124 lines
2.9 KiB
NASM
124 lines
2.9 KiB
NASM
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MAIN_BIOS_AREA_START equ 0xe0000
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; Arguments:
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; [Furthest from EBP]
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; 1. Pointer to RSDT
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; 0. Pointer to driver area of 65536 bytes
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; [Nearest to EBP]
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acpi_enumerate_tables:
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.prolog:
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push esi
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sub esp, 32
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mov esi, esp
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mov [esi + (32 - 4)], eax
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mov [esi + (32 - 8)], ebx
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mov [esi + (32 - 12)], ecx
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mov [esi + (32 - 16)], edx
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mov [esi + (32 - 20)], edi
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; ESI + 4: Number of RSDT entries
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; ESI + 8: Start of RSDT's entries
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.get_table_metrics:
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; First, get the length of the full RSDT with header
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mov ebx, [ebp + 8]
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mov eax, [ebx + 4]
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; Subtract the length of the RSDT's header to just get
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; the length of all the table
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sub eax, 36
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; Save the value for later, to get the start of the entries.
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mov edx, eax
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; Divide through 4 to get the number of entries
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shr eax, 2
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mov [esi + 4], eax
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; Save the table entries' start
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add edx, [ebp + 4]
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mov [esi + 4], edx
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.initialize_enumeration_loop:
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xor ecx, ecx
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.enumeration_loop:
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cmp ecx, [esi + 4]
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; Calculate the address of the current entry
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mov eax, ecx
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shl eax, 2
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mov ebx, [esi + 8]
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add ebx, eax
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mov eax, [ebx]Z
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inc ecx
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jmp .enumeration_loop
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.epilog:
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mov edi, [esi + (32 - 20)]
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mov edx, [esi + (32 - 16)]
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mov ecx, [esi + (32 - 12)]
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mov ebx, [esi + (32 - 8)]
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mov eax, [esi + (32 - 4)]
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add esp, 32
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pop esi
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ret
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; Arguments:
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; -- None --
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acpi_search_rsdt:
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.prolog:
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push esi
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sub esp, 8
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mov esi, esp
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mov [esi], dword 0
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mov [esi + 4], ecx
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.search_loop_header:
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mov ecx, MAIN_BIOS_AREA_START
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.search_loop:
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push ebp
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mov ebp, esp
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push ecx
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push dword .signature
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push dword 8
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call mem_equal
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mov esp, ebp
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pop ebp
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cmp ax, 0
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jne .rsdp_found
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add ecx, 16
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cmp ecx, 0x100000
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jb .search_loop
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; If no "RSD PTR "-signature could be found
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xor ecx, ecx
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.resolve_rsdp:
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; The 4-byte RSDT-pointer is at byte-offset 4 into the RSDP strucfture.
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mov eax, ecx
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add eax, 4
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mov eax, [eax]
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.epilog:
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mov ecx, [esi + 4]
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add esp, 8
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pop esi
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ret
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.signature:
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db "RSD PTR "
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