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fixed multiboot booting

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This commit is contained in:
aiju 2012-07-13 18:09:42 +02:00
parent 8e11ff283f
commit c03913c62d
1 changed files with 17 additions and 1 deletions
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18
sys/src/9/pc/l.s
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@ -46,12 +46,28 @@ TEXT _multibootheader(SB), $0
LONG $_startKADDR-KZERO(SB) /* load_addr */
LONG $edata-KZERO(SB) /* load_end_addr */
LONG $end-KZERO(SB) /* bss_end_addr */
LONG $_startKADDR-KZERO(SB) /* entry_addr */
LONG $_multibootentry-KZERO(SB) /* entry_addr */
LONG $0 /* mode_type */
LONG $0 /* width */
LONG $0 /* height */
LONG $0 /* depth */
TEXT _multibootentry(SB), $0
MOVL $etext-KZERO(SB), SI
MOVL SI, DI
ADDL $0xfff, DI
ANDL $~0xfff, DI
MOVL $edata-KZERO(SB), CX
SUBL DI, CX
ADDL CX, SI
ADDL CX, DI
STD
REP; MOVSB
CLD
MOVL $_startPADDR(SB), AX
ANDL $~KZERO, AX
JMP* AX
/*
* In protected mode with paging turned off and segment registers setup
* to linear map all memory. Entered via a jump to PADDR(entry),