diff options
| author | dg <dg@FreeBSD.org> | 1994-03-24 23:12:48 +0000 |
|---|---|---|
| committer | dg <dg@FreeBSD.org> | 1994-03-24 23:12:48 +0000 |
| commit | d777903222b11321f93bfb1f2767ba08437e3946 (patch) | |
| tree | c53c28fcb5dfd361b564e4bc356d24fcfd42e934 /sys/amd64/include | |
| parent | f4bbdc7da6e18ffed99f492f7865dcaf729ff629 (diff) | |
| download | FreeBSD-src-d777903222b11321f93bfb1f2767ba08437e3946.zip FreeBSD-src-d777903222b11321f93bfb1f2767ba08437e3946.tar.gz | |
From John Dyson: performance improvements to the new bounce buffer
code.
Diffstat (limited to 'sys/amd64/include')
| -rw-r--r-- | sys/amd64/include/pmap.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/sys/amd64/include/pmap.h b/sys/amd64/include/pmap.h index ee2823a..d015bc1 100644 --- a/sys/amd64/include/pmap.h +++ b/sys/amd64/include/pmap.h @@ -42,7 +42,7 @@ * * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91 - * $Id: pmap.h,v 1.10 1994/01/31 04:19:00 davidg Exp $ + * $Id: pmap.h,v 1.11 1994/03/07 11:38:48 davidg Exp $ */ #ifndef _PMAP_MACHINE_ @@ -181,6 +181,21 @@ extern int IdlePTD; /* physical address of "Idle" state directory */ #define avtophys(va) (((int) (*avtopte(va))&PG_FRAME) | ((int)(va) & PGOFSET)) /* + * Routine: pmap_kextract + * Function: + * Extract the physical page address associated + * kernel virtual address. + */ +static inline vm_offset_t +pmap_kextract(va) + vm_offset_t va; +{ + vm_offset_t pa = *(int *)vtopte(va); + pa = (pa & PG_FRAME) | (va & ~PG_FRAME); + return pa; +} + +/* * macros to generate page directory/table indicies */ |
