WebSVN – Kolibri OS – Blame – /kernel/trunk/fs/fat12.inc

Rev	Author	Line No.	Line
2288	clevermous	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
2455	mario79	3	;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;
2288	clevermous	4	;; Distributed under terms of the GNU General Public License ;;
		5	;; ;;
		6	;; FAT12.INC ;;
		7	;; (C) 2005 Mario79, License: GPL ;;
		8	;; ;;
		9	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		10
		11	$Revision: 2455 $
		12
		13
		14	n_sector dd 0 ; temporary save for sector value
		15	flp_status dd 0
		16	clust_tmp_flp dd 0 ; used by analyze_directory and analyze_directory_to_write
		17	path_pointer_flp dd 0
		18	pointer_file_name_flp dd 0
		19	save_root_flag db 0
		20	save_flag db 0
		21	root_read db 0 ; 0-necessary to load root, 1-not to load root
		22	flp_fat db 0 ; 0-necessary to load fat, 1-not to load fat
		23	flp_number db 0 ; 1- Floppy A, 2-Floppy B
		24	old_track db 0 ; old value track
		25	flp_label rb 15 ; Label and ID of inserted floppy disk
		26
		27	reserve_flp:
		28
		29	cli
		30	cmp [flp_status], 0
		31	je reserve_flp_ok
		32
		33	sti
		34	call change_task
		35	jmp reserve_flp
		36
		37	reserve_flp_ok:
		38
		39	push eax
		40	mov eax, [CURRENT_TASK]
		41	shl eax, 5
		42	mov eax, [eax+CURRENT_TASK+TASKDATA.pid]
		43	mov [flp_status], eax
		44	pop eax
		45	sti
		46	ret
		47
		48
		49	floppy_fileread:
		50	;----------------------------------------------------------------
		51	;
		52	; fileread - sys floppy
		53	;
		54	; eax points to filename 11 chars - for root directory
		55	; ebx first wanted block ; 1+ ; if 0 then set to 1
		56	; ecx number of blocks to read ; 1+ ; if 0 then set to 1
		57	; edx mem location to return data
		58	; esi length of filename 12*X
		59	; edi pointer to path /fd/1/...... - for all files in nested directories
		60	;
		61	; ret ebx = size or 0xffffffff file not found
		62	; eax = 0 ok read or other = errormsg
		63	; 10 = access denied
		64	;--------------------------------------------------------------
		65
		66	mov [save_flag], 0
		67	mov [path_pointer_flp], edi
		68	test esi, esi ; return ramdisk root
		69	jnz fr_noroot_1
		70	cmp ebx, 224/16
		71	jbe fr_do_1
		72	mov eax, 5
		73	xor ebx, ebx
		74	mov [flp_status], ebx
		75	ret
		76
		77	fr_do_1:
		78	push ebx ecx edx
		79	call read_flp_root
		80	pop edx ecx ebx
		81	cmp [FDC_Status], 0
		82	jne fdc_status_error_1
		83	mov edi, edx
		84	dec ebx
		85	shl ebx, 9
		86	mov esi, FLOPPY_BUFF
		87	add esi, ebx
		88	shl ecx, 9
		89	cld
		90	rep movsb
		91	xor eax, eax
		92	xor ebx, ebx
		93	; mov eax,0 ; ok read
		94	; mov ebx,0
		95	mov [flp_status], eax
		96	ret
		97	fdc_status_error_1:
		98	xor eax, eax
		99	mov [flp_status], eax
		100	mov eax, 10
		101	or ebx, -1
		102	ret
		103
		104	fr_noroot_1:
		105	sub esp, 32
		106	call expand_filename
		107	frfloppy_1:
		108	test ebx, ebx
		109	jnz frfl5_1
		110	mov ebx, 1
		111	frfl5_1:
		112	test ecx, ecx
		113	jnz frfl6_1
		114	mov ecx, 1
		115	frfl6_1:
		116	dec ebx
		117	push eax
		118	push eax ebx ecx edx esi edi
		119	call read_flp_fat
		120	cmp [FDC_Status], 0
		121	jne fdc_status_error_3_1
		122	mov [FDD_Track], 0; ��
		123	mov [FDD_Head], 1; ��
		124	mov [FDD_Sector], 2; ��
		125	call SeekTrack
		126	mov dh, 14
		127	l.20_1:
		128	call ReadSectWithRetr
		129	cmp [FDC_Status], 0
		130	jne fdc_status_error_3_1
		131	mov dl, 16
		132	mov edi, FDD_BUFF
		133	inc [FDD_Sector]
		134	l.21_1:
		135	mov esi, eax ;Name of file we want
		136	mov ecx, 11
		137	cld
		138	rep cmpsb ;Found the file?
