144 lines
2.5 KiB
PHP
144 lines
2.5 KiB
PHP
;; File: memory.inc
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;; Detect available memory
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;;
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;; Constants: Address type
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;;
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;; See <AddressRange.Type>
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;;
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;; ADDRESS_RANGE_MEMORY - Available and usable RAM.
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;; ADDRESS_RANGE_RESERVED - Reserved or in use.
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ADDRESS_RANGE_MEMORY = 1
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ADDRESS_RANGE_RESERVED = 2
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;; Struct: AddressRange
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struc E820AddressRange
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{
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;; Variable: BaseAddrLow
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;; Low 32 Bits of Base Address
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.BaseAddrLow dd ?
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;; Variable: BaseAddrHigh
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;; High 32 Bits of Base Address
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.BaseAddrHigh dd ?
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;; Variable: LengthLow
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;; Low 32 Bits of Length in Bytes
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.LengthLow dd ?
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;; Variable: LengthHigh
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;; High 32 Bits of Length in Bytes
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.LengthHigh dd ?
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;; Variable: Type
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;; Address type of this range. <Address type>
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.Type dd ?
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}
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;; Function: memory_e820_get_mmap_entry
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;;
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;; In:
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;; EAX - Function code
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;; EBX - Continuation
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;; ES:DI - Buffer Pointer
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;; ECX - Buffer size
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;; EDX - Signature 'SMAP'
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;;
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;; Out:
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;; CF - Carry Flag
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;; EAX - Signature 'SMAP'
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;; ES:DI - Buffer Pointer
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;; ECX - Buffer Size
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;; EBX - Continuation
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memory_e820_get_map:
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xor ebx, ebx
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@@:
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clc
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xor eax, eax
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mov es, ax
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mov di, pE280AddrRange
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mov ecx, 20
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mov eax, 0xE820
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mov edx, 'PAMS'
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int 0x15
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jc .error
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cmp eax, 'PAMS'
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jne .error
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or ebx, ebx
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jz .end
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cmp [pE280AddrRange.Type], 0x1
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jne @b
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mov ecx, [pE280AddrRange.BaseAddrHigh]
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or ecx, ecx
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jnz @b
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mov ecx, [pE280AddrRange.LengthHigh]
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or ecx, ecx
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jnz @b
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mov edx, [pE280AddrRange.LengthLow]
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mov eax, [pE280AddrRange.BaseAddrLow]
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call boot_info_add_memmap
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jmp @b
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.error:
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stc
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.end:
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ret
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;; Function: memory_get_for_large_conf
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;;
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;; In:
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;; AX - Function code E801h
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;;
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;; Out:
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;; CF - Non-Carry - indicates no error
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;; AX - Extended 1
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;; BX - Extended 2
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;; CX - Configured 1
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;; DX - Configured 2
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memory_get_for_large_conf:
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clc
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mov ax, 0xE801
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int 0x15
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jc @f
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movzx edx, ax
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mov eax, 0x100000 ; 1MB
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call boot_info_add_memmap
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mov eax, 0x1000000 ; 16MB
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movzx edx, bx
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shl edx, 16 ; * 64KB
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call boot_info_add_memmap
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@@:
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ret
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;; Function: memory_get_extended_memory_size
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;;
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;; In:
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;; AH - Function code 88h
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;;
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;; Out:
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;; CF - Non-Carry - indicates no error
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;; AX - Number of contiguous KB above 1MB
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memory_get_map:
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call memory_e820_get_map
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jnc .end
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call memory_get_for_large_conf
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jnc .end
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clc
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mov ah, 0x88
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int 0x15
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jc .end
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movzx edx, ax
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mov eax, 0x100000
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call boot_info_add_memmap
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.end:
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ret
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pE280AddrRange E820AddressRange
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