[avrcpm.git] / avrcpm / avr / dsk_mgr.asm

;    Various Management functions for the Interaction with the File-
;    systems
;
;    Copyright (C) 2010 Frank Zoll
;
;    This file is part of avrcpm.
;
;    avrcpm is free software: you can redistribute it and/or modify it
;    under the terms of the GNU General Public License as published by
;    the Free Software Foundation, either version 3 of the License, or
;    (at your option) any later version.
;
;    avrcpm is distributed in the hope that it will be useful,
;    but WITHOUT ANY WARRANTY; without even the implied warranty of
;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;    GNU General Public License for more details.
;
;    You should have received a copy of the GNU General Public License
;    along with avrcpm.  If not, see <http://www.gnu.org/licenses/>.
;
;    $Id$
;


; -------------------------- Defines for the disk management Structures

; Partition Table Structures

#define PART_TYPE   4
#define PART_START  8
#define PART_SIZE  12

/*
 *  Partition table id 
 *	(see http://www.win.tue.nl/~aeb/partitions/partition_types-1.html)
 */	
#define PARTID1_FAT16 0x0E
#define PARTID2_FAT16 0x06
#define PARTID_CPM    0x52


; ------------------------------------------------ Start of Code Segment
	.cseg

; ====================================================================
; Function: Scans a Disk for CP/M Partions
; ====================================================================
; Parameters
; --------------------------------------------------------------------
; 
; Registers  : [w] temp	    Number of disk images (raw and fat16) found.
;			    + 0x80 if sd card changes. (not used, doesn't work)
; SREG	:	   Z 	    according to temp
; --------------------------------------------------------------------
; Description:
; This Function scans an SD-Cards Boot-Sector for valid Partitions.
; First all original CP/M Partitions will be usesed as Drives for
; the CPM-System. Wenn all CP/M Partitions are found, a second
; scann will be made. In the second Scan, the first FAT16 Partition
; on the Disk will be used for a detailed analyses. If there
; are any Files like "cpm_x.img" are found, these Files will be
; used as Disks by the CP/M- System. ( x must be in the Range A to D )
; ====================================================================	
mgr_init_partitions:

	sts	ndisks,_0		; Set Number of Disks to 0

; Initialize partition table
	ldiw	y,hostparttbl
	ldi	temp2,PARTENTRY_SIZE*MAXDISKS
mgr_picl:
	st	y+,_0
	dec	temp2
	brne	mgr_picl

; Start mmc Card interaction
	lcall	mmcInit
	andi	temp,MMCST_NOINIT & MMCST_NODISK
	brne	mgr_pierr
	
;Load first sector from MMC (boot sector)
	ldiw	y,0			; Sector 0
	movw	x,y
	lcall	mmcReadSect
	tst	temp
	breq	mgr_check_bootsektor

mgr_pierr:
	clr	temp
	ret

mgr_check_bootsektor:
;Pointer to first table entry
	ldiw	y,hostparttbl
	ldi	temp3,0			;temp3 holds number of found disks (paritions)

;Test, if it has a valid MBR

	lds	temp,hostbuf+510	;MBR signature (0xAA55)  at and of sector?
	lds	temp2,hostbuf+510+1
	ldi	temp4,0xAA
	cpi	temp,0x55		
	cpc	temp2,temp4
	breq	mgr_search

;No MBR, no partition table ...

	inc	temp3			;pretend we have one.
	sts	ndisks,temp3
	ldi	temp,high((1<<16) * 128/512)
	ldi     temp2,dskType_CPM
	std	y+0,temp2
	std	y+1,_0			;start at beginning of card
	std	y+2,_0
	std	y+3,_0
	std	y+4,_0
	std	y+5,_0			;max CP/M 2.2 disk size
	std	y+6,temp		;
;	std	y+7,_0
;	std	y+8,_0
	rjmp	mgr_pend

; Search for valid Partitions and ImageFiles 
mgr_search:
	ldiw	z,hostbuf+510-64	;Point to  first byte of partition table
	ldi	temp4,4			;Partition table has 4 entries.

mgr_ploop:

;	Get Partitiontype
	ldd	temp,z+PART_TYPE

;   Test for CP/M Partition
	cpi	temp,PARTID_CPM
	brne	mgr_nextp
	
	rcall	 cpm_add_partition

	inc	temp3
	sts	ndisks,temp3
	adiw	y,PARTENTRY_SIZE
	cpi	temp3,MAXDISKS
	breq	mgr_pend
	
mgr_nextp:
	adiw	zl,16
	dec	temp4
	brne	mgr_ploop

#if FAT16_SUPPORT

; Test for FAT16 Partition
	ldiw	z,hostbuf+510-64	;Point to  first byte of partition table
	ldi	temp4,4

mgr_ploop2:
;	Get Partitiontype
	ldd	temp,z+PART_TYPE

;   Test for FAT Partition Type 1
	cpi	temp,PARTID1_FAT16
	breq	mgr_fatfound

;   Test for FAT Partition Type 2
	cpi	temp,PARTID2_FAT16
	brne	mgr_nextp2

mgr_fatfound:
	rcall	fat_add_partition
	rcall	fat_scan_partition
	rcall	fat_reset_cache
	rjmp	mgr_pend		;Stop after first FAT16 partition found.

