;(TEST/DEBUG)

lir4，0;(TEST/DEBUG)mrr10，r3;(TEST/DEBUG)

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)mr.r3，r12;(TEST/DEBUG)

lir2，0x6F00;(TEST/DEBUG)lir5，0;(TEST/DEBUG)

beq-noowneryet;(TEST/DEBUG)lwzr4，ACT_MACT_FPUlvl(r12);(TEST/DEBUG)

lwzr5，ACT_MACT_FPU(r12);(TEST/DEBUG)

noowneryet：orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)mrr0，r7;(TEST/DEBUG)

mrr3，r10;(TEST/DEBUG)#endif

mflrr2;Savethereturnaddress

lhzr11，PP_CPU_NUMBER(r6);GetourCPUnumbermr.r12，r12;AnyoneowntheFPU？

cmplwcr1，r3，r12;Isthespecifiedthreadtheowner？beq-fsretnr;NobodyownstheFPU，nosaverequired...lir4，ACT_MACT_FPUcpu;PointtotheCPUindication/lockword

bne-cr1，fsretnr;Facilitybelongstosomeotheractivation...fsvSpin2：lwarxr9，r4，r12;GetandreservethelastusedCPU

mr.r9，r9;Isitchangingnow？orisr3，r9，hi16(fvChk);Setthe"changing"flag

blt-fsvSpin2;Spinifchangingstwcx.r3，r4，r12;Lockitup

bne-fsvSpin2;Someoneismessingrightnow

isync;Makesureweseeeverythingcmplwcr1，r9，r11;Wasthecontextforthisprocessor？

lir3，0;Assumeweneedafix-me-upbeq-cr1，fsgoodcpu;Facilitylastusedonthisprocessor...

stwr3，PP_FPU_THREAD(r6);Clearownerbecauseitwasreallyontheotherprocessorbfsret;Bailnowwithnosave...fsgoodcpu：lwzr3，ACT_MACT_FPU(r12);GetthecurrentFPUsaveareaforthethread

lwzr9，ACT_MACT_FPUlvl(r12);Getourcurrentlevelindicatorcmplwicr1，r3，0;Haveweeversavedthisfacilitycontext？

beq-cr1，fsneedone;Neversavedit，soweneedanarea...lwzr8，SAVlvlfp(r3);Getthelevelthissaveareaisfor

cmplwir8，1;Seeifitisasparecmplwcr1，r9，r8;Correctlevel？

beq+fsusespare;Wehaveasparetouse...beq-cr1，fsret;Thecurrentlevelisalreadysaved，bailout...fsneedone：lir3，0;Telltheroutinetoallocateanareaifnonefound

blfpsrchsave;Findafreesaveareamfsprgr6，0;Getbackper_processorblock

orisr7，r7，hi16(SAVfpuvalid);Settheallocatedbitlwzr12，PP_FPU_THREAD(r6);Getbackourthread

mtlrr2;Restorereturnlwzr8，ACT_MACT_FPU(r12);Getthecurrenttopfloatingpointsavearea

lwzr9，ACT_MACT_FPUlvl(r12);Getourcurrentlevelindicatoragainstwr3，ACT_MACT_FPU(r12);SetthisasthelatestFPUsaveareaforthethread

stwr8，SAVprefp(r3);Andthenchainthisinfrontstwr7，SAVflags(r3);Setthevalidityflags

stwr12，SAVact(r3);Makesurewepointtotherightguy

fsusespare：stwr9，SAVlvlfp(r3);Andsetthelevelthissaveareaisfor;

;SavethecurrentFPUstateintothePCBofthethreadthatownsit.;lar11，savefp0(r3);Pointtothe1stline

dcbz0，r11;Allocatethefirstsavearealinelar11，savefp4(r3)/*Pointtothe2ndline*/

stfdf0，savefp0(r3)

dcbz0，r11/*allocateit*/

stfdf1，savefp1(r3)

stfdf2，savefp2(r3)

lar11，savefp8(r3)/*Pointtothe3rdline*/

stfdf3，savefp3(r3)

dcbz0，r11/*allocateit*/

stfdf4，savefp4(r3)

stfdf5，savefp5(r3)

stfdf6，savefp6(r3)

lar11，savefp12(r3)/*Pointtothe4thline*/

stfdf7，savefp7(r3)

dcbz0，r11/*allocateit*/

stfdf8，savefp8(r3)

stfdf9，savefp9(r3)

stfdf10，savefp10(r3)

lar11，savefp16(r3)/*Pointtothe5thline*/

stfdf11，savefp11(r3)

dcbz0，r11/*allocateit*/

stfdf12，savefp12(r3)

stfdf13，savefp13(r3)

stfdf14，savefp14(r3)

lar11，savefp20(r3)/*Pointtothe6thline*/

stfdf15，savefp15(r3)

stfdf16，savefp16(r3)

stfdf17，savefp17(r3)

stfdf18，savefp18(r3)

lar11，savefp24(r3)/*Pointtothe7thline*/

stfdf19，savefp19(r3)

dcbz0，r11/*allocateit*/

stfdf20，savefp20(r3)

lwzr10，liveFPSCR(r6);GetthepreviouslysavedFPSCR

stfdf21，savefp21(r3)stfdf22，savefp22(r3)

lir9，0;Justclearthisout

lar11，savefp28(r3)/*Pointtothe8thline*/stfdf23，savefp23(r3)

dcbz0，r11/*allocateit*/

stfdf24，savefp24(r3)

stfdf25，savefp25(r3)

stfdf26，savefp26(r3)

stfdf27，savefp27(r3)

stfdf28，savefp28(r3)

;NotethatwejustsavetheFPSCRhereforease.Itisreallyalreadysaved

;inthe"normal"contextareaofthesavearea.

stwr9，savefpscrpad(r3);SavetheFPSCRpad

stwr10，savefpscr(r3);SavetheFPSCRstfdf29，savefp29(r3)

stfdf30，savefp30(r3)

stfdf31，savefp31(r3)

lfdf0，savefp0(r3);WeneedtorestoreF0becauseweusedit

;togettheFPSCR#if0

lar9，savefp0(r3);(TEST/DEBUG)

lar10，savefp31(r3);(TEST/DEBUG)chkkillmedead：

lhar8，0(r9);(TEST/DEBUG)

addir9，r9，8;(TEST/DEBUG)cmpwir8，-8;(TEST/DEBUG)

cmplwcr1，r9，r10;(TEST/DEBUG)bne+dontkillmedead;(TEST/DEBUG)

BREAKPOINT_TRAP;(TEST/DEBUG)

dontkillmedead：;(TEST/DEBUG)

ble+cr1，chkkillmedead;(TEST/DEBUG)#endif

fsret：lwzr4，ACT_MACT_FPUcpu(r12);GetbacktheownerCPU

rlwinmr4，r4，0，fvChkb+1，31;Clearlocksyncstwr4，ACT_MACT_FPUcpu(r12);Unlockthecontextfsretnr：mtmsrr0;Putinterruptsoniftheywereandfloatingpointoff

isync

blr

/*

*fpu_switch()

**Enteredtohandlethefloating-pointunavailableexceptionand

*switchfpucontext

**Thiscodeisruninvirtualaddressmodeonwithinterruptsoff.

**Uponexit，thecodereturnstotheuserscontextwiththefloating

*pointfacilityturnedon.

**ENTRY：VMswitchedON

*InterruptsOFF

*StateissavedinsaveareapointedtobyR4.

*Allotherregistersarefree.

*/

ENTRY(fpu_switch，TAG_NO_FRAME_USED)

#ifDEBUG

#ifGDDBG

mrr7，r4;Saveinputparameter

lisr3，hi16(EXT(fpu_trap_count));GetaddressofFPtrapcounterorir3，r3，lo16(EXT(fpu_trap_count));GetaddressofFPtrapcounter

lwzr1，0(r3)lisr5，hi16(EXT(GratefulDeb));Pointtotopofdisplay

orir5，r5，lo16(EXT(GratefulDeb));Putinbottompartaddir1，r1，1

mtlrr5;Setlinkregister

stwr1，0(r3)mrr4，r1

lir3，0

blrl;Displaycount

mrr4，r7;Restoretheparameter#else

lisr3，hi16(EXT(fpu_trap_count));GetaddressofFPtrapcounter

orir3，r3，lo16(EXT(fpu_trap_count));GetaddressofFPtrapcounterlwzr1，0(r3)

addir1，r1，1

stwr1，0(r3)

#endif

#endif/*DEBUG*/

mfsprgr6，0;Gettheper_processorblock

mfmsrr19;GetthecurrentMSRlwzr10，PP_CPU_DATA(r6);GettheCPUdatapointer

lwzr12，PP_FPU_THREAD(r6);GetthethreadthatownstheFPUlwzr10，CPU_ACTIVE_THREAD(r10);Getthepointertotheactivethread

orir19，r19，lo16(MASK(MSR_FP));Enablethefloatingpointfeaturelwzr17，THREAD_TOP_ACT(r10);Nowgettheactivationthatisrunning;R12hasthe"old"activation

;R17hasthe"new"activation

#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F01;(TEST/DEBUG)mrr3，r12;(TEST/DEBUG)

mrr5，r17;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#endif

mr.r12，r12;SeeifthereisanyliveFPstatuslhzr18，PP_CPU_NUMBER(r6);GetthecurrentCPU，wewillneeditlatermtmsrr19;Enablefloatingpointinstructions

isyncbeq-fsnosave;Nolivecontext，sonothingtosave...lir20，ACT_MACT_FPUcpu;PointtotheCPUindication/lockwordfsSpin1：lwarxr19，r20，r12;GetandreservethelastusedCPU

mr.r19，r19;Isitchangingnow？orisr21，r19，hi16(fvChk);Setthe"changing"flag

blt-fsSpin1;Spinifchangingstwcx.r21，r20，r12;Lockitup

bne-fsSpin1;Someoneismessingrightnow

isync;Makesureweseeeverythinglwzr15，ACT_MACT_PCB(r12);Getthecurrentlevelofthe"old"one

cmplwr18，r19;ChecktheCPUthattheoldcontextisliveonlwzr14，ACT_MACT_FPU(r12);Pointtothetopoftheoldcontextstack

bne-fsnosaverel;ContextisnotliveifusedonadifferentCPU...lwzr13，ACT_MACT_FPUlvl(r12);Getthe"old"activelevel;

;First，checktoseeifallwearedoingisenablingbecausethe;"new"contextislive.

;#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F02;(TEST/DEBUG)mrr1，r15;(TEST/DEBUG)

mrr3，r13;(TEST/DEBUG)mrr5，r14;(TEST/DEBUG)

orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)sc;(TEST/DEBUG)

#endif

cmplwcr1，r12，r17;Arethe"old"activationandthe"new"thesame？

cmplwicr2，r14，0;Isthereanysavedcontextonthe"old"activation？bne+cr1，fsmstsave;Theactivationsaredifferentso"old"contextmustbesaved...;

;Hereweknowthatboththe"old"and"new"activationsarethesame.Wewill;checkthecurrentlevelandactivelevels.Iftheyarethesame，thecontextis

;alreadylive，soallwedoisturnonthefacilityandinvalidatethetop;savearea.

;;Ifthecurrentlevel，theactivelevel，andthetopsavearealevelarethe

;same，thenthecontextwassavedaspartofathreadcontextswitchandneither;needssavingorrestoration.

