Information about BIOS and the boot process

ron minnich rminnich at lanl.gov
Fri Mar 28 08:58:59 CET 2003


On Fri, 28 Mar 2003, SONE Takeshi wrote:

> CPU starts with last 16 byte of address space.
> On a 386 or later it's FFFFFFF:0000??

CPU starts out in "big real mode" at 0xffff0000, and most BIOSes 
(linuxbios too) do a jump cs:ip to 0xf000:0x0, which pops the CPU into the 
old 8086 real mode.

kron




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