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129 | mikedld | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; PCI16.INC ;; |
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4 | ;; ;; |
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5 | ;; 16 bit PCI driver code ;; |
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6 | ;; ;; |
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7 | ;; Version 0.2 December 21st, 2002 ;; |
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8 | ;; ;; |
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9 | ;; Author: Victor Prodan, victorprodan@yahoo.com ;; |
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10 | ;; ;; |
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11 | ;; See file COPYING for details ;; |
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12 | ;; ;; |
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13 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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14 | |||
15 | |||
16 | init_pci_16: |
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17 | |||
18 | pushad |
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19 | |||
20 | xor ax,ax |
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21 | mov es,ax |
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22 | mov byte [es:0x9020],1 ;default mechanism:1 |
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23 | mov ax,0xb101 |
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24 | int 0x1a |
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25 | or ah,ah |
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26 | jnz pci16skip |
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27 | |||
28 | mov [es:0x9021],cl ;last PCI bus in system |
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29 | mov [es:0x9022],bx |
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30 | mov [es:0x9024],edi |
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31 | |||
32 | ; we have a PCI BIOS, so check which configuration mechanism(s) |
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33 | ; it supports |
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34 | ; AL = PCI hardware characteristics (bit0 => mechanism1, bit1 => mechanism2) |
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35 | test al,1 |
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36 | jnz pci16skip |
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37 | test al,2 |
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38 | jz pci16skip |
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39 | mov byte [es:0x9020],2 ; if (al&3)==2 => mechanism 2 |
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40 | |||
41 | pci16skip: |
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42 | |||
43 | mov ax,0x1000 |
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44 | mov es,ax |
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45 | |||
46 | popad |