diff options
| author |   kurt <kurt@openbsd.org> | 2008-12-18 14:18:29 +0000 |
|---|---|---|
| committer | kurt <kurt@openbsd.org> | 2008-12-18 14:18:29 +0000 |
| commit | b6088e177ff3b8fac27eac76abf2731d94bc8a6d (patch) | |
| tree | 6a5679bc256a089ab59223f2add4f2c16da85d88 | |
| parent | Don't set the global bit PG_G for kernel pmap low memory mappings. Use a (diff) | |
| download | wireguard-openbsd-b6088e177ff3b8fac27eac76abf2731d94bc8a6d.tar.xz wireguard-openbsd-b6088e177ff3b8fac27eac76abf2731d94bc8a6d.zip | |
Don't set the global bit PG_G for kernel pmap low memory mappings.
ok deraadt@
| -rw-r--r-- | sys/arch/amd64/amd64/pmap.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/sys/arch/amd64/amd64/pmap.c b/sys/arch/amd64/amd64/pmap.c index 19249b74f24..34e25c702d5 100644 --- a/sys/arch/amd64/amd64/pmap.c +++ b/sys/arch/amd64/amd64/pmap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap.c,v 1.34 2008/12/18 13:43:24 kurt Exp $ */ +/* $OpenBSD: pmap.c,v 1.35 2008/12/18 14:18:29 kurt Exp $ */ /* $NetBSD: pmap.c,v 1.3 2003/05/08 18:13:13 thorpej Exp $ */ /* @@ -447,8 +447,12 @@ pmap_kenter_pa(vaddr_t va, paddr_t pa, vm_prot_t prot) pte = kvtopte(va); - npte = pa | ((prot & VM_PROT_WRITE) ? PG_RW : PG_RO) | - PG_V | pmap_pg_g; + npte = pa | ((prot & VM_PROT_WRITE) ? PG_RW : PG_RO) | PG_V; + + /* special 1:1 mappings in the first 2MB must not be global */ + if (va >= (vaddr_t)NBPD_L2) + npte |= pmap_pg_g; + if ((cpu_feature & CPUID_NXE) && !(prot & VM_PROT_EXECUTE)) npte |= PG_NX; opte = pmap_pte_set(pte, npte); |