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* Document the existing requirement that machine-independent code 

not pmap_kenter_pa() a mapping at a virtual address for which a
  valid mapping already exists.
* Document the new requirement that machine-independent code not
  not pmap_kenter_pa() a mapping with VM_PROT_EXEC.
This commit is contained in:
thorpej 2002-08-14 15:25:50 +00:00
parent 95cb683cfb
commit b890d48c5a
1 changed files with 14 additions and 3 deletions
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17
share/man/man9/pmap.9
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@ -1,6 +1,6 @@
.\" $NetBSD: pmap.9,v 1.14 2002/04/01 17:30:02 chs Exp $ .\" $NetBSD: pmap.9,v 1.15 2002/08/14 15:25:50 thorpej Exp $
.\" .\"
.\" Copyright (c) 2000, 2001 The NetBSD Foundation, Inc. .\" Copyright (c) 2000, 2001, 2002 The NetBSD Foundation, Inc.
.\" All rights reserved. .\" All rights reserved.
.\" .\"
.\" This code is derived from software contributed to The NetBSD Foundation .\" This code is derived from software contributed to The NetBSD Foundation
@ -558,7 +558,18 @@ and are unaffected by routines that alter the protection of pages
(such as (such as
.Fn pmap_page_protect ) Ns . .Fn pmap_page_protect ) Ns .
Such mappings are also not included in the gathering of modified/referenced Such mappings are also not included in the gathering of modified/referenced
information about a page. Mappings created with information about a page. Mappings entered with
.Fn pmap_kenter_pa
by machine-independent code
.Em must not
have execute permission, as the
data structures required to track execute permission of a page may not
be available to
.Fn pmap_kenter_pa .
Machine-independent code is not allowed to enter a mapping with
.Fn pmap_kenter_pa
at a virtual address for which a valid mapping already exists.
Mappings created with
.Fn pmap_kenter_pa .Fn pmap_kenter_pa
may be removed only with a call to may be removed only with a call to
.Fn pmap_kremove . .Fn pmap_kremove .