Add various constants for the PAT MSR and the PAT PTE and PDE flags.

Initialize the PAT MSR during boot to map PAT type 2 to Write-Combining
(WC) instead of Uncached (UC-).

MFC after:	1 month

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/amd64/include/pmap.h b/sys/amd64/include/pmap.h
index 0a774c7..bfecade 100644
--- a/sys/amd64/include/pmap.h
+++ b/sys/amd64/include/pmap.h
@@ -58,10 +58,12 @@
 #define PG_A		0x020	/* A	Accessed		*/
 #define	PG_M		0x040	/* D	Dirty			*/
 #define	PG_PS		0x080	/* PS	Page size (0=4k,1=4M)	*/
+#define	PG_PTE_PAT	0x080	/* PAT	PAT index		*/
 #define	PG_G		0x100	/* G	Global			*/
 #define	PG_AVAIL1	0x200	/*    /	Available for system	*/
 #define	PG_AVAIL2	0x400	/*   <	programmers use		*/
 #define	PG_AVAIL3	0x800	/*    \				*/
+#define	PG_PDE_PAT	0x1000	/* PAT	PAT index		*/
 #define	PG_NX		(1ul<<63) /* No-execute */
 
 
@@ -300,6 +302,7 @@ extern vm_offset_t virtual_end;
 #define	pmap_page_is_mapped(m)	(!TAILQ_EMPTY(&(m)->md.pv_list))
 
 void	pmap_bootstrap(vm_paddr_t *);
+void	pmap_init_pat(void);
 void	pmap_kenter(vm_offset_t va, vm_paddr_t pa);
 void	*pmap_kenter_temporary(vm_paddr_t pa, int i);
 vm_paddr_t pmap_kextract(vm_offset_t);