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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 425 | victor | 1 | $Revision: 425 $ |
| 1 | ha | 2 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| 3 | ;; ;; |
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| 4 | ;; PCI16.INC ;; |
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| 5 | ;; ;; |
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| 6 | ;; 16 bit PCI driver code ;; |
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| 7 | ;; ;; |
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| 8 | ;; Version 0.2 December 21st, 2002 ;; |
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| 9 | ;; ;; |
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| 10 | ;; Author: Victor Prodan, victorprodan@yahoo.com ;; |
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| 11 | ;; ;; |
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| 12 | ;; See file COPYING for details ;; |
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| 13 | ;; ;; |
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| 14 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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| 15 | |||
| 16 | |||
| 17 | init_pci_16: |
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| 18 | |||
| 19 | pushad |
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| 20 | |||
| 21 | xor ax,ax |
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| 22 | mov es,ax |
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| 23 | mov byte [es:0x9020],1 ;default mechanism:1 |
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| 24 | mov ax,0xb101 |
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| 25 | int 0x1a |
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| 26 | or ah,ah |
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| 27 | jnz pci16skip |
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| 28 | |||
| 29 | mov [es:0x9021],cl ;last PCI bus in system |
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| 30 | mov [es:0x9022],bx |
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| 31 | mov [es:0x9024],edi |
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| 32 | |||
| 33 | ; we have a PCI BIOS, so check which configuration mechanism(s) |
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| 34 | ; it supports |
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| 35 | ; AL = PCI hardware characteristics (bit0 => mechanism1, bit1 => mechanism2) |
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| 36 | test al,1 |
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| 37 | jnz pci16skip |
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| 38 | test al,2 |
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| 39 | jz pci16skip |
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| 40 | mov byte [es:0x9020],2 ; if (al&3)==2 => mechanism 2 |
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| 41 | |||
| 42 | pci16skip: |
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| 43 | |||
| 44 | mov ax,0x1000 |
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| 45 | mov es,ax |
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| 46 | |||
| 47 | popad |