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Make the comment about PDPpaddr more thorough.

This commit is contained in:
jym 2010-07-15 19:02:26 +00:00
parent d3c610129a
commit 7d13a50ab2
1 changed files with 7 additions and 2 deletions
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9
sys/arch/x86/include/pmap.h
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.h,v 1.31 2010/07/06 20:50:35 cegger Exp $ */
/* $NetBSD: pmap.h,v 1.32 2010/07/15 19:02:26 jym Exp $ */
/*
*
@ -183,7 +183,12 @@ struct pmap {
* global kernel variables
*/
/* PDPpaddr: is the physical address of the kernel's PDP */
/*
* PDPpaddr is the physical address of the kernel's PDP.
* - i386 non-PAE and amd64: PDPpaddr corresponds directly to the %cr3
* value associated to the kernel process, proc0.
* - Xen: it corresponds to the PFN of the kernel's PDP.
*/
extern u_long PDPpaddr;
extern int pmap_pg_g; /* do we support PG_G? */