Information about BIOS and the boot process
ivan at munix.com.br
Fri Mar 28 11:10:01 CET 2003
ron minnich wrote:
>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,
But, other ask... Ok , the CS point to the last accessible segment, and
IP to the last addess less 16 bytes...
What I do not understand is, how the bios data go to there (may be
funny to you, so I dont find nothing documentation about)...
I ask it because a common bios have 256k and the segment which the
processor point is 752Kbytes far...
... so I guess I am not imagining right.
>and most BIOSes (linuxbios too) do a jump cs:ip to 0xf000:0x0, which
pops the CPU into the
>old 8086 real mode.
Ivan Gustavo Munix dos Santos
mailto:ivan at munix.com.br
Av. Heitor Vila lobos, 1565
Fone: 12-39232925 Ramal 215
Sao Jose Dos Campos - SP
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