Changeset 27456 in vbox for trunk/src/VBox

Timestamp:

Mar 17, 2010 4:18:43 PM (15 years ago)

Author:

vboxsync

Message:

BIOS: Do not destroy high word of EBX in int13_harddisk.

File:

• trunk/src/VBox/Devices/PC/BIOS/rombios.c (modified) (3 diffs)

trunk/src/VBox/Devices/PC/BIOS/rombios.c

@@ -5404 +5404 @@
 
   void
-int13_harddisk(EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS)
-  Bit16u EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS;
+int13_harddisk(EHBX, EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS)
+  Bit16u EHBX, EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS;
 {
   Bit32u lba;
@@ -6648 +6648 @@
 
   void
-int13_harddisk(EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS)
-  Bit16u EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS;
+int13_harddisk(EHBX, EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS)
+  Bit16u EHBX, EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS;
 {
   Bit8u    drive, num_sectors, sector, head, status, mod;
@@ -9091 +9091 @@
 
 int13_disk:
-  ;; int13_harddisk modifies high word of EAX
+  ;; int13_harddisk modifies high word of EAX and EBX
   shr   eax, #16
   push  ax
+  shr   ebx, #16
+  push  bx
   call  _int13_harddisk
+  pop   bx
+  shl   ebx, #16
   pop   ax
   shl   eax, #16