mgr_nextp2:
	adiw	zl,16
	dec	temp4
	brne	mgr_ploop2
#endif

mgr_pend:
	lds	temp,ndisks		;return # of "disks"
	tst	temp
	ret


; ====================================================================
; Function: Print partition table info
; ====================================================================
; Parameters
; --------------------------------------------------------------------
; Registers  :  none
; Variables  :  [r] hostparttbl		Table with Partitioninformations
;               [r] hostparttbltop	Pointer to the Top of the Table
; --------------------------------------------------------------------
; Description:
; ====================================================================

mgr_prnt_parttbl:
	ldiw	z,hostparttbl
	lds	yl,ndisks
	ldi	xh,'A'

pprl:
	ldd	temp ,z+1		;Get partition start
	ldd	temp2,z+2
	ldd	temp3,z+3
	ldd	temp4,z+4

	printnewline

	cp	temp,_0			;If zero ...
	cpc	temp2,_0
	cpc	temp3,_0
	cpc	temp4,_0
	breq	mgr_prnop		;... no partition table at 0

; Partitiontype examining
	ldd 	xl,z+0
	andi	xl,dskType_MASK
; CP/M ?
	cpi	xl,dskType_CPM
	brne 	mgr_prtb_nocpm
	rcall   mgr_prnt_diskname
	rcall	mgr_prnt_table_cpm
	rjmp	mgr_prnt_size

mgr_prtb_nocpm:
#if FAT16_SUPPORT
; FAT16 ?
	cpi	xl,dskType_FAT
	brne 	mgr_prtb_nofat
	rcall   mgr_prnt_diskname
	rcall	mgr_prnt_table_fat
	rjmp	mgr_prnt_size
mgr_prtb_nofat:
#endif
#if 0					/* RAMDISK is not on SD card */
; RAMDISK ?
	cpi	xl,dskType_RAM
	brne 	mgr_prnt_err
	rcall   mgr_prnt_diskname
	rcall	mgr_prnt_table_ram
	rjmp	mgr_prnt_size
#endif
mgr_prnt_err:	
; Entry Error
	rcall	mgr_prnt_table_err
	rjmp	mgr_prnt_size

mgr_prnop:
	rcall   mgr_prnt_diskname
	rcall	mgr_prnt_image

mgr_prnt_size:
	lcall	print_ultoa
	printstring ", size: "

	ldd	temp ,z+5		;Get partition size
	ldd	temp2,z+6
	ldi	temp3,0
	ldi	temp4,0

	lsr	temp4
	ror	temp3
	ror	temp2
	ror	temp
	lcall	print_ultoa
	printstring "KB."

mgr_goto_next_part:	
	adiw	z,PARTENTRY_SIZE
	inc	xh
	dec	yl
	brne	pprl

mgr_pppre:
	ret
	

mgr_prnt_diskname:
	push	temp
	mov	temp,xh
	lcall	uartputc
	ldi	temp,':'
	lcall	uartputc
	pop	temp
	ret

