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i386: reduce differences in source between PAE and non-PAE pmaps ...

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by defining pg_nx as zero for non-PAE and correspondingly simplifying
some expressions.

Suggested and reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D21757
This commit is contained in:
Konstantin Belousov 2019-09-22 19:59:10 +00:00
parent b223a69238
commit 66eb1d6347
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=352609
1 changed files with 7 additions and 22 deletions
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29
sys/i386/i386/pmap.c
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@ -227,6 +227,8 @@ static int nkpt = NKPT;
#ifdef PMAP_PAE_COMP
pt_entry_t pg_nx;
static uma_zone_t pdptzone;
#else
#define pg_nx 0
#endif
_Static_assert(VM_MAXUSER_ADDRESS == VADDR(TRPTDI, 0), "VM_MAXUSER_ADDRESS");
@ -1871,11 +1873,7 @@ __CONCAT(PMTYPE, qenter)(vm_offset_t sva, vm_page_t *ma, int count)
m->md.pat_mode, 0);
if ((*pte & (PG_FRAME | PG_PTE_CACHE)) != pa) {
oldpte |= *pte;
#ifdef PMAP_PAE_COMP
pte_store(pte, pa | pg_nx | PG_RW | PG_V);
#else
pte_store(pte, pa | PG_RW | PG_V);
#endif
}
pte++;
}
@ -6168,11 +6166,7 @@ sysctl_kmaps_dump(struct sbuf *sb, struct pmap_kernel_map_range *range,
sbuf_printf(sb, "0x%08x-0x%08x r%c%c%c%c %s %d %d %d\n",
range->sva, eva,
(range->attrs & PG_RW) != 0 ? 'w' : '-',
#ifdef PMAP_PAE_COMP
(range->attrs & pg_nx) != 0 ? '-' : 'x',
#else
'-',
#endif
(range->attrs & PG_U) != 0 ? 'u' : 's',
(range->attrs & PG_G) != 0 ? 'g' : '-',
mode, range->pdpes, range->pdes, range->ptes);
@ -6191,10 +6185,7 @@ sysctl_kmaps_match(struct pmap_kernel_map_range *range, pt_entry_t attrs)
{
pt_entry_t diff, mask;
mask = PG_G | PG_RW | PG_U | PG_PDE_CACHE;
#ifdef PMAP_PAE_COMP
mask |= pg_nx;
#endif
mask = pg_nx | PG_G | PG_RW | PG_U | PG_PDE_CACHE;
diff = (range->attrs ^ attrs) & mask;
if (diff == 0)
return (true);
@ -6224,21 +6215,15 @@ static void
sysctl_kmaps_check(struct sbuf *sb, struct pmap_kernel_map_range *range,
vm_offset_t va, pd_entry_t pde, pt_entry_t pte)
{
pt_entry_t attrs, mask;
pt_entry_t attrs;
attrs = pde & (PG_RW | PG_U);
#ifdef PMAP_PAE_COMP
attrs |= pde & pg_nx;
#endif
attrs = pde & (PG_RW | PG_U | pg_nx);
if ((pde & PG_PS) != 0) {
attrs |= pde & (PG_G | PG_PDE_CACHE);
} else if (pte != 0) {
mask = pte & (PG_RW | PG_U);
#ifdef PMAP_PAE_COMP
mask |= pg_nx;
#endif
attrs &= mask;
attrs |= pte & pg_nx;
attrs &= pg_nx | (pte & (PG_RW | PG_U));
attrs |= pte & (PG_G | PG_PTE_CACHE);
/* Canonicalize by always using the PDE PAT bit. */