		139	je fifound_1 ;Yes
		140	add ecx, 21
		141	add edi, ecx ;Advance to next entry
		142	dec dl
		143	test dl, dl
		144	jnz l.21_1
		145	dec dh
		146	test dh, dh
		147	jnz l.20_1
		148	fdc_status_error_3:
		149	mov eax, 5 ; file not found ?
		150	or ebx, -1
		151	add esp, 32+28
		152	mov [flp_status], 0
		153	ret
		154	fdc_status_error_3_2:
		155	cmp [FDC_Status], 0
		156	je fdc_status_error_3
		157	fdc_status_error_3_1:
		158	add esp, 32+28
		159	jmp fdc_status_error_1
		160
		161	fifound_1:
		162	mov eax, [path_pointer_flp]
		163	cmp [eax+36], byte 0
		164	je fifound_2
		165	add edi, 0xf
		166	mov eax, [edi]
		167	and eax, 65535
		168	mov ebx, [path_pointer_flp]
		169	add ebx, 36
		170	call get_cluster_of_a_path_flp
		171	jc fdc_status_error_3_2
		172	mov ebx, [ebx-11+28] ;file size
		173	mov [esp+20], ebx
		174	mov [esp+24], ebx
		175	jmp fifound_3
		176	fifound_2:
		177	mov ebx, [edi-11+28] ;file size
		178	mov [esp+20], ebx
		179	mov [esp+24], ebx
		180	add edi, 0xf
		181	mov eax, [edi]
		182	fifound_3:
		183	and eax, 65535
		184	mov [n_sector], eax ;eax=cluster
		185	frnew_1:
		186	add eax, 31 ;bootsector+2*fat+filenames
		187	cmp [esp+16], dword 0; wanted cluster ?
		188	jne frfl7_1
		189	call read_chs_sector
		190	cmp [FDC_Status], 0
		191	jne fdc_status_error_5
		192	mov edi, [esp+8]
		193	call give_back_application_data_1
		194	add [esp+8], dword 512
		195	dec dword [esp+12] ; last wanted cluster ?
		196	cmp [esp+12], dword 0
		197	je frnoread_1
		198	jmp frfl8_1
		199	frfl7_1:
		200	dec dword [esp+16]
		201	frfl8_1:
		202	mov edi, [n_sector]
		203	shl edi, 1 ;find next cluster from FAT
		204	add edi, FLOPPY_FAT
		205	mov eax, [edi]
		206	and eax, 4095
		207	mov edi, eax
		208	mov [n_sector], edi
		209	cmp edi, 4095 ;eof - cluster
		210	jz frnoread2_1
		211	cmp [esp+24], dword 512;eof - size
		212	jb frnoread_1
		213	sub [esp+24], dword 512
		214	jmp frnew_1
		215
		216	read_chs_sector:
		217	call calculate_chs
		218	call ReadSectWithRetr
		219	ret
		220
		221	frnoread2_1:
		222	cmp [esp+16], dword 0; eof without read ?
		223	je frnoread_1
		224	mov [fdc_irq_func], fdc_null
		225	pop edi esi edx ecx
		226	add esp, 4
		227	pop ebx; ebx <- eax : size of file
		228	add esp, 36
		229	mov eax, 6; end of file
		230	mov [flp_status], 0
		231	ret
		232
		233	frnoread_1:
		234	pop edi esi edx ecx
		235	add esp, 4
		236	pop ebx; ebx <- eax : size of file
		237	add esp, 36
		238	xor eax, eax
		239	mov [flp_status], eax
		240	ret
		241
		242	fdc_status_error_5:
		243	pop edi esi edx ecx
		244	add esp, 4
		245	pop ebx; ebx <- eax : size of file
		246	add esp, 36
		247	jmp fdc_status_error_1
		248
		249	read_flp_root:
		250	pusha
		251	call check_label
		252	cmp [FDC_Status], 0
		253	jne unnecessary_root_read
		254	cmp [root_read], 1
		255	je unnecessary_root_read
		256	mov [FDD_Track], 0; ��
		257	mov [FDD_Head], 1; ��
		258	mov [FDD_Sector], 2; ��
		259	mov edi, FLOPPY_BUFF
		260	call SeekTrack
		261	read_flp_root_1:
		262	call ReadSectWithRetr
		263	cmp [FDC_Status], 0
		264	jne unnecessary_root_read
		265	push edi
		266	call give_back_application_data_1
		267	pop edi
		268	add edi, 512

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(root)/kernel/trunk/fs/fat12.inc @ 3598 – Rev 2455