;;Inallothercases，thecontextmustbesavedunlesswearejustre-enabling

;floatingpoint.;cmplwr13，r15;Arethelevelsthesame？

cmplwicr2，r14，0;Isthereanysavedcontext？bne-fsmstsave;Levelsaredifferent，weneedtosave...beq-cr2，fsenableret;Nosavedcontextatall，enableandgo...lwzr20，SAVlvlfp(r14);Getthelevelofthetopsavearea#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F03;(TEST/DEBUG)mrr3，r15;(TEST/DEBUG)

mrr5，r20;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#endif

cmplwr15，r20;Isthetoplevelthesameasthecurrent？

lir0，1;Gettheinvalidflagbne-fsenableret;Notthesame，justenableandgo...stwr0，SAVlvlfp(r14);Invalidatethattopsavearea

fsenableret：sync;Makesureeverythingissaved

stwr19，ACT_MACT_FPUcpu(r12);Saywearenotusingthecontextanymore

bfsenable;Thenenableandgo...;

;Weneedtosavethe"old"contexthere.TheLIFOqueueingschemeworks;outforallcasesbecauseifboththe"new"and"old"activationsarethe

;same，therecannotbeanysavedstatetoload.the"new"levelis;truelynew.

;;Whenwesavethecontext，weeitheruseanewsavearea，orthefree

;onethatiscachedattheheadofthelist.fsmstsave：beq-cr2，fsgetsave;Thereisnopossiblecachedsavearealwzr5，SAVlvlfp(r14);Gettheleveloffirstfacilitysavearea

#ifFPVECDBGlisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F04;(TEST/DEBUG)mrr3，r15;(TEST/DEBUG)

orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)sc;(TEST/DEBUG)

#endifmrr3，r14;Assumeweareinvalid

cmplwir5，1;Isitinvalid？cmplwcr1，r5，r13;IstheSAleveltheactiveone？

beq+fsusecache;Invalid，justuseit...beq-cr1，fsnosaverel;TheSAlevelisactive，itisalreadysaved...fsgetsave：mrr3，r4;Usetheinterruptsaveasthecontextsaveareaifnonecached

#ifFPVECDBGlisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F05;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#endif

blfpsrchsave;Findafreesaveareastwr3，ACT_MACT_FPU(r12);Setthisasthelatestcontextsaveareaforthethread

mfsprgr6，0;Getbackper_processorblockstwr14，SAVprefp(r3);Andthenchainthisinfront

orisr7，r7，hi16(SAVfpuvalid);Settheallocatedbitstwr12，SAVact(r3);Makesurewepointtotherightguy

stwr7，SAVflags(r3);Settheallocationflags

fsusecache：lar11，savefp0(r3);Pointtothe1stlineinarea

stwr13，SAVlvlfp(r3);Setthiscontextlevel#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F06;(TEST/DEBUG)mrr5，r13;(TEST/DEBUG)

orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)sc;(TEST/DEBUG)

#endif

;Nowwewillactuallysavetheoldcontext;dcbz0，r11;Allocatetheoutputarealar11，savefp4(r3);Pointtothe2ndline

stfdf0，savefp0(r3)dcbz0，r11;Allocatecache

stfdf1，savefp1(r3)stfdf2，savefp2(r3)

lar11，savefp8(r3);Pointtothe3rdline

stfdf3，savefp3(r3)dcbz0，r11;Allocatecache

stfdf4，savefp4(r3)stfdf5，savefp5(r3)

stfdf6，savefp6(r3)

lar11，savefp12(r3);Pointtothe4thline

stfdf7，savefp7(r3)dcbz0，r11;Allocatecache

stfdf8，savefp8(r3)stfdf9，savefp9(r3)

stfdf10，savefp10(r3)

lar11，savefp16(r3);Pointtothe5thline

stfdf11，savefp11(r3)dcbz0，r11;Allocatecache

stfdf12，savefp12(r3)stfdf13，savefp13(r3)

stfdf14，savefp14(r3)

lar11，savefp20(r3);Pointtothe6thline

stfdf15，savefp15(r3)dcbz0，r11;Allocatecache

stfdf16，savefp16(r3)stfdf17，savefp17(r3)

stfdf18，savefp18(r3)

lar11，savefp24(r3);Pointtothe7thline

stfdf19，savefp19(r3)dcbz0，r11;Allocatecache

stfdf20，savefp20(r3)

lir14，0;Clearthisfornow

lwzr15，liveFPSCR(r6);GetthepreviouslysavedFPSCR

stfdf21，savefp21(r3)

stfdf22，savefp22(r3)

lar11，savefp28(r3);Pointtothe8thline

stfdf23，savefp23(r3)dcbz0，r11;allocateit

stfdf24，savefp24(r3)stfdf25，savefp25(r3)

stfdf26，savefp26(r3)

lar11，savefpscrpad(r3);Pointtothe9thline

stfdf27，savefp27(r3)dcbz0，r11;allocateit

stfdf28，savefp28(r3)stfdf29，savefp29(r3)

stfdf30，savefp30(r3)

stfdf31，savefp31(r3)

;NotethatwejustsavetheFPSCRhereforease.Itisreallyalreadysaved

;inthe"normal"contextareaofthesavearea.

stwr14，savefpscrpad(r3);SavetheFPSCRpad

stwr15，savefpscr(r3);SavetheFPSCR

;Thecontextisallsavednowandthefacilityisfree.;

;Nowcheckoutthe"new"andseeifweneedtoloaduphiscontext.;Ifwedo(andthisshouldbethenormalcase)，doitandtheninvalidatethe

;savearea.(Thiswillkeepitcachedforquickaccessnexttimearound.);

;Ifwedonot(remember，wealreadytookcareofthecasewherewejustenable;theFPU)，weneedtofilltheregisterswithjunk，becausethislevelhas

;neverusedthembeforeandsomethievingbastardcouldhacktheoldvalues;ofsomethread！Justimaginewhatwouldhappeniftheycould！Why，nothing

;wouldbesafe！MyGod！Itisterrifying！;

fsnosaverel：

sync;Makesureeverythingissaved

stwr19，ACT_MACT_FPUcpu(r12);Saywearenotusingthecontextanymorefsnosave：

lir20，ACT_MACT_FPUcpu;PointtotheCPUindication/lockwordfsSpin2：lwarxr19，r20，r17;GetandreservethelastusedCPU

mr.r19，r19;Isitchangingnow？orisr21，r19，hi16(fvChk);Setthe"changing"flag

blt-fsSpin2;Spinifchangingstwcx.r21，r20，r17;Lockitup

bne-fsSpin2;Someoneismessingrightnow

isync;Makesureweseeeverythinglwzr15，ACT_MACT_PCB(r17);Getthecurrentlevelofthe"new"one

lwzr14，ACT_MACT_FPU(r17);Pointtothetopofthe"new"contextstacklwzr13，ACT_MACT_FPUlvl(r17);Getthe"new"activelevel

#ifFPVECDBGlisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F07;(TEST/DEBUG)mrr1，r15;(TEST/DEBUG)

mrr3，r14;(TEST/DEBUG)mrr5，r13;(TEST/DEBUG)

orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)sc;(TEST/DEBUG)

#endif

cmplwicr1，r14，0;Dowepossiblyhavesomecontexttoload？

stwr15，ACT_MACT_FPUlvl(r17);Setthe"new"activelevellar11，savefp0(r14);Pointtofirstlinetobringin

stwr17，PP_FPU_THREAD(r6);Storecurrentthreadaddressinfpu_threadtoclaimfpuforthreadbeq+cr1，MakeSureThatNoTerroristsCanHurtUsByGod;No"new"contexttoload...

lwzr0，SAVlvlfp(r14);Gettheleveloffirstfacilitysaveareacmplwr0，r15;Toplevelcorrecttoload？

bne-MakeSureThatNoTerroristsCanHurtUsByGod;No，goinitialize...#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F08;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#endif

dcbt0，r11;Touchlinein

lir0，1;Getthelevelinvalidindicationlar11，savefp4(r14);Pointtonextline

dcbt0，r11;Touchlineinlfdf0，savefp0(r14)

lfdf1，savefp1(r14)

stwr0，SAVlvlfp(r14);Markthesaveareainvalidbecauseweareactivatingagain

lfdf2，savefp2(r14)lar11，savefp8(r14);Pointtonextline

lfdf3，savefp3(r14)dcbt0，r11;Touchlinein

lfdf4，savefp4(r14)lfdf5，savefp5(r14)

lfdf6，savefp6(r14)

lar11，savefp12(r14);Pointtonextline

lfdf7，savefp7(r14)dcbt0，r11;Touchlinein

lfdf8，savefp8(r14)lfdf9，savefp9(r14)

lfdf10，savefp10(r14)

lar11，savefp16(r14);Pointtonextline

lfdf11，savefp11(r14)dcbt0，r11;Touchlinein

lfdf12，savefp12(r14)lfdf13，savefp13(r14)

lfdf14，savefp14(r14)

lar11，savefp20(r14);Pointtonextline

lfdf15，savefp15(r14)dcbt0，r11;Touchlinein

lfdf16，savefp16(r14)lfdf17，savefp17(r14)

lfdf18，savefp18(r14)

lar11，savefp24(r14);Pointtonextline

lfdf19，savefp19(r14)dcbt0，r11;Touchlinein

lfdf20，savefp20(r14)lfdf21，savefp21(r14)

lar11，savefp28(r14);Pointtonextline

lfdf22，savefp22(r14)lfdf23，savefp23(r14)

dcbt0，r11;Touchlinein

lfdf24，savefp24(r14)lfdf25，savefp25(r14)

lfdf26，savefp26(r14)

lfdf27，savefp27(r14)

lfdf28，savefp28(r14)

lfdf29，savefp29(r14)

lfdf30，savefp30(r14)

lfdf31，savefp31(r14)

fsenablexx：sync;Makesureallissaved

stwr18，ACT_MACT_FPUcpu(r17);SettheactiveCPUandrelease

fsenable：lwzr9，SAVflags(r4)/*Gettheflagsofthecurrentsavearea*/

lwzr8，savesrr1(r4);Getthemsroftheinterruptedguy

rlwinmr5，r4，0，0，19/*Getthepageaddressofthesavearea*/orir8，r8，MASK(MSR_FP);Enablethefloatingpointfeature

lwzr10，ACT_MACT_SPF(r17);Getthespecialflagslisr7，hi16(SAVattach)/*Gettheattachedflag*/

lwzr5，SACvrswap(r5)/*GetVirtualtoRealtranslation*/

orisr10，r10，hi16(floatUsed|floatCng);Setthatweusedfloatingpoint

mr.r15，r15;Seeifwearedoingthisforuserstatestwr8，savesrr1(r4);Setthemsroftheinterruptedguy

andcr9，r9，r7/*Cleartheattachedbit*/xorr3，r4，r5/*Gettherealaddressofthesavearea*/

bne-fsnuser;Wearenotuserstate...

stwr10，ACT_MACT_SPF(r17);Settheactivationcopystwr10，spcFlags(r6);Setper_proccopyfsnuser：

