e820
From Wikipedia, the free encyclopedia
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 Page Template:Mono/styles.css has no content.AX 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.
References
- ^ Page Module:Citation/CS1/styles.css has no content."Advanced Configuration and Power Interface Specification" (PDF). Unified Extensible Firmware Interface Forum. 2010-04-05. Retrieved 2020-03-11.
- ^ Page Module:Citation/CS1/styles.css has no content.Erich Boleyn (1996-07-02). "INT 15h, AX=E820h - Query System Address Map". Retrieved 2020-03-11.
