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linux 0.11 ÄÚºËѧϰ setup.s

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! setup³ÌÐòµÄÖ÷Òª×÷ÓÃÊÇÀûÓÃrom biosµÄÖжÏÀ´¶ÁÈ¡»úÆ÷ϵͳ²ÎÊý£¬²¢½«ÕâЩÊý¾Ý±£´æÔÚ0x90000
! ¿ªÊ¼µÄλÖÃ(¸²¸ÇµôÁËbootsect³ÌÐòËùÔÚµÄλÖÃ)£¬ËùÈ¡µÃµÄ²ÎÊý±»Äں˵ÄÏà¹Ø³ÌÐòʹÓá£×¢ÒâÔÚbootsect
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! setup.s  (C) 1991 Linus Torvalds
!
! setup.s is responsible for getting the system data from the BIOS,
! and putting them into the appropriate places in system memory.
! both setup.s and system has been loaded by the bootblock.
!
! This code asks the bios for memory/disk/other parameters, and
! puts them in a "safe" place: 0x90000-0x901FF, ie where the
! boot-block used to be. It is then up to the protected mode
! system to read them from there before the area is overwritten
! for buffer-blocks.
!
! NOTE! These had better be the same as in bootsect.s!
INITSEG  = 0x9000 ! we move boot here - out of the way£¬Ô­À´µÄbootsect¶Î
SYSSEG   = 0x1000 ! system loaded at 0x10000 (65536).systemËùÔÚ¶Î
SETUPSEG = 0x9020 ! this is the current segment£¬±¾³ÌÐòËùÔÚ¶Î
.globl begtext, begdata, begbss, endtext, enddata, endbss
.text
begtext:
.data
begdata:
.bss
begbss:
.text
entry start
start:
! ok, the read went well so we get current cursor position and save it for
! posterity.
! Õû¸ö¶Á´ÅÅ̵Ĺý³Ì¶¼ºÜ˳Àû£¬ÏÖÔÚ½«¹â±êλÖñ£´æÒÔ±¸ºó


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