kolibrios-fun/kernel/trunk/bus/pci/pci16.inc
msu-se d5c0fed779 moving to kernel directory
git-svn-id: svn://kolibrios.org@2 a494cfbc-eb01-0410-851d-a64ba20cac60
2005-10-07 04:39:30 +00:00

46 lines
1.5 KiB
PHP

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; PCI16.INC ;;
;; ;;
;; 16 bit PCI driver code ;;
;; ;;
;; Version 0.2 December 21st, 2002 ;;
;; ;;
;; Author: Victor Prodan, victorprodan@yahoo.com ;;
;; ;;
;; See file COPYING for details ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
init_pci_16:
pushad
xor ax,ax
mov es,ax
mov byte [es:0x9020],1 ;default mechanism:1
mov ax,0xb101
int 0x1a
or ah,ah
jnz pci16skip
mov [es:0x9021],cl ;last PCI bus in system
mov [es:0x9022],bx
mov [es:0x9024],edi
; we have a PCI BIOS, so check which configuration mechanism(s)
; it supports
; AL = PCI hardware characteristics (bit0 => mechanism1, bit1 => mechanism2)
test al,1
jnz pci16skip
test al,2
jz pci16skip
mov byte [es:0x9020],2 ; if (al&3)==2 => mechanism 2
pci16skip:
mov ax,0x1000
mov es,ax
popad