#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F0A;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#endif

stwr9，SAVflags(r4)/*Settheflagsofthecurrentsavearea*/

bEXT(exception_exit)/*Exitfromthefray...*/

/*

*Initializetheregisterstosomebogusvalue

*/

MakeSureThatNoTerroristsCanHurtUsByGod：

#if0

lwzr10，savesrr1(r4);(TEST/DEBUG)

rlwinm.r10，r10，0，MSR_PR_BIT，MSR_PR_BIT;(TEST/DEBUG)beq-nxxxxxx;(TEST/DEBUG)

lwzr10，ACT_MACT_SPF(r17);(TEST/DEBUG)rlwinm.r10，r10，0，1，1;(TEST/DEBUG)

beq+nxxxxxxBREAKPOINT_TRAP;(TEST/DEBUG)

nxxxxxx：#endif

#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x7F09;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#endif

lisr5，hi16(EXT(FloatInit))/*Gettopsecretfloatingpointinitvalueaddress*/

orir5，r5，lo16(EXT(FloatInit))/*Slambottom*/

lfdf0，0(r5)/*InitializeFP0*/

fmrf1，f0;Dothemall

fmrf2，f0fmrf3，f0

fmrf4，f0

fmrf5，f0

fmrf6，f0

fmrf7，f0

fmrf8，f0

fmrf9，f0

fmrf10，f0

fmrf11，f0

fmrf12，f0

fmrf13，f0

fmrf14，f0

fmrf15，f0

fmrf16，f0

fmrf17，f0

fsubf31，f31，f31;GetsettoinitializetheFPSCR

fmrf18，f0fmrf19，f0

fmrf20，f0

mtfsf0xff，f31;ClearallFPSCRexceptioneanbles

fmrf21，f0fmrf22，f0

fmrf23，f0

fmrf24，f0

fmrf25，f0

fmrf26，f0

fmrf27，f0

fmrf28，f0

fmrf29，f0

fmrf30，f0

fmrf31，f0

bfsenablexx;Finishsettingitallup...;

;Findsanunusedfloatingpointareaintheactivationpointed;tobyR12ssavedcontexts.Ifnonearefound(unlikelybutpossible)

;andR3is0，anewareaisallocated.IfR3isnon-zero，itcontains;apointertoanfloatingpointsaveareathatisfree.

;fpsrchsave：

lwzr6，ACT_MACT_PCB(r12);Getthefirst"normal"saveareafpsrnorm：mr.r5，r6;Isthereanother？

beq-fpsrvect;No，searchthevectorsaveareas...lwzr7，SAVflags(r5);Gettheflagsforthisguy

lwzr6，SAVprev(r5);Gettheprevioussavearea，justincaseandis.r8，r7，hi16(SAVfpuvalid);HavewefoundanemptyFPUsaveinnormal？

beq+fpsrgot;Wefoundone...bfpsrnorm;Searchagain...fpsrvect：lwzr6，ACT_MACT_VMX(r12);Getthefirst"vector"saveareafpsrvectx：mr.r5，r6;Isthereanother？

beq-fpsrget;No，trytoallocateone...lwzr7，SAVflags(r5);Gettheflagsforthisguy

lwzr6，SAVprevec(r5);Gettheprevioussavearea，justincaseandis.r8，r7，hi16(SAVfpuvalid);HavewefoundanemptyFPUsaveinvector？

bne-fpsrvectx;Searchagain...fpsrgot：mrr3，r5;Getthesaveareaintotherightregister

blr;Return...

fpsrget：mr.r5，r3;Doweallocateoruseexisting？

beq+fpsrallo;Allocateone...lwzr7，SAVflags(r3);Getthepassedinareaflags

blr;Return...;

;NOTE：save_getwillreturndirectlyandsetR7to0...;

fpsrallo：bEXT(save_get);Getafreshsavearea

/*

*Altivecstuffishere.Thetechniquesusedareprettyidenticalto

*thefloatingpoint.ExceptthatwewillhonortheVRSAVEregister

*settingswhenloadingandrestoringregisters.

**TherearetwoindicationsofsavedVRs：theVRSAVEregisterandthevrvalid

*mask.VRSAVEissetbythevectoruserandrepresentstheVRsthatthey

*saythattheyareusing.Thevrvalidmaskindicateswhichvectorregisters

*aresavedinthesavearea.Whenevercontextissaved，itissavedaccording

*totheVRSAVEregister.ItisloadedbasedonVRSAVEandedwith

*vrvalid(allotherregistersaresplattedwith0s).Thisisdonebecausewe

*don'twanttoloadanyregisterswedon'thaveacopyof，wewanttosetthem

*tozeroinstead.

**/

ENTRY(vec_save，TAG_NO_FRAME_USED)

mfmsrr0;GettheMSR

rlwinmr0，r0，0，MSR_VEC_BIT+1，MSR_VEC_BIT-1;Turnoffvectorforeverrlwinmr2，r0，0，MSR_EE_BIT+1，MSR_EE_BIT-1;Butdointerruptsonlyfornow

orisr2，r2，hi16(MASK(MSR_VEC));Enablethevectorfacilityfornowalsomtmsrr2;SettheMSR

isyncmfsprgr6，0;Gettheper_processorblock

lwzr12，PP_VMX_THREAD(r6);Getthethreadthatownsthevector#ifFPVECDBG

mrr7，r0;(TEST/DEBUG)

lir4，0;(TEST/DEBUG)mrr10，r3;(TEST/DEBUG)

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)mr.r3，r12;(TEST/DEBUG)

lir2，0x5F00;(TEST/DEBUG)lir5，0;(TEST/DEBUG)

beq-noowneryeu;(TEST/DEBUG)lwzr4，ACT_MACT_VMXlvl(r12);(TEST/DEBUG)

lwzr5，ACT_MACT_VMX(r12);(TEST/DEBUG)

noowneryeu：orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)mrr0，r7;(TEST/DEBUG)

mrr3，r10;(TEST/DEBUG)#endif

mflrr2;Savethereturnaddress

lhzr11，PP_CPU_NUMBER(r6);GetourCPUnumbermr.r12，r12;Anyoneownthevector？

cmplwcr1，r3，r12;Isthespecifiedthreadtheowner？beq-vsretnr;Nobodyownsthevector，nosaverequired...lir4，ACT_MACT_VMXcpu;PointtotheCPUindication/lockword

bne-cr1，vsretnr;Facilitybelongstosomeotheractivation...vsvSpin2：lwarxr9，r4，r12;GetandreservethelastusedCPU

mr.r9，r9;Isitchangingnow？orisr3，r9，hi16(fvChk);Setthe"changing"flag

blt-vsvSpin2;Spinifchangingstwcx.r3，r4，r12;Lockitup

bne-vsvSpin2;Someoneismessingrightnow

isync;Makesureweseeeverythingcmplwcr1，r9，r11;Wasthecontextforthisprocessor？

lir3，0;Assumeweneedafix-me-upbeq-cr1，vsgoodcpu;Facilitylastusedonthisprocessor...

stwr3，PP_VMX_THREAD(r6);Clearownerbecauseitwasreallyontheotherprocessorbvsret;Bailnowwithnosave...vsgoodcpu：lwzr3，ACT_MACT_VMX(r12);Getthecurrentvectorsaveareaforthethread

lwzr9，ACT_MACT_VMXlvl(r12);Getourcurrentlevelindicatorcmplwicr1，r3，0;Haveweeversavedthisfacilitycontext？

beq-cr1，vsneedone;Neversavedit，soweneedanarea...lwzr8，SAVlvlvec(r3);Getthelevelthissaveareaisfor

cmplwir8，1;Seeifthisisasparecmplwcr1，r9，r8;Correctlevel？

beq+vsusespare;Itisstilllive...beq-cr1，vsret;Thecurrentlevelisalreadysaved，bailout...vsneedone：lir3，0;Telltheroutinetoallocateanareaifnonefound

blvsrchsave;Findafreesaveareamfsprgr6，0;Getbackper_processorblock

orisr7，r7，hi16(SAVvmxvalid);Settheallocatedbitlwzr12，PP_VMX_THREAD(r6);Getbackourthread

mtlrr2;Restorereturnlwzr8，ACT_MACT_VMX(r12);Getthecurrenttopvectorsavearea

lwzr9，ACT_MACT_VMXlvl(r12);Getourcurrentlevelindicatoragainstwr3，ACT_MACT_VMX(r12);Setthisasthelatestvectorsaveareaforthethread

stwr8，SAVprevec(r3);Andthenchainthisinfrontstwr7，SAVflags(r3);Settheallocationflags

stwr12，SAVact(r3);Makesurewepointtotherightguy

vsusespare：stwr9，SAVlvlvec(r3);Andsetthelevelthissaveareaisfor

mfcrr2;Savenon-volatileCRslwzr10，liveVRS(r6);GettherightVRSaveregister

lisr9，0x5555;Maskwithoddbitssetrlwinmr11，r10，1，0，31;Shiftover1

orir9，r9，0x5555;Finishmaskorr4，r10，r11;Afterthis，evenbitsshowwhichlinestozapandcr11，r4，r9;Clearoutoddbitslar6，savevr0(r3);Pointtoline0

rlwinmr4，r11，15，0，15;Moveline8-15flagstohighorderoddbitslar9，savevrvalid(r3);Pointtothesavedregistermaskfield

orr4，r11，r4;Settheoddbits;(bit0isline0，bit1isline8，

;bit2isline1，bit3isline9，etc.dcbabr0，r9;Allocatethecacheforit

rlwimir4，r10，16，16，31;Putvrsave0-15intopositions16-31lar7，savevr2(r3);Pointtoline1

mtcrf255，r4;LoaduptheCRsstwr10，savevrvalid(r3);Savethevalidityinformation

mrr8，r6;Startregistersoff;

;Savethecurrentvectorstate;bf0，snol0;Noline0todo...

dcbabr0，r6;Allocatecacheline0snol0：

lar6，savevr4(r3);Pointtoline2

bf2，snol1;Noline1todo...dcbabr0，r7;Allocatecacheline1snol1：

lar7，savevr6(r3);Pointtoline3

bf4，snol2;Noline2todo...dcbabr0，r6;Allocatecacheline2snol2：

lir11，16;Getoffsetforoddregisters

bf16，snovr0;DonotsaveVR0...stvxlv0，br0，r8;SaveVR0snovr0：

lar9，savevr2(r3);PointtoV2/V3pair

bf17，snovr1;DonotsaveVR1...stvxlv1，r11，r8;SaveVR1snovr1：

lar6，savevr8(r3);Pointtoline4

bf6，snol3;Noline3todo...dcbabr0，r7;Allocatecacheline3snol3：

lar8，savevr4(r3);PointtoV4/V5pair

bf18，snovr2;DonotsaveVR2...stvxlv2，br0，r9;SaveVR2snovr2：

bf19，snovr3;DonotsaveVR3...

stvxlv3，r11，r9;SaveVR3snovr3：

;Note：CR4isnowfree;

lar7，savevr10(r3);Pointtoline5bf8，snol4;Noline4todo...

dcbabr0，r6;Allocatecacheline4snol4：

lar9，savevr6(r3);PointtoR6/R7pair

bf20，snovr4;DonotsaveVR4...stvxlv4，br0，r8;SaveVR4snovr4：

bf21，snovr5;DonotsaveVR5...

stvxlv5，r11，r8;SaveVR5snovr5：

mtcrf0x08，r10;SetCRsforregisters16-19

lar6，savevr12(r3);Pointtoline6bf10，snol5;Noline5todo...

