xref: /openbmc/u-boot/disk/part_amiga.c (revision 8c4445d2)
1 /*
2  * (C) Copyright 2001
3  * Hans-Joerg Frieden, Hyperion Entertainment
4  * Hans-JoergF@hyperion-entertainment.com
5  *
6  * See file CREDITS for list of people who contributed to this
7  * project.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation; either version 2 of
12  * the License, or (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22  * MA 02111-1307 USA
23  */
24 #include <common.h>
25 #include <command.h>
26 #include <ide.h>
27 #include "part_amiga.h"
28 
29 #if defined(CONFIG_CMD_IDE) || \
30     defined(CONFIG_CMD_SCSI) || \
31     defined(CONFIG_CMD_USB) || \
32     defined(CONFIG_MMC) || \
33     defined(CONFIG_SYSTEMACE)
34 
35 #undef AMIGA_DEBUG
36 
37 #ifdef AMIGA_DEBUG
38 #define PRINTF(fmt, args...) printf(fmt ,##args)
39 #else
40 #define PRINTF(fmt, args...)
41 #endif
42 
43 struct block_header
44 {
45     u32 id;
46     u32 summed_longs;
47     s32 chk_sum;
48 };
49 
50 static unsigned char block_buffer[DEFAULT_SECTOR_SIZE];
51 static struct rigid_disk_block rdb = {0};
52 static struct bootcode_block bootcode = {0};
53 
54 /*
55  * Copy a bcpl to a c string
56  */
57 static void bcpl_strcpy(char *to, char *from)
58 {
59     int len = *from++;
60 
61     while (len)
62     {
63 	*to++ = *from++;
64 	len--;
65     }
66     *to = 0;
67 }
68 
69 /*
70  * Print a BCPL String. BCPL strings start with a byte with the length
71  * of the string, and don't contain a terminating nul character
72  */
73 static void bstr_print(char *string)
74 {
75     int len = *string++;
76     char buffer[256];
77     int i;
78 
79     i = 0;
80     while (len)
81     {
82 	buffer[i++] = *string++;
83 	len--;
84     }
85 
86     buffer[i] = 0;
87     printf("%-10s", buffer);
88 }
89 
90 /*
91  * Sum a block. The checksum of a block must end up at zero
92  * to be valid. The chk_sum field is selected so that adding
93  * it yields zero.
94  */
95 int sum_block(struct block_header *header)
96 {
97     s32 *block = (s32 *)header;
98     u32 i;
99     s32 sum = 0;
100 
101     for (i = 0; i < header->summed_longs; i++)
102 	sum += *block++;
103 
104     return (sum != 0);
105 }
106 
107 /*
108  * Print an AmigaOS disk type. Disk types are a four-byte identifier
109  * describing the file system. They are usually written as a three-letter
110  * word followed by a backslash and a version number. For example,
111  * DOS\0 would be the original file system. SFS\0 would be SmartFileSystem.
112  * DOS\1 is FFS.
