编辑工具： EditPlug 3.01
光盘镜像工具 ： UltraISO 9.2.0
编译工具：nasm 0.98.38
调试工具：Bochs-2.3.7
BootSect.asm 文件
bits 16
org 0x0000
;org 0x0100
%define BOOT_STARTRUN_ADDR 0x7c0
%define BCB_TO_ASCII(x) add x , 0x30
%define TIME_POSITION_ROW 0x9
%define TIME_POSITION_COLUMN 0x9
%define SYSTE_START 0x1000
start:
cli
mov ax , BOOT_STARTRUN_ADDR
mov es , ax
mov ds , ax
mov ss , ax
call Print_Menu
call ReadKey ;;读区键盘缓冲区的字符 并写到 [var_tmp] 中
cmp byte [var_tmp] , 0x31
je ResetPC
cmp byte [var_tmp] , 0x32
je LoadSystem
cmp byte [var_tmp] , 0x33
je Time
cmp byte [var_tmp] , 0x34
je SetTime
jmp bootend
ReadKey:
.s:
mov ah , 0
int 0x16
cmp al , 0xd ;按回车键
je .ReadKey_end
cmp al , 0x30 ;只能输入大于 0x30的数字
jbe .s
cmp al , 0x35 ;只能输入小于于0x34的数字
jae .s
mov byte [var_tmp] ,al
call Get_Pos
mov cx , 1
mov ah , 0xa
mov al , byte [var_tmp]
int 0x10
jmp .s
.ReadKey_end
ret
LoadSystem:
mov byte [DiskAddressPacket.PackSize] , 0x10
mov byte [DiskAddressPacket.Reserved] , 0x0
mov word [DiskAddressPacket.BlockCount] , 0x1
mov dword [DiskAddressPacket.BufferAddr] , BOOT_STARTRUN_ADDR*16+SYSTE_START ; Buffer's LBA
mov dword [DiskAddressPacket.BlockNum], 0x0
mov dword [DiskAddressPacket.BlockNum+4], 0x0
mov ah , 0x42
mov dl , 0x80
mov si , DiskAddressPacket
; mov ah , 0x41
; mov bx , 0x55AA
; mov dl , 0x80
int 0x13 ;
这里调用扩展int13 42号功能读取光盘数据 我怎弄都不不行. 这个运行之后 ax=0x420d ????? 根据扩展 int13说明 ah =错误代码? 可是我怎么找都早不到42号错误代码是什么? jb error_input
jmp SYSTE_START
jmp bootend
ResetPC: ;;从新启动电脑
jmp word 0xffff:0000
SetTime: ;;设置时间
call Time
jmp bootend
Time: ;;打印时间
call Get_Pos
s:
mov bx , var_time
mov ah , 9
call ReadTime
mov ah , 8
call ReadTime
mov ah , 7
call ReadTime
mov ah , 4
call ReadTime
mov ah , 2
call ReadTime
mov ah , 0
call ReadTime
call print_time
jmp s
ret
error_input:
call Get_Pos
mov cx , time_str-error
mov bx , 0x0007
mov bp , error
mov ax , 0x1301
int 0x010 ;;Print out the loading message. 利用10中断在屏幕输出字符
jmp bootend
print_time
mov ax , word [var_time.Year]
mov word [time_str+2] ,ax
mov ax , word [var_time.Month]
mov word [month] ,ax
mov ax , word [var_time.Day]
mov word [day] ,ax
mov ax , word [var_time.Hour]
mov word [hour] ,ax
mov ax , word [var_time.Minitue]
mov word [minitue] ,ax
mov ax , word [var_time.Second]
mov word [Second] ,ax
mov al , 1
mov bh , 0
mov bx , 0x0007
mov bp , time_str
mov cx , end_Print_message - time_str
mov ah , 0x13
int 0x010
ret
bootend: ;;程序结束空循环
; mov cx,0x0001
; loop bootend
jmp $
Print_Menu:
call Get_Pos
mov cx , error -System_menu
mov bx , 0x0007
mov bp , System_menu
mov ax , 0x1301
int 0x010 ;;Print out the loading message. 利用10中断在屏幕输出字符
ret ;;End of the procedure.
Get_Pos:
mov ah , 0x3
mov bh , 0x0
int 0x10
ret
ReadTime
mov al ,ah
out 70h ,al
in al , 71h
mov ah , al
mov cl , 4
shr ah , cl
and al , 00001111b
BCB_TO_ASCII (ah)
BCB_TO_ASCII (al)
mov byte [bx] ,ah
mov byte [bx+1] ,al
add bx , 2
ret
Print_message:
System_menu
db 0x0d ;;0x0d =13 回车
db 0x0a ;;换行
db '1) Reset PC'
db 0x0d
db 0x0a
db '2)Load system'
db 0x0d
db 0x0a
db '3) Clock'
db 0x0d
db 0x0a
db '4) Set clock'
db 0x0d
db 0x0a
db 'SelectItem : '
error db 0x0d
db 0x0a
db 'Boot Error'
db 0x0d
db 0x0a
time_str db 0x0d
db 0x0a
db 0,0,
db '-'
month db 0,0
db '-'
day db 0,0
db ' '
hour db 0,0
db ':'
minitue db 0,0
db ':'
Second db 0,0
end_Print_message
var_tmp db 0x0
var_time
.Year db 0,0
.Month db 0,0
.Day db 0,0
.Hour db 0,0
.Minitue db 0,0
.Second db 0,0
endvar_time
DiskAddressPacket
.PackSize db 0
.Reserved db 0
.BlockCount db 0,0
.BufferAddr db 0,0,0,0
.BlockNum db 0,0,0,0,0,0,0,0
endDiskAddressPacket
end_boot
times 510 - ($ - $$) db 0x00
dw 0xaa55
;=====================================================================
以下是int 13 42号功能的说明
IBM/MS INT 13 Extensions - EXTENDED READ
AH = 42h
DL = drive number
DS:SI -> disk address packet (see #0249)
Return:
CF clear if successful
AH = 00h
CF set on error
AH = error code (see #0211)
disk address packet's block count field set to number of blocks
successfully transferred
See Also:AH=02h - AH=41h"INT 13 Ext" - AH=43h"INT 13 Ext"
Format of disk address packet:
Offset Size Description (Table 0249)
00h BYTE 10h (size of packet)
01h BYTE reserved (0)
02h WORD number of blocks to transfer (max 007Fh for Phoenix EDD)
04h DWORD -> transfer buffer
08h QWORD starting absolute block number
(for non-LBA devices, compute as
(Cylinder*NumHeads + SelectedHead) * SectorPerTrack +
SelectedSector - 1
制作iso光盘镜像文件
利用UltraISO工具建立光盘让后在菜单里选 启动光盘－＞加载引导文件
选择上面编译过生成的 bootSect.bin的二进制文件．生成 Boot.iso
最后在 bochs 的demo的配置文件修改
原来:
ata0-master: type=disk, path="hd10meg.img", cylinders=306, heads=4, spt=17
修改成
ata0-master: type=cdrom, path="D:\boot\Bin\boot.iso", status=inserted
启动 bochs开始调试.....................
哪个高手能帮我解决掉这个问题!!!!!!!!