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Rev 387 Rev 417
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        jne  no_pci_access_for_applications
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        jne  no_pci_access_for_applications
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        or al,al
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        or al,al
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        jnz pci_fn_1
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        jnz pci_fn_1
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        ; PCI function 0: get pci version (AH.AL)
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        ; PCI function 0: get pci version (AH.AL)
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        movzx eax,word [0x2F0000+0x9022]
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        movzx eax,word [BOOT_VAR+0x9022]
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        ret
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        ret
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pci_fn_1:
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pci_fn_1:
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        cmp al,1
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        cmp al,1
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        jnz pci_fn_2
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        jnz pci_fn_2
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        ; PCI function 1: get last bus in AL
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        ; PCI function 1: get last bus in AL
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        mov al,[0x2F0000+0x9021]
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        mov al,[BOOT_VAR+0x9021]
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        ret
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        ret
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pci_fn_2:
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pci_fn_2:
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        cmp al,2
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        cmp al,2
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        jne pci_fn_3
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        jne pci_fn_3
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        ; PCI function 2: get pci access mechanism
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        ; PCI function 2: get pci access mechanism
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        mov al,[0x2F0000+0x9020]
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        mov al,[BOOT_VAR+0x9020]
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;***************************************************************************
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;***************************************************************************
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align 4
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align 4
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pci_read_reg:
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pci_read_reg:
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        cmp     byte [0x2F0000+0x9020],2 ;what mechanism will we use?
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        cmp     byte [BOOT_VAR+0x9020],2 ;what mechanism will we use?
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        je      pci_read_reg_2
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        je      pci_read_reg_2
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;***************************************************************************
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;***************************************************************************
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align 4
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align 4
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pci_write_reg:
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pci_write_reg:
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        cmp byte [0x2F0000+0x9020],2 ;what mechanism will we use?
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        cmp byte [BOOT_VAR+0x9020],2 ;what mechanism will we use?
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        je pci_write_reg_2
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        je pci_write_reg_2
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