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| author | Ingo Molnar <mingo@elte.hu> | 2009-09-04 07:28:52 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-04 07:29:05 (GMT) |
| commit | 29e2035bddecce3eb584a8304528b50da8370a24 (patch) | |
| tree | 13155df7d90a8e287b83a1cd6c0d02c3018212ab /arch/sparc/kernel/ktlb.S | |
| parent | 868489660dabc0c28087cca3dbc1adbbc398c6fe (diff) | |
| parent | 37d0892c5a94e208cf863e3b7bac014edee4346d (diff) | |
| download | linux-29e2035bddecce3eb584a8304528b50da8370a24.tar.xz | |
Merge branch 'linus' into core/rcu
Merge reason: Avoid fuzz in init/main.c and update from rc6 to rc8.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/sparc/kernel/ktlb.S')
| -rw-r--r-- | arch/sparc/kernel/ktlb.S | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/arch/sparc/kernel/ktlb.S b/arch/sparc/kernel/ktlb.S index cef8def..3ea6e8c 100644 --- a/arch/sparc/kernel/ktlb.S +++ b/arch/sparc/kernel/ktlb.S @@ -151,12 +151,46 @@ kvmap_dtlb_4v: * Must preserve %g1 and %g6 (TAG). */ kvmap_dtlb_tsb4m_miss: - sethi %hi(kpte_linear_bitmap), %g2 - or %g2, %lo(kpte_linear_bitmap), %g2 + /* Clear the PAGE_OFFSET top virtual bits, shift + * down to get PFN, and make sure PFN is in range. + */ + sllx %g4, 21, %g5 - /* Clear the PAGE_OFFSET top virtual bits, then shift - * down to get a 256MB physical address index. + /* Check to see if we know about valid memory at the 4MB + * chunk this physical address will reside within. */ + srlx %g5, 21 + 41, %g2 + brnz,pn %g2, kvmap_dtlb_longpath + nop + + /* This unconditional branch and delay-slot nop gets patched + * by the sethi sequence once the bitmap is properly setup. + */ + .globl valid_addr_bitmap_insn +valid_addr_bitmap_insn: + ba,pt %xcc, 2f + nop + .subsection 2 + .globl valid_addr_bitmap_patch +valid_addr_bitmap_patch: + sethi %hi(sparc64_valid_addr_bitmap), %g7 + or %g7, %lo(sparc64_valid_addr_bitmap), %g7 + .previous + + srlx %g5, 21 + 22, %g2 + srlx %g2, 6, %g5 + and %g2, 63, %g2 + sllx %g5, 3, %g5 + ldx [%g7 + %g5], %g5 + mov 1, %g7 + sllx %g7, %g2, %g7 + andcc %g5, %g7, %g0 + be,pn %xcc, kvmap_dtlb_longpath + +2: sethi %hi(kpte_linear_bitmap), %g2 + or %g2, %lo(kpte_linear_bitmap), %g2 + + /* Get the 256MB physical address index. */ sllx %g4, 21, %g5 mov 1, %g7 srlx %g5, 21 + 28, %g5 |