*
* @APPLE_LICENSE_HEADER_END@
*/
+
+#define FPVECDBG 0
+
#include <assym.s>
#include <debug.h>
-#include <cpus.h>
#include <db_machine_commands.h>
#include <mach_rt.h>
#include <ppc/exception.h>
#include <ppc/Performance.h>
#include <ppc/exception.h>
-#include <ppc/pmap_internals.h>
+#include <ppc/savearea.h>
#include <mach/ppc/vm_param.h>
.text
+/* Register usage conventions in this code:
+ * r9 = return address
+ * r10 = per-proc ptr
+ * r11 = MSR at entry
+ * cr6 = feature flags (ie, pf64Bit)
+ *
+ * Because much of this code deals with physical addresses,
+ * there are parallel paths for 32- and 64-bit machines.
+ */
+
+
/*
- * This routine will add a savearea block to the free list.
- * Note really well: we can take NO exceptions of any kind,
- * including a PTE miss once the savearea lock is held. That's
- * a guaranteed deadlock. That means we must disable for interrutions
- * and turn all translation off.
+ * *****************************
+ * * s a v e _ s n a p s h o t *
+ * *****************************
*
- * Note that the savearea list should NEVER be empty
+ * void save_snapshot();
+ *
+ * Link the current free list & processor local list on an independent list.
*/
+ .align 5
+ .globl EXT(save_snapshot)
-ENTRY(save_queue,TAG_NO_FRAME_USED)
+LEXT(save_snapshot)
+ mflr r9 ; get return address
+ bl saveSetup ; turn translation off, 64-bit on, load many regs
+ bf-- pf64Bitb,save_snapshot32 ; skip if 32-bit processor
+ ; Handle 64-bit processor.
- mfsprg r9,2 ; Get the feature flags
- mr r11,r3 ; Save the block
- mtcrf 0x04,r9 ; Set the features
- mfmsr r12 ; Get the MSR
- lis r10,HIGH_ADDR(EXT(saveanchor)) ; Get the high part of the anchor
- andi. r3,r12,0x7FCF ; Turn off all translation and rupts
- ori r10,r10,LOW_ADDR(EXT(saveanchor)) ; Bottom half of the anchor
+save_snapshot64:
- bt pfNoMSRirb,sqNoMSR ; No MSR...
+ ld r8,next_savearea(r10) ; Start with the current savearea
+ std r8,SVsavefreesnapshot(0) ; Make it the restore list anchor
+ ld r5,SVfree(0) ; Get free save area list anchor
- mtmsr r3 ; Translation and all off
- isync ; Toss prefetch
- b sqNoMSRx
-
-sqNoMSR: li r0,loadMSR ; Get the MSR setter SC
- sc ; Set it
-sqNoMSRx:
-
-#if 0
- rlwinm. r3,r11,0,0,19 /* (TEST/DEBUG) */
- bne+ notraceit /* (TEST/DEBUG) */
- BREAKPOINT_TRAP /* (TEST/DEBUG) */
-notraceit: /* (TEST/DEBUG) */
-#else
- rlwinm r3,r11,0,0,19 /* Make sure it's clean and tidy */
-#endif
+save_snapshot64nextfree:
+ mr r7,r5
+ std r7,savemisc1(r8) ; Link this one
+ ld r5,SAVprev(r7) ; Get the next
+ mr r8,r7
+ mr. r0,r5
+ bne save_snapshot64nextfree
+
+ lwz r6,SVinuse(0) ; Get inuse count
+ ld r5,lclfree(r10) ; Get the local savearea list
+ subi r6,r6,1 ; Count the first as free
+
+save_snapshot64nextlocalfree:
+ subi r6,r6,1 ; Count as free
+ mr r7,r5
+ std r7,savemisc1(r8) ; Link this one
+ ld r5,SAVprev(r7) ; Get the next
+ mr r8,r7
+ mr. r0,r5
+ bne save_snapshot64nextlocalfree
+
+ std r5,savemisc1(r8) ; End the list
+ stw r6,SVsaveinusesnapshot(0) ; Save the new number of inuse saveareas
+
+ mtlr r9 ; Restore the return
+ b saveRestore64 ; Restore interrupts and translation
+
+ ; Handle 32-bit processor.
+
+save_snapshot32:
+ lwz r8,next_savearea+4(r10) ; Start with the current savearea
+ stw r8,SVsavefreesnapshot+4(0) ; Make it the restore list anchor
+ lwz r5,SVfree+4(0) ; Get free save area list anchor
+
+save_snapshot32nextfree:
+ mr r7,r5
+ stw r7,savemisc1+4(r8) ; Link this one
+ lwz r5,SAVprev+4(r7) ; Get the next
+ mr r8,r7
+ mr. r0,r5
+ bne save_snapshot32nextfree
+
+ lwz r6,SVinuse(0) ; Get inuse count
+ lwz r5,lclfree+4(r10) ; Get the local savearea list
+ subi r6,r6,1 ; Count the first as free
+
+save_snapshot32nextlocalfree:
+ subi r6,r6,1 ; Count as free
+ mr r7,r5
+ stw r7,savemisc1+4(r8) ; Link this one
+ lwz r5,SAVprev+4(r7) ; Get the next
+ mr r8,r7
+ mr. r0,r5
+ bne save_snapshot32nextlocalfree
+
+ stw r5,savemisc1+4(r8) ; End the list
+ stw r6,SVsaveinusesnapshot(0) ; Save the new number of inuse saveareas
+
+ mtlr r9 ; Restore the return
+ b saveRestore32 ; Restore interrupts and translation
+
+/*
+ * *********************************************
+ * * s a v e _ s n a p s h o t _ r e s t o r e *
+ * *********************************************
+ *
+ * void save_snapshot_restore();
+ *
+ * Restore the free list from the snapshot list, and reset the processors next savearea.
+ */
+ .align 5
+ .globl EXT(save_snapshot_restore)
+
+LEXT(save_snapshot_restore)
+ mflr r9 ; get return address
+ bl saveSetup ; turn translation off, 64-bit on, load many regs
+ bf-- pf64Bitb,save_snapshot_restore32 ; skip if 32-bit processor
+
+ ; Handle 64-bit processor.
+
+save_snapshot_restore64:
+ lwz r7,SVsaveinusesnapshot(0)
+ stw r7,SVinuse(0) ; Set the new inuse count
+
+ li r6,0
+ stw r6,lclfreecnt(r10) ; None local now
+ std r6,lclfree(r10) ; None local now
+
+ ld r8,SVsavefreesnapshot(0) ; Get the restore list anchor
+ std r8,SVfree(0) ; Make it the free list anchor
+ li r5,SAVempty ; Get marker for free savearea
-sqlck: lwarx r9,0,r10 /* Grab the lock value */
- li r8,1 /* Use part of the delay time */
- mr. r9,r9 /* Is it locked? */
- bne- sqlcks /* Yeah, wait for it to clear... */
- stwcx. r8,0,r10 /* Try to seize that there durn lock */
- beq+ sqlckd /* Got it... */
- b sqlck /* Collision, try again... */
-
-sqlcks: lwz r9,SVlock(r10) /* Get that lock in here */
- mr. r9,r9 /* Is it free yet? */
- beq+ sqlck /* Yeah, try for it again... */
- b sqlcks /* Sniff away... */
-
-sqlckd: isync /* Make sure translation is off */
- lwz r7,SVfree(r10) /* Get the free save area list anchor */
- lwz r6,SVcount(r10) /* Get the total count of saveareas */
- stw r3,SVfree(r10) /* Queue in the new one */
- addi r6,r6,sac_cnt /* Count the ones we are linking in */
- stw r7,SACnext(r3) /* Queue the old first one off of us */
- li r8,0 /* Get a free lock value */
- stw r6,SVcount(r10) /* Save the new count */
-
- sync /* Make sure everything is done */
- stw r8,SVlock(r10) /* Unlock the savearea chain */
-
- mtmsr r12 /* Restore interrupts and translation */
- isync /* Dump any speculations */
-
-#if 0
- lis r0,HIGH_ADDR(CutTrace) /* (TEST/DEBUG) */
+save_snapshot_restore64nextfree:
+ addi r6,r6,1 ; Count as free
+ stb r5,SAVflags+2(r8) ; Mark savearea free
+ ld r7,savemisc1(r8) ; Get the next
+ std r7,SAVprev(r8) ; Set the next in free list
+ mr. r8,r7
+ bne save_snapshot_restore64nextfree
+
+ stw r6,SVfreecnt(0) ; Set the new free count
+
+ bl saveGet64
+ std r3,next_savearea(r10) ; Get the next savearea
+
+ mtlr r9 ; Restore the return
+ b saveRestore64 ; Restore interrupts and translation
+
+ ; Handle 32-bit processor.
+
+save_snapshot_restore32:
+ lwz r7,SVsaveinusesnapshot(0)
+ stw r7,SVinuse(0) ; Set the new inuse count
+
+ li r6,0
+ stw r6,lclfreecnt(r10) ; None local now
+ stw r6,lclfree+4(r10) ; None local now
+
+ lwz r8,SVsavefreesnapshot+4(0) ; Get the restore list anchor
+ stw r8,SVfree+4(0) ; Make it the free list anchor
+ li r5,SAVempty ; Get marker for free savearea
+
+save_snapshot_restore32nextfree:
+ addi r6,r6,1 ; Count as free
+ stb r5,SAVflags+2(r8) ; Mark savearea free
+ lwz r7,savemisc1+4(r8) ; Get the next
+ stw r7,SAVprev+4(r8) ; Set the next in free list
+ mr. r8,r7
+ bne save_snapshot_restore32nextfree
+
+ stw r6,SVfreecnt(0) ; Set the new free count
+
+ bl saveGet32
+ stw r3,next_savearea+4(r10) ; Get the next savearea
+
+ mtlr r9 ; Restore the return
+ b saveRestore32 ; Restore interrupts and translation
+
+/*
+ * ***********************
+ * * s a v e _ q u e u e *
+ * ***********************
+ *
+ * void save_queue(ppnum_t pagenum);
+ *
+ * This routine will add a savearea block to the free list.
+ * We also queue the block to the free pool list. This is a
+ * circular double linked list. Because this block has no free entries,
+ * it gets queued to the end of the list
+ */
+ .align 5
+ .globl EXT(save_queue)
+
+LEXT(save_queue)
+ mflr r9 ; get return address
+ mr r8,r3 ; move pagenum out of the way
+ bl saveSetup ; turn translation off, 64-bit on, load many regs
+ bf-- pf64Bitb,saveQueue32 ; skip if 32-bit processor
+
+ sldi r2,r8,12 ; r2 <-- phys address of page
+ li r8,sac_cnt ; Get the number of saveareas per page
+ mr r4,r2 ; Point to start of chain
+ li r0,SAVempty ; Get empty marker
+
+saveQueue64a:
+ addic. r8,r8,-1 ; Keep track of how many we did
+ stb r0,SAVflags+2(r4) ; Set empty
+ addi r7,r4,SAVsize ; Point to the next slot
+ ble- saveQueue64b ; We are done with the chain
+ std r7,SAVprev(r4) ; Set this chain
+ mr r4,r7 ; Step to the next
+ b saveQueue64a ; Fill the whole block...
