kolibrios/kernel/branches/Kolibri-acpi/bus/pci/pci16.inc

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; PCI16.INC ;;
;; ;;
;; 16 bit PCI driver code ;;
;; ;;
;; Version 0.2 December 21st, 2002 ;;
;; ;;
;; Author: Victor Prodan, victorprodan@yahoo.com ;;
;; ;;
;; See file COPYING for details ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
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