Changeset 41757 in vbox for trunk/src/VBox/Devices/PC/BIOS-new/pmode.inc

Timestamp:

Jun 15, 2012 2:26:29 PM (13 years ago)

Author:

vboxsync

Message:

BIOS: Load nicer value into DS before exiting PM.

File:

• trunk/src/VBox/Devices/PC/BIOS-new/pmode.inc (modified) (3 diffs)

trunk/src/VBox/Devices/PC/BIOS-new/pmode.inc

@@ -48 +48 @@
 pmode_exit      proc    near
 
-                mov     ax, 28h         ; Ensure RM limit/attributes
-                mov     ds, ax
+                mov     ax, 40h         ; Ensure RM limit/attributes
+                mov     ds, ax          ; (where base = selector << 4)
 
                 mov     eax, cr0
@@ -64 +64 @@
 
 pmbios_gdt_desc:
-                dw      30h
+                dw      40h + 7                 ; last selector plus 8 - 1
                 dw      pmbios_gdt
                 dw      000Fh
@@ -75 +75 @@
                 dw 0ffffh, 0, 9b0fh, 0000h      ; 16-bit code, base=0xf0000
                 dw 0ffffh, 0, 9300h, 0000h      ; 16-bit data, base=0x0
+                dw 0, 0, 0, 0
+                dw 0, 0, 0, 0
+                dw 0ffffh, 400h, 9300h, 0000h   ; 16-bit data, base=0x40