+
+saveQueue64b:
+ bl savelock ; Go lock the save anchor
+
+ ld r7,SVfree(0) ; Get the free save area list anchor
+ lwz r6,SVfreecnt(0) ; Get the number of free saveareas
+
+ std r2,SVfree(0) ; Queue in the new one
+ addi r6,r6,sac_cnt ; Count the ones we are linking in
+ std r7,SAVprev(r4) ; Queue the old first one off of us
+ stw r6,SVfreecnt(0) ; Save the new count
+ b saveQueueExit
+
+ ; Handle 32-bit processor.
+
+saveQueue32:
+ slwi r2,r8,12 ; r2 <-- phys address of page
+ li r8,sac_cnt ; Get the number of saveareas per page
+ mr r4,r2 ; Point to start of chain
+ li r0,SAVempty ; Get empty marker
+
+saveQueue32a:
+ addic. r8,r8,-1 ; Keep track of how many we did
+ stb r0,SAVflags+2(r4) ; Set empty
+ addi r7,r4,SAVsize ; Point to the next slot
+ ble- saveQueue32b ; We are done with the chain
+ stw r7,SAVprev+4(r4) ; Set this chain
+ mr r4,r7 ; Step to the next
+ b saveQueue32a ; Fill the whole block...
+
+saveQueue32b:
+ bl savelock ; Go lock the save anchor
+
+ lwz r7,SVfree+4(0) ; Get the free save area list anchor
+ lwz r6,SVfreecnt(0) ; Get the number of free saveareas
+
+ stw r2,SVfree+4(0) ; Queue in the new one
+ addi r6,r6,sac_cnt ; Count the ones we are linking in
+ stw r7,SAVprev+4(r4) ; Queue the old first one off of us
+ stw r6,SVfreecnt(0) ; Save the new count
+
+saveQueueExit: ; join here from 64-bit path
+ bl saveunlock ; Unlock the list and set the adjust count
+ mtlr r9 ; Restore the return
+
+#if FPVECDBG
+ mfsprg r2,1 ; (TEST/DEBUG)
+ mr. r2,r2 ; (TEST/DEBUG)
+ beq-- saveRestore ; (TEST/DEBUG)
+ lis r0,hi16(CutTrace) ; (TEST/DEBUG)
li r2,0x2201 ; (TEST/DEBUG)
- oris r0,r0,LOW_ADDR(CutTrace) /* (TEST/DEBUG) */
- sc /* (TEST/DEBUG) */
+ oris r0,r0,lo16(CutTrace) ; (TEST/DEBUG)
+ sc ; (TEST/DEBUG)
#endif
+ b saveRestore ; Restore interrupts and translation
- blr /* Leave... */
+/*
+ * *****************************
+ * * s a v e _ g e t _ i n i t *
+ * *****************************
+ *
+ * addr64_t save_get_init(void);
+ *
+ * Note that save_get_init is used in initial processor startup only. It
+ * is used because translation is on, but no tables exist yet and we have
+ * no V=R BAT registers that cover the entire physical memory.
+ */
+ .align 5
+ .globl EXT(save_get_init)
+LEXT(save_get_init)
+ mflr r9 ; get return address
+ bl saveSetup ; turn translation off, 64-bit on, load many regs
+ bfl-- pf64Bitb,saveGet32 ; Get r3 <- savearea, r5 <- page address (with SAC)
+ btl++ pf64Bitb,saveGet64 ; get one on a 64-bit machine
+ bl saveRestore ; restore translation etc
+ mtlr r9
+
+ ; unpack the physaddr in r3 into a long long in (r3,r4)
+
+ mr r4,r3 ; copy low word of phys address to r4
+ li r3,0 ; assume upper word was 0
+ bflr-- pf64Bitb ; if 32-bit processor, return
+ srdi r3,r4,32 ; unpack reg64_t to addr64_t on 64-bit machine
+ rlwinm r4,r4,0,0,31
+ blr
+
/*
- * This routine will find and remove an empty savearea block from the free list.
- * Note really well: we can take NO exceptions of any kind,
- * including a PTE miss once the savearea lock is held. That's
- * a guaranteed deadlock. That means we must disable for interrutions
- * and turn all translation off.
+ * *******************
+ * * s a v e _ g e t *
+ * *******************
*
- * We pass back the virtual address of the one we just released
- * or a zero if none to free.
+ * savearea *save_get(void);
*
- * Note that the savearea list should NEVER be empty
+ * Allocate a savearea, returning a virtual address. NOTE: we must preserve
+ * r0, r2, and r12. Our callers in cswtch.s depend on this.
*/
+ .align 5
+ .globl EXT(save_get)
-ENTRY(save_dequeue,TAG_NO_FRAME_USED)
-
-
- mfsprg r9,2 ; Get the feature flags
- mfmsr r12 /* Get the MSR */
- mtcrf 0x04,r9 ; Set the features
- lis r10,HIGH_ADDR(EXT(saveanchor)) /* Get the high part of the anchor */
- andi. r3,r12,0x7FCF /* Turn off all translation and 'rupts */
- ori r10,r10,LOW_ADDR(EXT(saveanchor)) /* Bottom half of the anchor */
-
- bt pfNoMSRirb,sdNoMSR ; No MSR...
-
- mtmsr r3 ; Translation and all off
- isync ; Toss prefetch
- b sdNoMSRx
-
-sdNoMSR: li r0,loadMSR ; Get the MSR setter SC
- sc ; Set it
-sdNoMSRx:
-
-sdqlck: lwarx r9,0,r10 /* Grab the lock value */
- li r8,1 /* Use part of the delay time */
- mr. r9,r9 /* Is it locked? */
- bne- sdqlcks /* Yeah, wait for it to clear... */
- stwcx. r8,0,r10 /* Try to seize that there durn lock */
- beq+ sdqlckd /* Got it... */
- b sdqlck /* Collision, try again... */
-
-sdqlcks: lwz r9,SVlock(r10) /* Get that lock in here */
- mr. r9,r9 /* Is it free yet? */
- beq+ sdqlck /* Yeah, try for it again... */
- b sdqlcks /* Sniff away... */
-
-
-sdqlckd: isync ; Clean out the prefetches
- lwz r3,SVfree(r10) /* Get the free save area list anchor */
- la r5,SVfree(r10) /* Remember that the we're just starting out */
- lwz r6,SVcount(r10) /* Get the total count of saveareas for later */
- lis r8,sac_empty>>16 /* Get the empty block indication */
-
-sdqchk: lwz r4,SACalloc(r3) /* Get the allocation flags */
- lwz r9,SACflags(r3) /* Get the flags */
- lwz r7,SACnext(r3) /* Point on to the next one */
- andis. r9,r9,hi16(sac_perm) /* Is this permanently allocated? */
- cmplw cr1,r4,r8 /* Does this look empty? */
- bne- sdqperm /* It's permanent, can't release... */
- beq- cr1,sdqfnd /* Yeah, empty... */
-
-sdqperm: la r5,SACnext(r3) /* Remember the last guy */
- mr. r3,r7 /* Any more left? */
- bne+ sdqchk /* Yeah... */
- b sdqunlk /* Nope, just go unlock and leave... */
-
-sdqfnd: subi r6,r6,sac_cnt /* Back off the number of saveareas in here */
- stw r7,0(r5) /* Dequeue our guy */
- lwz r9,SACvrswap(r3) /* Get addressing conversion */
- stw r6,SVcount(r10) /* Back off the count for this block */
- xor r3,r3,r9 /* Flip to virtual addressing */
-
-sdqunlk: li r8,0 /* Get a free lock value */
- sync /* Make sure everything is done */
- stw r8,SVlock(r10) /* Unlock the savearea chain */
-
- mtmsr r12 /* Restore interrupts and translation */
- isync /* Dump any speculations */
-
-#if 0
- lis r0,HIGH_ADDR(CutTrace) /* (TEST/DEBUG) */
- li r2,0x2202 ; (TEST/DEBUG)
- oris r0,r0,LOW_ADDR(CutTrace) /* (TEST/DEBUG) */
- sc /* (TEST/DEBUG) */
-#endif
+LEXT(save_get)
+ mflr r9 ; get return address
+ mr r5,r0 ; copy regs before saveSetup nails them
+ bl saveSetup ; turn translation off, 64-bit on, load many regs
+ bf-- pf64Bitb,svgt1 ; skip if 32-bit processor
+
+ std r5,tempr0(r10) ; save r0 in per-proc across call to saveGet64
+ std r2,tempr2(r10) ; and r2
+ std r12,tempr4(r10) ; and r12
+ bl saveGet64 ; get r3 <- savearea, r5 <- page address (with SAC)
+ ld r0,tempr0(r10) ; restore callers regs
+ ld r2,tempr2(r10)
+ ld r12,tempr4(r10)
+ b svgt2
+
+svgt1: ; handle 32-bit processor
+ stw r5,tempr0+4(r10) ; save r0 in per-proc across call to saveGet32
+ stw r2,tempr2+4(r10) ; and r2
+ stw r12,tempr4+4(r10) ; and r12
+ bl saveGet32 ; get r3 <- savearea, r5 <- page address (with SAC)
+ lwz r0,tempr0+4(r10) ; restore callers regs
+ lwz r2,tempr2+4(r10)
+ lwz r12,tempr4+4(r10)
+
+svgt2:
+ lwz r5,SACvrswap+4(r5) ; Get the virtual to real translation (only need low word)
+ mtlr r9 ; restore return address
+ xor r3,r3,r5 ; convert physaddr to virtual
+ rlwinm r3,r3,0,0,31 ; 0 upper word if a 64-bit machine
- blr /* Leave... */
+#if FPVECDBG
+ mr r6,r0 ; (TEST/DEBUG)
+ mr r7,r2 ; (TEST/DEBUG)
+ mfsprg r2,1 ; (TEST/DEBUG)
+ mr. r2,r2 ; (TEST/DEBUG)
+ beq-- svgDBBypass ; (TEST/DEBUG)
+ lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG)
+ li r2,0x2203 ; (TEST/DEBUG)
+ oris r0,r0,LOW_ADDR(CutTrace) ; (TEST/DEBUG)
+ sc ; (TEST/DEBUG)
+svgDBBypass: ; (TEST/DEBUG)
+ mr r0,r6 ; (TEST/DEBUG)
+ mr r2,r7 ; (TEST/DEBUG)
+#endif
+ b saveRestore ; restore MSR and return to our caller
+
+
+/*
+ * ***********************************
+ * * s a v e _ g e t _ p h y s _ 3 2 *
+ * ***********************************
+ *
+ * reg64_t save_get_phys(void);
+ *
+ * This is the entry normally called from lowmem_vectors.s with
+ * translation and interrupts already off.
