diff options
| author | Owain Ainsworth <oga@cvs.openbsd.org> | 2010-04-20 19:22:07 +0000 |
|---|---|---|
| committer | Owain Ainsworth <oga@cvs.openbsd.org> | 2010-04-20 19:22:07 +0000 |
| commit | 29f073e481c194c218793f207b6e34f134144caf (patch) | |
| tree | c55fc82cca14e2295faa53c069a40b675cb7a354 /sys/arch/amd64/include | |
| parent | bbc9ab4e1014be3fc927f1b2ccc6bd79e93488a7 (diff) | |
Instead of using PWT|PCD for uncached (which is wrong on old cpus and
HARD uncached on anything since the P3), use just PCD which is UC-
(uncached but mtrrs can override it to write combining).
Now kernel mappings of WC-mtrred memory actually get write combining
memory.
the speed up is very very nice.
ok kettenis@, deraadt@, beck@ (who likes his scrollbars non-wibbly)
Diffstat (limited to 'sys/arch/amd64/include')
| -rw-r--r-- | sys/arch/amd64/include/pte.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sys/arch/amd64/include/pte.h b/sys/arch/amd64/include/pte.h index c14138a7e45..16d51cf4fce 100644 --- a/sys/arch/amd64/include/pte.h +++ b/sys/arch/amd64/include/pte.h @@ -1,4 +1,4 @@ -/* $OpenBSD: pte.h,v 1.5 2006/10/16 15:51:26 tom Exp $ */ +/* $OpenBSD: pte.h,v 1.6 2010/04/20 19:22:06 oga Exp $ */ /* $NetBSD: pte.h,v 1.1 2003/04/26 18:39:47 fvdl Exp $ */ /* @@ -106,7 +106,8 @@ typedef u_int64_t pt_entry_t; /* PTE */ #define PG_RW 0x0000000000000002UL /* read-write */ #define PG_u 0x0000000000000004UL /* user accessible */ #define PG_PROT 0x0000000000000006UL -#define PG_N 0x0000000000000018UL /* non-cacheable */ +#define PG_WT 0x0000000000000008UL /* write through */ +#define PG_N 0x0000000000000010UL /* non-cacheable */ #define PG_U 0x0000000000000020UL /* used */ #define PG_M 0x0000000000000040UL /* modified */ #define PG_PS 0x0000000000000080UL /* 2MB page size */ |