68 lines
1.2 KiB
Diff
68 lines
1.2 KiB
Diff
--- grub-0.97.orig/stage2/asm.S 2004-06-19 18:55:22.000000000 +0200
|
|
+++ grub-0.97/stage2/asm.S 2006-04-21 11:10:52.000000000 +0200
|
|
@@ -1651,7 +1651,29 @@
|
|
jnz 3f
|
|
ret
|
|
|
|
-3: /* use keyboard controller */
|
|
+3: /*
|
|
+ * try to switch gateA20 using PORT92, the "Fast A20 and Init"
|
|
+ * register
|
|
+ */
|
|
+ mov $0x92, %dx
|
|
+ inb %dx, %al
|
|
+ /* skip the port92 code if it's unimplemented (read returns 0xff) */
|
|
+ cmpb $0xff, %al
|
|
+ jz 6f
|
|
+
|
|
+ /* set or clear bit1, the ALT_A20_GATE bit */
|
|
+ movb 4(%esp), %ah
|
|
+ testb %ah, %ah
|
|
+ jz 4f
|
|
+ orb $2, %al
|
|
+ jmp 5f
|
|
+4: and $0xfd, %al
|
|
+
|
|
+ /* clear the INIT_NOW bit don't accidently reset the machine */
|
|
+5: and $0xfe, %al
|
|
+ outb %al, %dx
|
|
+
|
|
+6: /* use keyboard controller */
|
|
pushl %eax
|
|
|
|
call gloop1
|
|
@@ -1661,9 +1683,12 @@
|
|
|
|
gloopint1:
|
|
inb $K_STATUS
|
|
+ cmpb $0xff, %al
|
|
+ jz gloopint1_done
|
|
andb $K_IBUF_FUL, %al
|
|
jnz gloopint1
|
|
|
|
+gloopint1_done:
|
|
movb $KB_OUTPUT_MASK, %al
|
|
cmpb $0, 0x8(%esp)
|
|
jz gdoit
|
|
@@ -1684,6 +1709,8 @@
|
|
|
|
gloop1:
|
|
inb $K_STATUS
|
|
+ cmpb $0xff, %al
|
|
+ jz gloop2ret
|
|
andb $K_IBUF_FUL, %al
|
|
jnz gloop1
|
|
|
|
@@ -1991,6 +2018,11 @@
|
|
ENTRY(console_getkey)
|
|
push %ebp
|
|
|
|
+wait_for_key:
|
|
+ call EXT_C(console_checkkey)
|
|
+ incl %eax
|
|
+ jz wait_for_key
|
|
+
|
|
call EXT_C(prot_to_real)
|
|
.code16
|
|
|