kolibrios/kernel/trunk/bus/pci/pci16.inc

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                              ;;
;; 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:BOOT_PCI_DATA], 1;default mechanism:1
        mov     ax, 0xb101
        int     0x1a
        or      ah, ah
        jnz     pci16skip

        mov     [es:BOOT_PCI_DATA+1], cl;last PCI bus in system
        mov     [es:BOOT_PCI_DATA+2], bx
        mov     [es:BOOT_PCI_DATA+4], 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:BOOT_PCI_DATA], 2; if (al&3)==2 => mechanism 2

pci16skip:

        mov     ax, 0x1000
        mov     es, ax

        popad