dcbabr0，r7;Allocatecacheline5snol5：

lar8，savevr8(r3);PointtoV8/V9pair

bf22，snovr6;DonotsaveVR6...stvxlv6，br0，r9;SaveVR6snovr6：

bf23，snovr7;DonotsaveVR7...

stvxlv7，r11，r9;SaveVR7snovr7：

;Note：CR5isnowfree;

lar7，savevr14(r3);Pointtoline7bf12，snol6;Noline6todo...

dcbabr0，r6;Allocatecacheline6snol6：

lar9，savevr10(r3);PointtoV10/V11pair

bf24，snovr8;DonotsaveVR8...stvxlv8，br0，r8;SaveVR8snovr8：

bf25，snovr9;DonotsaveVR9...

stvxlv9，r11，r8;SaveVR9snovr9：

mtcrf0x04，r10;SetCRsforregisters20-23

lar6，savevr16(r3);Pointtoline8bf14，snol7;Noline7todo...

dcbabr0，r7;Allocatecacheline7snol7：

lar8，savevr12(r3);PointtoV12/V13pair

bf26，snovr10;DonotsaveVR10...stvxlv10，br0，r9;SaveVR10snovr10：

bf27，snovr11;DonotsaveVR11...

stvxlv11，r11，r9;SaveVR11snovr11：

;Note：CR6isnowfree;

lar7，savevr18(r3);Pointtoline9bf1，snol8;Noline8todo...

dcbabr0，r6;Allocatecacheline8snol8：

lar9，savevr14(r3);PointtoV14/V15pair

bf28，snovr12;DonotsaveVR12...stvxlv12，br0，r8;SaveVR12snovr12：

bf29，snovr13;DonotsaveVR13...

stvxlv13，r11，r8;SaveVR13snovr13：

mtcrf0x02，r10;SetCRsforregisters24-27

lar6，savevr20(r3);Pointtoline10bf3，snol9;Noline9todo...

dcbabr0，r7;Allocatecacheline9snol9：

lar8，savevr16(r3);PointtoV16/V17pair

bf30，snovr14;DonotsaveVR14...stvxlv14，br0，r9;SaveVR14snovr14：

bf31，snovr15;DonotsaveVR15...

stvxlv15，r11，r9;SaveVR15snovr15：

;Note：CR7isnowfree;

lar7，savevr22(r3);Pointtoline11bf5，snol10;Noline10todo...

dcbabr0，r6;Allocatecacheline10snol10：

lar9，savevr18(r3);PointtoV18/V19pair

bf16，snovr16;DonotsaveVR16...stvxlv16，br0，r8;SaveVR16snovr16：

bf17，snovr17;DonotsaveVR17...

stvxlv17，r11，r8;SaveVR17snovr17：

mtcrf0x01，r10;SetCRsforregisters28-31

;;Note：AllregistershavebeenorareaccountedforinCRs

;lar6，savevr24(r3);Pointtoline12

bf7，snol11;Noline11todo...dcbabr0，r7;Allocatecacheline11snol11：

lar8，savevr20(r3);PointtoV20/V21pair

bf18，snovr18;DonotsaveVR18...stvxlv18，br0，r9;SaveVR18snovr18：

bf19，snovr19;DonotsaveVR19...

stvxlv19，r11，r9;SaveVR19snovr19：

lar7，savevr26(r3);Pointtoline13

bf9，snol12;Noline12todo...dcbabr0，r6;Allocatecacheline12snol12：

lar9，savevr22(r3);PointtoV22/V23pair

bf20，snovr20;DonotsaveVR20...stvxlv20，br0，r8;SaveVR20snovr20：

bf21，snovr21;DonotsaveVR21...

stvxlv21，r11，r8;SaveVR21snovr21：

lar6，savevr28(r3);Pointtoline14

bf11，snol13;Noline13todo...dcbabr0，r7;Allocatecacheline13snol13：

lar8，savevr24(r3);PointtoV24/V25pair

bf22，snovr22;DonotsaveVR22...stvxlv22，br0，r9;SaveVR22snovr22：

bf23，snovr23;DonotsaveVR23...

stvxlv23，r11，r9;SaveVR23snovr23：

lar7，savevr30(r3);Pointtoline15

bf13，snol14;Noline14todo...dcbabr0，r6;Allocatecacheline14snol14：

lar9，savevr26(r3);PointtoV26/V27pair

bf24，snovr24;DonotsaveVR24...stvxlv24，br0，r8;SaveVR24snovr24：

bf25，snovr25;DonotsaveVR25...

stvxlv25，r11，r8;SaveVR25snovr25：

bf15，snol15;Noline15todo...

dcbabr0，r7;Allocatecacheline15snol15：

;Note：Allcachelinesallocatednow;

lar8，savevr28(r3);PointtoV28/V29pairbf26，snovr26;DonotsaveVR26...

stvxlv26，br0，r9;SaveVR26

snovr26：

bf27，snovr27;DonotsaveVR27...

stvxlv27，r11，r9;SaveVR27snovr27：

lar7，savevr30(r3);PointtoV30/V31pair

bf28，snovr28;DonotsaveVR28...stvxlv28，br0，r8;SaveVR28snovr28：

bf29，snovr29;DonotsaveVR29...

stvxlv29，r11，r8;SaveVR29snovr29：

mfvscrv27;GettheVSCR

lar8，savevscr(r3);PointtotheVSCRsaveareabf30，snovr30;DonotsaveVR30...

stvxlv30，br0，r7;SaveVR30snovr30：

dcbabr0，r8;AllocateVSCRsavearea

bf31，snovr31;DonotsaveVR31...stvxlv31，r11，r7;SaveVR31snovr31：

addr11，r11，r9;PointtoV27ssavedvalue

stvxlv27，br0，r8;SavetheVSCRbt27，v27ok;V27hasbeensavedandismarkedaswantedlisr11，hi16(EXT(QNaNbarbarian));V27isnotwanted，sogetemptyvalue

orir11，r11，lo16(EXT(QNaNbarbarian))

v27ok：mtcrf255，r2;Restoreallnon-volatileCRs

lvxlv27，br0，r11;RestoreorloademptyvalueintoV27becauseweusedit

;Savethecurrentvectorstateintothesaveareaofthethreadthatownsit.;vsret：lwzr4，ACT_MACT_VMXcpu(r12);GetbacktheownerCPU

rlwinmr4，r4，0，fvChkb+1，31;Clearlocksyncstwr4，ACT_MACT_VMXcpu(r12);Unlockthecontextvsretnr：mtmsrr0;Putinterruptsoniftheywereandvectoroff

isync

blr

/*

*vec_switch()

**Enteredtohandlethevectorunavailableexceptionand

*switchvectorcontext

**Thiscodeisrunwithvirtualaddressmodeonandinterruptsoff.

**Uponexit，thecodereturnstotheuserscontextwiththevector

*facilityturnedon.

**ENTRY：VMswitchedON

*InterruptsOFF

*StateissavedinsaveareapointedtobyR4.

*Allotherregistersarefree.

*/

ENTRY(vec_switch，TAG_NO_FRAME_USED)

#ifDEBUG

#ifGDDBG

mrr7，r4;Saveinputparameter

lisr3，hi16(EXT(vec_trap_count));Getaddressofvectortrapcounterorir3，r3，lo16(EXT(vec_trap_count));Getaddressofvectortrapcounter

lwzr1，0(r3)lisr5，hi16(EXT(GratefulDeb));Pointtotopofdisplay

orir5，r5，lo16(EXT(GratefulDeb));Putinbottompartaddir1，r1，1

mtlrr5;Setlinkregister

stwr1，0(r3)mrr4，r1

lisr3，1

blrl;Displaycount

mrr4，r7;Restoretheparameter#else

lisr3，hi16(EXT(vec_trap_count));Getaddressofvectortrapcounter

orir3，r3，lo16(EXT(vec_trap_count));Getaddressofvectortrapcounterlwzr1，0(r3)

addir1，r1，1

stwr1，0(r3)

#endif

#endif/*DEBUG*/

mfsprgr6，0/*Gettheper_processorblock*/

mfmsrr19/*GetthecurrentMSR*/

lwzr10，PP_CPU_DATA(r6)/*GettheCPUdatapointer*/

lwzr12，PP_VMX_THREAD(r6)/*Getthethreadthatownsthevector*/

lwzr10，CPU_ACTIVE_THREAD(r10)/*Getthepointertotheactivethread*/

orisr19，r19，hi16(MASK(MSR_VEC))/*Enablethevectorfeature*/

lwzr17，THREAD_TOP_ACT(r10)/*Nowgettheactivationthatisrunning*/

;R12hasthe"old"activation

;R17hasthe"new"activation

#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F01;(TEST/DEBUG)mrr3，r12;(TEST/DEBUG)

mrr5，r17;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#ifGDDBG

lisr3，hi16(EXT(GratefulDeb));Pointtotopofdisplay

mrr18，r4;Savethisorir3，r3，lo16(EXT(GratefulDeb));Putinbottompart

mrr4，r2;Setvaluemtlrr3;Setlinkregister

lir3，1;Displayaddressblrl;Displayit

mrr4，r18;Restoreitmfsprgr6，0;Gettheper_processorblockback

#endif#endif

mr.r12，r12;Seeifthereisanylivevectorstatuslhzr18，PP_CPU_NUMBER(r6);GetourCPUnumbermtmsrr19/*Setvectoravailable*/

isyncbeq-vsnosave;Nolivecontext，sonothingtosave...lir20，ACT_MACT_VMXcpu;PointtotheCPUindication/lockwordvsSpin1：lwarxr19，r20，r12;GetandreservethelastusedCPU

mr.r19，r19;Isitchangingnow？orisr21，r19，hi16(fvChk);Setthe"changing"flag

blt-vsSpin1;Spinifchangingstwcx.r21，r20，r12;Lockitup

bne-vsSpin1;Someoneismessingrightnow

isync;Makesureweseeeverythinglwzr15，ACT_MACT_PCB(r12);Getthecurrentlevelofthe"old"one

cmplwr18，r19;ChecktheCPUthattheoldcontextisliveonlwzr14，ACT_MACT_VMX(r12);Pointtothetopoftheoldcontextstack

bne-vsnosaverel;ContextisnotliveifusedonadifferentCPU...lwzr13，ACT_MACT_VMXlvl(r12);Getthe"old"activelevel;

;First，checktoseeifallwearedoingisenablingbecausethe;"new"contextislive.

;#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F02;(TEST/DEBUG)mrr1，r15;(TEST/DEBUG)

mrr3，r13;(TEST/DEBUG)mrr5，r14;(TEST/DEBUG)

orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)sc;(TEST/DEBUG)

#ifGDDBGlisr3，hi16(EXT(GratefulDeb));Pointtotopofdisplay

mrr8，r4;Savethisorir3，r3，lo16(EXT(GratefulDeb));Putinbottompart

mrr4，r2;Setvaluemtlrr3;Setlinkregister

lir3，1;Displayaddressblrl;Displayit

mrr4，r8;Restoreit#endif

#endif

cmplwcr1，r12，r17;Isthe"old"activationandthe"new"thesame？

cmplwicr2，r14，0;Isthereanysavedcontextonthe"old"activation？bne+cr1，vsmstsave;Theactivationsaredifferentso"old"contextmustbesaved...;

;Hereweknowthatboththe"old"and"new"activationsarethesame.Wewill;checkthecurrentlevelandactivelevels.Iftheyarethesame，thecontextis

;alreadylive，soallwedoisturnonthefacilityandinvalidatethetop;savearea.

