StupidOS/boot/loader/memory.inc

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;; File: memory.inc
;; Detect available memory
;;
;; Constants: Address type
;;
;; See <AddressRange.Type>
;;
;; ADDRESS_RANGE_MEMORY - Available and usable RAM.
;; ADDRESS_RANGE_RESERVED - Reserved or in use.
ADDRESS_RANGE_MEMORY = 1
ADDRESS_RANGE_RESERVED = 2
;; Struct: AddressRange
struc AddressRange
{
;; Variable: BaseAddrLow
;; Low 32 Bits of Base Address
.BaseAddrLow dd ?
;; Variable: BaseAddrHigh
;; High 32 Bits of Base Address
.BaseAddrHigh dd ?
;; Variable: LengthLow
;; Low 32 Bits of Length in Bytes
.LengthLow dd ?
;; Variable: LengthHigh
;; High 32 Bits of Length in Bytes
.LengthHigh dd ?
;; Variable: Type
;; Address type of this range. <Address type>
.Type db ?
}
defn AddressRange
;; Function: memory_e820_get_mmap_entry
;;
;; In:
;; EAX - Function code
;; EBX - Continuation
;; ES:DI - Buffer Pointer
;; ECX - Buffer size
;; EDX - Signature 'SMAP'
;;
;; Out:
;; CF - Carry Flag
;; EAX - Signature 'SMAP'
;; ES:DI - Buffer Pointer
;; ECX - Buffer Size
;; EBX - Continuation
memory_e820_get_map:
mov eax, 0xE820
mov ebx, 0x0
mov ecx, 'SMAP'
ret
;; Function: memory_get_for_large_conf
;;
;; In:
;; AX - Function code E801h
;;
;; Out:
;; CF - Non-Carry - indicates no error
;; AX - Extended 1
;; BX - Extended 2
;; CX - Configured 1
;; DX - Configured 2
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memory_get_for_large_conf:
mov ax, 0xE801
int 0x15
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;; Function: memory_get_extended_memory_size
;;
;; In:
;; AH - Function code 88h
;;
;; Out:
;; CF - Non-Carry - indicates no error
;; AX - Number of contiguous KB above 1MB
memory_get_map:
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clc
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ret