WebSVN – Kolibri OS – Diff – /kernel/trunk/fs/fat32.inc



;;  20.5.2002  Hd status check - VT                                ;;
;;  29.6.2002  Improved fat32 verification - VT                    ;;
;;                                                                 ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

 

$Revision: 649 $

 

    ret

 
 
 
get_free_FAT:
;-----------------------------------------------------------
; output : if CARRY=0 EAX = # first cluster found free
;          if CARRY=1 disk full
; Note   : for more speed need to use fat_cache directly
;-----------------------------------------------------------
    push  ecx
    mov   ecx,[LAST_CLUSTER]    ; counter for full disk
    sub   ecx,2
    mov   eax,[fatStartScan]

    cmp   eax,2
    jb    gff_reset
 
  gff_test:
    cmp   eax,[LAST_CLUSTER]    ; if above last cluster start at cluster 2

    jbe   gff_in_range
  gff_reset:
    mov   eax,2

    pop   ecx                   ; yes. disk is full
    stc
    ret

 
  gff_found:
    lea   ecx,[eax+1]
    mov   [fatStartScan],ecx
    pop   ecx
    clc

 
    cmp   dword [ebx+0x1fc],0xaa550000 ; check sector id

    jne   add_not_fs
 
    add   [ebx+0x1e8],ecx
    mov   eax,[fatStartScan]
    mov   [ebx+0x1ec],eax
    call  hd_write

;    cmp   [hd_error],0

        call    fat_notroot_end_write
        pop     eax
        jmp     fat_notroot_next_sector
fat_notroot_extend_dir:
        push    eax
 
        call    get_free_FAT
        jnc     .found
        pop     eax
        ret     ; CF=1
.found:

        push    ecx
        push    edi
        mov     esi, edx
        test    ecx, ecx
        jz      .done
 
        call    get_free_FAT
        jc      .diskfull
        push    eax
        mov     [edi+26], ax
        shr     eax, 16

.extend_loop:
        cmp     [edi+28], ecx
        jae     .extend_done
; add new cluster
        push    eax
 
        call    get_free_FAT
        jc      .disk_full
        mov     edx, [fatEND]
        call    set_FAT
        mov     edx, eax

Rev 593	Rev 649
Line 42...	Line 42...
42	;; 20.5.2002 Hd status check - VT ;;	42	;; 20.5.2002 Hd status check - VT ;;
43	;; 29.6.2002 Improved fat32 verification - VT ;;	43	;; 29.6.2002 Improved fat32 verification - VT ;;
44	;; ;;	44	;; ;;
45	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;	45	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Line 46...	Line 46...
46		46
Line 47...	Line 47...
47	$Revision: 593 $	47	$Revision: 649 $
Line 48...	Line 48...
48		48
Line 291...	Line 291...
291	ret	291	ret
Line 292...	Line 292...
292		292
293		293
294	get_free_FAT:	-
295	;-----------------------------------------------------------	294	get_free_FAT:
296	; input : EAX = # cluster for start the searching	295	;-----------------------------------------------------------
297	; output : if CARRY=0 EAX = # first cluster found free	296	; output : if CARRY=0 EAX = # first cluster found free
298	; if CARRY=1 disk full	297	; if CARRY=1 disk full
299	; Note : for more speed need to use fat_cache directly	298	; Note : for more speed need to use fat_cache directly
300	;-----------------------------------------------------------	299	;-----------------------------------------------------------
301	push ecx	300	push ecx
-		301	mov ecx,[LAST_CLUSTER] ; counter for full disk
-		302	sub ecx,2
-		303	mov eax,[fatStartScan]
Line 302...	Line 304...
302	mov ecx,[LAST_CLUSTER] ; counter for full disk	304	cmp eax,2
303	sub ecx,2	305	jb gff_reset
304		306
-		307	gff_test:
305	gff_test:	308	cmp eax,[LAST_CLUSTER] ; if above last cluster start at cluster 2
Line 306...	Line 309...
306	cmp eax,[LAST_CLUSTER] ; if above last cluster start at cluster 2	309	jbe gff_in_range
307	jbe gff_in_range	310	gff_reset:
308	mov eax,2	311	mov eax,2
Line 326...	Line 329...
326	pop ecx ; yes. disk is full	329	pop ecx ; yes. disk is full
327	stc	330	stc
328	ret	331	ret
Line 329...	Line 332...
329		332
-		333	gff_found:
-		334	lea ecx,[eax+1]
330	gff_found:	335	mov [fatStartScan],ecx
331	pop ecx	336	pop ecx
332	clc	337	clc
Line 669...	Line 674...
669		674
670	cmp dword [ebx+0x1fc],0xaa550000 ; check sector id	675	cmp dword [ebx+0x1fc],0xaa550000 ; check sector id
Line 671...	Line 676...
671	jne add_not_fs	676	jne add_not_fs
-		677
-		678	add [ebx+0x1e8],ecx
672		679	mov eax,[fatStartScan]
673	add [ebx+0x1e8],ecx	680	mov [ebx+0x1ec],eax
674	call hd_write	681	call hd_write
Line 675...	Line 682...
675	; cmp [hd_error],0	682	; cmp [hd_error],0
Line 1476...	Line 1483...
1476	call fat_notroot_end_write	1483	call fat_notroot_end_write
1477	pop eax	1484	pop eax
1478	jmp fat_notroot_next_sector	1485	jmp fat_notroot_next_sector
1479	fat_notroot_extend_dir:	1486	fat_notroot_extend_dir:
1480	push eax	1487	push eax
1481	mov eax, [eax]	-
1482	call get_free_FAT	1488	call get_free_FAT
1483	jnc .found	1489	jnc .found
1484	pop eax	1490	pop eax
1485	ret ; CF=1	1491	ret ; CF=1
1486	.found:	1492	.found:
Line 1939...	Line 1945...
1939	push ecx	1945	push ecx
1940	push edi	1946	push edi
1941	mov esi, edx	1947	mov esi, edx
1942	test ecx, ecx	1948	test ecx, ecx
1943	jz .done	1949	jz .done
1944	mov eax, 2	-
1945	call get_free_FAT	1950	call get_free_FAT
1946	jc .diskfull	1951	jc .diskfull
1947	push eax	1952	push eax
1948	mov [edi+26], ax	1953	mov [edi+26], ax
1949	shr eax, 16	1954	shr eax, 16
Line 2390...	Line 2395...
2390	.extend_loop:	2395	.extend_loop:
2391	cmp [edi+28], ecx	2396	cmp [edi+28], ecx
2392	jae .extend_done	2397	jae .extend_done
2393	; add new cluster	2398	; add new cluster
2394	push eax	2399	push eax
2395	mov eax, edx	-
2396	call get_free_FAT	2400	call get_free_FAT
2397	jc .disk_full	2401	jc .disk_full
2398	mov edx, [fatEND]	2402	mov edx, [fatEND]
2399	call set_FAT	2403	call set_FAT
2400	mov edx, eax	2404	mov edx, eax

Subversion Repositories Kolibri OS

(root)/kernel/trunk/fs/fat32.inc @ 1378 – Rev 593 → 649