程序功能：將特定功能的指令寫到軟盤第一扇區，開機cpu執行軟盤裏面的指令
實現
1:啓動硬盤系統、硬盤第一扇區
2:重啓計算機、
3:顯示系統時間、
4:修改系統時間。
要是想要實現裸機加載運行的話，得使用U盤啓動工具，另外寫一個程序將下面的代碼寫到U盤的引導位置
assume cs:code
code segment
get_input:
push bx
push es
push ax
mov ax,0b800h
mov es,ax
gi_s:
mov ah,4
call my_boot
mov ah,0
int 16h
cmp ah,3bh ;-input is f1
jne next0
call change_color
next0:
cmp ah,02H ;--input is 1
jne next1
mov ah,0
call my_boot
jmp gi_s
next1:
cmp ah,03H ;--input is 2
jne next2
mov ah,1
call my_boot
jmp gi_s
next2:
cmp ah,04H ;--input is 3
jne next3
mov ah,2
call my_boot
jmp gi_s
next3:
cmp ah,05H ;--input is 4
jne next4
mov ah,3
call my_boot
jmp gi_s
next4:
jmp gi_s
pop es
pop bx
pop ax
ret
;--------------------------------
my_boot:
jmp short mb_s
table dw reset_pc,star_system,clock,set_clock,show_menu
mb_s:
push ax
push bx
push cx
cmp ah,4
ja ss_end0
mov bl,ah
mov bh,0
add bx,bx
call clear_screen
jmp word ptr table[bx]
;;--------------------------顯示menu
show_menu:
jmp short sm_start
m1:db "1.reset pc",0
m2:db "2.star_system",0
m3:db "3.show clock",0
m4:db "4.set clock",0
sm_start:
mov bx,160*5+64
mov di,0
mov si,offset m1
mov cx,4
sm1: push cx
sm2:
mov cl,cs:[si]
jcxz sm_ok1
mov byte ptr es:[bx+di],cl
inc si
add di,2
jmp sm2
sm_ok1:
inc si
mov di,0
add bx,160*3
pop cx
loop sm1
jmp mb_end
;--------------------------------
reset_pc: ;---------------------重啓電腦
mov ax,0ffffh
push ax
mov ax,0
push ax
retf
ss_end0: jmp mb_end
;--------------------------------
star_system: ;---------------------引導現有操作系統
mov ax,0
mov es,ax
mov bx,7c00h
mov al,1
mov ch,0
mov cl,1
mov dh,0
mov dl,80h
mov ah,2
int 13h
mov ax,0
push ax
mov ax,7c00h
push ax
retf
;-------------------------------
clock: ;---------------------進入時鐘程序
sc1:
in al,60h
cmp al,1
je c_end
cmp al,3bh ;-input is f1
jne next_c
call change_color
next_c:
call show_peice
jmp sc1
c_end:
jmp mb_end
;--------------------------------
set_clock: ;---------------------設置時間
jmp short set_start
now_pos db 0,1,15,2,3,15,4,5,15,6,7,15,8,9,15,10,11
port_pos db 9,9,8,8,7,7,4,4,2,2,0,0
set_start:
mov dx,0
or byte ptr es:[160*12+32*2+1],40h
ss1:
in al,60h
cmp al,1
je mb_end
cmp al,3bh ;-input is f1
jne next_sc
call change_color
next_sc:
call myfunc
call show_peice
jmp ss1
mb_end:
mov ax,40h
mov ds,ax
back0:
mov ax,ds:[1ch]
cmp ds:[1ah],ax
je back1
mov ah,0
int 16h
jmp back0
back1:
pop cx
pop bx
pop ax
ret
;-----------------------左4B 右4D
myfunc:
push si
push cx
push ax
push bx
;in al,60h
;cmp al,1
;jne nst1
nst1:
cmp al,11
ja mov_zy
jmp change_time
mov_zy:
cmp al,4Dh ;----right
jne nst2
mov bx,dx
cmp bx,16
je nst2
add bx,bx
and byte ptr es:[bx+1+160*12+32*2],0fh
add dx,1
or byte ptr es:[bx+3+160*12+32*2],40h
nst2:
cmp al,4bh ;----left
jne nst3
mov bx,dx
cmp bx,0
je nst3
add bx,bx
and byte ptr es:[bx+1+160*12+32*2],0fh
sub dx,1
or byte ptr es:[bx-1+160*12+32*2],40h
nst3:
jmp st_out
change_time:
cmp al,11
jne alnot_0
mov al,1
alnot_0:
sub al,1
mov bx,dx
mov si,bx
add si,si
cmp byte ptr es:[si+160*12+32*2],39h
ja st_out
cmp byte ptr es:[si+160*12+32*2],30h
jb st_out
mov ch,al
cmp byte ptr now_pos[bx+1],15
je in_low ;--if next now_pos is 15,is changing low_pos
mov ah,es:[si+160*12+32*2+2]
and ah,0Fh
mov cl,4
shl ch,cl
jmp s_deal
in_low:
mov ah,es:[si+160*12+32*2-2]
mov cl,4
shl ah,cl
s_deal:
or ah,ch
mov bl, now_pos[bx]
mov al, port_pos[bx]
out 70h,al
mov al,ah
out 71h,al
st_out:
mov al,0d2h
out 64h,al
out 60h,al
pop bx
pop ax
pop cx
pop si
ret
;--------------------------------
show_peice: ;------------------show current time
push cx
push ax
jmp short sc_start
clock_p db 9,8,7,4,2,0
clock_t db ' / / : : '
sc_start:
mov byte ptr es:[160*12+31*2],'0'
mov byte ptr es:[160*12+30*2],'2'
mov di,0
mov si,0
mov cx,6
sc2: push cx
mov al,clock_p[si]
out 70h,al
in al,71h
mov ah,al
mov cl,4
shr ah,cl
and al,0fh
add ah,30h
add al,30h
mov byte ptr clock_t[di],ah
mov byte ptr clock_t[di+1],al
add di,3
inc si
pop cx
loop sc2
mov di,0
mov si,160*12+32*2
mov ah,10
mov cx,17
sc3:
mov al,clock_t[di]
mov byte ptr es:[si],al
inc di
add si,2
loop sc3
pop ax
pop cx
ret
;--------------------------------
clear_screen: ;--清屏
push cx
push bx
mov bx,0
mov cx,2000
clear_s1:
mov byte ptr es:[bx],' '
and byte ptr es:[bx+1],0fh
add bx,2
loop clear_s1
pop bx
pop cx
ret
change_color:
push cx
push bx
mov bx,0
mov cx,2000
cc1:
inc byte ptr es:[bx+1]
and byte ptr es:[bx+1],0fh
add bx,2
loop cc1
pop bx
pop cx
ret
all_end:nop
start:
push cs ;copy a function to section 1
pop es
mov bx,offset copy_start
mov al,1
mov ch,0
mov cl,1
mov dh,0
mov dl,0
mov ah,3
int 13h
;call get_input ;------------do not use
mov bx,0
mov al,2
mov ch,0
mov cl,2
mov dh,0
mov dl,0
mov ah,3
int 13h
p_end: mov ax,4c00h
int 21h
copy_start:
mov ax,7c00h
mov es,ax
mov bx, 0
mov al,2
mov ch,0
mov cl,2
mov dh,0
mov dl,0
mov ah,2
int 13h
mov ax,7c00h
push ax
mov ax,0
push ax
retf
copy_end:nop
;----------------------開始引導
code ends
end start