Added missing EHB (Execution Hazard Barrier) in mtc0 -> mfc0 sequence. Mips documentation Volume III (rev 6.03) table 8.1.
Signed-off-by: Dmitry Korotin dkorotin@wavecomp.com --- arch/mips/mm/tlbex.c | 32 ++++++++++++++++++++++---------- 1 files changed, 22 insertions(+), 10 deletions(-)
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 65b6e85..bf7f131 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -391,6 +391,7 @@ static struct work_registers build_get_work_registers(u32 **p) static void build_restore_work_registers(u32 **p) { if (scratch_reg >= 0) { + uasm_i_ehb(p); UASM_i_MFC0(p, 1, c0_kscratch(), scratch_reg); return; } @@ -668,10 +669,12 @@ static void build_restore_pagemask(u32 **p, struct uasm_reloc **r, uasm_i_mtc0(p, 0, C0_PAGEMASK); uasm_il_b(p, r, lid); } - if (scratch_reg >= 0) + if (scratch_reg >= 0) { + uasm_i_ehb(p); UASM_i_MFC0(p, 1, c0_kscratch(), scratch_reg); - else + } else { UASM_i_LW(p, 1, scratchpad_offset(0), 0); + } } else { /* Reset default page size */ if (PM_DEFAULT_MASK >> 16) { @@ -938,10 +941,12 @@ void build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, uasm_i_jr(p, ptr);
if (mode == refill_scratch) { - if (scratch_reg >= 0) + if (scratch_reg >= 0) { + uasm_i_ehb(p); UASM_i_MFC0(p, 1, c0_kscratch(), scratch_reg); - else + } else { UASM_i_LW(p, 1, scratchpad_offset(0), 0); + } } else { uasm_i_nop(p); } @@ -1258,6 +1263,7 @@ struct mips_huge_tlb_info { UASM_i_MTC0(p, odd, C0_ENTRYLO1); /* load it */
if (c0_scratch_reg >= 0) { + uasm_i_ehb(p); UASM_i_MFC0(p, scratch, c0_kscratch(), c0_scratch_reg); build_tlb_write_entry(p, l, r, tlb_random); uasm_l_leave(l, *p); @@ -1603,15 +1609,19 @@ static void build_setup_pgd(void) uasm_i_dinsm(&p, a0, 0, 29, 64 - 29); uasm_l_tlbl_goaround1(&l, p); UASM_i_SLL(&p, a0, a0, 11); - uasm_i_jr(&p, 31); UASM_i_MTC0(&p, a0, C0_CONTEXT); + uasm_i_ehb(&p); + uasm_i_jr(&p, 31); + uasm_i_nop(&p); } else { /* PGD in c0_KScratch */ - uasm_i_jr(&p, 31); if (cpu_has_ldpte) UASM_i_MTC0(&p, a0, C0_PWBASE); else UASM_i_MTC0(&p, a0, c0_kscratch(), pgd_reg); + uasm_i_ehb(&p); + uasm_i_jr(&p, 31); + uasm_i_nop(&p); } #else #ifdef CONFIG_SMP @@ -1625,13 +1635,15 @@ static void build_setup_pgd(void) UASM_i_LA_mostly(&p, a2, pgdc); UASM_i_SW(&p, a0, uasm_rel_lo(pgdc), a2); #endif /* SMP */ - uasm_i_jr(&p, 31);
/* if pgd_reg is allocated, save PGD also to scratch register */ - if (pgd_reg != -1) + if (pgd_reg != -1) { UASM_i_MTC0(&p, a0, c0_kscratch(), pgd_reg); - else - uasm_i_nop(&p); + uasm_i_ehb(&p); + } + + uasm_i_jr(&p, 31); + uasm_i_nop(&p); #endif if (p >= (u32 *)tlbmiss_handler_setup_pgd_end) panic("tlbmiss_handler_setup_pgd space exceeded");