128,10 → 128,6 |
align 4 |
|
pci_read_reg: |
cmp byte [BOOT_VAR+0x9020],2 ;what mechanism will we use? |
je pci_read_reg_2 |
|
; mechanism 1 |
push esi ; save register size into ESI |
mov esi,eax |
and esi,3 |
177,67 → 173,7 |
pop eax |
pop esi |
ret |
pci_read_reg_2: |
|
test bh,128 ;mech#2 only supports 16 devices per bus |
jnz pci_read_reg_err |
|
push esi ; save register size into ESI |
mov esi,eax |
and esi,3 |
|
push eax |
;store current state of config space |
mov dx,0xcf8 |
in al,dx |
mov ah,al |
mov dl,0xfa |
in al,dx |
|
xchg eax,[esp] |
; out 0xcfa,bus |
mov al,ah |
out dx,al |
; out 0xcf8,0x80 |
mov dl,0xf8 |
mov al,0x80 |
out dx,al |
; compute addr |
shr bh,3 ; func is ignored in mechanism 2 |
or bh,0xc0 |
mov dx,bx |
|
or esi,esi |
jz pci_read_byte2 |
cmp esi,1 |
jz pci_read_word2 |
cmp esi,2 |
jz pci_read_dword2 |
jmp pci_fin_read2 |
|
pci_read_byte2: |
in al,dx |
jmp pci_fin_read2 |
pci_read_word2: |
in ax,dx |
jmp pci_fin_read2 |
pci_read_dword2: |
in eax,dx |
; jmp pci_fin_read2 |
pci_fin_read2: |
|
; restore configuration space |
xchg eax,[esp] |
mov dx,0xcfa |
out dx,al |
mov dl,0xf8 |
mov al,ah |
out dx,al |
|
pop eax |
pop esi |
ret |
|
pci_read_reg_err: |
xor eax,eax |
dec eax |
259,10 → 195,6 |
align 4 |
|
pci_write_reg: |
cmp byte [BOOT_VAR+0x9020],2 ;what mechanism will we use? |
je pci_write_reg_2 |
|
; mechanism 1 |
push esi ; save register size into ESI |
mov esi,eax |
and esi,3 |
301,7 → 233,6 |
out dx,eax |
jmp pci_fin_write1 |
pci_fin_write1: |
|
; restore configuration control |
pop eax |
mov dl,0xf8 |
309,70 → 240,8 |
|
xor eax,eax |
pop esi |
|
ret |
pci_write_reg_2: |
|
test bh,128 ;mech#2 only supports 16 devices per bus |
jnz pci_write_reg_err |
|
|
push esi ; save register size into ESI |
mov esi,eax |
and esi,3 |
|
push eax |
;store current state of config space |
mov dx,0xcf8 |
in al,dx |
mov ah,al |
mov dl,0xfa |
in al,dx |
xchg eax,[esp] |
; out 0xcfa,bus |
mov al,ah |
out dx,al |
; out 0xcf8,0x80 |
mov dl,0xf8 |
mov al,0x80 |
out dx,al |
; compute addr |
shr bh,3 ; func is ignored in mechanism 2 |
or bh,0xc0 |
mov dx,bx |
; write register |
mov eax,ecx |
|
or esi,esi |
jz pci_write_byte2 |
cmp esi,1 |
jz pci_write_word2 |
cmp esi,2 |
jz pci_write_dword2 |
jmp pci_fin_write2 |
|
pci_write_byte2: |
out dx,al |
jmp pci_fin_write2 |
pci_write_word2: |
out dx,ax |
jmp pci_fin_write2 |
pci_write_dword2: |
out dx,eax |
jmp pci_fin_write2 |
pci_fin_write2: |
; restore configuration space |
pop eax |
mov dx,0xcfa |
out dx,al |
mov dl,0xf8 |
mov al,ah |
out dx,al |
|
xor eax,eax |
pop esi |
ret |
|
pci_write_reg_err: |
xor eax,eax |
dec eax |