;;Ifthecurrentlevel，theactivelevel，andthetopsavearealevelarethe

;same，thenthecontextwassavedaspartofathreadcontextswitchandneither;needssavingorrestoration.

;;Inallothercases，thecontextmustbesavedunlesswearejustre-enabling

;vector.;cmplwr13，r15;Arethelevelsthesame？

cmplwicr2，r14，0;Isthereanysavedcontext？bne-vsmstsave;Levelsaredifferent，weneedtosave...beq-cr2，vrenableret;Nosavedcontextatall，enableandgo...lwzr20，SAVlvlvec(r14);Getthelevelofthetopsavearea#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F03;(TEST/DEBUG)mrr3，r15;(TEST/DEBUG)

mrr5，r20;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#ifGDDBG

lisr3，hi16(EXT(GratefulDeb));Pointtotopofdisplay

mrr8，r4;Savethisorir3，r3，lo16(EXT(GratefulDeb));Putinbottompart

mrr4，r2;Setvaluemtlrr3;Setlinkregister

lir3，1;Displayaddressblrl;Displayit

mrr4，r8;Restoreit#endif

#endif

cmplwr15，r20;Isthetoplevelthesameasthecurrent？

lir0，1;Gettheinvalidflagbne-vrenableret;Notthesame，justenableandgo...stwr0，SAVlvlvec(r14);Invalidatethattopsaveareavrenableret：

sync;Makesureeverythingissaved

stwr19，ACT_MACT_VMXcpu(r12);Saywearenotusingthecontextanymorebvrenable;Thenenableandgo...;

;Weneedtosavethe"old"contexthere.TheLIFOqueueingschemeworks;outforallcasesbecauseifboththe"new"and"old"activationsarethe

;same，therecannotbeanysavedstatetoload.the"new"levelis;truelynew.

;;Whenwesavethecontext，weeitheruseanewsavearea，orthefree

;onethatiscachedattheheadofthelist.vsmstsave：beq-cr2，vsgetsave;Thereisnopossiblecachedsavearealwzr5，SAVlvlvec(r14);Gettheleveloffirstfacilitysavearea

#ifFPVECDBGlisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F04;(TEST/DEBUG)mrr3，r15;(TEST/DEBUG)

orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)sc;(TEST/DEBUG)

#ifGDDBGlisr3，hi16(EXT(GratefulDeb));Pointtotopofdisplay

mrr8，r4;Savethismrr7，r5;Savethis

orir3，r3，lo16(EXT(GratefulDeb));Putinbottompartmrr4，r2;Setvalue

mtlrr3;Setlinkregisterlir3，1;Displayaddress

blrl;Displayitmrr4，r8;Restoreit

mrr5，r7;Restoreit#endif

#endif

mrr3，r14;Assumeweareinvalid

cmplwir5，1;Isitinvalid？cmplwcr1，r5，r13;IstheSAleveltheactiveone？

beq+vsusecache;Invalid，justuseit...beq-cr1，vsnosaverel;TheSAlevelisactive，itisalreadysaved...vsgetsave：mrr3，r4;Usetheinterruptsaveasthecontextsaveareaifnonecached

#ifFPVECDBGlisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F05;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#ifGDDBG

lisr3，hi16(EXT(GratefulDeb));Pointtotopofdisplay

mrr8，r4;Savethisorir3，r3，lo16(EXT(GratefulDeb));Putinbottompart

mrr4，r2;Setvaluemtlrr3;Setlinkregister

lir3，1;Displayaddressblrl;Displayit

mrr4，r8;Restoreitmrr3，r8;Thistoo

#endif#endif

blvsrchsave;Findafreesaveareastwr3，ACT_MACT_VMX(r12);Setthisasthelatestcontextsaveareaforthethread

mfsprgr6，0;Getbackper_processorblockstwr14，SAVprevec(r3);Andthenchainthisinfront

orisr7，r7，hi16(SAVvmxvalid);Settheallocatedbitstwr12，SAVact(r3);Makesurewepointtotherightguy

stwr7，SAVflags(r3);Settheallocationflags

vsusecache：lar11，savevr0(r3);Pointtothe1stlineinarea

stwr13，SAVlvlvec(r3);Setthiscontextlevel#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F06;(TEST/DEBUG)mrr5，r13;(TEST/DEBUG)

orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)sc;(TEST/DEBUG)

#ifGDDBGmrr10，r3

lisr3，hi16(EXT(GratefulDeb));Pointtotopofdisplay

mrr8，r4;Savethisorir3，r3，lo16(EXT(GratefulDeb));Putinbottompart

mrr4，r2;Setvaluemtlrr3;Setlinkregister

lir3，1;Displayaddressblrl;Displayit

mrr4，r8;Restoreitmrr3，r10

mfsprgr6，0;Getbackper_processorblock

#endif#endif

vsgotsave：

lwzr10，liveVRS(r6);GettherightVRSaveregister

lisr9，0x5555;Maskwithoddbitssetrlwinmr11，r10，1，0，31;Shiftover1

orir9，r9，0x5555;Finishmaskorr21，r10，r11;Afterthis，evenbitsshowwhichlinestozapstwr13，SAVlvlvec(r3);Setthesavearealevel

andcr13，r21，r9;Clearoutoddbitslar20，savevr0(r3);Pointtoline0

rlwinmr24，r13，15，0，15;Moveline8-15flagstohighorderoddbitslar23，savevrvalid(r3);Pointtothesavedregistermaskfield

orr24，r13，r24;Settheoddbits;(bit0isline0，bit1isline8，

;bit2isline1，bit3isline9，etc.dcbabr0，r23;Allocatethecacheforit

rlwimir24，r10，16，16，31;Putvrsave0-15intopositions16-31lar21，savevr2(r3);Pointtoline1

mtcrf255，r24;LoaduptheCRsstwr10，savevrvalid(r3);Savethevalidityinformation

mrr22，r20;Startregistersoff;

;Savethecurrentvectorstate;bf0，nol0;Noline0todo...

dcbabr0，r20;Allocatecacheline0nol0：

lar20，savevr4(r3);Pointtoline2

bf2，nol1;Noline1todo...dcbabr0，r21;Allocatecacheline1nol1：

lar21，savevr6(r3);Pointtoline3

bf4，nol2;Noline2todo...dcbabr0，r20;Allocatecacheline2nol2：

lir30，16;Getoffsetforoddregisters

bf16，novr0;DonotsaveVR0...stvxlv0，br0，r22;SaveVR0novr0：

lar23，savevr2(r3);PointtoV2/V3pair

bf17，novr1;DonotsaveVR1...stvxlv1，r30，r22;SaveVR1novr1：

lar20，savevr8(r3);Pointtoline4

bf6，nol3;Noline3todo...dcbabr0，r21;Allocatecacheline3nol3：

lar22，savevr4(r3);PointtoV4/V5pair

bf18，novr2;DonotsaveVR2...stvxlv2，br0，r23;SaveVR2novr2：

bf19，novr3;DonotsaveVR3...

stvxlv3，r30，r23;SaveVR3novr3：

;Note：CR4isnowfree;

lar21，savevr10(r3);Pointtoline5bf8，nol4;Noline4todo...

dcbabr0，r20;Allocatecacheline4nol4：

lar23，savevr6(r3);PointtoR6/R7pair

bf20，novr4;DonotsaveVR4...stvxlv4，br0，r22;SaveVR4novr4：

bf21，novr5;DonotsaveVR5...

stvxlv5，r30，r22;SaveVR5novr5：

mtcrf0x08，r10;SetCRsforregisters16-19

lar20，savevr12(r3);Pointtoline6bf10，nol5;Noline5todo...

dcbabr0，r21;Allocatecacheline5nol5：

lar22，savevr8(r3);PointtoV8/V9pair

bf22，novr6;DonotsaveVR6...stvxlv6，br0，r23;SaveVR6novr6：

bf23，novr7;DonotsaveVR7...

stvxlv7，r30，r23;SaveVR7novr7：

;Note：CR5isnowfree;

lar21，savevr14(r3);Pointtoline7bf12，nol6;Noline6todo...

dcbabr0，r20;Allocatecacheline6nol6：

lar23，savevr10(r3);PointtoV10/V11pair

bf24，novr8;DonotsaveVR8...stvxlv8，br0，r22;SaveVR8novr8：

bf25，novr9;DonotsaveVR9...

stvxlv9，r30，r22;SaveVR9novr9：

mtcrf0x04，r10;SetCRsforregisters20-23

lar20，savevr16(r3);Pointtoline8bf14，nol7;Noline7todo...

dcbabr0，r21;Allocatecacheline7nol7：

lar22，savevr12(r3);PointtoV12/V13pair

bf26，novr10;DonotsaveVR10...stvxlv10，br0，r23;SaveVR10novr10：

bf27，novr11;DonotsaveVR11...

stvxlv11，r30，r23;SaveVR11novr11：

;Note：CR6isnowfree;

lar21，savevr18(r3);Pointtoline9bf1，nol8;Noline8todo...

dcbabr0，r20;Allocatecacheline8nol8：

lar23，savevr14(r3);PointtoV14/V15pair

bf28，novr12;DonotsaveVR12...stvxlv12，br0，r22;SaveVR12novr12：

bf29，novr13;DonotsaveVR13...

stvxlv13，r30，r22;SaveVR13novr13：

mtcrf0x02，r10;SetCRsforregisters24-27

lar20，savevr20(r3);Pointtoline10bf3，nol9;Noline9todo...

dcbabr0，r21;Allocatecacheline9nol9：

lar22，savevr16(r3);PointtoV16/V17pair

bf30，novr14;DonotsaveVR14...stvxlv14，br0，r23;SaveVR14novr14：

bf31，novr15;DonotsaveVR15...

stvxlv15，r30，r23;SaveVR15novr15：

;Note：CR7isnowfree;

lar21，savevr22(r3);Pointtoline11bf5，nol10;Noline10todo...

dcbabr0，r20;Allocatecacheline10nol10：

lar23，savevr18(r3);PointtoV18/V19pair

bf16，novr16;DonotsaveVR16...stvxlv16，br0，r22;SaveVR16novr16：

bf17，novr17;DonotsaveVR17...

stvxlv17，r30，r22;SaveVR17novr17：

mtcrf0x01，r10;SetCRsforregisters28-31

;;Note：AllregistershavebeenorareaccountedforinCRs

;lar20，savevr24(r3);Pointtoline12

bf7，nol11;Noline11todo...dcbabr0，r21;Allocatecacheline11nol11：

lar22，savevr20(r3);PointtoV20/V21pair

bf18，novr18;DonotsaveVR18...stvxlv18，br0，r23;SaveVR18novr18：

bf19，novr19;DonotsaveVR19...

stvxlv19，r30，r23;SaveVR19novr19：

lar21，savevr26(r3);Pointtoline13

bf9，nol12;Noline12todo...dcbabr0，r20;Allocatecacheline12nol12：

lar23，savevr22(r3);PointtoV22/V23pair

bf20，novr20;DonotsaveVR20...stvxlv20，br0，r22;SaveVR20novr20：

bf21，novr21;DonotsaveVR21...