+ * MUST NOT TOUCH CR7
+ */
+ .align 5
+ .globl EXT(save_get_phys_32)
+LEXT(save_get_phys_32)
+ mfsprg r10,0 ; get the per-proc ptr
+ b saveGet32 ; Get r3 <- savearea, r5 <- page address (with SAC)
/*
- * This routine will obtain a savearea from the free list.
- * Note really well: we can take NO exceptions of any kind,
- * including a PTE miss once the savearea lock is held. That's
- * a guaranteed deadlock. That means we must disable for interrutions
- * and turn all translation off.
+ * ***********************************
+ * * s a v e _ g e t _ p h y s _ 6 4 *
+ * ***********************************
*
- * We pass back the virtual address of the one we just obtained
- * or a zero if none to allocate.
+ * reg64_t save_get_phys_64(void);
*
- * Note that the savearea list should NEVER be empty
- * NOTE!!! NEVER USE R0, R2, or R12 IN HERE THAT WAY WE DON'T NEED A
- * STACK FRAME IN FPU_SAVE, FPU_SWITCH, VEC_SAVE, OR VEC_SWITCH.
+ * This is the entry normally called from lowmem_vectors.s with
+ * translation and interrupts already off, and in 64-bit mode.
+ * MUST NOT TOUCH CR7
*/
+ .align 5
+ .globl EXT(save_get_phys_64)
+
+LEXT(save_get_phys_64)
+ mfsprg r10,0 ; get the per-proc ptr
+ b saveGet64 ; Get r3 <- savearea, r5 <- page address (with SAC)
+
-ENTRY(save_get_phys,TAG_NO_FRAME_USED)
+/*
+ * *********************
+ * * s a v e G e t 6 4 *
+ * *********************
+ *
+ * This is the internal routine to allocate a savearea on a 64-bit processor.
+ * Note that we must not take any exceptions of any kind, including PTE misses, as that
+ * would deadlock trying to reenter this routine. We pass back the 64-bit physical address.
+ * First we try the local list. If that is below a threshold, we try the global free list,
+ * which requires taking a lock, and replenish. If there are no saveareas in either list,
+ * we will install the backpocket and choke. This routine assumes that the caller has
+ * turned translation off, masked interrupts, turned on 64-bit mode, and set up:
+ * r10 = per-proc ptr
+ *
+ * We return:
+ * r3 = 64-bit physical address of the savearea
+ * r5 = 64-bit physical address of the page the savearea is in, with SAC
+ *
+ * We destroy:
+ * r2-r8.
+ *
+ * MUST NOT TOUCH CR7
+ */
+
+saveGet64:
+ lwz r8,lclfreecnt(r10) ; Get the count
+ ld r3,lclfree(r10) ; Get the start of local savearea list
+ cmplwi r8,LocalSaveMin ; Are we too low?
+ ble-- saveGet64GetGlobal ; We are too low and need to grow list...
+
+ ; Get it from the per-processor local list.
+
+saveGet64GetLocal:
+ li r2,0x5555 ; get r2 <-- 0x55555555 55555555, our bugbug constant
+ ld r4,SAVprev(r3) ; Chain to the next one
+ oris r2,r2,0x5555
+ subi r8,r8,1 ; Back down count
+ rldimi r2,r2,32,0
+
+ std r2,SAVprev(r3) ; bug next ptr
+ stw r2,SAVlevel(r3) ; bug context ID
+ li r6,0
+ std r4,lclfree(r10) ; Unchain first savearea
+ stw r2,SAVact(r3) ; bug activation ptr
+ rldicr r5,r3,0,51 ; r5 <-- page ptr, where SAC is kept
+ stw r8,lclfreecnt(r10) ; Set new count
+ stw r6,SAVflags(r3) ; clear the flags
+
+ blr
+
+ ; Local list was low so replenish from global list.
+ ; r7 = return address to caller of saveGet64
+ ; r8 = lclfreecnt
+ ; r10 = per-proc ptr
+
+saveGet64GetGlobal:
+ mflr r7 ; save return adress
+ subfic r5,r8,LocalSaveTarget ; Get the number of saveareas we need to grab to get to target
+ bl savelock ; Go lock up the anchor
+
+ lwz r2,SVfreecnt(0) ; Get the number on this list
+ ld r8,SVfree(0) ; Get the head of the save area list
- cmplw cr1,r1,r1 ; Set CR1_eq to indicate we want physical address
- b csaveget ; Join the common...
+ sub r3,r2,r5 ; Get number left after we swipe enough for local list
+ sradi r3,r3,63 ; Get 0 if enough or -1 if not
+ andc r4,r5,r3 ; Get number to get if there are enough, 0 otherwise
+ and r5,r2,r3 ; Get 0 if there are enough, number on list otherwise
+ or. r5,r4,r5 ; r5 <- number we will move from global to local list
+ beq-- saveGet64NoFree ; There are none to get...
+
+ mtctr r5 ; Get loop count
+ mr r6,r8 ; Remember the first in the list
+
+saveGet64c:
+ bdz saveGet64d ; Count down and branch when we hit 0...
+ ld r8,SAVprev(r8) ; Get the next
+ b saveGet64c ; Keep going...
-ENTRY(save_get,TAG_NO_FRAME_USED)
+saveGet64d:
+ ld r3,SAVprev(r8) ; Get the next one
+ lwz r4,SVinuse(0) ; Get the in use count
+ sub r2,r2,r5 ; Count down what we stole
+ std r3,SVfree(0) ; Set the new first in list
+ add r4,r4,r5 ; Count the ones we just put in the local list as "in use"
+ stw r2,SVfreecnt(0) ; Set the new count
+ stw r4,SVinuse(0) ; Set the new in use count
- cmplwi cr1,r1,0 ; Set CR1_ne to indicate we want virtual address
+ ld r4,lclfree(r10) ; Get the old head of list
+ lwz r3,lclfreecnt(r10) ; Get the old count
+ std r6,lclfree(r10) ; Set the new head of the list
+ add r3,r3,r5 ; Get the new count
+ std r4,SAVprev(r8) ; Point to the old head
+ stw r3,lclfreecnt(r10) ; Set the new count
-csaveget: mfsprg r9,2 ; Get the feature flags
- mfmsr r11 ; Get the MSR
- mtcrf 0x04,r9 ; Set the features
- lis r10,HIGH_ADDR(EXT(saveanchor)) /* Get the high part of the anchor */
- andi. r3,r11,0x7FCF /* Turn off all translation and 'rupts */
- ori r10,r10,LOW_ADDR(EXT(saveanchor)) /* Bottom half of the anchor */
+ bl saveunlock ; Update the adjust field and unlock
+ mtlr r7 ; restore return address
+ b saveGet64 ; Start over and finally allocate the savearea...
+
+ ; The local list is below the repopulate threshold and the global list is empty.
+ ; First we check if there are any left in the local list and if so, we allow
+ ; them to be allocated. If not, we release the backpocket list and choke.
+ ; There is nothing more that we can do at this point. Hopefully we stay alive
+ ; long enough to grab some much-needed panic information.
+ ; r7 = return address to caller of saveGet64
+ ; r10 = per-proc ptr
- bt pfNoMSRirb,sgNoMSR ; No MSR...
+saveGet64NoFree:
+ lwz r8,lclfreecnt(r10) ; Get the count
+ mr. r8,r8 ; Are there any reserve to get?
+ beq-- saveGet64Choke ; No, go choke and die...
+ bl saveunlock ; Update the adjust field and unlock
+ ld r3,lclfree(r10) ; Get the start of local savearea list
+ lwz r8,lclfreecnt(r10) ; Get the count
+ mtlr r7 ; restore return address
+ b saveGet64GetLocal ; We have some left, dip on in...
+
+; We who are about to die salute you. The savearea chain is messed up or
+; empty. Add in a few so we have enough to take down the system.
- mtmsr r3 ; Translation and all off
- isync ; Toss prefetch
- b sgNoMSRx
+saveGet64Choke:
+ lis r9,hi16(EXT(backpocket)) ; Get high order of back pocket
+ ori r9,r9,lo16(EXT(backpocket)) ; and low part
-sgNoMSR: mr r9,r0 ; Save this
- li r0,loadMSR ; Get the MSR setter SC
- sc ; Set it
- mr r0,r9 ; Restore it
+ lwz r8,SVfreecnt-saveanchor(r9) ; Get the new number of free elements
+ ld r7,SVfree-saveanchor(r9) ; Get the head of the chain
+ lwz r6,SVinuse(0) ; Get total in the old list
+
+ stw r8,SVfreecnt(0) ; Set the new number of free elements
+ add r6,r6,r8 ; Add in the new ones
+ std r7,SVfree(0) ; Set the new head of the chain
+ stw r6,SVinuse(0) ; Set total in the new list
-sgNoMSRx:
+saveGetChokeJoin: ; join in the fun from 32-bit mode
+ lis r0,hi16(Choke) ; Set choke firmware call
+ li r7,0 ; Get a clear register to unlock
+ ori r0,r0,lo16(Choke) ; Set the rest of the choke call
+ li r3,failNoSavearea ; Set failure code
-sglck: lwarx r9,0,r10 /* Grab the lock value */
- li r7,1 /* Use part of the delay time */
- mr. r9,r9 /* Is it locked? */
- bne- sglcks /* Yeah, wait for it to clear... */
- stwcx. r7,0,r10 /* Try to seize that there durn lock */
- beq+ sglckd /* Got it... */
- b sglck /* Collision, try again... */
+ eieio ; Make sure all is committed
+ stw r7,SVlock(0) ; Unlock the free list
+ sc ; System ABEND
+
+
+/*
+ * *********************
+ * * s a v e G e t 3 2 *
+ * *********************
+ *
+ * This is the internal routine to allocate a savearea on a 32-bit processor.
+ * Note that we must not take any exceptions of any kind, including PTE misses, as that
+ * would deadlock trying to reenter this routine. We pass back the 32-bit physical address.
+ * First we try the local list. If that is below a threshold, we try the global free list,
+ * which requires taking a lock, and replenish. If there are no saveareas in either list,
+ * we will install the backpocket and choke. This routine assumes that the caller has
+ * turned translation off, masked interrupts, and set up:
+ * r10 = per-proc ptr
+ *
+ * We return:
+ * r3 = 32-bit physical address of the savearea
+ * r5 = 32-bit physical address of the page the savearea is in, with SAC
+ *
+ * We destroy:
+ * r2-r8.
+ */
+
+saveGet32:
+ lwz r8,lclfreecnt(r10) ; Get the count
+ lwz r3,lclfree+4(r10) ; Get the start of local savearea list
+ cmplwi r8,LocalSaveMin ; Are we too low?
