2007-03-21 23:58:33 +01:00
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$Revision$
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2005-10-06 19:56:22 +02:00
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; PCI16.INC ;;
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;; ;;
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;; 16 bit PCI driver code ;;
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;; ;;
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;; Version 0.2 December 21st, 2002 ;;
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;; ;;
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;; Author: Victor Prodan, victorprodan@yahoo.com ;;
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;; ;;
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;; See file COPYING for details ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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init_pci_16:
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pushad
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xor ax,ax
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mov es,ax
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mov byte [es:0x9020],1 ;default mechanism:1
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mov ax,0xb101
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int 0x1a
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or ah,ah
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jnz pci16skip
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mov [es:0x9021],cl ;last PCI bus in system
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mov [es:0x9022],bx
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mov [es:0x9024],edi
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; we have a PCI BIOS, so check which configuration mechanism(s)
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; it supports
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; AL = PCI hardware characteristics (bit0 => mechanism1, bit1 => mechanism2)
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test al,1
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jnz pci16skip
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test al,2
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jz pci16skip
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mov byte [es:0x9020],2 ; if (al&3)==2 => mechanism 2
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pci16skip:
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mov ax,0x1000
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mov es,ax
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popad
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