stvxlv21，r30，r22;SaveVR21novr21：

lar20，savevr28(r3);Pointtoline14

bf11，nol13;Noline13todo...dcbabr0，r21;Allocatecacheline13nol13：

lar22，savevr24(r3);PointtoV24/V25pair

bf22，novr22;DonotsaveVR22...stvxlv22，br0，r23;SaveVR22novr22：

bf23，novr23;DonotsaveVR23...

stvxlv23，r30，r23;SaveVR23novr23：

lar21，savevr30(r3);Pointtoline15

bf13，nol14;Noline14todo...dcbabr0，r20;Allocatecacheline14nol14：

lar23，savevr26(r3);PointtoV26/V27pair

bf24，novr24;DonotsaveVR24...stvxlv24，br0，r22;SaveVR24novr24：

bf25，novr25;DonotsaveVR25...

stvxlv25，r30，r22;SaveVR25novr25：

bf15，nol15;Noline15todo...

dcbabr0，r21;Allocatecacheline15nol15：

;Note：Allcachelinesallocatednow;

lar22，savevr28(r3);PointtoV28/V29pairbf26，novr26;DonotsaveVR26...

stvxlv26，br0，r23;SaveVR26novr26：

bf27，novr27;DonotsaveVR27...

stvxlv27，r30，r23;SaveVR27novr27：

lar23，savevr30(r3);PointtoV30/V31pair

bf28，novr28;DonotsaveVR28...stvxlv28，br0，r22;SaveVR28novr28：

mfvscrv27;GettheVSCR

bf29，novr29;DonotsaveVR29...stvxlv29，r30，r22;SaveVR29novr29：

lar22，savevscr(r3);PointtotheVSCRsavearea

bf30，novr30;DonotsaveVR30...stvxlv30，br0，r23;SaveVR30novr30：

dcbabr0，r22;AllocateVSCRsavearea

bf31，novr31;DonotsaveVR31...stvxlv31，r30，r23;SaveVR31novr31：

stvxlv27，br0，r22;SavetheVSCR

/*

*Nowcheckoutthecurrentthreadandseeifweneedtoloaduphiscontext.

*Ifwedo(andthisshouldbethenormalcase)，doitandthenreleasethe

*savearea.

*Ifwedon't(remember，wealreadytookcareofthecasewherewejustenable

*thevector)，weneedtofilltheregisterswithgarbage，becausethisthreadhas

*neverusedthembeforeandsomethievingbastardcouldhacktheoldvalues

*ofsomethread！Justimaginewhatwouldhappeniftheycould！Why，nothing

*wouldbesafe！MyGosh！It'sterrifying！

*/

vsnosaverel：

sync;Makesureeverythingissaved

stwr19，ACT_MACT_VMXcpu(r12);Saywearenotusingthecontextanymore

vsnosave：

lir20，ACT_MACT_VMXcpu;PointtotheCPUindication/lockwordvsSpin2：lwarxr19，r20，r17;GetandreservethelastusedCPU

mr.r19，r19;Isitchangingnow？orisr21，r19，hi16(fvChk);Setthe"changing"flag

blt-vsSpin2;Spinifchangingstwcx.r21，r20，r17;Lockitup

bne-vsSpin2;Someoneismessingrightnow

isync;Makesureweseeeverythinglwzr15，ACT_MACT_PCB(r17);Getthecurrentlevelofthe"new"one

lwzr14，ACT_MACT_VMX(r17);Pointtothetopofthe"new"contextstacklwzr13，ACT_MACT_VMXlvl(r17);Getthe"new"activelevel#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F07;(TEST/DEBUG)mrr1，r15;(TEST/DEBUG)

mrr3，r14;(TEST/DEBUG)mrr5，r13;(TEST/DEBUG)

orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)sc;(TEST/DEBUG)

#endif

cmplwicr1，r14，0;Dowepossiblyhavesomecontexttoload？

stwr15，ACT_MACT_VMXlvl(r17);Setthe"new"activelevellar23，savevscr(r14);PointtotheVSCR

lar20，savevr0(r14);Pointtofirstlinetobringinstwr17，PP_VMX_THREAD(r6);Storecurrentthreadaddressinvmx_threadtoclaimvectorforthread

beq-cr1，ProtectTheAmericanWay;Nothingtorestore，firsttimeuse...lwzr0，SAVlvlvec(r14);Gettheleveloffirstfacilitysavearea

cmplwr0，r15;Toplevelcorrecttoload？bne-ProtectTheAmericanWay;No，goinitialize...#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F08;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#ifGDDBG

mrr8，r3

lisr3，hi16(EXT(GratefulDeb));Pointtotopofdisplay

mrr22，r4;Savethisorir3，r3，lo16(EXT(GratefulDeb));Putinbottompart

mrr4，r2;Setvaluemtlrr3;Setlinkregister

lir3，1;Displayaddressblrl;Displayit

mrr4，r22;Restoreitmrr3，r8

#endif

#endif

lir0，1;Getthelevelinvalidindication

lwzr22，savevrsave(r4);GetthemostcurrentVRSAVElwzr10，savevrvalid(r14);GetthevalidVRsinthesavearea

lisr9，0x5555;Maskwithoddbitssetandr10，r10，r22;Figureoutjustwhatregistersneedtobeloaded

orir9，r9，0x5555;Finishmaskrlwinmr11，r10，1，0，31;Shiftover1

stwr0，SAVlvlvec(r14);Markthesaveareainvalidbecauseweareactivatingagainorr12，r10，r11;Afterthis，evenbitsshowwhichlinestotouch

dcbtbr0，r23;TouchintheVSCRandcr13，r12，r9;Clearoutoddbitslar20，savevr0(r14);Pointtoline0

rlwinmr3，r13，15，0，15;Moveline8-15flagstohighorderoddbitslar21，savevr2(r3);Pointtoline1

orr3，r13，r3;Settheoddbits;(bit0isline0，bit1isline8，

;bit2isline1，bit3isline9，etc.lvxlv31，br0，r23;GettheVSCR

rlwimir3，r10，16，16，31;Putvrsave0-15intopositions16-31mtvscrv31;SlamtheVSCRvalue

mtcrf255，r3;LoaduptheCRsmrr22，r20;Startregistersoff

;;Loadthenewvectorstate

;bf0，lnol0;Noline0todo...

dcbtbr0，r20;Touchcacheline0lnol0：

lar20，savevr4(r14);Pointtoline2

bf2，lnol1;Noline1todo...dcbtbr0，r21;Touchcacheline1lnol1：

lar21，savevr6(r14);Pointtoline3

bf4，lnol2;Noline2todo...dcbtbr0，r20;Touchcacheline2lnol2：

lir30，16;Getoffsetforoddregisters

bf16，lnovr0;DonotrestoreVR0...lvxlv0，br0，r22;RestoreVR0lnovr0：

lar23，savevr2(r14);PointtoV2/V3pair

bf17，lnovr1;DonotrestoreVR1...lvxlv1，r30，r22;RestoreVR1lnovr1：

lar20，savevr8(r14);Pointtoline4

bf6，lnol3;Noline3todo...dcbtbr0，r21;Touchcacheline3lnol3：

lar22，savevr4(r14);PointtoV4/V5pair

bf18，lnovr2;DonotrestoreVR2...lvxlv2，br0，r23;RestoreVR2lnovr2：

bf19，lnovr3;DonotrestoreVR3...

lvxlv3，r30，r23;RestoreVR3lnovr3：

;Note：CR4isnowfree;

lar21，savevr10(r14);Pointtoline5bf8，lnol4;Noline4todo...

dcbtbr0，r20;Touchcacheline4lnol4：

lar23，savevr6(r14);PointtoR6/R7pair

bf20，lnovr4;DonotrestoreVR4...lvxlv4，br0，r22;RestoreVR4lnovr4：

bf21，lnovr5;DonotrestoreVR5...

lvxlv5，r30，r22;RestoreVR5lnovr5：

mtcrf0x08，r10;SetCRsforregisters16-19

lar20，savevr12(r14);Pointtoline6bf10，lnol5;Noline5todo...

dcbtbr0，r21;Touchcacheline5lnol5：

lar22，savevr8(r14);PointtoV8/V9pair

bf22，lnovr6;DonotrestoreVR6...lvxlv6，br0，r23;RestoreVR6lnovr6：

bf23，lnovr7;DonotrestoreVR7...

lvxlv7，r30，r23;RestoreVR7lnovr7：

;Note：CR5isnowfree;

lar21，savevr14(r14);Pointtoline7bf12，lnol6;Noline6todo...

dcbtbr0，r20;Touchcacheline6lnol6：

lar23，savevr10(r14);PointtoV10/V11pair

bf24，lnovr8;DonotrestoreVR8...lvxlv8，br0，r22;RestoreVR8lnovr8：

bf25，lnovr9;DonotsaveVR9...

lvxlv9，r30，r22;RestoreVR9lnovr9：

mtcrf0x04，r10;SetCRsforregisters20-23

lar20，savevr16(r14);Pointtoline8bf14，lnol7;Noline7todo...

dcbtbr0，r21;Touchcacheline7lnol7：

lar22，savevr12(r14);PointtoV12/V13pair

bf26，lnovr10;DonotrestoreVR10...lvxlv10，br0，r23;RestoreVR10lnovr10：

bf27，lnovr11;DonotrestoreVR11...

lvxlv11，r30，r23;RestoreVR11lnovr11：

;Note：CR6isnowfree;

lar21，savevr18(r14);Pointtoline9bf1，lnol8;Noline8todo...

dcbtbr0，r20;Touchcacheline8lnol8：

lar23，savevr14(r14);PointtoV14/V15pair

bf28，lnovr12;DonotrestoreVR12...lvxlv12，br0，r22;RestoreVR12lnovr12：

bf29，lnovr13;DonotrestoreVR13...

lvxlv13，r30，r22;RestoreVR13lnovr13：

mtcrf0x02，r10;SetCRsforregisters24-27

lar20，savevr20(r14);Pointtoline10bf3，lnol9;Noline9todo...

dcbtbr0，r21;Touchcacheline9lnol9：

lar22，savevr16(r14);PointtoV16/V17pair

bf30，lnovr14;DonotrestoreVR14...lvxlv14，br0，r23;RestoreVR14lnovr14：

bf31，lnovr15;DonotrestoreVR15...

lvxlv15，r30，r23;RestoreVR15lnovr15：

;Note：CR7isnowfree;

lar21，savevr22(r14);Pointtoline11bf5，lnol10;Noline10todo...

dcbtbr0，r20;Touchcacheline10lnol10：

lar23，savevr18(r14);PointtoV18/V19pair

bf16，lnovr16;DonotrestoreVR16...lvxlv16，br0，r22;RestoreVR16lnovr16：

bf17，lnovr17;DonotrestoreVR17...

lvxlv17，r30，r22;RestoreVR17lnovr17：

mtcrf0x01，r10;SetCRsforregisters28-31

;;Note：AllregistershavebeenorareaccountedforinCRs

;lar20，savevr24(r14);Pointtoline12

bf7，lnol11;Noline11todo...dcbtbr0，r21;Touchcacheline11lnol11：

lar22，savevr20(r14);PointtoV20/V21pair

bf18，lnovr18;DonotrestoreVR18...lvxlv18，br0，r23;RestoreVR18lnovr18：

bf19，lnovr19;DonotrestoreVR19...

