Add support for 4MB pages. This includes the .text, .data, .data parts

of the kernel, and also most of the dynamic parts of the kernel.  Additionally,
4MB pages will be allocated for display buffers as appropriate (only.)

The 4MB support for SMP isn't complete, but doesn't interfere with operation
either.

1 files changed, 20 insertions, 6 deletions

diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h
index f00d4f2..3265129 100644
--- a/sys/i386/include/pmap.h
+++ b/sys/i386/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 1.50 1997/04/26 11:45:41 peter Exp $
+ * 	$Id: pmap.h,v 1.51 1997/06/22 16:03:54 peter Exp $
  */
 
 #ifndef _MACHINE_PMAP_H_
@@ -144,6 +144,7 @@ extern pd_entry_t PTD[], APTD[], PTDpde, APTDpde, Upde;
 extern pd_entry_t IdlePTD;	/* physical address of "Idle" state directory */
 #endif
 
+#ifdef KERNEL
 /*
  * virtual address to page table entry and
  * to physical address. Likewise for alternate address space.
@@ -151,12 +152,9 @@ extern pd_entry_t IdlePTD;	/* physical address of "Idle" state directory */
  * the corresponding pde that in turn maps it.
  */
 #define	vtopte(va)	(PTmap + i386_btop(va))
-#define	vtophys(va)	(((int) (*vtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
 
 #define	avtopte(va)	(APTmap + i386_btop(va))
-#define	avtophys(va)	(((int) (*avtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
 
-#ifdef KERNEL
 /*
  *	Routine:	pmap_kextract
  *	Function:
@@ -166,10 +164,24 @@ extern pd_entry_t IdlePTD;	/* physical address of "Idle" state directory */
 static __inline vm_offset_t
 pmap_kextract(vm_offset_t va)
 {
-	vm_offset_t pa = *(int *)vtopte(va);
-	pa = (pa & PG_FRAME) | (va & PAGE_MASK);
+	vm_offset_t pa;
+	if ((pa = (vm_offset_t) PTD[va >> PDRSHIFT]) & PG_PS) {
+		pa = (pa & ~(NBPDR - 1)) | (va & (NBPDR - 1));
+	} else {
+		pa = *(vm_offset_t *)vtopte(va);
+		pa = (pa & PG_FRAME) | (va & PAGE_MASK);
+	}
 	return pa;
 }
+
+#if 0
+#define	vtophys(va)	(((int) (*vtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
+#else
+#define	vtophys(va)	pmap_kextract(((vm_offset_t) (va)))
+#endif
+
+#define	avtophys(va)	(((int) (*avtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
+
 #endif
 
 /*
@@ -237,6 +249,8 @@ pmap_t	pmap_kernel __P((void));
 void	*pmap_mapdev __P((vm_offset_t, vm_size_t));
 unsigned *pmap_pte __P((pmap_t, vm_offset_t)) __pure2;
 vm_page_t pmap_use_pt __P((pmap_t, vm_offset_t));
+void	pmap_set_opt	__P((unsigned *));
+void	pmap_set_opt_bsp	__P((void));
 
 #endif /* KERNEL */