User:Johnburger/Demo/BIOS/RAMMap
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< User:Johnburger | Demo
The BIOS is about the only thing that can know how the PC's RAM is set up, since it's the code that set it up in the first place. The RAMMap BIOS function reports the memory address space layout through a series of calls.
Demo/BIOS/RAMMap.inc
; ; BIOS/RAMMap.inc ; ; These are the definitions for the BIOS RAM Map information handler BIOS.RAMMap.Int EQU 15h BIOS.RAMMap.Fn EQU 0000_E820h BIOS.RAMMap.Magic EQU "PAMS" ; NASM reverses "SMAP" ; This is the BIOS RAMMap structure STRUC BIOS.RAMMap .Base RESQ 1 .Length RESQ 1 .Type RESD 1 .Flags RESD 1 ; Added in later BIOSes ENDSTRUC BIOS.RAMMap.Flags.DontIgnore EQU 0000_0000_0000_0001b