lvxlv19，r30，r23;RestoreVR19lnovr19：

lar21，savevr26(r14);Pointtoline13

bf9，lnol12;Noline12todo...dcbtbr0，r20;Touchcacheline12lnol12：

lar23，savevr22(r14);PointtoV22/V23pair

bf20，lnovr20;DonotrestoreVR20...lvxlv20，br0，r22;RestoreVR20lnovr20：

bf21，lnovr21;DonotrestoreVR21...

lvxlv21，r30，r22;RestoreVR21lnovr21：

lar20，savevr28(r14);Pointtoline14

bf11，lnol13;Noline13todo...dcbtbr0，r21;Touchcacheline13lnol13：

lar22，savevr24(r14);PointtoV24/V25pair

bf22，lnovr22;DonotrestoreVR22...lvxlv22，br0，r23;RestoreVR22lnovr22：

bf23，lnovr23;DonotrestoreVR23...

lvxlv23，r30，r23;RestoreVR23lnovr23：

lar21，savevr30(r14);Pointtoline15

bf13，lnol14;Noline14todo...dcbtbr0，r20;Touchcacheline14lnol14：

lar23，savevr26(r14);PointtoV26/V27pair

bf24，lnovr24;DonotrestoreVR24...lvxlv24，br0，r22;RestoreVR24lnovr24：

bf25，lnovr25;DonotrestoreVR25...

lvxlv25，r30，r22;RestoreVR25lnovr25：

bf15，lnol15;Noline15todo...

dcbtbr0，r21;Touchcacheline15lnol15：

;Note：Allneededcachelineshavebeentouchednow;

lar22，savevr28(r14);PointtoV28/V29pairbf26，lnovr26;DonotrestoreVR26...

lvxlv26，br0，r23;RestoreVR26lnovr26：

bf27，lnovr27;DonotrestoreVR27...

lvxlv27，r30，r23;RestoreVR27lnovr27：

lar23，savevr30(r14);PointtoV30/V31pair

bf28，lnovr28;DonotrestoreVR28...lvxlv28，br0，r22;RestoreVR28lnovr28：

bf29，lnovr29;DonotrestoreVR29...

lvxlv29，r30，r22;RestoreVR29lnovr29：

bf30，lnovr30;DonotrestoreVR30...

lvxlv30，br0，r23;RestoreVR30lnovr30：

;EverythingisrestorednowexceptforVR31.Weneedittoget;theQNaNBarbarianvaluetoputintoidlevectorregisters

;lisr5，hi16(EXT(QNaNbarbarian));Getaddressofemptyvalue

cmpwir10，-1;Handlethequickcaseofallregistersinuseorir5，r5，lo16(EXT(QNaNbarbarian));Getlowaddressofemptyvalue

beq-mstlvr31;Notlikely，butallareinuse...mtcrf255，r10;Getmaskofvalidregisters

lvxlv31，br0，r5;InitializeVR31totheemptyvalue

bt0，ni0;Registerisokalready...

vorv0，v31，v31;Copyintothenextregisterni0：

bt1，ni1;Registerisokalready...

vorv1，v31，v31;Copyintothenextregisterni1：

bt2，ni2;Registerisokalready...

vorv2，v31，v31;Copyintothenextregisterni2：

bt3，ni3;Registerisokalready...

vorv3，v31，v31;Copyintothenextregisterni3：

bt4，ni4;Registerisokalready...

vorv4，v31，v31;Copyintothenextregisterni4：

bt5，ni5;Registerisokalready...

vorv5，v31，v31;Copyintothenextregisterni5：

bt6，ni6;Registerisokalready...

vorv6，v31，v31;Copyintothenextregisterni6：

bt7，ni7;Registerisokalready...

vorv7，v31，v31;Copyintothenextregisterni7：

bt8，ni8;Registerisokalready...

vorv8，v31，v31;Copyintothenextregisterni8：

bt9，ni9;Registerisokalready...

vorv9，v31，v31;Copyintothenextregisterni9：

bt10，ni10;Registerisokalready...

vorv10，v31，v31;Copyintothenextregisterni10：

bt11，ni11;Registerisokalready...

vorv11，v31，v31;Copyintothenextregisterni11：

bt12，ni12;Registerisokalready...

vorv12，v31，v31;Copyintothenextregisterni12：

bt13，ni13;Registerisokalready...

vorv13，v31，v31;Copyintothenextregisterni13：

bt14，ni14;Registerisokalready...

vorv14，v31，v31;Copyintothenextregisterni14：

bt15，ni15;Registerisokalready...

vorv15，v31，v31;Copyintothenextregisterni15：

bt16，ni16;Registerisokalready...

vorv16，v31，v31;Copyintothenextregisterni16：

bt17，ni17;Registerisokalready...

vorv17，v31，v31;Copyintothenextregisterni17：

bt18，ni18;Registerisokalready...

vorv18，v31，v31;Copyintothenextregisterni18：

bt19，ni19;Registerisokalready...

vorv19，v31，v31;Copyintothenextregisterni19：

bt20，ni20;Registerisokalready...

vorv20，v31，v31;Copyintothenextregisterni20：

bt21，ni21;Registerisokalready...

vorv21，v31，v31;Copyintothenextregisterni21：

bt22，ni22;Registerisokalready...

vorv22，v31，v31;Copyintothenextregisterni22：

bt23，ni23;Registerisokalready...

vorv23，v31，v31;Copyintothenextregisterni23：

bt24，ni24;Registerisokalready...

vorv24，v31，v31;Copyintothenextregisterni24：

bt25，ni25;Registerisokalready...

vorv25，v31，v31;Copyintothenextregisterni25：

bt26，ni26;Registerisokalready...

vorv26，v31，v31;Copyintothenextregisterni26：

bt27，ni27;Registerisokalready...

vorv27，v31，v31;Copyintothenextregisterni27：

bt28，ni28;Registerisokalready...

vorv28，v31，v31;Copyintothenextregisterni28：

bt29，ni29;Registerisokalready...

vorv29，v31，v31;Copyintothenextregisterni29：

bt30，ni30;Registerisokalready...

vorv30，v31，v31;Copyintothenextregisterni30：

bf31，lnovr31;R31isempty，noneedtorestore...mstlvr31：lvxlv31，r30，r23;RestoreVR31lnovr31：

vrenablexx：sync;Makesureallissaved

stwr18，ACT_MACT_VMXcpu(r17);SettheactiveCPUandreleasevrenable：

lwzr9，SAVflags(r4)/*Gettheflagsofthecurrentsavearea*/

lwzr8，savesrr1(r4);Getthemsroftheinterruptedguy

rlwinmr5，r4，0，0，19/*Getthepageaddressofthesavearea*/orisr8，r8，hi16(MASK(MSR_VEC));Enablethevectorfacility

lwzr10，ACT_MACT_SPF(r17);Getthespecialflagslisr7，hi16(SAVattach)/*Gettheattachedflag*/

lwzr5，SACvrswap(r5)/*GetVirtualtoRealtranslation*/

orisr10，r10，hi16(vectorUsed|vectorCng);Setthatweusedvectors

mr.r15，r15;Seeifwearedoingthisforuserstatestwr8，savesrr1(r4);Setthemsroftheinterruptedguy

andcr9，r9，r7/*Cleartheattachedbit*/xorr3，r4，r5/*Gettherealaddressofthesavearea*/

stwr9，SAVflags(r4)/*Settheflagsofthecurrentsavearea*/

bne-vrnuser;Wearenotuserstate...

stwr10，ACT_MACT_SPF(r17);Settheactivationcopystwr10，spcFlags(r6);Setper_proccopyvrnuser：

#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F0A;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#ifGDDBG

mrr8，r3;Savethis

lisr3，hi16(EXT(GratefulDeb));Pointtotopofdisplayorir3，r3，lo16(EXT(GratefulDeb));Putinbottompart

mrr4，r2;Setvaluemtlrr3;Setlinkregister

lir3，1;Displayaddressblrl;Displayit

mrr3，r8;Restoreit#endif

#endif

bEXT(exception_exit)/*Exitfromthefray...*/

/*

*Initializetheregisterstosomebogusvalue

*Wemakesurethatnon-Javamodeisthedefaulthere

*/

ProtectTheAmericanWay：

#if0

lwzr10，savesrr1(r4);(TEST/DEBUG)

rlwinm.r10，r10，0，MSR_PR_BIT，MSR_PR_BIT;(TEST/DEBUG)beq-nxxxxxx2;(TEST/DEBUG)

lwzr10，ACT_MACT_SPF(r17);(TEST/DEBUG)rlwinm.r10，r10，0，2，2;(TEST/DEBUG)

beq+nxxxxxx2BREAKPOINT_TRAP;(TEST/DEBUG)

nxxxxxx2：#endif

#ifFPVECDBG

lisr0，HIGH_ADDR(CutTrace);(TEST/DEBUG)

lir2，0x5F09;(TEST/DEBUG)orisr0，r0，LOW_ADDR(CutTrace);(TEST/DEBUG)

sc;(TEST/DEBUG)#ifGDDBG

lisr3，hi16(EXT(GratefulDeb));Pointtotopofdisplay

mrr8，r4;Savethisorir3，r3，lo16(EXT(GratefulDeb));Putinbottompart

mrr4，r2;Setvaluemtlrr3;Setlinkregister

lir3，1;Displayaddressblrl;Displayit

mrr4，r8;Restoreit#endif

#endif

lisr5，hi16(EXT(QNaNbarbarian));Getaddressofemptyvalue

vspltishv1，1;Turnonthenon-Javabitandsaturateorir5，r5，lo16(EXT(QNaNbarbarian));Getlowaddressofemptyvalue

vspltiswv2，1;Turnonthesaturatebitlvxlv0，br0，r5;InitializeVR0

vxorv1，v1，v2;Turnoffsaturatevorv2，v0，v0;Copyintothenextregister

mtvscrv1;Clearthevectorstatusregistervorv3，v0，v0;Copyintothenextregister

vorv1，v0，v0;Copyintothenextregistervorv4，v0，v0;Copyintothenextregister

vorv5，v0，v0;Copyintothenextregistervorv6，v0，v0;Copyintothenextregister

vorv7，v0，v0;Copyintothenextregistervorv8，v0，v0;Copyintothenextregister

vorv9，v0，v0;Copyintothenextregistervorv10，v0，v0;Copyintothenextregister

vorv11，v0，v0;Copyintothenextregistervorv12，v0，v0;Copyintothenextregister

vorv13，v0，v0;Copyintothenextregistervorv14，v0，v0;Copyintothenextregister

vorv15，v0，v0;Copyintothenextregistervorv16，v0，v0;Copyintothenextregister

vorv17，v0，v0;Copyintothenextregistervorv18，v0，v0;Copyintothenextregister

vorv19，v0，v0;Copyintothenextregistervorv20，v0，v0;Copyintothenextregister

vorv21，v0，v0;Copyintothenextregistervorv22，v0，v0;Copyintothenextregister

vorv23，v0，v0;Copyintothenextregistervorv24，v0，v0;Copyintothenextregister

vorv25，v0，v0;Copyintothenextregistervorv26，v0，v0;Copyintothenextregister

vorv27，v0，v0;Copyintothenextregistervorv28，v0，v0;Copyintothenextregister

vorv29，v0，v0;Copyintothenextregistervorv30，v0，v0;Copyintothenextregister

vorv31，v0，v0;Copyintothenextregisterbvrenablexx;Finishsettingitallup...;

