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shifted PBS loader to not overlap with FAT32 header

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ment 2011-04-27 23:19:30 +02:00
parent d1a1034cbe
commit 1cd8b4c9b4
1 changed files with 21 additions and 4 deletions
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25
sys/src/boot/pc/pbs.s
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@ -4,7 +4,7 @@
#define RELOC 0x7c00
TEXT _magic(SB), $0
BYTE $0xEB; BYTE $0x3C; /* jmp .+ 0x3C (_start0x3E) */
BYTE $0xEB; BYTE $0x58; /* jmp .+ 0x58 (_start0x5A) */
BYTE $0x90 /* nop */
TEXT _version(SB), $0
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00;
@ -35,9 +35,26 @@ TEXT _nhiddenhi(SB), $0
BYTE $0x00; BYTE $0x00;
TEXT _bigvolsize(SB), $0
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00;
/* FAT32 structure, starting @0x24 */
TEXT _fatsz32(SB), $0
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00
TEXT _extflags(SB), $0
BYTE $0x00; BYTE $0x00
TEXT _fsver(SB), $0
BYTE $0x00; BYTE $0x00
TEXT _rootclust(SB), $0
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00
TEXT _fsinfo(SB), $0
BYTE $0x00; BYTE $0x00
TEXT _bkboot(SB), $0
BYTE $0x00; BYTE $0x00
TEXT _reserved0(SB), $0
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00;
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00;
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00
TEXT _driveno(SB), $0
BYTE $0x00
TEXT _reserved0(SB), $0
TEXT _reserved1(SB), $0
BYTE $0x00
TEXT _bootsig(SB), $0
BYTE $0x00
@ -49,9 +66,9 @@ TEXT _label(SB), $0
BYTE $0x00; BYTE $0x00; BYTE $0x00
TEXT _type(SB), $0
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00;
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00;
BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x00
_start0x3E:
_start0x5A:
CLI
CLR(rAX)
MTSR(rAX, rSS) /* 0000 -> rSS */