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Rev Author Line No. Line
2293 Serge 1 
format MS COFF
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extrn  _acpi_rsdt_base
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public _acpi_locate
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public @rsdt_find@8
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OS_BASE                    equ 0x80000000
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ACPI_HI_RSDP_WINDOW_START  equ (OS_BASE+0x000E0000)
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ACPI_HI_RSDP_WINDOW_END    equ (OS_BASE+0x00100000)
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ACPI_RSDP_CHECKSUM_LENGTH  equ 20
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section '.text' code readable executable align 16
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_acpi_locate:
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        push ebx
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        mov ebx, ACPI_HI_RSDP_WINDOW_START
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.check:
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        cmp [ebx], dword 0x20445352
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        jne .next
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        cmp [ebx+4], dword 0x20525450
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        jne .next
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        mov edx, ebx
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        mov ecx, ACPI_RSDP_CHECKSUM_LENGTH
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        xor eax, eax
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.sum:
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        add al, [edx]
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        inc edx
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        loop .sum
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        test al, al
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        jnz .next
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        mov eax, ebx
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        pop ebx
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        ret
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.next:
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        add ebx, 16
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        cmp ebx, ACPI_HI_RSDP_WINDOW_END
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        jb .check
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        pop ebx
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        xor eax, eax
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        ret
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align 4
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@rsdt_find@8:           ;ecx= rsdt edx= SIG
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        push ebx
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        push esi
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        lea ebx, [ecx+36]
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        mov esi, [ecx+4]
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        add esi, ecx
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.next:
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        mov eax, [ebx]
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        sub eax, [_acpi_rsdt_base]
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        add eax, ecx
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        cmp [eax], edx
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        je .done
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        add ebx, 4
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        cmp ebx, esi
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        jb .next
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        xor eax, eax
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        pop esi
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        pop ebx
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        ret
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.done:
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        mov eax, [ebx]
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        pop esi
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        pop ebx
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        ret
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