;Findsaunusedvectorareaintheactivationpointed;tobyR12ssavedcontexts.Ifnonearefound(unlikelybutpossible)

;andR3is0，anewareaisallocated.IfR3isnon-zero，itcontains;apointertoavectorsaveareathatisfree.

vsrchsave：lwzr6，ACT_MACT_PCB(r12);Getthefirst"normal"saveareavsrnorm：mr.r5，r6;Isthereanother？

beq-vsrvect;No，searchthefloatingpointsaveareas...lwzr7，SAVflags(r5);Gettheflagsforthisguy

lwzr6，SAVprev(r5);Gettheprevioussavearea，justincaseandis.r8，r7，hi16(SAVvmxvalid);Havewefoundanemptyvectorsaveinnormal？

beq+vsrgot;Wefoundone...bvsrnorm;Searchagain...vsrvect：lwzr6，ACT_MACT_FPU(r12);Getthefirst"floatingpoint"saveareavsrvectx：mr.r5，r6;Isthereanother？

beq-vsrget;No，trytoallocateone...lwzr7，SAVflags(r5);Gettheflagsforthisguy

lwzr6，SAVprefp(r5);Gettheprevioussavearea，justincaseandis.r8，r7，hi16(SAVvmxvalid);Havewefoundanemptyvectorsaveinfloat？

bne-vsrvectx;Searchagain...vsrgot：mrr3，r5;Getthesaveareaintotherightregister

blr;Return...

vsrget：mr.r5，r3;Doweallocateoruseexisting？

beq+vsrallo;Allocateone...lwzr7，SAVflags(r3);Getthepassedinareaflags

blr;Return...;

;NOTE：save_getwillreturndirectlyandsetR7to0...;

vsrallo：bEXT(save_get);Getafreshsavearea

尼康d610报错er

作为一名经验丰富的职业摄影师，我们经常会遇到各种各样的问题和挑战。其中，尼康d5300err报错是一种常见的问题，它可能会让摄影师感到困惑和沮丧。我们将从专业摄影师的角度出发，为您解析尼康d5300err报错的原因和解决方法。

关于尼康d5300err报错的第二个知识点是，存储卡故障可能是导致报错的原因之一。err02通常表示存储卡读写错误，可能是由于存储卡损坏或不兼容所致。为了解决这个问题，您可以尝试使用另一张存储卡，确保它的速度和容量满足相机要求。您还可以尝试将存储卡格式化，以清除任何潜在的问题。

让我们来解析其中一个常见的错误代码-err01。err01提示通常与镜头连接问题有关，可能是因为相机无法正确识别镜头或电子接口存在故障。要解决这个问题，您可以尝试重新插拔镜头，确保它被完全插入并锁定。您还可以清理镜头和相机接口上的金属接点，确保它们没有灰尘或脏污。

第三个知识点是，相机传感器问题可能会导致尼康d5300err报错。err05通常表示传感器清理错误，可能是由于传感器表面有灰尘或污渍所致。为了解决这个问题，您可以将相机设置为传感器清理模式，并使用相机提供的清理工具进行清理。如果问题仍然存在，您可以考虑将相机送修，让专业维修人员对传感器进行彻底的清洁和维护。

让我们拓展一下关于尼康d5300err报错的知识要点。除了上述提到的常见错误代码，尼康d5300还可能遇到其他报错情况，如err11、err30等。对于这些报错，我们建议您查看相机用户手册或访问尼康官方网站，查找详细的报错代码解释和解决方法。此外，及时进行固件更新也是解决相机报错问题的有效措施之一。

总结了上述的几个知识要点，我们可以得出以下结论：尼康d5300err报错是相机遇到问题时的一种错误提示，常见的报错代码包括err01、err02、err05等。这些报错可能与镜头连接问题、存储卡故障、相机传感器问题等有关。为了解决这些问题，我们可以尝试重新插拔镜头，清理镜头和相机接口，更换存储卡，进行传感器清理，或及时进行固件更新。如果问题仍然存在，建议联系尼康官方服务中心或经验丰富的相机维修人员进行进一步的故障诊断和排除。

尼康d610显示fee

有了这些基础概念后，我们来看“尼康D7500显示fee”的问题：

“尼康D7500显示fee”指的是使用非CPU镜头时，在相机上查看光圈和快门值时出现“fee”提示，无法进行拍摄或变换参数的现象。非CPU镜头没有内置芯片，无法与相机进行通信，因此相机无法自动识别光圈和快门值。

“尼康D7500显示fee”的现象是因为使用了无内置芯片的非CPU镜头，需要手动设置光圈和快门值进行拍摄。摄影爱好者在使用这种镜头进行拍摄时，需要根据不同拍摄需求和条件，合理调节参数并进行尝试。

昨天收货。收快递时候用50/1.4G测试了一下。可以用，也就签收了。没想到晚上挂上D头和AI头，问题就来了。一直显示FEE，手动头的光圈，显示都是错误的。早上和尼康售后打了电话，恢复出厂设置，问题依旧。和售后确认，基本上是光圈耦合杆有问题。

关于“尼康D7500显示fee”的知识，首先需要了解一些基础概念：

1.全副画幅相机：指画幅大小与35mm胶片相同，传感器尺寸大，像素数量较高，可拍摄更高质量的照片。

2.卡片机：也叫便携数码相机，机身小巧轻便，适合日常使用和旅游拍照等非专业场景。

3.APS-C画幅相机：是一种介于全副画幅相机和卡片机之间的相机类型。其传感器尺寸和画幅大小都比卡片机要大，但又比全副画幅相机要小。

4.透过光学取景器：指使用镜头透过光学视窗观察拍摄场景的方式，与使用LCD屏幕或电子取景器的方式不同。

5.LCD屏幕：相机背部上的显示屏，可用于查看拍摄的照片、菜单设置等。

6.电子取景器：与LCD屏幕功能相似，可通过相机内置的传感器显示实时的取景画面。

解决这个问题的方法是手动设置光圈和快门值。具体操作方法如下：

1.将相机拨轮调至M模式。

2.在镜头上手动调节光圈大小。

3.按住曝光补偿按钮，同时旋转前后控制环旋转调节快门值。

4.按下快门按钮进行拍摄。

尼康d610报错r22

r22与r123同属氢氯氟烃，但r22的臭氧层破坏力是r123的2.5倍，温室效应指数是r123的17倍。

r134a的比容是r22的1.47倍，且蒸发潜热小，因此就同排气体积的压缩机而言，r134a机组的冷冻能力仅为r22机组的60%。

r134a的热传导率比r22下降10%，因此换热器的换热面积增大。

r22临界压力比r123高1300kpa，机组内部提高，泄漏几率提高。

应用广泛应用于家庭、商业、工业空调、冷冻离心式冷水机组螺杆式、离心式冷水机组理论上同r22但许多实际技术尚未解决家用空调、冰箱

r134a的吸水性很强，是r22的20倍，因此对r134a机组系统中干燥器的要求较高，以避免系统的冰堵现象。

根据冷凝压力，制冷剂可分为三类：高温(低压)制冷剂、中温(中压)制冷剂和低温(高压)制冷剂。

无机化合物制冷剂：这类制冷剂使用得比较早，如氨(NH3)、水(H2O)、空气、二氧化碳(CO2)和二氧化硫(SO2)等。对于无机化合物制冷剂，国际上规定的代号为R及后面的三位数字，其中第一位为“7”后两位数字为分子量。如水R718...等。

氟里昂(卤碳化合物制冷剂)：氟里昂是饱和碳氢化合物中全部或部分氢元素(CL)、氟(F)和溴(Br)代替后衍生物的总称。国际规定用“R”作为这类制冷剂的代号，如R22...等。

饱和碳氢化合物：这类制冷剂中主要有甲烷、乙烷、丙烷、丁烷和环状有机化合物等。代号与氟里昂一样采用“R”，这类制冷剂易燃易爆，安全性很差。如R50、R170、R290...等。

不饱和碳氢化合物制冷剂：这类制冷剂中主要是乙烯(C2H4)、丙烯(C3H6)和它们的卤族元素衍生物，它们的R后的数字多为“1”，如R113、R1150...等。

共沸混合物制冷剂：这类制冷剂是由两种以上不同制冷剂以一定比例混合而成的共沸混合物，这类制冷剂在一定压力下能保持一定的蒸发温度，其气相或液相始终保持组成比例不变，但它们的热力性质却不同于混合前的物质，利用共沸混合物可以改善制冷剂的特性。如R500、R502...等。

⑺现在的空调制冷剂用的是什么

在空调的外机铭牌上面就能看到标注、目前主要就是两种：

1、r22氟利昂制冷剂

2、r410环保制冷剂

氟里昂能够破坏臭氧层是因为制冷剂中有cl元素的存在，而且随着cl原子数量的增加，对臭氧层破坏能力增加，随着h元素含量的增加对臭氧层破坏能力降低；造成温室效应主要是因为制冷剂在缓慢氧化分解过程中，生成大量的温室气体，如co2等。根据氟里昂制冷剂的分子结构，大致可以分为以下3类：

1.氯氟烃类：简称cfc，主要包括r11、r12、r113、r114、r115、r500、r502等，由于对臭氧层的破坏作用以及最大，被《蒙特利尔议定书》列为一类受控物质。此类物质目前已禁止使用，在制造聚氨酯海绵的过程中，r11已由r141b作为过渡性替代品。

2.氢氯氟烃：简称hcfc，主要包括r22、r123、r141b、r142b等，臭氧层破坏系数仅仅是r11的百分之几，目前hcfc类物质被视为cfc类物质的最重要的过渡性替代物质。在《蒙特利尔议定书》中r22被限定2020年淘汰，r123被限定2030年，发展中国家可以推迟10年。

3.氢氟烃类：简称hfc，主要包括r134a，r125，r32，r407c，r410a、r152等，臭氧层破坏系数为0，但是气候变暖潜能值很高。在《蒙特利尔议定书》没有规定其使用期限，在《联合国气候变化框架公约》京都议定书中定性为温室气体。

我们目前所使用的所有制冷剂全部都是氟里昂制品，非氟里昂制冷剂到目前为止还没有研发出来。在新的制冷剂研发出来之前，我们所要解决的是空调机组选用那种制冷剂，对我们赖以生存的环境造成的破坏力相对小一些。我们应当明令禁止的应当是第1类产品，而不是第2类、第3类制冷剂。

二、几种制冷剂的比较

目前，在空调制冷行业中，除了汽车空调行业外，其他领域的制冷设备如：家用冰箱、空调、食品冷冻冷藏柜、运输冷藏设备、速冻机、中央空调等基本上还是以过渡性冷媒r22为主要的产品。从国内的主要冷水机组生产厂商生产的产品来看，活塞式、涡旋式冷水机组普遍采用r22制冷剂；螺杆式冷水机组采用r22和r134a制冷剂，但从2001年螺杆式冷水机组总体销售量上来看，采用r22制冷剂的销售量占有相当大的比重；离心式冷水机组采用r22、r123和r134a制冷剂，r123、r134a产品的市场销售情况占总量的40％左右。

评价一种制冷剂的好坏，我认为应当综合考虑下列因素：

1.臭氧层破坏潜能值，简称odp值；

2.全球变暖潜能值，简称gwp值；

3.理想循环状况下的制冷系数，简称cop值；

4.安全性；

5.经济性。