+ ble- saveGet32GetGlobal ; We are too low and need to grow list...
+
+ ; Get savearea from per-processor local list.
+
+saveGet32GetLocal:
+ li r2,0x5555 ; get r2 <-- 0x55555555, our bugbug constant
+ lwz r4,SAVprev+4(r3) ; Chain to the next one
+ oris r2,r2,0x5555
+ subi r8,r8,1 ; Back down count
+
+ stw r2,SAVprev+4(r3) ; bug next ptr
+ stw r2,SAVlevel(r3) ; bug context ID
+ li r6,0
+ stw r4,lclfree+4(r10) ; Unchain first savearea
+ stw r2,SAVact(r3) ; bug activation ptr
+ rlwinm r5,r3,0,0,19 ; r5 <-- page ptr, where SAC is kept
+ stw r8,lclfreecnt(r10) ; Set new count
+ stw r6,SAVflags(r3) ; clear the flags
+
+ blr
+
+ ; Local list was low so replenish from global list.
+ ; r7 = return address to caller of saveGet32
+ ; r8 = lclfreecnt
+ ; r10 = per-proc ptr
+
+saveGet32GetGlobal:
+ mflr r7 ; save return adress
+ subfic r5,r8,LocalSaveTarget ; Get the number of saveareas we need to grab to get to target
+ bl savelock ; Go lock up the anchor
+
+ lwz r2,SVfreecnt(0) ; Get the number on this list
+ lwz r8,SVfree+4(0) ; Get the head of the save area list
-sglcks: lwz r9,SVlock(r10) /* Get that lock in here */
- mr. r9,r9 /* Is it free yet? */
- beq+ sglck /* Yeah, try for it again... */
- b sglcks /* Sniff away... */
+ sub r3,r2,r5 ; Get number left after we swipe enough for local list
+ srawi r3,r3,31 ; Get 0 if enough or -1 if not
+ andc r4,r5,r3 ; Get number to get if there are enough, 0 otherwise
+ and r5,r2,r3 ; Get 0 if there are enough, number on list otherwise
+ or. r5,r4,r5 ; r5 <- number we will move from global to local list
+ beq- saveGet32NoFree ; There are none to get...
-sglckd: isync /* Make sure translation is off */
- lwz r8,SVfree(r10) /* Get the head of the save area list */
- lwz r9,SVinuse(r10) /* Get the inuse field */
+ mtctr r5 ; Get loop count
+ mr r6,r8 ; Remember the first in the list
- lwz r7,SACalloc(r8) /* Pick up the allocation bits */
- lwz r5,SACvrswap(r8) /* Get real to virtual translation */
- mr. r7,r7 /* Can we use the first one? */
- blt use1st /* Yeah... */
+saveGet32c:
+ bdz saveGet32d ; Count down and branch when we hit 0...
+ lwz r8,SAVprev+4(r8) ; Get the next
+ b saveGet32c ; Keep going...
+
+saveGet32d:
+ lwz r3,SAVprev+4(r8) ; Get the next one
+ lwz r4,SVinuse(0) ; Get the in use count
+ sub r2,r2,r5 ; Count down what we stole
+ stw r3,SVfree+4(0) ; Set the new first in list
+ add r4,r4,r5 ; Count the ones we just put in the local list as "in use"
+ stw r2,SVfreecnt(0) ; Set the new count
+ stw r4,SVinuse(0) ; Set the new in use count
- andis. r7,r7,0x8000 /* Show we used the second and remember if it was the last */
- addi r3,r8,0x0800 /* Point to the first one */
- b gotsave /* We have the area now... */
+ lwz r4,lclfree+4(r10) ; Get the old head of list
+ lwz r3,lclfreecnt(r10) ; Get the old count
+ stw r6,lclfree+4(r10) ; Set the new head of the list
+ add r3,r3,r5 ; Get the new count
+ stw r4,SAVprev+4(r8) ; Point to the old head
+ stw r3,lclfreecnt(r10) ; Set the new count
-use1st: andis. r7,r7,0x4000 /* Mark first gone and remember if empty */
- mr r3,r8 /* Set the save area */
+ bl saveunlock ; Update the adjust field and unlock
+ mtlr r7 ; restore return address
+ b saveGet32 ; Start over and finally allocate the savearea...
-gotsave: stw r7,SACalloc(r8) /* Put back the allocation bits */
- bne nodqsave /* There's still an empty slot, don't dequeue... */
+ ; The local list is below the repopulate threshold and the global list is empty.
+ ; First we check if there are any left in the local list and if so, we allow
+ ; them to be allocated. If not, we release the backpocket list and choke.
+ ; There is nothing more that we can do at this point. Hopefully we stay alive
+ ; long enough to grab some much-needed panic information.
+ ; r7 = return address to caller of saveGet32
+ ; r10 = per-proc ptr
- lwz r4,SACnext(r8) /* Get the next in line */
- stw r4,SVfree(r10) /* Dequeue our now empty save area block */
+saveGet32NoFree:
+ lwz r8,lclfreecnt(r10) ; Get the count
+ mr. r8,r8 ; Are there any reserve to get?
+ beq- saveGet32Choke ; No, go choke and die...
+ bl saveunlock ; Update the adjust field and unlock
+ lwz r3,lclfree+4(r10) ; Get the start of local savearea list
+ lwz r8,lclfreecnt(r10) ; Get the count
+ mtlr r7 ; restore return address
+ b saveGet32GetLocal ; We have some left, dip on in...
-nodqsave: lis r6,HIGH_ADDR(SAVattach) /* Show that it is attached for now */
- li r4,0 /* Clear this for the lock */
- stw r6,SAVflags(r3) /* Set the flags to attached */
- addi r9,r9,1 /* Bump up the inuse count */
- stw r4,SAVprev(r3) /* Make sure that backchain is clear */
- stw r9,SVinuse(r10) /* Set the inuse field */
- sync /* Make sure all stores are done */
- stw r4,SVlock(r10) /* Unlock both save and trace areas */
- mtmsr r11 /* Restore translation and exceptions */
- isync /* Make sure about it */
-
-#if 0
- mr r11,r0 /* (TEST/DEBUG) */
- mr r7,r2 /* (TEST/DEBUG) */
- lis r0,HIGH_ADDR(CutTrace) /* (TEST/DEBUG) */
- li r2,0x2203 ; (TEST/DEBUG)
- oris r0,r0,LOW_ADDR(CutTrace) /* (TEST/DEBUG) */
- sc /* (TEST/DEBUG) */
- mr r0,r11 /* (TEST/DEBUG) */
- mr r2,r7 /* (TEST/DEBUG) */
-#endif
+; We who are about to die salute you. The savearea chain is messed up or
+; empty. Add in a few so we have enough to take down the system.
+
+saveGet32Choke:
+ lis r9,hi16(EXT(backpocket)) ; Get high order of back pocket
+ ori r9,r9,lo16(EXT(backpocket)) ; and low part
- li r7,0 ; NOTE WELL: we set R7 to zero for vector and float saving code in cswtch.s
- beqlr- cr1 ; Return now if we want the physical address
- xor r3,r3,r5 /* Get the virtual address */
- blr /* Leave... */
-
+ lwz r8,SVfreecnt-saveanchor(r9) ; Get the new number of free elements
+ lwz r7,SVfree+4-saveanchor(r9) ; Get the head of the chain
+ lwz r6,SVinuse(0) ; Get total in the old list
+
+ stw r8,SVfreecnt(0) ; Set the new number of free elements
+ add r6,r6,r8 ; Add in the new ones (why?)
+ stw r7,SVfree+4(0) ; Set the new head of the chain
+ stw r6,SVinuse(0) ; Set total in the new list
+
+ b saveGetChokeJoin
+
/*
- * This routine will return a savearea to the free list.
+ * *******************
+ * * s a v e _ r e t *
+ * *******************
+ *
+ * void save_ret(struct savearea *); // normal call
+ * void save_ret_wMSR(struct savearea *,reg64_t); // passes MSR to restore as 2nd arg
+ *
+ * Return a savearea passed by virtual address to the free list.
* Note really well: we can take NO exceptions of any kind,
* including a PTE miss once the savearea lock is held. That's
* a guaranteed deadlock. That means we must disable for interrutions
* and turn all translation off.
+ */
+ .globl EXT(save_ret_wMSR) ; alternate entry pt w MSR to restore in r4
+
+LEXT(save_ret_wMSR)
+ crset 31 ; set flag for save_ret_wMSR
+ b svrt1 ; join common code
+
+ .align 5
+ .globl EXT(save_ret)
+
+LEXT(save_ret)
+ crclr 31 ; clear flag for save_ret_wMSR
+svrt1: ; join from save_ret_wMSR
+ mflr r9 ; get return address
+ rlwinm r7,r3,0,0,19 ; get virtual address of SAC area at start of page
+ mr r8,r3 ; save virtual address
+ lwz r5,SACvrswap+0(r7) ; get 64-bit converter from V to R
+ lwz r6,SACvrswap+4(r7) ; both halves, though only bottom used on 32-bit machine
+#if FPVECDBG
+ lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG)
+ li r2,0x2204 ; (TEST/DEBUG)
+ oris r0,r0,LOW_ADDR(CutTrace) ; (TEST/DEBUG)
+ sc ; (TEST/DEBUG)
+#endif
+ bl saveSetup ; turn translation off, 64-bit on, load many regs
+ bf++ 31,svrt3 ; skip if not save_ret_wMSR
+ mr r11,r4 ; was save_ret_wMSR, so overwrite saved MSR
+svrt3:
+ bf-- pf64Bitb,svrt4 ; skip if a 32-bit processor
+
+ ; Handle 64-bit processor.
+
+ rldimi r6,r5,32,0 ; merge upper and lower halves of SACvrswap together
+ xor r3,r8,r6 ; get r3 <- 64-bit physical address of this savearea
+ bl saveRet64 ; return it
+ mtlr r9 ; restore return address
+ b saveRestore64 ; restore MSR
+
+ ; Handle 32-bit processor.
+
+svrt4:
+ xor r3,r8,r6 ; get r3 <- 32-bit physical address of this savearea
+ bl saveRet32 ; return it
+ mtlr r9 ; restore return address
+ b saveRestore32 ; restore MSR
+
+
+/*
+ * *****************************
+ * * s a v e _ r e t _ p h y s *
+ * *****************************
*
- * We take a virtual address.
+ * void save_ret_phys(reg64_t);
*
+ * Called from lowmem vectors to return (ie, free) a savearea by physical address.
+ * Translation and interrupts are already off, and 64-bit mode is set if defined.
+ * We can take _no_ exceptions of any kind in this code, including PTE miss, since
+ * that would result in a deadlock. We expect:
+ * r3 = phys addr of savearea
+ * msr = IR, DR, and EE off, SF on
+ * cr6 = pf64Bit flag
+ * We destroy:
+ * r0,r2-r10.