113  */
114 static void print_disk_type(u32 disk_type)
115 {
116     char buffer[6];
117     buffer[0] = (disk_type & 0xFF000000)>>24;
118     buffer[1] = (disk_type & 0x00FF0000)>>16;
119     buffer[2] = (disk_type & 0x0000FF00)>>8;
120     buffer[3] = '\\';
121     buffer[4] = (disk_type & 0x000000FF) + '0';
122     buffer[5] = 0;
123     printf("%s", buffer);
124 }
125 
126 /*
127  * Print the info contained within the given partition block
128  */
129 static void print_part_info(struct partition_block *p)
130 {
131     struct amiga_part_geometry *g;
132 
133     g = (struct amiga_part_geometry *)&(p->environment);
134 
135     bstr_print(p->drive_name);
136     printf("%6d\t%6d\t",
137 	   g->low_cyl * g->block_per_track * g->surfaces ,
138 	   (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1);
139     print_disk_type(g->dos_type);
140     printf("\t%5d\n", g->boot_priority);
141 }
142 
143 /*
144  * Search for the Rigid Disk Block. The rigid disk block is required
145  * to be within the first 16 blocks of a drive, needs to have
146  * the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid
147  * sum-to-zero checksum
148  */
149 struct rigid_disk_block *get_rdisk(block_dev_desc_t *dev_desc)
150 {
151     int i;
152     int limit;
153     char *s;
154 
155     s = getenv("amiga_scanlimit");
156     if (s)
157 	limit = simple_strtoul(s, NULL, 10);
158     else
159 	limit = AMIGA_BLOCK_LIMIT;
160 
161     for (i=0; i<limit; i++)
162     {
163 	ulong res = dev_desc->block_read(dev_desc->dev, i, 1,
164 					 (ulong *)block_buffer);
165 	if (res == 1)
166 	{
167 	    struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer;
168 	    if (trdb->id == AMIGA_ID_RDISK)
169 	    {
170 		PRINTF("Rigid disk block suspect at %d, checking checksum\n",i);
171 		if (sum_block((struct block_header *)block_buffer) == 0)
172 		{
173 		    PRINTF("FOUND\n");
174 		    memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
175 		    return (struct rigid_disk_block *)&rdb;
176 		}
177 	    }
178 	}
179     }
180     PRINTF("Done scanning, no RDB found\n");
181     return NULL;
182 }
183 
184 /*
185  * Search for boot code
186  * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the
187  * Ridgid disk block
188  */
189 
190 struct bootcode_block *get_bootcode(block_dev_desc_t *dev_desc)
191 {
192     int i;
193     int limit;
194     char *s;
195 
196     s = getenv("amiga_scanlimit");
197     if (s)
198 	limit = simple_strtoul(s, NULL, 10);
199     else
200 	limit = AMIGA_BLOCK_LIMIT;
201 
202     PRINTF("Scanning for BOOT from 0 to %d\n", limit);
203 
204     for (i = 0; i < limit; i++)
205     {
206 	ulong res = dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)block_buffer);
207 	if (res == 1)
208 	{
209 	    struct bootcode_block *boot = (struct bootcode_block *)block_buffer;
210 	    if (boot->id == AMIGA_ID_BOOT)
211 	    {
212 		PRINTF("BOOT block at %d, checking checksum\n", i);
213 		if (sum_block((struct block_header *)block_buffer) == 0)
214 		{
215 		    PRINTF("Found valid bootcode block\n");
216 		    memcpy(&bootcode, boot, sizeof(struct bootcode_block));
217 		    return &bootcode;
218 		}
219 	    }
220 	}
221     }
222 
223     PRINTF("No boot code found on disk\n");
224     return 0;
225 }
226 
227 /*
228  * Test if the given partition has an Amiga partition table/Rigid
229  * Disk block
230  */
231 int test_part_amiga(block_dev_desc_t *dev_desc)
232 {
233     struct rigid_disk_block *rdb;
234     struct bootcode_block *bootcode;
235 
236     PRINTF("test_part_amiga: Testing for an Amiga RDB partition\n");
237 
238     rdb = get_rdisk(dev_desc);
239     if (rdb)
240     {
241 	bootcode = get_bootcode(dev_desc);
242 	if (bootcode)
243 	    PRINTF("test_part_amiga: bootable Amiga disk\n");
244 	else
245 	    PRINTF("test_part_amiga: non-bootable Amiga disk\n");
246 
247 	return 0;
248     }
249     else
250     {
251 	PRINTF("test_part_amiga: no RDB found\n");
252 	return -1;
253     }
254 
255 }
256 
257 /*
258  * Find partition number partnum on the given drive.
