From: Erik van der Kouwe <erikvdk@gmail.com>
Date: Sat, 12 Mar 2011 07:43:40 +0000 (-0600)
Subject: Windows XP uses the "get irq routing options" PCIBIOS function early in boot. This... 
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=6ddfbbe29e026890254dace913cc75c12caa4a18;p=palacios.git

Windows XP uses the "get irq routing options" PCIBIOS function early in boot. This patch add it. the code is taken from the BOCHS BIOS, where it has been implemented after this version of the BIOS was taken for Palacios.
---

diff --git a/bios/rombios/rombios.c b/bios/rombios/rombios.c
index f754bad..1e1af50 100644
--- a/bios/rombios/rombios.c
+++ b/bios/rombios/rombios.c
@@ -9399,7 +9399,7 @@ pci_real_f0c: ;; write configuration word
   jmp pci_real_ok
 pci_real_f0d: ;; write configuration dword
   cmp al, #0x0d
-  jne pci_real_unknown
+  jne pci_real_f0e
   call pci_real_select_reg
   push dx
   mov dx, #0x0cfc
@@ -9407,6 +9407,46 @@ pci_real_f0d: ;; write configuration dword
   out dx, eax
   pop dx
   jmp pci_real_ok
+pci_real_f0e: ;; get irq routing options
+  cmp al, #0x0e
+  jne pci_real_unknown
+  SEG ES
+  cmp word ptr [di], #pci_routing_table_structure_end - pci_routing_table_structure_start
+  jb pci_real_too_small
+  SEG ES
+  mov word ptr [di], #pci_routing_table_structure_end - pci_routing_table_structure_start
+  pushf
+  push ds
+  push es
+  push cx
+  push si
+  push di
+  cld
+  mov si, #pci_routing_table_structure_start
+  push cs
+  pop ds
+  SEG ES
+  mov cx, [di+2]
+  SEG ES
+  mov es, [di+4]
+  mov di, cx
+  mov cx, #pci_routing_table_structure_end - pci_routing_table_structure_start
+  rep
+      movsb
+  pop di
+  pop si
+  pop cx
+  pop es
+  pop ds
+  popf
+  mov bx, #(1 << 9) | (1 << 11)   ;; irq 9 and 11 are used
+  jmp pci_real_ok
+pci_real_too_small:
+  SEG ES
+  mov word ptr [di], #pci_routing_table_structure_end - pci_routing_table_structure_start
+  mov ah, #0x89
+  jmp pci_real_fail
+
 pci_real_unknown:
   mov ah, #0x81
 pci_real_fail:
@@ -9443,10 +9483,11 @@ pci_routing_table_structure:
   db 0x08 ;; PCI interrupt router DevFunc
   dw 0x0000 ;; PCI exclusive IRQs 
   dw 0x8086 ;; compatible PCI interrupt router vendor ID
-  dw 0x7000 ;; compatible PCI interrupt router device ID
+  dw 0x122e ;; compatible PCI interrupt router device ID
   dw 0,0 ;; Miniport data
   db 0,0,0,0,0,0,0,0,0,0,0 ;; reserved
-  db 0x07 ;; checksum
+  db 0x37 ;; checksum
+pci_routing_table_structure_start:
   ;; first slot entry PCI-to-ISA (embedded)
   db 0 ;; pci bus number
   db 0x08 ;; pci device number (bit 7-3)
@@ -9525,6 +9566,7 @@ pci_routing_table_structure:
   dw 0xdef8 ;; IRQ bitmap INTD#
   db 5 ;; physical slot (0 = embedded)
   db 0 ;; reserved
+pci_routing_table_structure_end:
 
 pci_irq_list:
   db 11, 10, 9, 5;