*/
+ .align 5
+ .globl EXT(save_ret_phys)
-ENTRY(save_ret,TAG_NO_FRAME_USED)
+LEXT(save_ret_phys)
+ mfsprg r10,0 ; get the per-proc ptr
+ bf-- pf64Bitb,saveRet32 ; handle 32-bit machine
+ b saveRet64 ; handle 64-bit machine
+
-#if 0
- cmplwi r3,0x1000 ; (TEST/DEBUG)
- bgt+ notpage0 ; (TEST/DEBUG)
- BREAKPOINT_TRAP /* (TEST/DEBUG) */
+/*
+ * *********************
+ * * s a v e R e t 6 4 *
+ * *********************
+ *
+ * This is the internal routine to free a savearea, passed by 64-bit physical
+ * address. We assume that IR, DR, and EE are all off, that SF is on, and:
+ * r3 = phys address of the savearea
+ * r10 = per-proc ptr
+ * We destroy:
+ * r0,r2-r8.
+ */
+ .align 5
+ saveRet64:
+ li r0,SAVempty ; Get marker for free savearea
+ lwz r7,lclfreecnt(r10) ; Get the local count
+ ld r6,lclfree(r10) ; Get the old local header
+ addi r7,r7,1 ; Pop up the free count
+ std r6,SAVprev(r3) ; Plant free chain pointer
+ cmplwi r7,LocalSaveMax ; Has the list gotten too long?
+ stb r0,SAVflags+2(r3) ; Mark savearea free
+ std r3,lclfree(r10) ; Chain us on in
+ stw r7,lclfreecnt(r10) ; Bump up the count
+ bltlr++ ; List not too long, so done
+
+/* The local savearea chain has gotten too long. Trim it down to the target.
+ * Here's a tricky bit, and important:
+ *
+ * When we trim the list, we NEVER trim the very first one. This is because that is
+ * the very last one released and the exception exit code will release the savearea
+ * BEFORE it is done using it. Wouldn't be too good if another processor started
+ * using it, eh? So for this case, we are safe so long as the savearea stays on
+ * the local list. (Note: the exit routine needs to do this because it is in the
+ * process of restoring all context and it needs to keep it until the last second.)
+ */
-notpage0: rlwinm r6,r3,0,0,19 /* (TEST/DEBUG) */
- rlwinm r7,r3,21,31,31 /* (TEST/DEBUG) */
- lis r8,0x8000 /* (TEST/DEBUG) */
- lwz r6,SACalloc(r6) /* (TEST/DEBUG) */
- srw r8,r8,r7 /* (TEST/DEBUG) */
- and. r8,r8,r6 /* (TEST/DEBUG) */
- beq+ nodoublefret /* (TEST/DEBUG) */
- BREAKPOINT_TRAP /* (TEST/DEBUG) */
+ mflr r0 ; save return to caller of saveRet64
+ mr r2,r3 ; r2 <- 1st one on local list, which must not be trimmed
+ ld r3,SAVprev(r3) ; Skip over the first
+ subi r7,r7,LocalSaveTarget ; Figure out how much to trim
+ mr r6,r3 ; r6 <- first one to trim
+ mr r5,r7 ; Save the number we are trimming
+
+saveRet64a:
+ addic. r7,r7,-1 ; Any left to do?
+ ble-- saveRet64b ; Nope...
+ ld r3,SAVprev(r3) ; Skip to the next one
+ b saveRet64a ; Keep going...
-nodoublefret: /* (TEST/DEBUG) */
+saveRet64b: ; r3 <- last one to trim
+ ld r7,SAVprev(r3) ; Point to the first one not to trim
+ li r4,LocalSaveTarget ; Set the target count
+ std r7,SAVprev(r2) ; Trim stuff leaving the one just released as first
+ stw r4,lclfreecnt(r10) ; Set the current count
+
+ bl savelock ; Lock up the anchor
+
+ ld r8,SVfree(0) ; Get the old head of the free list
+ lwz r4,SVfreecnt(0) ; Get the number of free ones
+ lwz r7,SVinuse(0) ; Get the number that are in use
+ std r6,SVfree(0) ; Point to the first trimmed savearea
+ add r4,r4,r5 ; Add number trimmed to free count
+ std r8,SAVprev(r3) ; Chain the old head to the tail of the trimmed guys
+ sub r7,r7,r5 ; Remove the trims from the in use count
+ stw r4,SVfreecnt(0) ; Set new free count
+ stw r7,SVinuse(0) ; Set new in use count
+
+ mtlr r0 ; Restore the return to our caller
+ b saveunlock ; Set adjust count, unlock the saveanchor, and return
+
+
+/*
+ * *********************
+ * * s a v e R e t 3 2 *
+ * *********************
+ *
+ * This is the internal routine to free a savearea, passed by 32-bit physical
+ * address. We assume that IR, DR, and EE are all off, and:
+ * r3 = phys address of the savearea
+ * r10 = per-proc ptr
+ * We destroy:
+ * r0,r2-r8.
+ */
+ .align 5
+ saveRet32:
+ li r0,SAVempty ; Get marker for free savearea
+ lwz r7,lclfreecnt(r10) ; Get the local count
+ lwz r6,lclfree+4(r10) ; Get the old local header
+ addi r7,r7,1 ; Pop up the free count
+ stw r6,SAVprev+4(r3) ; Plant free chain pointer
+ cmplwi r7,LocalSaveMax ; Has the list gotten too long?
+ stb r0,SAVflags+2(r3) ; Mark savearea free
+ stw r3,lclfree+4(r10) ; Chain us on in
+ stw r7,lclfreecnt(r10) ; Bump up the count
+ bltlr+ ; List not too long, so done
+
+/* The local savearea chain has gotten too long. Trim it down to the target.
+ * Here's a tricky bit, and important:
+ *
+ * When we trim the list, we NEVER trim the very first one. This is because that is
+ * the very last one released and the exception exit code will release the savearea
+ * BEFORE it is done using it. Wouldn't be too good if another processor started
+ * using it, eh? So for this case, we are safe so long as the savearea stays on
+ * the local list. (Note: the exit routine needs to do this because it is in the
+ * process of restoring all context and it needs to keep it until the last second.)
+ */
+
+ mflr r0 ; save return to caller of saveRet32
+ mr r2,r3 ; r2 <- 1st one on local list, which must not be trimmed
+ lwz r3,SAVprev+4(r3) ; Skip over the first
+ subi r7,r7,LocalSaveTarget ; Figure out how much to trim
+ mr r6,r3 ; r6 <- first one to trim
+ mr r5,r7 ; Save the number we are trimming
+
+saveRet32a:
+ addic. r7,r7,-1 ; Any left to do?
+ ble- saveRet32b ; Nope...
+ lwz r3,SAVprev+4(r3) ; Skip to the next one
+ b saveRet32a ; Keep going...
+
+saveRet32b: ; r3 <- last one to trim
+ lwz r7,SAVprev+4(r3) ; Point to the first one not to trim
+ li r4,LocalSaveTarget ; Set the target count
+ stw r7,SAVprev+4(r2) ; Trim stuff leaving the one just released as first
+ stw r4,lclfreecnt(r10) ; Set the current count
+
+ bl savelock ; Lock up the anchor
+
+ lwz r8,SVfree+4(0) ; Get the old head of the free list
+ lwz r4,SVfreecnt(0) ; Get the number of free ones
+ lwz r7,SVinuse(0) ; Get the number that are in use
+ stw r6,SVfree+4(0) ; Point to the first trimmed savearea
+ add r4,r4,r5 ; Add number trimmed to free count
+ stw r8,SAVprev+4(r3) ; Chain the old head to the tail of the trimmed guys
+ sub r7,r7,r5 ; Remove the trims from the in use count
+ stw r4,SVfreecnt(0) ; Set new free count
+ stw r7,SVinuse(0) ; Set new in use count
+
+ mtlr r0 ; Restore the return to our caller
+ b saveunlock ; Set adjust count, unlock the saveanchor, and return
+
+
+/*
+ * *******************************
+ * * s a v e _ t r i m _ f r e e *
+ * *******************************
+ *
+ * struct savearea_comm *save_trim_free(void);
+ *
+ * Trim the free list down to the target count, ie by -(SVadjust) save areas.
+ * It trims the list and, if a pool page was fully allocated, puts that page on
+ * the start of the pool list.
+ *
+ * If the savearea being released is the last on a pool page (i.e., all entries
+ * are released), the page is dequeued from the pool and queued to any other
+ * found during this scan. Note that this queue is maintained virtually.
+ *
+ * When the scan is done, the saveanchor lock is released and the list of
+ * freed pool pages is returned to our caller.
+ *
+ * For latency sake we may want to revisit this code. If we are trimming a
+ * large number of saveareas, we could be disabled and holding the savearea lock
+ * for quite a while. It may be that we want to break the trim down into parts.
+ * Possibly trimming the free list, then individually pushing them into the free pool.
+ *
+ * This function expects to be called with translation on and a valid stack.
+ * It uses the standard ABI, ie we destroy r2 and r3-r11, and return the ptr in r3.
+ */
+ .align 5
+ .globl EXT(save_trim_free)
+
+LEXT(save_trim_free)
+
+ subi r1,r1,(FM_ALIGN(16)+FM_SIZE) ; Make space for 4 registers on stack
+ mflr r9 ; save our return address
+ stw r28,FM_SIZE+0(r1) ; Save R28
+ stw r29,FM_SIZE+4(r1) ; Save R29
+ stw r30,FM_SIZE+8(r1) ; Save R30
+ stw r31,FM_SIZE+12(r1) ; Save R31
+
+ bl saveSetup ; turn off translation and interrupts, load many regs
+ bl savelock ; Go lock up the anchor
+
+ lwz r8,SVadjust(0) ; How many do we need to clear out?
+ li r3,0 ; Get a 0
+ neg. r8,r8 ; Get the actual we need to toss (adjust is neg if too many)
+ ble- save_trim_free1 ; skip if no trimming needed anymore
+ bf-- pf64Bitb,saveTrim32 ; handle 32-bit processors
+ b saveTrim64 ; handle 64-bit processors
+
+save_trim_free1: ; by the time we were called, no need to trim anymore
+ stw r3,SVlock(0) ; Quick unlock (no need for sync or to set adjust, nothing changed)
+ mtlr r9 ; Restore return
+
+#if FPVECDBG
+ lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG)
+ li r2,0x2206 ; (TEST/DEBUG)
+ oris r0,r0,LOW_ADDR(CutTrace) ; (TEST/DEBUG)
+ sc ; (TEST/DEBUG)
#endif
+ addi r1,r1,(FM_ALIGN(16)+FM_SIZE); Pop stack - have not trashed register so no need to reload
+ b saveRestore ; restore translation and EE, turn SF off, return to our caller
- mfsprg r9,2 ; Get the feature flags
- lwz r7,SAVflags(r3) /* Get the flags */
- rlwinm r6,r3,0,0,19 /* Round back down to the savearea page block */
- andis. r7,r7,HIGH_ADDR(SAVinuse) /* Still in use? */
- mfmsr r12 /* Get the MSR */
- bnelr- /* Still in use, just leave... */
- lwz r5,SACvrswap(r6) /* Get the conversion to real */
- mr r8,r3 ; Save the savearea address
- mtcrf 0x04,r9 ; Set the features
- lis r10,HIGH_ADDR(EXT(saveanchor)) /* Get the high part of the anchor */
- andi. r3,r12,0x7FCF /* Turn off all translation and 'rupts */
- ori r10,r10,LOW_ADDR(EXT(saveanchor)) /* Bottom half of the anchor */
-
- bt pfNoMSRirb,srNoMSR ; No MSR...
