纯DOS下无需加载MSCDEX，直接弹出或关闭CD-ROM舱
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;===================================================
;
; Program: Detect ATAPI device exist or not
; If exist, change status.
; If now exist, do nothing.
; Not affect ATA device.
; Environment: Pure DOS.
; Author: Jim Yu (Yu Ling)
; Data: 2004.07.15
; Version: 1.0.0
; Mail: Jim.Yu@Mic.Com.Tw
;
.MODEL SMALL
.586P
.STACK 1024
.DATA
BSY EQU 80h
DRQ EQU 8
START_STOP_UNIT EQU 1Bh
EJECT_TRAY EQU 2
CLOSE_TRAY EQU 3
MODE_SENCE EQU 5Ah
STATUS_PAGE EQU 2Ah
SIZE_OF_CHANNEL_ITEM EQU 15h
SHOW_DOOR_OPEN DB 'Door Opened.',0dh, 0ah, '$'
SHOW_DOOR_CLOSE DB 'Door Closed.',0dh, 0ah, '$'
NOT_EXIST DB 'Not Exist.',0dh, 0ah, '$'
SS_CHANNEL DB '4.Secondary Slave $'
SM_CHANNEL DB '3.Secondary Master $'
PS_CHANNEL DB '2.Primany Slave $'
PM_CHANNEL DB '1.Primany Master $'
PACKET_COMMAND DB 12 DUP(0)
.CODE
START:
MOV AX, @code
MOV DS, AX
PUSH DS
;Code start
push seg PACKET_COMMAND
pop ds
mov cx, 4
next_device:
call show_channel
call detect_atapi
jne not_atapi
call detect_device
jc @f
call open_device
call open_device Some ATAPI (e.g. DVD-ROM)
call open_device Need send command 3 times.
mov dx, offset SHOW_DOOR_OPEN
jmp show_and_reset_device
@@:
call close_device
call close_device Some ATAPI (e.g. DVD-ROM)
call close_device Need send command 3 times.
mov dx, offset SHOW_DOOR_CLOSE
show_and_reset_device:
mov ah, 9
int 21h
call reset_device
jmp check_device_finish
not_atapi:
mov dx, offset NOT_EXIST
mov ah, 9
int 21h
check_device_finish:
loop next_device
;Code end
POP DS
MOV AX, 4C00h
INT 21h
;===================================================
; procedure: show_channel
; in: cx
; out: none
; destroy:none
show_channel proc
push cx
push seg SS_CHANNEL
pop ds
mov dl, cl
dec dl
mov ax, SIZE_OF_CHANNEL_ITEM
mul dl
mov dx, ax
add dx, offset SS_CHANNEL
mov ah, 9
int 21h
pop cx
ret
show_channel endp
;===================================================
; procedure: waid_idle
; in: dx
; out: CY = time out
; NC = device idle
; destroy:none
wait_idle proc
push cx
push dx
push ax
or dl, 7
mov cx, 0ffffh
@@:
call in_al_dx
test al, BSY
jz @f
loop @b
@@:
pop ax
pop dx
pop cx
ret
wait_idle endp
;===================================================
; procedure: req_data
; in: dx
; out: CY = time out
; NC = device request data
; destroy:none
req_data proc
push cx
push dx
push ax
or dl, 7
mov cx, 0ffffh
@@:
call in_al_dx
test al, DRQ
jnz @f
loop @b
@@:
pop ax
pop dx
pop cx
ret
req_data endp
;===================================================
; procedure: set_feature
; in: ax
; out: none
; destroy:ax
; Set 1X1 = 0
; Set 1X4 = AL
; Set 1X5 = AH
; Send 1X7 0A0h
set_feature proc
push dx
push ax
inc dl
xor al, al
call out_dx_al
pop ax
add dl, 3
call out_dx_al
inc dl
xchg ah, al
call out_dx_al
add dl, 2
mov al, 0a0h
call out_dx_al
pop dx
ret
set_feature endp
;===================================================
; procedure: send_packet_command
; in: dx, si
; out: none
; destroy:ax, si
send_packet_command proc
push cx
mov cx, 6
@@:
mov ax, ds:[si]
call out_dx_ax
xor ax, ax
mov ds:[si], ax
add si, 2
loop @b
call wait_idle
pop cx
ret
send_packet_command endp
;===================================================
; procedure: detect_device
; in: cx
; out: CY = Tray Open
; NC = Tray Close
; destroy:dx, ax, si
; Detect atapi device tray
detect_device proc
call set_device
mov ax, 090h
call set_feature
call wait_idle
@@:
mov si, offset PACKET_COMMAND
mov ax, (STATUS_PAGE * 100h) + MODE_SENCE
mov ds:[si], al
mov ds:[si+2], ah
mov al, 90h
mov ds:[si+8], al
call send_packet_command
call req_data
call in_al_dx
call in_al_dx
cmp al, 70h
je door_close
stc
ret
door_close:
clc
ret
detect_device endp
;===================================================
; procedure: reset_device
; in: cx
; out: none
; none
; destroy:dx, ax, si
; Open atapi device tray
reset_device proc
call set_device
mov ax, 0ffffh
call set_feature
call wait_idle
call req_data
mov si, offset PACKET_COMMAND
xor ax, ax
call send_packet_command
ret
reset_device endp
;=====================================================
; procedure: open_device
; in: cx
; out: none
; none
; destroy:dx, ax, si
; Open atapi device tray
open_device proc
call set_device
mov ax, 0fffeh
call set_feature
call wait_idle
call req_data
mov si, offset PACKET_COMMAND
mov ax, (EJECT_TRAY * 100h) + START_STOP_UNIT
mov ds:[si], al
mov ds:[si+4], ah
call send_packet_command
ret
open_device endp
;===================================================
; procedure: close_device
; in: cx
; out: none
; none
; destroy:dx, ax, si
; Close atapi device tray
close_device proc
call set_device
xor ax, ax
call set_feature
call wait_idle
call req_data
mov si, offset PACKET_COMMAND
mov ax, (CLOSE_TRAY * 100h) + START_STOP_UNIT
mov ds:[si], al
mov ds:[si+4], ah
call send_packet_command
ret
close_device endp
;===================================================
; procedure: detect_atapi
; in: cx
; out: PO = not atapi device
; PE = is atapi device
; destroy:none
detect_atapi proc
push cx
call set_device
call wait_idle
add dl, 7
mov al, 0ech
call out_dx_al
call wait_idle
sub dx, 3
call in_al_dx
xchg ah, al
inc dx
call in_al_dx
cmp ax, 014ebh
pop cx
ret
detect_atapi endp
;===================================================
; procedure: set_device
; in: cx
; out: none
;
; destroy:dx, ax
;
; Out 1X6 = 0A0h or 0B0h
; Set DX = 1X0
; Set AL = 0A0h or 0B0h
set_device proc
mov dx, cx
cmp dx, 2
mov dx, 1f6h
ja @f
mov dx, 176h
@@:
mov ax, cx
and al, 1
shl al, 4
or al, 0a0h
call out_dx_al
and dl, 0F0h
ret
set_device endp
in_al_dx proc
in al, dx
out 0edh, al
ret
in_al_dx endp
in_ax_dx proc
in ax, dx
out 0edh, al
ret
in_ax_dx endp
out_dx_al proc
out dx, al
out 0edh, al
ret
out_dx_al endp
out_dx_ax proc
&