119 lines
2.1 KiB
PHP
119 lines
2.1 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 AddressRange
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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 db ?
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}
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defn AddressRange
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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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mov eax, 0xE820
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mov ebx, 0x0
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mov ecx, 'SMAP'
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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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xor ecx, ecx
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mov cx, ax
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push ecx
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mov cx, bx
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push ecx
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mov si, szMsgLarge
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call bios_log
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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_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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xor ebx, ebx
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mov bx, ax
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push ebx
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mov si, szMsgMaxMemKB
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call bios_log
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shr ebx, 2
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push ebx
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mov si, szMsgMaxPage
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call bios_log
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.end:
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ret
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szMsgMaxMemKB db "%x KB above 1MB", 0
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szMsgMaxPage db "%x pages", 0
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szMsgLarge db "%x KB above 1MB - %x * 64 KB above 16MB", 0
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