2 files changed, 8 insertions(+), 1 deletions(-)

M pc/mem.h
M pc/mmu.c

@@ 109,7 109,8 @@
  *  physical MMU
  */
 #define	PTEVALID	(1<<0)
-#define	PTEUNCACHED	(1<<4)	
+#define	PTEWT		(1<<3)
+#define	PTEUNCACHED	(1<<4)
 #define PTEWRITE	(1<<1)
 #define	PTERONLY	(0<<1)
 #define	PTEKERNEL	(0<<2)

@@ 168,6 168,12 @@ mmuinit(void)
 	kpt = xspanalloc(nbytes, BY2PG, 0);
 	for(i = 0; i < npage; i++)
 		kpt[i] = (0+i*BY2PG) | PTEVALID | PTEKERNEL | PTEWRITE;
+	for(i = 0xa0000/BY2PG; i < 0xC0000/BY2PG; i++)
+		kpt[i] = (0+i*BY2PG) | PTEVALID | PTEKERNEL | PTEWRITE | PTEWT;
+	for(i = 0xC0000/BY2PG; i < MB/BY2PG; i++)
+		kpt[i] = (0+i*BY2PG) | PTEVALID | PTEKERNEL | PTEWRITE | PTEUNCACHED;
+	for(i = conf.topofmem/BY2PG; i < 128*MB/BY2PG; i++)
+		kpt[i] = (0+i*BY2PG) | PTEVALID | PTEKERNEL | PTEWRITE | PTEUNCACHED;
 	x = TOPOFF(KZERO);
 	y = ((ulong)kpt)&~KZERO;
 	for(i = 0; i < nkpt; i++)