431,4 → 431,120 |
ret |
endp |
|
uglobal |
align 4 |
acpi_rsdp rd 1 |
acpi_rsdt rd 1 |
acpi_madt rd 1 |
|
acpi_rsdt_base rd 1 |
acpi_madt_base rd 1 |
acpi_lapic_base rd 1 |
acpi_ioapic_base rd 1 |
endg |
|
ACPI_HI_RSDP_WINDOW_START equ 0x000E0000 |
ACPI_HI_RSDP_WINDOW_END equ 0x00100000 |
ACPI_RSDP_CHECKSUM_LENGTH equ 20 |
ACPI_MADT_SIGN equ 0x43495041 |
|
|
acpi_locate: |
push ebx |
mov ebx, ACPI_HI_RSDP_WINDOW_START |
.check: |
cmp [ebx], dword 0x20445352 |
jne .next |
cmp [ebx+4], dword 0x20525450 |
jne .next |
|
mov edx, ebx |
mov ecx, ACPI_RSDP_CHECKSUM_LENGTH |
xor eax, eax |
.sum: |
add al, [edx] |
inc edx |
loop .sum |
|
test al, al |
jnz .next |
|
mov eax, ebx |
pop ebx |
ret |
.next: |
add ebx, 16 |
cmp ebx, ACPI_HI_RSDP_WINDOW_END |
jb .check |
|
pop ebx |
xor eax, eax |
ret |
|
align 4 |
rsdt_find: ;ecx= rsdt edx= SIG |
push ebx |
push esi |
|
lea ebx, [ecx+36] |
mov esi, [ecx+4] |
add esi, ecx |
.next: |
mov eax, [ebx] |
cmp [eax], edx |
je .done |
|
add ebx, 4 |
cmp ebx, esi |
jb .next |
|
xor eax, eax |
pop esi |
pop ebx |
ret |
|
.done: |
mov eax, [ebx] |
pop esi |
pop ebx |
ret |
|
|
align 4 |
|
check_acpi: |
|
call acpi_locate |
test eax, eax |
jz .done |
|
mov ecx, [eax+16] |
mov edx, ACPI_MADT_SIGN |
mov [acpi_rsdt_base-OS_BASE], ecx |
call rsdt_find |
test eax, eax |
jz .done |
|
mov [acpi_madt_base-OS_BASE], eax |
mov ecx, [eax+36] |
mov [acpi_lapic_base-OS_BASE], ecx |
|
lea edx, [eax+44] |
mov ecx, [eax+4] |
add ecx, eax |
.check: |
mov eax, [edx] |
cmp al, 1 |
je .ioapic |
|
.next: |
movzx eax, ah |
add edx, eax |
cmp edx, ecx |
jb .check |
.done: |
ret |
.ioapic: |
mov eax, [edx+4] |
mov [acpi_ioapic_base-OS_BASE], eax |
ret |