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| author | Steven J. Hill <sjhill@mips.com> | 2012-08-28 23:20:39 -0500 |
|---|---|---|
| committer | Steven J. Hill <sjhill@mips.com> | 2012-09-13 15:43:54 -0500 |
| commit | ff401e52100dcdc85e572d1ad376d3307b3fe28e (patch) | |
| tree | 2ba28fa473249e6b9daebf76a3d1835650e3f5de /arch/mips/mm | |
| parent | e6de1a09a2f6a6825341e8463866553b77848ed6 (diff) | |
| download | lwn-ff401e52100dcdc85e572d1ad376d3307b3fe28e.tar.gz lwn-ff401e52100dcdc85e572d1ad376d3307b3fe28e.zip | |
MIPS: Optimise TLB handlers for MIPS32/64 R2 cores.
The EXT and INS instructions can be used to decrease code size and
thus speed up TLB handlers on MIPS32R2 and MIPS64R2 cores.
Signed-off-by: Steven J. Hill <sjhill@mips.com>
Diffstat (limited to 'arch/mips/mm')
| -rw-r--r-- | arch/mips/mm/tlbex.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 22ba108d708d..70a70085ffd1 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -933,6 +933,13 @@ build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr) #endif uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */ uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr); + + if (cpu_has_mips_r2) { + uasm_i_ext(p, tmp, tmp, PGDIR_SHIFT, (32 - PGDIR_SHIFT)); + uasm_i_ins(p, ptr, tmp, PGD_T_LOG2, (32 - PGDIR_SHIFT)); + return; + } + uasm_i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */ uasm_i_sll(p, tmp, tmp, PGD_T_LOG2); uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */ @@ -968,6 +975,15 @@ static void __cpuinit build_adjust_context(u32 **p, unsigned int ctx) static void __cpuinit build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr) { + if (cpu_has_mips_r2) { + /* PTE ptr offset is obtained from BadVAddr */ + UASM_i_MFC0(p, tmp, C0_BADVADDR); + UASM_i_LW(p, ptr, 0, ptr); + uasm_i_ext(p, tmp, tmp, PAGE_SHIFT+1, PGDIR_SHIFT-PAGE_SHIFT-1); + uasm_i_ins(p, ptr, tmp, PTE_T_LOG2+1, PGDIR_SHIFT-PAGE_SHIFT-1); + return; + } + /* * Bug workaround for the Nevada. It seems as if under certain * circumstances the move from cp0_context might produce a |