diff options
| author | Miod Vallat <miod@cvs.openbsd.org> | 2014-03-10 21:17:59 +0000 |
|---|---|---|
| committer | Miod Vallat <miod@cvs.openbsd.org> | 2014-03-10 21:17:59 +0000 |
| commit | 683800fdaa7922d20c840dade377b3cc138078c8 (patch) | |
| tree | b3d3ac4baab2be4ac86e78c8a609ce2979f87645 /sys/arch | |
| parent | 818f5de7a8d1b822002472c3603619b1290a874f (diff) | |
Support PMAP_NOCACHE in pmap_enter() flags. If set when mapping a managed
page, the pte is created uncached.
Make sure pmap_enter_pv() honours the cache bits of the pte, instead of
assuming it will only get called for cached pages. Have it set PV_UNCACHED
in the pv flags for the page, if this is the first use of this page and the
mapping is not cached. Only check for a virtual aliasing cache condition if
the new mapping is cached.
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/mips64/include/pmap.h | 4 | ||||
| -rw-r--r-- | sys/arch/mips64/mips64/pmap.c | 14 |
2 files changed, 14 insertions, 4 deletions
diff --git a/sys/arch/mips64/include/pmap.h b/sys/arch/mips64/include/pmap.h index 1e73c953a39..3ab8e93f22c 100644 --- a/sys/arch/mips64/include/pmap.h +++ b/sys/arch/mips64/include/pmap.h @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap.h,v 1.31 2014/02/08 09:34:04 miod Exp $ */ +/* $OpenBSD: pmap.h,v 1.32 2014/03/10 21:17:58 miod Exp $ */ /* * Copyright (c) 1987 Carnegie-Mellon University @@ -133,6 +133,8 @@ typedef struct pmap { #define PV_ATTR_REF PG_PMAP3 #define PV_PRESERVE (PV_ATTR_MOD | PV_ATTR_REF) +#define PMAP_NOCACHE PMAP_MD0 + extern struct pmap *const kernel_pmap_ptr; #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) diff --git a/sys/arch/mips64/mips64/pmap.c b/sys/arch/mips64/mips64/pmap.c index 6b30afed2d0..21ef6dd20ba 100644 --- a/sys/arch/mips64/mips64/pmap.c +++ b/sys/arch/mips64/mips64/pmap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap.c,v 1.68 2014/02/08 09:34:04 miod Exp $ */ +/* $OpenBSD: pmap.c,v 1.69 2014/03/10 21:17:58 miod Exp $ */ /* * Copyright (c) 2001-2004 Opsycon AB (www.opsycon.se / www.opsycon.com) @@ -916,6 +916,10 @@ pmap_enter(pmap_t pmap, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags) } } } + if (flags & PMAP_NOCACHE) { + npte &= ~PG_CACHED; + npte |= PG_UNCACHED; + } /* Set page referenced/modified status based on flags */ if (flags & VM_PROT_WRITE) @@ -1541,7 +1545,10 @@ pmap_enter_pv(pmap_t pmap, vaddr_t va, vm_page_t pg, pt_entry_t *npte) stat_count(enter_stats.firstpv); pv->pv_va = va; - atomic_setbits_int(&pg->pg_flags, PV_CACHED); + if (*npte & PG_CACHED) + atomic_setbits_int(&pg->pg_flags, PV_CACHED); + if (*npte & PG_UNCACHED) + atomic_setbits_int(&pg->pg_flags, PV_UNCACHED); pv->pv_pmap = pmap; pv->pv_next = NULL; } else { @@ -1580,7 +1587,8 @@ pmap_enter_pv(pmap_t pmap, vaddr_t va, vm_page_t pg, pt_entry_t *npte) return ENOMEM; } - if ((pg->pg_flags & PV_CACHED) != 0 && cache_valias_mask != 0) { + if ((*npte & PG_CACHED) != 0 && + (pg->pg_flags & PV_CACHED) != 0 && cache_valias_mask != 0) { /* * We have a VAC possibility. Check if virtual * address of current mappings are compatible |