-
- mtmsr r3 ; Translation and all off
- isync ; Toss prefetch
- b srNoMSRx
-
-srNoMSR: li r0,loadMSR ; Get the MSR setter SC
- sc ; Set it
-srNoMSRx:
-
- mfsprg r11,1 /* Get the active save area */
- xor r3,r8,r5 /* Get the real address of the savearea */
- cmplw r11,r3 /* Are we trying to toss the active one? */
- xor r6,r6,r5 /* Make the savearea block real also */
- beq- srbigtimepanic /* This is a no-no... */
-
- rlwinm r7,r3,21,31,31 /* Get position of savearea in block */
- lis r8,0x8000 /* Build a bit mask and assume first savearea */
- srw r8,r8,r7 /* Get bit position of do deallocate */
-
-srlck: lwarx r11,0,r10 /* Grab the lock value */
- li r7,1 /* Use part of the delay time */
- mr. r11,r11 /* Is it locked? */
- bne- srlcks /* Yeah, wait for it to clear... */
- stwcx. r7,0,r10 /* Try to seize that there durn lock */
- beq+ srlckd /* Got it... */
- b srlck /* Collision, try again... */
-
-srlcks: lwz r11,SVlock(r10) /* Get that lock in here */
- mr. r11,r11 /* Is it free yet? */
- beq+ srlck /* Yeah, try for it again... */
- b srlcks /* Sniff away... */
-
-srlckd: isync /* Toss preexecutions */
- lwz r11,SACalloc(r6) /* Get the allocation for this block */
- lwz r7,SVinuse(r10) /* Get the in use count */
- or r11,r11,r8 /* Turn on our bit */
- subi r7,r7,1 /* We released one, adjust count */
- cmplw r11,r8 /* Is our's the only one free? */
- stw r7,SVinuse(r10) /* Save out count */
- stw r11,SACalloc(r6) /* Save it out */
- bne+ srtrest /* Nope, then the block is already on the free list */
-
- lwz r11,SVfree(r10) /* Get the old head of the free list */
- stw r6,SVfree(r10) /* Point the head at us now */
- stw r11,SACnext(r6) /* Point us at the old last */
-
-srtrest: li r8,0 /* Get set to clear the savearea lock */
- sync /* Make sure it's all out there */
- stw r8,SVlock(r10) /* Unlock it */
- mtmsr r12 /* Restore interruptions and translation */
- isync
-
-#if 0
- lis r0,HIGH_ADDR(CutTrace) /* (TEST/DEBUG) */
- li r2,0x2204 ; (TEST/DEBUG)
- oris r0,r0,LOW_ADDR(CutTrace) /* (TEST/DEBUG) */
- sc /* (TEST/DEBUG) */
+
+/*
+ * ***********************
+ * * s a v e T r i m 3 2 *
+ * ***********************
+ *
+ * Handle "save_trim_free" on 32-bit processors. At this point, translation and interrupts
+ * are off, the savearea anchor is locked, and:
+ * r8 = #pages to trim (>0)
+ * r9 = return address
+ * r10 = per-proc ptr
+ * r11 = MSR at entry
+ */
+
+saveTrim32:
+ lwz r7,SVfree+4(0) ; Get the first on the free list
+ mr r6,r7 ; Save the first one
+ mr r5,r8 ; Save the number we are trimming
+
+sttrimming: addic. r5,r5,-1 ; Any left to do?
+ ble- sttrimmed ; Nope...
+ lwz r7,SAVprev+4(r7) ; Skip to the next one
+ b sttrimming ; Keep going...
+
+sttrimmed: lwz r5,SAVprev+4(r7) ; Get the next one (for new head of free list)
+ lwz r4,SVfreecnt(0) ; Get the free count
+ stw r5,SVfree+4(0) ; Set new head
+ sub r4,r4,r8 ; Calculate the new free count
+ li r31,0 ; Show we have no free pool blocks yet
+ crclr cr1_eq ; dont exit loop before 1st iteration
+ stw r4,SVfreecnt(0) ; Set new free count
+ lis r30,hi16(sac_empty) ; Get what empty looks like
+
+; NOTE: The savearea size must be 640 (0x280). We are doing a divide by shifts and stuff
+; here.
+;
+#if SAVsize != 640
+#error Savearea size is not 640!!!!!!!!!!!!
#endif
- blr /* Go away... */
-
-srbigtimepanic:
- lis r6,HIGH_ADDR(EXT(panic)) /* First half of panic call */
- lis r3,HIGH_ADDR(EXT(srfreeactive)) /* First half of panic string */
- ori r6,r6,LOW_ADDR(EXT(panic)) /* Second half of panic call */
- ori r3,r3,LOW_ADDR(EXT(srfreeactive)) /* Second half of panic string */
- mtlr r6 /* Get the address of the panic routine */
- mtmsr r12 /* Restore interruptions and translation */
- isync
- blrl /* Panic... */
-
- .data
-EXT(srfreeactive):
- STRINGD "save_ret: Attempting to release the active savearea!!!!\000"
- .text
+ ; Loop over each savearea we are trimming.
+ ; r6 = next savearea to trim
+ ; r7 = last savearea to trim
+ ; r8 = #pages to trim (>0)
+ ; r9 = return address
+ ; r10 = per-proc ptr
+ ; r11 = MSR at entry
+ ; r30 = what SACalloc looks like when all saveareas are free
+ ; r31 = free pool block list
+ ; cr1 = beq set if we just trimmed the last, ie if we are done
+
+sttoss: beq+ cr1,stdone ; All done now...
+
+ cmplw cr1,r6,r7 ; Have we finished the loop?
+
+ lis r0,0x0044 ; Get top of table
+ rlwinm r2,r6,0,0,19 ; Back down to the savearea control stuff
+ ori r0,r0,0x2200 ; Finish shift table
+ rlwinm r4,r6,25,27,30 ; Get (addr >> 7) & 0x1E (same as twice high nybble)
+ lwz r5,SACalloc(r2) ; Get the allocation bits
+ addi r4,r4,1 ; Shift 1 extra
+ rlwinm r3,r6,25,31,31 ; Get (addr >> 7) & 1
+ rlwnm r0,r0,r4,29,31 ; Get partial index
+ lis r4,lo16(0x8000) ; Get the bit mask
+ add r0,r0,r3 ; Make the real index
+ srw r4,r4,r0 ; Get the allocation mask
+ or r5,r5,r4 ; Free this entry
+ cmplw r5,r4 ; Is this the only free entry?
+ lwz r6,SAVprev+4(r6) ; Chain to the next trimmed savearea
+ cmplw cr7,r30,r5 ; Does this look empty?
+ stw r5,SACalloc(r2) ; Save back the allocation bits
+ beq- stputpool ; First free entry, go put it into the pool...
+ bne+ cr7,sttoss ; Not an empty block
+
+;
+; We have an empty block. Remove it from the pool list.
+;
+
+ lwz r29,SACflags(r2) ; Get the flags
+ cmplwi cr5,r31,0 ; Is this guy on the release list?
+ lwz r28,SACnext+4(r2) ; Get the forward chain
+
+ rlwinm. r0,r29,0,sac_permb,sac_permb ; Is this a permanently allocated area? (also sets 0 needed below)
+ bne- sttoss ; This is permanent entry, do not try to release...
+
+ lwz r29,SACprev+4(r2) ; and the previous
+ beq- cr5,stnot1st ; Not first
+ lwz r0,SACvrswap+4(r31) ; Load the previous pool page vr conversion
+
+stnot1st: stw r28,SACnext+4(r29) ; Previous guy points to my next
+ xor r0,r0,r31 ; Make the last guy virtual
+ stw r29,SACprev+4(r28) ; Next guy points back to my previous
+ stw r0,SAVprev+4(r2) ; Store the old top virtual as my back chain
+ mr r31,r2 ; My physical is now the head of the chain
+ b sttoss ; Get the next one...
+
+;
+; A pool block that had no free entries now has one. Stick it on the pool list.
+;
+
+stputpool: lwz r28,SVpoolfwd+4(0) ; Get the first guy on the list
+ li r0,saveanchor ; Point to the saveanchor
+ stw r2,SVpoolfwd+4(0) ; Put us on the top of the list
+ stw r28,SACnext+4(r2) ; We point to the old top
+ stw r2,SACprev+4(r28) ; Old top guy points back to us
+ stw r0,SACprev+4(r2) ; Our back points to the anchor
+ b sttoss ; Go on to the next one...
/*
- * struct savearea *save_cpv(struct savearea *); Converts a physical savearea address to virtual
+ * ***********************
+ * * s a v e T r i m 6 4 *
+ * ***********************
+ *
+ * Handle "save_trim_free" on 64-bit processors. At this point, translation and interrupts
+ * are off, SF is on, the savearea anchor is locked, and:
+ * r8 = #pages to trim (>0)
+ * r9 = return address
+ * r10 = per-proc ptr
+ * r11 = MSR at entry
*/
- .align 5
- .globl EXT(save_cpv)
+saveTrim64:
+ ld r7,SVfree(0) ; Get the first on the free list
+ mr r6,r7 ; Save the first one
+ mr r5,r8 ; Save the number we are trimming
+
+sttrimming64:
+ addic. r5,r5,-1 ; Any left to do?
+ ble-- sttrimmed64 ; Nope...
+ ld r7,SAVprev(r7) ; Skip to the next one
+ b sttrimming64 ; Keep going...
-LEXT(save_cpv)
+sttrimmed64:
+ ld r5,SAVprev(r7) ; Get the next one (for new head of free list)
+ lwz r4,SVfreecnt(0) ; Get the free count
+ std r5,SVfree(0) ; Set new head
+ sub r4,r4,r8 ; Calculate the new free count
+ li r31,0 ; Show we have no free pool blocks yet
+ crclr cr1_eq ; dont exit loop before 1st iteration
+ stw r4,SVfreecnt(0) ; Set new free count
+ lis r30,hi16(sac_empty) ; Get what empty looks like
- mfmsr r10 ; Get the current MSR
- rlwinm r4,r3,0,0,19 ; Round back to the start of the physical savearea block
- andi. r9,r10,0x7FEF ; Turn off interrupts and data translation
- mtmsr r9 ; Disable DR and EE
- isync
+
+ ; Loop over each savearea we are trimming.