mgr_prnt_table_cpm:
	printstring "CP/M partition at: "
	ret

mgr_prnt_table_fat:
	printstring "FAT16 File-Image at: "
	ret

mgr_prnt_table_ram:
	printstring "Ramdisk at: "
	ret

mgr_prnt_table_err:
	printstring "Unknown Entry at: "
	ret

mgr_prnt_image:
	printstring "Assuming CP/M image at: "
	ret
Commit	Line	Data
92202636 L	1	; Various Management functions for the Interaction with the File-
	2	; systems
	3	;
	4	; Copyright (C) 2010 Frank Zoll
	5	;
	6	; This file is part of avrcpm.
	7	;
	8	; avrcpm is free software: you can redistribute it and/or modify it
	9	; under the terms of the GNU General Public License as published by
	10	; the Free Software Foundation, either version 3 of the License, or
	11	; (at your option) any later version.
	12	;
	13	; avrcpm is distributed in the hope that it will be useful,
	14	; but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	; GNU General Public License for more details.
	17	;
	18	; You should have received a copy of the GNU General Public License
	19	; along with avrcpm. If not, see <http://www.gnu.org/licenses/>.
	20	;
	21	; $Id$
	22	;
	23
	24
637689de	25	; -------------------------- Defines for the disk management Structures
92202636	26
637689de	27	; Partition Table Structures
92202636	28
637689de L	29	#define PART_TYPE 4
	30	#define PART_START 8
	31	#define PART_SIZE 12
92202636	32
637689de L	33	/*
	34	* Partition table id
	35	* (see http://www.win.tue.nl/~aeb/partitions/partition_types-1.html)
	36	*/
	37	#define PARTID1_FAT16 0x0E
	38	#define PARTID2_FAT16 0x06
	39	#define PARTID_CPM 0x52
	40
	41
	42	; ------------------------------------------------ Start of Code Segment
92202636 L	43	.cseg
	44
	45	; ====================================================================
	46	; Function: Scans a Disk for CP/M Partions
	47	; ====================================================================
	48	; Parameters
	49	; --------------------------------------------------------------------
	50	;
	51	; Registers : [w] temp Number of disk images (raw and fat16) found.
	52	; + 0x80 if sd card changes. (not used, doesn't work)
	53	; SREG : Z according to temp
	54	; --------------------------------------------------------------------
	55	; Description:
	56	; This Function scans an SD-Cards Boot-Sector for valid Partitions.
	57	; First all original CP/M Partitions will be usesed as Drives for
	58	; the CPM-System. Wenn all CP/M Partitions are found, a second
	59	; scann will be made. In the second Scan, the first FAT16 Partition
	60	; on the Disk will be used for a detailed analyses. If there
	61	; are any Files like "cpm_x.img" are found, these Files will be
	62	; used as Disks by the CP/M- System. ( x must be in the Range A to D )
	63	; ====================================================================
	64	mgr_init_partitions:
	65
	66	sts ndisks,_0 ; Set Number of Disks to 0
	67
	68	; Initialize partition table
	69	ldiw y,hostparttbl
	70	ldi temp2,PARTENTRY_SIZE*MAXDISKS
	71	mgr_picl:
	72	st y+,_0
	73	dec temp2
	74	brne mgr_picl
	75
	76	; Start mmc Card interaction
	77	lcall mmcInit
	78	andi temp,MMCST_NOINIT & MMCST_NODISK
	79	brne mgr_pierr
	80
	81	;Load first sector from MMC (boot sector)
	82	ldiw y,0 ; Sector 0
	83	movw x,y
	84	lcall mmcReadSect
	85	tst temp
	86	breq mgr_check_bootsektor
	87
	88	mgr_pierr:
	89	clr temp
	90	ret
	91
	92	mgr_check_bootsektor:
	93	;Pointer to first table entry
	94	ldiw y,hostparttbl
	95	ldi temp3,0 ;temp3 holds number of found disks (paritions)
	96
	97	;Test, if it has a valid MBR
	98
	99	lds temp,hostbuf+510 ;MBR signature (0xAA55) at and of sector?
	100	lds temp2,hostbuf+510+1
	101	ldi temp4,0xAA
	102	cpi temp,0x55
	103	cpc temp2,temp4
	104	breq mgr_search
	105
	106	;No MBR, no partition table ...
107
108	inc temp3 ;pretend we have one.
109	sts ndisks,temp3
110	ldi temp,high((1<<16) * 128/512)
111	ldi temp2,dskType_CPM
112	std y+0,temp2
113	std y+1,_0 ;start at beginning of card
114	std y+2,_0
115	std y+3,_0
116	std y+4,_0
117	std y+5,_0 ;max CP/M 2.2 disk size
118	std y+6,temp ;
637689de L	119	; std y+7,_0
637689de L	120	; std y+8,_0
92202636 L	121	rjmp mgr_pend
	122
