代码着色测试

最新推荐文章于 2024-05-13 21:35:58 发布

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代码着色测试

;-----------------------------------------------------------------------
;--===-- FAT12 image file make By G-Spider
;--===-- fasm startOS.asm startOS.img
;-----------------------------------------------------------------------

; here is map of how the FAT12 system is laid out
;|----------------------------------------------------------------------|
;|BootSector| FAT table 1| FAT table 2 | Root Directory| Data Region    |
;|512 bytes | 4,608 bytes| 4,608 bytes | 7,168 bytes | 1,457,664 bytes|
;|1 sector | 9 sectors | 9 sectors   | 14 sectors   | 2,847 sectors |
;|______________________________________________________________________|

struc _DATA def
{
    match d1=,d2=,d3,def
    \{
    .Data dw ((d1-1980) shl 9) or ((d2 and 0fh) shl 5) or (d3 and 1fh)
    \}
}

struc _TIME def
{
    match d1:d2:d3,def
    \{
    .Data dw (d1 shl 11) or ((d2 and 3fh) shl 5) or ((d3 and 0fh) shr 1)
    \}
}
;-----------------------------------------------------------------------
;BootSector
;-----------------------------------------------------------------------
file 'BOOTER.SYS'               ;0号扇区 512Byte

;-----------------------------------------------------------------------
;FAT table 1
;-----------------------------------------------------------------------
FATEntry1:
;db 00h,00h,00h,0ffh,0fh        ;有效位奇:0ffh,0fh 偶:0f0h,0ffh
;占用5个扇区2,3,4,5,6
;占用扇区7
db 00h,00h,00h,03h,40h,00h,05h,60h,00h,0ffh,0ffh,0ffh

FATEntrySize = $-FATEntry1

db 9*512-FATEntrySize dup (0)    ;FAT1 01~09号扇区

;-----------------------------------------------------------------------
;FAT table 2
;-----------------------------------------------------------------------
FATEntry2: rb FATEntrySize
repeat FATEntrySize
  load a byte from FATEntry1+%-1
  store byte a at FATEntry2+%-1
end repeat

db 9*512-FATEntrySize dup (0)    ;FAT1 10~18号扇区

;-----------------------------------------------------------------------
;Root Directory 根目录
;-----------------------------------------------------------------------
RootDir1:                       ;19号扇区
    .Name       db "SYSTEM SYS"
    .Attr       db 20h
    .Reserved   db 0,0,0,0,0,0,0,0,0,0
    .WrtTime    _TIME <21:06:12>
    .WrtDate    _DATA <2011,10,27>
    .FstClus    dw 0002h        ;开始簇号2 (对应FAT table 1的第3字节处)
    .FileSize   dd LOADERSIZE1

RootDir2:                       ;19号扇区
    .Name       db "EXAMPLE1X3D"
    .Attr       db 20h
    .Reserved   db 0,0,0,0,0,0,0,0,0,0
    .WrtTime    _TIME <21:06:12>
    .WrtDate    _DATA <2011,10,27>
    .FstClus    dw 0007h        ;开始簇号7
    .FileSize   dd LOADERSIZE2

db 14*512-($-RootDir1) dup (0)

;-----------------------------------------------------------------------
;Data Region
;-----------------------------------------------------------------------
LOADER1:
file 'SYSTEM.SYS'               ;33号扇区 ;2347字节占用5个扇区2,3,4,5,6
LOADERSIZE1 = $-LOADER1

LOADER2:
file 'EXAMPLE1.X3D'             ; *号扇区 ;69字节扇区7
LOADERSIZE2 = $-LOADER2

db (2880-1-18-14)*512-($-LOADER1) dup (0)
;-----------------------------------------------------------------------

效果图：

图2:

图3: