Changeset 1433 in vbox for trunk/src/VBox/Devices/PC/BIOS

Timestamp:

Mar 12, 2007 6:09:31 PM (18 years ago)

Author:

vboxsync

Message:

Perform software reset of pcnet device(s) in the BIOS. This makes sure no misconfigured busmaster access is performed if the guest reboots
without toggling the reset line (otherwise the device is left running and can destroy memory contents in the descriptors and receive
buffers).

File:

• trunk/src/VBox/Devices/PC/BIOS/rombios.c (modified) (4 diffs)

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

@@ -9852 +9852 @@
   cmp  ax, #0xffff
   jz   next_pci_dev
+#ifndef VBOX /* This currently breaks restoring a previously saved state. */
   mov  dl, #0x04 ;; disable i/o and memory space access
   call pcibios_init_sel_reg
@@ -9902 +9903 @@
   mov  byte ptr[bp-8], al
   jmp  pci_init_io_loop2
+#endif /* !VBOX */
 enable_iomem_space:
   mov  dl, #0x04 ;; enable i/o and memory space access if available
@@ -9909 +9911 @@
   or   al, #0x07
   out  dx, al
+#ifdef VBOX
+  mov  dl, #0x00 ;; check if PCI device is AMD PCNet
+  call pcibios_init_sel_reg
+  mov  dx, #0x0cfc
+  in   eax, dx
+  cmp  eax, #0x20001022
+  jne  next_pci_dev
+  mov  dl, #0x10 ;; get I/O address
+  call pcibios_init_sel_reg
+  mov  dx, #0x0cfc
+  in   ax, dx
+  and  ax, #0xfffc
+  mov  cx, ax
+  mov  dx, cx
+  add  dx, #0x14 ;; reset register if PCNet is in word I/O mode
+  in   ax, dx    ;; reset is performed by reading the reset register
+  mov  dx, cx
+  add  dx, #0x18 ;; reset register if PCNet is in word I/O mode
+  in   eax, dx   ;; reset is performed by reading the reset register
+#endif /* VBOX */
 next_pci_dev:
   mov  byte ptr[bp-8], #0x10
@@ -10594 +10616 @@
   call rombios32_init
 #else
-#if 0 /* This currently breaks restoring a previously saved state. */
   call pcibios_init_iomem_bases
-#endif
   call pcibios_init_irqs
 #endif