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Map DMAP as nx.

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Demotions preserve PG_NX, so it is enough to set nx bit for initial
lowest-level paging entries.

Suggested and reviewed by:	alc
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2017-04-13 15:49:55 +00:00
parent 72f0a13e60
commit 33c72b24de
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=316767
1 changed files with 2 additions and 2 deletions
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4
sys/amd64/amd64/pmap.c
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@ -933,14 +933,14 @@ create_pagetables(vm_paddr_t *firstaddr)
pd_p[j] = (vm_paddr_t)i << PDRSHIFT;
/* Preset PG_M and PG_A because demotion expects it. */
pd_p[j] |= X86_PG_RW | X86_PG_V | PG_PS | X86_PG_G |
X86_PG_M | X86_PG_A;
X86_PG_M | X86_PG_A | pg_nx;
}
pdp_p = (pdp_entry_t *)DMPDPphys;
for (i = 0; i < ndm1g; i++) {
pdp_p[i] = (vm_paddr_t)i << PDPSHIFT;
/* Preset PG_M and PG_A because demotion expects it. */
pdp_p[i] |= X86_PG_RW | X86_PG_V | PG_PS | X86_PG_G |
X86_PG_M | X86_PG_A;
X86_PG_M | X86_PG_A | pg_nx;
}
for (j = 0; i < ndmpdp; i++, j++) {
pdp_p[i] = DMPDphys + ptoa(j);