259  */
260 static struct partition_block *find_partition(block_dev_desc_t *dev_desc, int partnum)
261 {
262     struct rigid_disk_block *rdb;
263     struct partition_block *p;
264     u32 block;
265 
266     PRINTF("Trying to find partition block %d\n", partnum);
267     rdb = get_rdisk(dev_desc);
268     if (!rdb)
269     {
270 	PRINTF("find_partition: no rdb found\n");
271 	return NULL;
272     }
273 
274     PRINTF("find_partition: Scanning partition list\n");
275 
276     block = rdb->partition_list;
277     PRINTF("find_partition: partition list at 0x%x\n", block);
278 
279     while (block != 0xFFFFFFFF)
280     {
281 	ulong res = dev_desc->block_read(dev_desc->dev, block, 1,
282 					 (ulong *)block_buffer);
283 	if (res == 1)
284 	{
285 	    p = (struct partition_block *)block_buffer;
286 	    if (p->id == AMIGA_ID_PART)
287 	    {
288 		PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
289 		if (sum_block((struct block_header *)p) == 0)
290 		{
291 		    if (partnum == 0) break;
292 		    else
293 		    {
294 			partnum--;
295 			block = p->next;
296 		    }
297 		}
298 	    } else block = 0xFFFFFFFF;
299 	} else block = 0xFFFFFFFF;
300     }
301 
302     if (block == 0xFFFFFFFF)
303     {
304 	PRINTF("PART block not found\n");
305 	return NULL;
306     }
307 
308     return (struct partition_block *)block_buffer;
309 }
310 
311 /*
312  * Get info about a partition
313  */
314 int get_partition_info_amiga (block_dev_desc_t *dev_desc, int part, disk_partition_t *info)
315 {
316     struct partition_block *p = find_partition(dev_desc, part-1);
317     struct amiga_part_geometry *g;
318     u32 disk_type;
319 
320     if (!p) return -1;
321 
322     g = (struct amiga_part_geometry *)&(p->environment);
323     info->start = g->low_cyl  * g->block_per_track * g->surfaces;
324     info->size  = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1;
325     info->blksz = rdb.block_bytes;
326     bcpl_strcpy(info->name, p->drive_name);
327 
328 
329     disk_type = g->dos_type;
330 
331     info->type[0] = (disk_type & 0xFF000000)>>24;
332     info->type[1] = (disk_type & 0x00FF0000)>>16;
333     info->type[2] = (disk_type & 0x0000FF00)>>8;
334     info->type[3] = '\\';
335     info->type[4] = (disk_type & 0x000000FF) + '0';
336     info->type[5] = 0;
337 
338     return 0;
339 }
340 
341 void print_part_amiga (block_dev_desc_t *dev_desc)
342 {
343     struct rigid_disk_block *rdb;
344     struct bootcode_block *boot;
345     struct partition_block *p;
346     u32 block;
347     int i = 1;
348 
349     rdb = get_rdisk(dev_desc);
350     if (!rdb)
351     {
352 	PRINTF("print_part_amiga: no rdb found\n");
353 	return;
354     }
355 
356     PRINTF("print_part_amiga: Scanning partition list\n");
357 
358     block = rdb->partition_list;
359     PRINTF("print_part_amiga: partition list at 0x%x\n", block);
360 
361     printf("Summary:  DiskBlockSize: %d\n"
362 	   "          Cylinders    : %d\n"
363 	   "          Sectors/Track: %d\n"
364 	   "          Heads        : %d\n\n",
365 	   rdb->block_bytes, rdb->cylinders, rdb->sectors,
366 	   rdb->heads);
367 
368     printf("                 First   Num. \n"
369 	   "Nr.  Part. Name  Block   Block  Type        Boot Priority\n");
370 
371     while (block != 0xFFFFFFFF)
372     {
373 	ulong res;
374 
375 	PRINTF("Trying to load block #0x%X\n", block);
376 
377 	res = dev_desc->block_read(dev_desc->dev, block, 1,
378 				   (ulong *)block_buffer);
379 	if (res == 1)
380 	{
381 	    p = (struct partition_block *)block_buffer;
382 	    if (p->id == AMIGA_ID_PART)
383 	    {
384 		PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
385 		if (sum_block((struct block_header *)p) == 0)
386 		{
387 		    printf("%-4d ", i); i++;
388 		    print_part_info(p);
389 		    block = p->next;
390 		}
391 	    } else block = 0xFFFFFFFF;
392 	} else block = 0xFFFFFFFF;
393     }
394 
395     boot = get_bootcode(dev_desc);
396     if (boot)
397     {
398 	printf("Disk is bootable\n");
399     }
400 }
401 
402 #endif
403