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;; pci.asm
;; PCI Bus
%define PCI_ENABLE 0x80000000
%define PCI_CONFIG_ADDR_1 0xcf8
%define PCI_CONFIG_ADDR_2 0xcfc
%define PCI_SLOT_EMPTY 0xffff
%define PCI_SLOT_COUNT 32
pci_config_read_word:
enter
movzx ebx, word [ebp + 8] ; bus
movzx edx, word [ebp + 12] ; slot
movzx ecx, word [ebp + 16] ; func
movzx eax, word [ebp + 20] ; offset
shl ebx, 16
shl edx, 11
shl ecx, 8
and eax, 0xfc
or eax, ecx
or eax, edx
or eax, ebx
or eax, 0x80000000
mov dx, PCI_CONFIG_ADDR_1 ; write address
out dx, eax
mov dx, PCI_CONFIG_ADDR_2 ; read data
in dx, eax
movzx ecx, word [ebp + 20] ; offset
and ecx, 2
imul ecx, ecx, 8
shr eax, cl
and ax, 0xffff
leave
ret
pci_config_get_vendor:
enter
movzx ebx, word [ebp + 8] ; bus
movzx edx, word [ebp + 12] ; device
movzx ecx, word [ebp + 16] ; func
push 0
push ecx
push edx
push ebx
call pci_config_read_word
leave
ret
pci_config_get_device:
enter
movzx ebx, word [ebp + 8] ; bus
movzx edx, word [ebp + 12] ; device
movzx ecx, word [ebp + 16] ; func
push 2
push ecx
push edx
push ebx
call pci_config_read_word
leave
ret
pci_config_get_class:
enter
movzx ebx, word [ebp + 8] ; bus
movzx edx, word [ebp + 12] ; device
movzx ecx, word [ebp + 16] ; func
push 0xa
push ecx
push edx
push ebx
call pci_config_read_word
xor esi, esi
not esi, 0xff00
and eax, esi
leave
ret
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