diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2012-09-28 16:29:55 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2012-09-28 16:29:55 +0200 |
| commit | cb418b34caddc970c1513e515aaa535246a4bba3 (patch) | |
| tree | b89720b74d6a85a9407f03bb064248c7235b9dea /arch/mips/mm/tlbex.c | |
| parent | 77a0d763c461da81c2a3fc9a7e58162a40854a1a (diff) | |
| parent | ff401e52100dcdc85e572d1ad376d3307b3fe28e (diff) | |
Merge branch 'ralf-3.7' of git://git.linux-mips.org/pub/scm/sjhill/linux-sjhill into mips-for-linux-next
Diffstat (limited to 'arch/mips/mm/tlbex.c')
| -rw-r--r-- | arch/mips/mm/tlbex.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 1832f17e6be4..e09d49256908 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -449,8 +449,20 @@ static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l, } if (cpu_has_mips_r2) { - if (cpu_has_mips_r2_exec_hazard) + /* + * The architecture spec says an ehb is required here, + * but a number of cores do not have the hazard and + * using an ehb causes an expensive pipeline stall. + */ + switch (current_cpu_type()) { + case CPU_M14KC: + case CPU_74K: + break; + + default: uasm_i_ehb(p); + break; + } tlbw(p); return; } @@ -921,6 +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 */ @@ -956,6 +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 |