+ ; r6 = next savearea to trim
+ ; r7 = last savearea to trim
+ ; r8 = #pages to trim (>0)
+ ; r9 = return address
+ ; r10 = per-proc ptr
+ ; r11 = MSR at entry
+ ; r30 = what SACalloc looks like when all saveareas are free
+ ; r31 = free pool block list
+ ; cr1 = beq set if we just trimmed the last, ie if we are done
+ ;
+ ; WARNING: as in the 32-bit path, this code is doing a divide by 640 (SAVsize).
+
+sttoss64:
+ beq++ cr1,stdone ; All done now...
+
+ cmpld cr1,r6,r7 ; Have we finished the loop?
+
+ lis r0,0x0044 ; Get top of table
+ rldicr r2,r6,0,51 ; r2 <- phys addr of savearea block (with control area)
+ ori r0,r0,0x2200 ; Finish shift table
+ rlwinm r4,r6,25,27,30 ; Get (addr >> 7) & 0x1E (same as twice high nybble)
+ lwz r5,SACalloc(r2) ; Get the allocation bits
+ addi r4,r4,1 ; Shift 1 extra
+ rlwinm r3,r6,25,31,31 ; Get (addr >> 7) & 1
+ rlwnm r0,r0,r4,29,31 ; Get partial index
+ lis r4,lo16(0x8000) ; Get the bit mask
+ add r0,r0,r3 ; Make the real index
+ srw r4,r4,r0 ; Get the allocation mask
+ or r5,r5,r4 ; Free this entry
+ cmplw r5,r4 ; Is this the only free entry?
+ ld r6,SAVprev(r6) ; Chain to the next trimmed savearea
+ cmplw cr7,r30,r5 ; Does this look empty?
+ stw r5,SACalloc(r2) ; Save back the allocation bits
+ beq-- stputpool64 ; First free entry, go put it into the pool...
+ bne++ cr7,sttoss64 ; Not an empty block
- lwz r4,SACvrswap(r4) ; Get the conversion to virtual
- mtmsr r10 ; Interrupts and DR back on
- isync
- xor r3,r3,r4 ; Convert to physical
- blr
+; We have an empty block. Remove it from the pool list.
+
+ lwz r29,SACflags(r2) ; Get the flags
+ cmpldi cr5,r31,0 ; Is this guy on the release list?
+ ld r28,SACnext(r2) ; Get the forward chain
+
+ rlwinm. r0,r29,0,sac_permb,sac_permb ; Is this a permanently allocated area? (also sets 0 needed below)
+ bne-- sttoss64 ; This is permanent entry, do not try to release...
+
+ ld r29,SACprev(r2) ; and the previous
+ beq-- cr5,stnot1st64 ; Not first
+ ld r0,SACvrswap(r31) ; Load the previous pool page vr conversion
+
+stnot1st64:
+ std r28,SACnext(r29) ; Previous guy points to my next
+ xor r0,r0,r31 ; Make the last guy virtual
+ std r29,SACprev(r28) ; Next guy points back to my previous
+ std r0,SAVprev(r2) ; Store the old top virtual as my back chain
+ mr r31,r2 ; My physical is now the head of the chain
+ b sttoss64 ; Get the next one...
+
+; A pool block that had no free entries now has one. Stick it on the pool list.
+
+stputpool64:
+ ld r28,SVpoolfwd(0) ; Get the first guy on the list
+ li r0,saveanchor ; Point to the saveanchor
+ std r2,SVpoolfwd(0) ; Put us on the top of the list
+ std r28,SACnext(r2) ; We point to the old top
+ std r2,SACprev(r28) ; Old top guy points back to us
+ std r0,SACprev(r2) ; Our back points to the anchor
+ b sttoss64 ; Go on to the next one...
+
+
+; We are all done. Relocate pool release head, restore all, and go. This code
+; is used both by the 32 and 64-bit paths.
+; r9 = return address
+; r10 = per-proc ptr
+; r11 = MSR at entry
+; r31 = free pool block list
+
+stdone: bl saveunlock ; Unlock the saveanchor and set adjust field
+
+ mr. r3,r31 ; Move release chain and see if there are any
+ li r5,0 ; Assume either V=R or no release chain
+ beq- stnorel ; Nothing to release...
+ lwz r5,SACvrswap+4(r31) ; Get the vr conversion (only need low half if 64-bit)
+
+stnorel:
+ bl saveRestore ; restore translation and exceptions, turn off SF
+ mtlr r9 ; Restore the return
+
+ lwz r28,FM_SIZE+0(r1) ; Restore R28
+ lwz r29,FM_SIZE+4(r1) ; Restore R29
+ lwz r30,FM_SIZE+8(r1) ; Restore R30
+ lwz r31,FM_SIZE+12(r1) ; Restore R31
+ addi r1,r1,(FM_ALIGN(16)+FM_SIZE) ; Pop the stack
+ xor r3,r3,r5 ; Convert release chain address to virtual
+ rlwinm r3,r3,0,0,31 ; if 64-bit, clear upper half of virtual address
+
+#if FPVECDBG
+ lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG)
+ li r2,0x2207 ; (TEST/DEBUG)
+ oris r0,r0,LOW_ADDR(CutTrace) ; (TEST/DEBUG)
+ sc ; (TEST/DEBUG)
+#endif
+ blr ; Return...
+
+
+/*
+ * ***************************
+ * * s a v e _ r e c o v e r *
+ * ***************************
+ *
+ * int save_recover(void);
+ *
+ * Returns nonzero if we can get enough saveareas to hit the target. We scan the free
+ * pool. If we empty a pool block, we remove it from the pool list.
+ */
+
+ .align 5
+ .globl EXT(save_recover)
+
+LEXT(save_recover)
+ mflr r9 ; save return address
+ bl saveSetup ; turn translation and interrupts off, SF on, load many regs
+ bl savelock ; lock the savearea anchor
+
+ lwz r8,SVadjust(0) ; How many do we need to clear get?
+ li r3,0 ; Get a 0
+ mr. r8,r8 ; Do we need any?
+ ble-- save_recover1 ; not any more
+ bf-- pf64Bitb,saveRecover32 ; handle 32-bit processor
+ b saveRecover64 ; handle 64-bit processor
+
+save_recover1: ; by the time we locked the anchor, no longer short
+ mtlr r9 ; Restore return
+ stw r3,SVlock(0) ; Quick unlock (no need for sync or to set adjust, nothing changed)
+#if FPVECDBG
+ lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG)
+ li r2,0x2208 ; (TEST/DEBUG)
+ oris r0,r0,LOW_ADDR(CutTrace) ; (TEST/DEBUG)
+ sc ; (TEST/DEBUG)
+#endif
+ b saveRestore ; turn translation etc back on, return to our caller
/*
- * This routine will return the virtual address of the first free savearea
- * block and disable for interruptions.
- * Note really well: this is only for debugging, don't expect it to always work!
+ * *****************************
+ * * s a v e R e c o v e r 3 2 *
+ * *****************************
*
- * We take a virtual address in R3 to save the original MSR, and
- * return the virtual address.
+ * Handle "save_recover" on 32-bit processors. At this point, translation and interrupts
+ * are off, the savearea anchor is locked, and:
+ * r8 = #pages to recover
+ * r9 = return address
+ * r10 = per-proc ptr
+ * r11 = MSR at entry
+ */
+
+saveRecover32:
+ li r6,saveanchor ; Start at pool anchor
+ crclr cr1_eq ; initialize the loop test
+ lwz r7,SVfreecnt(0) ; Get the current free count
+
+
+; Loop over next block in free pool. r6 is the ptr to the last block we looked at.
+
+srcnpool: lwz r6,SACnext+4(r6) ; Point to the next one
+ cmplwi r6,saveanchor ; Have we wrapped?
+ beq- srcdone ; Yes, did not have enough...
+
+ lwz r5,SACalloc(r6) ; Pick up the allocation for this pool block
+
+;
+; NOTE: The savearea size must be 640 (0x280). We are doing a multiply by shifts and add.
+; offset = (index << 9) + (index << 7)
+;
+#if SAVsize != 640
+#error Savearea size is not 640!!!!!!!!!!!!
+#endif
+
+; Loop over free savearea in current block.
+; r5 = bitmap of free saveareas in block at r6 (ie, SACalloc)
+; r6 = ptr to current free pool block
+; r7 = free count
+; r8 = #pages more we still need to recover
+; r9 = return address
+; r10 = per-proc ptr
+; r11 = MSR at entry
+; cr1 = beq if (r8==0)
+
+srcnext: beq- cr1,srcdone ; We have no more to get...
+
+ lis r3,0x8000 ; Get the top bit on
+ cntlzw r4,r5 ; Find a free slot
+ addi r7,r7,1 ; Bump up the free count
+ srw r3,r3,r4 ; Make a mask
+ slwi r0,r4,7 ; First multiply by 128
+ subi r8,r8,1 ; Decrement the need count
+ slwi r2,r4,9 ; Then multiply by 512
+ andc. r5,r5,r3 ; Clear out the "free" bit
+ add r2,r2,r0 ; Sum to multiply by 640
+
+ stw r5,SACalloc(r6) ; Set new allocation bits
+
+ add r2,r2,r6 ; Get the actual address of the savearea
+ lwz r3,SVfree+4(0) ; Get the head of the chain
+ cmplwi cr1,r8,0 ; Do we actually need any more?
+ stw r2,SVfree+4(0) ; Push ourselves in the front
+ stw r3,SAVprev+4(r2) ; Chain the rest of the list behind
+
+ bne+ srcnext ; The pool block is not empty yet, try for another...
+
+ lwz r2,SACnext+4(r6) ; Get the next pointer
+ lwz r3,SACprev+4(r6) ; Get the previous pointer
+ stw r3,SACprev+4(r2) ; The previous of my next points to my previous
+ stw r2,SACnext+4(r3) ; The next of my previous points to my next
+ bne+ cr1,srcnpool ; We still have more to do...
+
+
+; Join here from 64-bit path when we have recovered all the saveareas we need to.
