Ñòóäåíòàì > Êóðñîâûå > Äðàéâåð æåñòêîãî äèñêà
Äðàéâåð æåñòêîãî äèñêàÑòðàíèöà: 6/6
mov dx, offset initm ; àäpåñ ñîîáùåíèÿ îá
óñòàíîâêå
mov ah, 9 ; âûâîä ñòpîêè
int 21h
mov word ptr es:[di+end_adr], offset diskdrv ; Óñòàíàâëèâàåì
êîíå÷íûé àäðåñ äðàéâåðà
mov ax, cs
mov es:[di+end_adr+2], ax
mov byte ptr es:[di+num_dev], 1 ; ïîääåpæèâàåòñÿ 1 óñòpîéñòâî
mov word ptr es:[di+bpb_adr], offset bpb_ptr ; àäpåñ óêàçàòåëÿ
mov es:[di+bpb_adr+2], ds ; íà BPB
mov bpb_ptr+2, ds ; ñåãìåíòíûé àäpåñ BPB â
óêàçàòåëå íà BPB
xor ax, ax ; âñå îòëè÷íî
ret ; âîçâpàò â âûçûâàþùóþ ïpîãpàììó
init endp
; -----------------------------------------------------------------
dummy proc near ; New generation choose Pepsi
xor ax, ax ; î÷èñòèòü áèò çàíÿòîñòè
ret ; âîçâpàò â âûçûâàþùóþ
ïîäïpîãpàììó
dummy endp
;
-----------------------------------------------------------------
med_test proc near
mov byte ptr es:[di+changed], 1
xor ax, ax ; î÷èñòèòü áèò çàíÿòîñòè
ret ; âîçâpàò â âûçûâàþùóþ
ïîäïpîãpàììó
med_test endp
;
-----------------------------------------------------------------
get_bpb proc near ; ïåpåäàòü DOS àäpåñ BPB
mov word ptr es:[di+bpb_adr], offset bpb
mov word ptr es:[di+bpb_adr+2], ds
xor ax, ax ; î÷èñòèòü áèò çàíÿòîñòè
ret ; âîçâpàò â âûçûâàþùóþ
ïîäïpîãpàììó
get_bpb
endp
;
-----------------------------------------------------------------
no_rem proc near ; íîñèòåëü äèñêà ÿâëÿåòñÿ
íåñìåíÿåìûì
mov ax, 20 ; óñòàíîâèòü áèò çàíÿòîñòè
ret ; âîçâpàò â âûçûâàþùóþ
ïîäïpîãpàììó
no_rem endp
; -----------------------------------------------------------------
write proc near
mov bp, 30h ; ïåpåñûëêà èç DOS â äèñê
jmp short move ; êîïèpîâàòü äàííûå
write endp
read proc
near
mov bp, 20h ; ïåpåñûëêà èç äèñêà â DOS
read endp
move proc
near
mov bx, es:[di+num_rqst] ; êîëè÷åñòâî ïpî÷èòàííûõ
ñåêòîpîâ
fild dword ptr es:[di+sector] ; íîìåp ïåpâîãî ñåêòîpà
fld1
faddp st(1), st(0) ;sect+1
fistp fsec
les di, es:[di+b_adr] ; àäpåñ áóôåpà çàíåñòè â ES:DI
move_1: ;âû÷èñëÿåì ôèç. ñåêòîð
fild fsec ;load
the number of the first sector to st(0)
fild n63 ;load count of the phisycal sectors to st(0)
fxch ;you understand what I mean, that’s right?
Fprem ;st(0) mod st(1)
fxch
fcomp
fistp n ;save number of the phisycal sector
mov al, byte ptr n
mov sect, al
fild fsec ;âû÷èñëÿåì ãîëîâêó
fisub n
fidiv n63
fist temp
fild n255
fxch
fprem
fxch
fcomp
fistp n ;save number of head
mov al, byte ptr n
mov head, al
fild temp ; âû÷èñëÿåì öèëèíäð
fisub n
fidiv n255
fistp n
mov ax, word ptr n
dec ax
mov cyl, ax
h_ok: mov dx, 3f6h ; Turn off IRQ14
xor al, al
out dx, al
call waithd ; sit back and relax…
mov dx, 1f6h ;SDH Register
mov al, 0a0h
out dx, al
mov dx, 1f2h ;Sector count
mov al, 1
out dx, al
mov dx, 1f3h ;Sector number
mov al, sect;1
out dx, al
mov dx, 1f4h ;Cyl. low
mov al, byte ptr cyl;0
out dx, al
mov dx, 1f5h ;Cyl. high
mov al, byte ptr cyl+1;0
out dx, al
mov dx, 1f6h ;SDH register
mov al, head ;1
out dx, al
mov dx, 1f7h ;Status(command) register
mov ax, bp ;20h
out dx, al
mword: mov dx, 1f7h ;wait for data
in al, dx
test al, 8 ; 8th bit=1 - óñòð-âî
çàíÿòî âûï-ì êîìàíäû
jz mword
mov cx, 256
mov dx, 1f0h
mloop: cmp bp, 20h ;Read or Write?
jne wr
in ax, dx
mov es:[di], ax
jmp short nx
wr: mov ax,es:[di]
out dx, ax
nx: add di, 2
loop mloop
call waithd ;æäåì-ñ
mov dx, 3f6h ;Turn on IRQ14
mov al, 2
out dx, al
dec bx
cmp bx, 0 ; êîëè÷åñòâî
ïpî÷èòàííûõ ñåêòîpîâ = 0 ?
je move_e ;if equal, goto end
fild fsec
fld1
faddp st(1), st(0)
fistp fsec
jmp move_1
move_e: xor ax, ax ; âñå îòëè÷íî
mov di, si
ret ; âîçâpàò â âûçûâàþùóþ ïpîãpàììó
move endp
;------------Wait till not busy---------------
waithd: mov dx, 1f7h
in al, dx
test al, 128 ;128=01000000b, it means that device is
ready for R/W
jnz waithd
ret
diskdrv equ $
initm db "Your disk installed and ready to use"
im_ger db "?"
db ": $", 13, 10, 10
;
-----------------------------------------------------------------
code ends
end
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íà òåìó: Ðàçðàáîòêà äðàéâåðà æåñòêîãî äèñêà
Âûïîëíèë: ñò. ãð. ÝÂÌ-1-99
Ûéñàåâ Ó.Á.
Ïðèíÿëà: äîö. Òîêìåðãåíîâà
À.Ç.
Áèøêåê 2003.
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Äàòà ïóáëèêàöèè: 2004-09-01 (514 Ïðî÷òåíî) | 
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