Subversion Repositories Kolibri OS

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]