+
+srcdone: stw r7,SVfreecnt(0) ; Set the new free count
+ bl saveunlock ; Unlock the save and set adjust field
+
+ mtlr r9 ; Restore the return
+#if FPVECDBG
+ lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG)
+ li r2,0x2209 ; (TEST/DEBUG)
+ oris r0,r0,LOW_ADDR(CutTrace) ; (TEST/DEBUG)
+ sc ; (TEST/DEBUG)
+#endif
+ b saveRestore ; turn xlate and EE back on, SF off, and return to our caller
+
+
+/*
+ * *****************************
+ * * s a v e R e c o v e r 6 4 *
+ * *****************************
*
+ * Handle "save_recover" on 64-bit processors. At this point, translation and interrupts
+ * are off, the savearea anchor is locked, and:
+ * r8 = #pages to recover
+ * r9 = return address
+ * r10 = per-proc ptr
+ * r11 = MSR at entry
*/
-ENTRY(save_deb,TAG_NO_FRAME_USED)
+saveRecover64:
+ li r6,saveanchor ; Start at pool anchor
+ crclr cr1_eq ; initialize the loop test
+ lwz r7,SVfreecnt(0) ; Get the current free count
- mfsprg r9,2 ; Get the feature flags
- mfmsr r12 /* Get the MSR */
- lis r10,HIGH_ADDR(EXT(saveanchor)) /* Get the high part of the anchor */
- mtcrf 0x04,r9 ; Set the features
- stw r12,0(r3) /* Save it */
- andi. r3,r12,0x7FCF /* Turn off all translation and 'rupts */
- ori r10,r10,LOW_ADDR(EXT(saveanchor)) /* Bottom half of the anchor */
- bt pfNoMSRirb,sdbNoMSR ; No MSR...
+; Loop over next block in free pool. r6 is the ptr to the last block we looked at.
- mtmsr r3 ; Translation and all off
- isync ; Toss prefetch
- b sdbNoMSRx
+srcnpool64:
+ ld r6,SACnext(r6) ; Point to the next one
+ cmpldi r6,saveanchor ; Have we wrapped?
+ beq-- srcdone ; Yes, did not have enough...
+
+ lwz r5,SACalloc(r6) ; Pick up the allocation for this pool block
-sdbNoMSR: li r0,loadMSR ; Get the MSR setter SC
- sc ; Set it
-sdbNoMSRx:
- lwz r3,SVfree(r10) /* Get the physical first in list */
- andi. r11,r12,0x7FFF /* Clear only interruption */
- lwz r5,SACvrswap(r3) /* Get the conversion to virtual */
- mtmsr r11 /* Restore DAT but not INT */
- xor r3,r3,r5 /* Make it virtual */
- isync
- blr
+; Loop over free savearea in current block.
+; r5 = bitmap of free saveareas in block at r6 (ie, SACalloc)
+; r6 = ptr to current free pool block
+; r7 = free count
+; r8 = #pages more we still need to recover
+; r9 = return address
+; r10 = per-proc ptr
+; r11 = MSR at entry
+; cr1 = beq if (r8==0)
+;
+; WARNING: as in the 32-bit path, we depend on (SAVsize==640)
+
+srcnext64:
+ beq-- cr1,srcdone ; We have no more to get...
+
+ lis r3,0x8000 ; Get the top bit on
+ cntlzw r4,r5 ; Find a free slot
+ addi r7,r7,1 ; Bump up the free count
+ srw r3,r3,r4 ; Make a mask
+ slwi r0,r4,7 ; First multiply by 128
+ subi r8,r8,1 ; Decrement the need count
+ slwi r2,r4,9 ; Then multiply by 512
+ andc. r5,r5,r3 ; Clear out the "free" bit
+ add r2,r2,r0 ; Sum to multiply by 640
+ stw r5,SACalloc(r6) ; Set new allocation bits
+ add r2,r2,r6 ; Get the actual address of the savearea
+ ld r3,SVfree(0) ; Get the head of the chain
+ cmplwi cr1,r8,0 ; Do we actually need any more?
+ std r2,SVfree(0) ; Push ourselves in the front
+ std r3,SAVprev(r2) ; Chain the rest of the list behind
+ bne++ srcnext64 ; The pool block is not empty yet, try for another...
+
+ ld r2,SACnext(r6) ; Get the next pointer
+ ld r3,SACprev(r6) ; Get the previous pointer
+ std r3,SACprev(r2) ; The previous of my next points to my previous
+ std r2,SACnext(r3) ; The next of my previous points to my next
+ bne++ cr1,srcnpool64 ; We still have more to do...
+
+ b srcdone
+
+/*
+ * *******************
+ * * s a v e l o c k *
+ * *******************
+ *
+ * Lock the savearea anchor, so we can manipulate the free list.
+ * msr = interrupts and translation off
+ * We destroy:
+ * r8, r3, r12
+ */
+ .align 5
+
+savelock: lwz r8,SVlock(0) ; See if lock is held
+ cmpwi r8,0
+ li r12,saveanchor ; Point to the saveanchor
+ bne-- savelock ; loop until lock released...
+
+savelock0: lwarx r8,0,r12 ; Grab the lock value
+ cmpwi r8,0 ; taken?
+ li r8,1 ; get nonzero to lock it with
+ bne-- savelock1 ; already locked, wait for it to clear...
+ stwcx. r8,0,r12 ; Try to seize that there durn lock
+ isync ; assume we got it
+ beqlr++ ; reservation not lost, so we have the lock
+ b savelock0 ; Try again...
+
+savelock1: li r8,lgKillResv ; Point to killing field
+ stwcx. r8,0,r8 ; Kill reservation
+ b savelock ; Start over....
+
+
+/*
+ * ***********************
+ * * s a v e u n l o c k *
+ * ***********************
+ *
+ *
+ * This is the common routine that sets the saveadjust field and unlocks the savearea
+ * anchor.
+ * msr = interrupts and translation off
+ * We destroy:
+ * r2, r5, r6, r8.
+ */
+ .align 5
+saveunlock:
+ lwz r6,SVfreecnt(0) ; and the number on the free list
+ lwz r5,SVinuse(0) ; Pick up the in use count
+ subic. r8,r6,FreeListMin ; do we have at least the minimum?
+ lwz r2,SVtarget(0) ; Get the target
+ neg r8,r8 ; assuming we are short, get r8 <- shortfall
+ blt-- saveunlock1 ; skip if fewer than minimum on free list
+
+ add r6,r6,r5 ; Get the total number of saveareas
+ addi r5,r2,-SaveLowHysteresis ; Find low end of acceptible range
+ sub r5,r6,r5 ; Make everything below hysteresis negative
+ sub r2,r2,r6 ; Get the distance from the target
+ addi r5,r5,-(SaveLowHysteresis + SaveHighHysteresis + 1) ; Subtract full hysteresis range
+ srawi r5,r5,31 ; Get 0xFFFFFFFF if outside range or 0 if inside
+ and r8,r2,r5 ; r8 <- 0 if in range or distance to target if not
+
+saveunlock1:
+ li r5,0 ; Set a clear value
+ stw r8,SVadjust(0) ; Set the adjustment value
+ eieio ; Make sure everything is done
+ stw r5,SVlock(0) ; Unlock the savearea chain
+ blr
+
+
+/*
+ * *******************
+ * * s a v e _ c p v *
+ * *******************
+ *
+ * struct savearea *save_cpv(addr64_t saveAreaPhysAddr);
+ *
+ * Converts a physical savearea address to virtual. Called with translation on
+ * and in 32-bit mode. Note that the argument is passed as a long long in (r3,r4).
+ */
+
+ .align 5
+ .globl EXT(save_cpv)
+
+LEXT(save_cpv)
+ mflr r9 ; save return address
+ mr r8,r3 ; save upper half of phys address here
+ bl saveSetup ; turn off translation and interrupts, turn SF on
+ rlwinm r5,r4,0,0,19 ; Round back to the start of the physical savearea block
+ bf-- pf64Bitb,save_cpv1 ; skip if 32-bit processor
+ rldimi r5,r8,32,0 ; r5 <- 64-bit phys address of block
+save_cpv1:
+ lwz r6,SACvrswap+4(r5) ; Get the conversion to virtual (only need low half if 64-bit)
+ mtlr r9 ; restore return address
+ xor r3,r4,r6 ; convert phys to virtual
+ rlwinm r3,r3,0,0,31 ; if 64-bit, zero upper half of virtual address
+ b saveRestore ; turn translation etc back on, SF off, and return r3
+
+
+/*
+ * *********************
+ * * s a v e S e t u p *
+ * *********************
+ *
+ * This routine is called at the start of all the save-area subroutines.
+ * It turns off translation, disabled interrupts, turns on 64-bit mode,
+ * and sets up cr6 with the feature flags (especially pf64Bit).
+ *
+ * Note that most save-area routines cannot take _any_ interrupt (such as a
+ * PTE miss) once the savearea anchor is locked, since that would result in
+ * instant deadlock as we need a save-area to process any exception.
+ * We set up:
+ * r10 = per-proc ptr
+ * r11 = old MSR
+ * cr5 = pfNoMSRir feature flag
+ * cr6 = pf64Bit feature flag
+ *
+ * We use r0, r3, r10, and r11.
+ */
+
+saveSetup:
+ mfmsr r11 ; get msr
+ mfsprg r3,2 ; get feature flags
+ li r0,0
+ mtcrf 0x2,r3 ; copy pf64Bit to cr6
+ ori r0,r0,lo16(MASK(MSR_IR)+MASK(MSR_DR)+MASK(MSR_EE))
+ mtcrf 0x4,r3 ; copy pfNoMSRir to cr5
+ andc r3,r11,r0 ; turn off IR, DR, and EE
+ li r0,1 ; get a 1 in case its a 64-bit machine
+ bf-- pf64Bitb,saveSetup1 ; skip if not a 64-bit machine
+ rldimi r3,r0,63,MSR_SF_BIT ; turn SF (bit 0) on
+ mtmsrd r3 ; turn translation and interrupts off, 64-bit mode on
+ isync ; wait for it to happen
+ mfsprg r10,0 ; get per-proc ptr
+ blr
+saveSetup1: ; here on 32-bit machines
+ bt- pfNoMSRirb,saveSetup2 ; skip if cannot turn off IR with a mtmsr
+ mtmsr r3 ; turn translation and interrupts off
+ isync ; wait for it to happen
+ mfsprg r10,0 ; get per-proc ptr
+ blr
+saveSetup2: ; here if pfNoMSRir set for this machine
+ li r0,loadMSR ; we will "mtmsr r3" via system call
+ sc
+ mfsprg r10,0 ; get per-proc ptr
+ blr
+
+
+/*
+ * *************************
+ * * s a v e R e s t o r e *
+ * *************************
+ *
+ * Undoes the effect of calling "saveSetup", ie it turns relocation and interrupts back on,
+ * and turns 64-bit mode back off.
+ * r11 = old MSR
+ * cr6 = pf64Bit feature flag
+ */
+
+saveRestore:
+ bt++ pf64Bitb,saveRestore64 ; handle a 64-bit processor
+saveRestore32:
+ mtmsr r11 ; restore MSR
+ isync ; wait for translation to start up
+ blr
+saveRestore64: ; 64-bit processor
+ mtmsrd r11 ; restore MSR
+ isync ; wait for changes to happen
+ blr
projects / apple / xnu.git / blobdiff