diff options
Diffstat (limited to 'arch/sparc64/kernel/dtlb_prot.S')
| -rw-r--r-- | arch/sparc64/kernel/dtlb_prot.S | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/dtlb_prot.S b/arch/sparc64/kernel/dtlb_prot.S new file mode 100644 index 000000000000..d848bb7374bb --- /dev/null +++ b/arch/sparc64/kernel/dtlb_prot.S | |||
| @@ -0,0 +1,54 @@ | |||
| 1 | /* $Id: dtlb_prot.S,v 1.22 2001/04/11 23:40:32 davem Exp $ | ||
| 2 | * dtlb_prot.S: DTLB protection trap strategy. | ||
| 3 | * This is included directly into the trap table. | ||
| 4 | * | ||
| 5 | * Copyright (C) 1996,1998 David S. Miller (davem@redhat.com) | ||
| 6 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@ultra.linux.cz) | ||
| 7 | */ | ||
| 8 | |||
| 9 | /* Ways we can get here: | ||
| 10 | * | ||
| 11 | * [TL == 0] 1) User stores to readonly pages. | ||
| 12 | * [TL == 0] 2) Nucleus stores to user readonly pages. | ||
| 13 | * [TL > 0] 3) Nucleus stores to user readonly stack frame. | ||
| 14 | */ | ||
| 15 | |||
| 16 | /* PROT ** ICACHE line 1: User DTLB protection trap */ | ||
| 17 | stxa %g0, [%g1] ASI_DMMU ! Clear SFSR FaultValid bit | ||
| 18 | membar #Sync ! Synchronize ASI stores | ||
| 19 | rdpr %pstate, %g5 ! Move into alternate globals | ||
| 20 | wrpr %g5, PSTATE_AG|PSTATE_MG, %pstate | ||
| 21 | rdpr %tl, %g1 ! Need to do a winfixup? | ||
| 22 | cmp %g1, 1 ! Trap level >1? | ||
| 23 | mov TLB_TAG_ACCESS, %g4 ! Prepare reload of vaddr | ||
| 24 | nop | ||
| 25 | |||
| 26 | /* PROT ** ICACHE line 2: More real fault processing */ | ||
| 27 | bgu,pn %xcc, winfix_trampoline ! Yes, perform winfixup | ||
| 28 | ldxa [%g4] ASI_DMMU, %g5 ! Put tagaccess in %g5 | ||
| 29 | ba,pt %xcc, sparc64_realfault_common ! Nope, normal fault | ||
| 30 | mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4 | ||
| 31 | nop | ||
| 32 | nop | ||
| 33 | nop | ||
| 34 | nop | ||
| 35 | |||
| 36 | /* PROT ** ICACHE line 3: Unused... */ | ||
| 37 | nop | ||
| 38 | nop | ||
| 39 | nop | ||
| 40 | nop | ||
| 41 | nop | ||
| 42 | nop | ||
| 43 | nop | ||
| 44 | nop | ||
| 45 | |||
| 46 | /* PROT ** ICACHE line 4: Unused... */ | ||
| 47 | nop | ||
| 48 | nop | ||
| 49 | nop | ||
| 50 | nop | ||
| 51 | nop | ||
| 52 | nop | ||
| 53 | nop | ||
| 54 | nop | ||