diff options
| author | Mark Kettenis <kettenis@cvs.openbsd.org> | 2006-05-31 06:51:26 +0000 |
|---|---|---|
| committer | Mark Kettenis <kettenis@cvs.openbsd.org> | 2006-05-31 06:51:26 +0000 |
| commit | 272621574dff0db8a0801f4e4a0bc4d6fed4b0c0 (patch) | |
| tree | c34b9a0a0b9827b593eee61b8610272a93838cf2 /sys/arch/sparc64 | |
| parent | 850db274bbcb76df23ac406771570411f17474dc (diff) | |
The bright people at Sun removed the secondary context from the IMMU in the
UltraSPARC III. Hack around it by temporarily switching to nucleus context
when flushing TLBs. Put this hack under HORRID_III_HACK for now.
Compiling with HORRID_III_HACK results in a kernel that runs on the Blade
2000 "at the speed of a 140MHz UltraSPARC I".
ok jason@
Diffstat (limited to 'sys/arch/sparc64')
| -rw-r--r-- | sys/arch/sparc64/sparc64/locore.s | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/sys/arch/sparc64/sparc64/locore.s b/sys/arch/sparc64/sparc64/locore.s index fb8af0d2f98..e8840660791 100644 --- a/sys/arch/sparc64/sparc64/locore.s +++ b/sys/arch/sparc64/sparc64/locore.s @@ -1,4 +1,4 @@ -/* $OpenBSD: locore.s,v 1.56 2006/05/31 02:43:05 kettenis Exp $ */ +/* $OpenBSD: locore.s,v 1.57 2006/05/31 06:51:25 kettenis Exp $ */ /* $NetBSD: locore.s,v 1.137 2001/08/13 06:10:10 jdolecek Exp $ */ /* @@ -4680,6 +4680,25 @@ _C_LABEL(tlb_flush_pte): .text 2: #endif /* DEBUG */ +#ifdef HORRID_III_HACK + rdpr %pstate, %o5 + andn %o5, PSTATE_IE, %o4 + wrpr %o4, %pstate ! disable interrupts + + rdpr %tl, %o3 + brnz %o3, 1f + add %o3, 1, %g2 + wrpr %g0, %g2, %tl ! Switch to traplevel > 0 +1: + mov CTX_PRIMARY, %o2 + andn %o0, 0xfff, %g2 ! drop unused va bits + ldxa [%o2] ASI_DMMU, %g1 ! Save primary context + sethi %hi(KERNBASE), %o4 + membar #LoadStore + stxa %o1, [%o2] ASI_DMMU ! Insert context to demap + membar #Sync + or %g2, DEMAP_PAGE_PRIMARY, %g2 ! Demap page from primary context only +#else mov CTX_SECONDARY, %o2 andn %o0, 0xfff, %g2 ! drop unused va bits ldxa [%o2] ASI_DMMU, %g1 ! Save secondary context @@ -4688,6 +4707,7 @@ _C_LABEL(tlb_flush_pte): stxa %o1, [%o2] ASI_DMMU ! Insert context to demap membar #Sync or %g2, DEMAP_PAGE_SECONDARY, %g2 ! Demap page from secondary context only +#endif stxa %g2, [%g2] ASI_DMMU_DEMAP ! Do the demap membar #Sync stxa %g2, [%g2] ASI_IMMU_DEMAP ! to both TLBs @@ -4699,9 +4719,13 @@ _C_LABEL(tlb_flush_pte): stxa %g2, [%g2] ASI_IMMU_DEMAP ! Do the demap membar #Sync ! No real reason for this XXXX flush %o4 - stxa %g1, [%o2] ASI_DMMU ! Restore secondary asi + stxa %g1, [%o2] ASI_DMMU ! Restore asi membar #Sync ! No real reason for this XXXX flush %o4 +#ifdef HORRID_III_HACK + wrpr %g0, %o3, %tl ! Restore traplevel + wrpr %o5, %pstate ! Restore interrupts +#endif retl nop |