Module Name: src
Committed By: jym
Date: Sat Jul 24 23:09:32 UTC 2010
Modified Files:
src/share/man/man4: options.4
Log Message:
Document PAE.
To generate a diff of this commit:
cvs rdiff -u -r1.393 -r1.394 src/share/man/man4/options.4
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/share/man/man4/options.4
diff -u src/share/man/man4/options.4:1.393 src/share/man/man4/options.4:1.394
--- src/share/man/man4/options.4:1.393 Wed Jul 21 11:08:10 2010
+++ src/share/man/man4/options.4 Sat Jul 24 23:09:32 2010
@@ -1,4 +1,4 @@
-.\" $NetBSD: options.4,v 1.393 2010/07/21 11:08:10 wiz Exp $
+.\" $NetBSD: options.4,v 1.394 2010/07/24 23:09:32 jym Exp $
.\"
.\" Copyright (c) 1996
.\" Perry E. Metzger. All rights reserved.
@@ -2491,6 +2491,19 @@
.It Cd options USER_LDT
Include i386-specific system calls for modifying the local descriptor table,
used by Windows emulators.
+.It Cd options PAE
+Enable
+.Tn PAE (Physical Address Extension)
+mode.
+.Tn PAE
+permits up to 36 bits physical addressing (64GB of physical memory), and
+turns physical addresses to 64 bits entities in the memory management
+subsystem. Userland virtual address space remains at 32 bits (4GB).
+.Tn PAE
+mode is required to enable the
+.Tn NX/XD (No-eXecute/eXecute Disable)
+bit for pages, which allows marking certain ones as not being executable.
+Any attempt to execute code from such a page will raise an exception.
.It Cd options REALBASEMEM=integer
Overrides the base memory size passed in from the boot block.
(Value given in kilobytes.)
