boot_hw.s~

简单的操作系统源代码

.code16
.text
   jmp LABEL_START
   nop
BS_OEMNAME:      .ascii "Kongxw  "
BPB_BytsPerSec:  .2byte  512
BPB_SecPerCluster: .byte 1
BPB_ResvdSecCnt:  .2byte 1
BPB_NumFATS:     .byte   2
BPB_RootEntCnt:  .2byte  224
BPB_TotSec16:    .2byte  2880
BPB_Media:       .byte   0xf0
BPB_FATSz16:     .2byte  9
BPB_SecPerTrk:   .2byte  18
BPB_NumHeads:    .2byte  2
BPB_HiddSec :    .4byte  0
BPB_TotSec32:    .4byte  0
BS_DrvNum:       .byte   0
BS_Reserved1:    .byte   0
BS_BootSig:      .byte   0x29
BS_VolID:        .4byte  0
BS_VolLab:       .ascii "Kongxw-flpa"
BS_FileSysType:  .ascii "FAT12   "
LABEL_START:
   mov %cs,%ax
   mov %ax,%ds
   mov %ax,%es
   call DispStr
   jmp .
DispStr:
    mov     $0x0600,%ax   /* %ah=6, %al=0 */
    mov     $0x0700,%bx   /* Black white */
    mov     $0,%cx        /* Top left: (0,0) */
    mov     $0x184f,%dx   /* Bottom right: (80,50) */
    int     $0x10 
   mov $BootMessage, %ax
   mov %ax,%bp
   mov $24,%cx
   mov $0x1301,%ax
   mov $0x00c, %bx
   mov $0,%dl
   int $0x10
   ret
BootMessage: .ascii "Hello,Kongxw's OS world!"
   .org 510
   .word 0xaa55