	123	; Search for valid Partitions and ImageFiles
	124	mgr_search:
	125	ldiw z,hostbuf+510-64 ;Point to first byte of partition table
	126	ldi temp4,4 ;Partition table has 4 entries.
	127
	128	mgr_ploop:
	129
	130	; Get Partitiontype
	131	ldd temp,z+PART_TYPE
	132
	133	; Test for CP/M Partition
	134	cpi temp,PARTID_CPM
	135	brne mgr_nextp
	136
	137	rcall cpm_add_partition
	138
	139	inc temp3
	140	sts ndisks,temp3
637689de	141	adiw y,PARTENTRY_SIZE
92202636 L	142	cpi temp3,MAXDISKS
	143	breq mgr_pend
	144
	145	mgr_nextp:
	146	adiw zl,16
	147	dec temp4
	148	brne mgr_ploop
	149
	150	#if FAT16_SUPPORT
	151
	152	; Test for FAT16 Partition
	153	ldiw z,hostbuf+510-64 ;Point to first byte of partition table
	154	ldi temp4,4
	155
	156	mgr_ploop2:
	157	; Get Partitiontype
	158	ldd temp,z+PART_TYPE
	159
	160	; Test for FAT Partition Type 1
	161	cpi temp,PARTID1_FAT16
	162	breq mgr_fatfound
	163
	164	; Test for FAT Partition Type 2
	165	cpi temp,PARTID2_FAT16
	166	brne mgr_nextp2
	167
	168	mgr_fatfound:
	169	rcall fat_add_partition
	170	rcall fat_scan_partition
	171	rcall fat_reset_cache
	172	rjmp mgr_pend ;Stop after first FAT16 partition found.
	173
	174	mgr_nextp2:
	175	adiw zl,16
	176	dec temp4
	177	brne mgr_ploop2
	178	#endif
	179
	180	mgr_pend:
	181	lds temp,ndisks ;return # of "disks"
	182	tst temp
	183	ret
	184
	185
	186	; ====================================================================
	187	; Function: Print partition table info
	188	; ====================================================================
	189	; Parameters
	190	; --------------------------------------------------------------------
	191	; Registers : none
	192	; Variables : [r] hostparttbl Table with Partitioninformations
	193	; [r] hostparttbltop Pointer to the Top of the Table
	194	; --------------------------------------------------------------------
	195	; Description:
	196	; ====================================================================
	197
	198	mgr_prnt_parttbl:
	199	ldiw z,hostparttbl
	200	lds yl,ndisks
	201	ldi xh,'A'
	202
	203	pprl:
	204	ldd temp ,z+1 ;Get partition start
	205	ldd temp2,z+2
206	ldd temp3,z+3
207	ldd temp4,z+4
208
209	printnewline
210
211	cp temp,_0 ;If zero ...
212	cpc temp2,_0
213	cpc temp3,_0
214	cpc temp4,_0
215	breq mgr_prnop ;... no partition table at 0
216
217	; Partitiontype examining
218	ldd xl,z+0
637689de	219	andi xl,dskType_MASK
92202636 L	220	; CP/M ?
	221	cpi xl,dskType_CPM
	222	brne mgr_prtb_nocpm
	223	rcall mgr_prnt_diskname
	224	rcall mgr_prnt_table_cpm
	225	rjmp mgr_prnt_size
	226
	227	mgr_prtb_nocpm:
	228	#if FAT16_SUPPORT
	229	; FAT16 ?
	230	cpi xl,dskType_FAT
	231	brne mgr_prtb_nofat
	232	rcall mgr_prnt_diskname
	233	rcall mgr_prnt_table_fat
	234	rjmp mgr_prnt_size
	235	mgr_prtb_nofat:
	236	#endif
	237	#if 0 /* RAMDISK is not on SD card */
	238	; RAMDISK ?
	239	cpi xl,dskType_RAM
	240	brne mgr_prnt_err
	241	rcall mgr_prnt_diskname
	242	rcall mgr_prnt_table_ram
	243	rjmp mgr_prnt_size
	244	#endif
	245	mgr_prnt_err:
	246	; Entry Error
	247	rcall mgr_prnt_table_err
	248	rjmp mgr_prnt_size
	249
	250	mgr_prnop:
	251	rcall mgr_prnt_diskname
	252	rcall mgr_prnt_image
	253
	254	mgr_prnt_size:
	255	lcall print_ultoa
	256	printstring ", size: "
	257
	258	ldd temp ,z+5 ;Get partition size
	259	ldd temp2,z+6
637689de L	260	ldi temp3,0
637689de L	261	ldi temp4,0
92202636 L	262
	263	lsr temp4
	264	ror temp3
	265	ror temp2
	266	ror temp
	267	lcall print_ultoa
	268	printstring "KB."
	269
	270	mgr_goto_next_part:
	271	adiw z,PARTENTRY_SIZE
	272	inc xh
	273	dec yl
	274	brne pprl
	275
	276	mgr_pppre:
	277	ret
	278
	279
92202636 L	280	mgr_prnt_diskname:
	281	push temp
	282	mov temp,xh
	283	lcall uartputc
	284	ldi temp,':'
	285	lcall uartputc
	286	pop temp
	287	ret
	288
	289	mgr_prnt_table_cpm:
	290	printstring "CP/M partition at: "
	291	ret
	292
	293	mgr_prnt_table_fat:
	294	printstring "FAT16 File-Image at: "
	295	ret
	296
	297	mgr_prnt_table_ram:
	298	printstring "Ramdisk at: "
	299	ret
	300
	301	mgr_prnt_table_err:
	302	printstring "Unknown Entry at: "
	303	ret
	304
	305	mgr_prnt_image:
	306	printstring "Assuming CP/M image at: "
	307	ret
	308
	309