diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-30 17:23:31 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-30 17:23:31 -0800 |
| commit | 6de71484cf9561edb45224f659a9db38b6056d5e (patch) | |
| tree | 588fe6f7c98147b805085503c863d371e2fa497e /arch/sparc/kernel/dtlb_prot.S | |
| parent | 1dff81f20cd55ffa5a8ee984da70ce0b99d29606 (diff) | |
| parent | e3c6d4ee545e427b55882d97d3b663c6411645fe (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6: (98 commits)
sparc: move select of ARCH_SUPPORTS_MSI
sparc: drop SUN_IO
sparc: unify sections.h
sparc: use .data.init_task section for init_thread_union
sparc: fix array overrun check in of_device_64.c
sparc: unify module.c
sparc64: prepare module_64.c for unification
sparc64: use bit neutral Elf symbols
sparc: unify module.h
sparc: introduce CONFIG_BITS
sparc: fix hardirq.h removal fallout
sparc64: do not export pus_fs_struct
sparc: use sparc64 version of scatterlist.h
sparc: Commonize memcmp assembler.
sparc: Unify strlen assembler.
sparc: Add asm/asm.h
sparc: Kill memcmp_32.S code which has been ifdef'd out for centuries.
sparc: replace for_each_cpu_mask_nr with for_each_cpu
sparc: fix sparse warnings in irq_32.c
sparc: add include guards to kernel.h
...
Diffstat (limited to 'arch/sparc/kernel/dtlb_prot.S')
| -rw-r--r-- | arch/sparc/kernel/dtlb_prot.S | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/sparc/kernel/dtlb_prot.S b/arch/sparc/kernel/dtlb_prot.S new file mode 100644 index 00000000000..b2c2c5be281 --- /dev/null +++ b/arch/sparc/kernel/dtlb_prot.S @@ -0,0 +1,54 @@ +/* + * dtlb_prot.S: DTLB protection trap strategy. + * This is included directly into the trap table. + * + * Copyright (C) 1996,1998 David S. Miller (davem@redhat.com) + * Copyright (C) 1997,1998 Jakub Jelinek (jj@ultra.linux.cz) + */ + +/* Ways we can get here: + * + * [TL == 0] 1) User stores to readonly pages. + * [TL == 0] 2) Nucleus stores to user readonly pages. + * [TL > 0] 3) Nucleus stores to user readonly stack frame. + */ + +/* PROT ** ICACHE line 1: User DTLB protection trap */ + mov TLB_SFSR, %g1 + stxa %g0, [%g1] ASI_DMMU ! Clear FaultValid bit + membar #Sync ! Synchronize stores + rdpr %pstate, %g5 ! Move into alt-globals + wrpr %g5, PSTATE_AG|PSTATE_MG, %pstate + rdpr %tl, %g1 ! Need a winfixup? + cmp %g1, 1 ! Trap level >1? + mov TLB_TAG_ACCESS, %g4 ! For reload of vaddr + +/* PROT ** ICACHE line 2: More real fault processing */ + bgu,pn %xcc, winfix_trampoline ! Yes, perform winfixup + ldxa [%g4] ASI_DMMU, %g5 ! Put tagaccess in %g5 + ba,pt %xcc, sparc64_realfault_common ! Nope, normal fault + mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4 + nop + nop + nop + nop + +/* PROT ** ICACHE line 3: Unused... */ + nop + nop + nop + nop + nop + nop + nop + nop + +/* PROT ** ICACHE line 4: Unused... */ + nop + nop + nop + nop + nop + nop + nop + nop |