e820
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e820 is shorthand for the facility by which the BIOS of an x86-based computer system reports the memory map to the operating system or boot loader.[1]
It is accessed via the int 15h call, by setting the Template:Mono register to value E820 in hexadecimal.
It reports which memory address ranges are usable and which are reserved for use by the BIOS.[2]
BIOS-e820 is often the first thing reported by a booting Linux kernel, and it can also be seen with the dmesg command.