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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2001
4 * Hans-Joerg Frieden, Hyperion Entertainment
5 * Hans-JoergF@hyperion-entertainment.com
6 */
7#include <command.h>
8#include <env.h>
9#include <ide.h>
10#include "part_amiga.h"
11#include <part.h>
12#include <vsprintf.h>
13
14#undef AMIGA_DEBUG
15
16#ifdef AMIGA_DEBUG
17#define PRINTF(fmt, args...) printf(fmt ,##args)
18#else
19#define PRINTF(fmt, args...)
20#endif
21
22struct block_header
23{
24 u32 id;
25 u32 summed_longs;
26 s32 chk_sum;
27};
28
29static unsigned char block_buffer[DEFAULT_SECTOR_SIZE];
30static struct rigid_disk_block rdb = {0};
31static struct bootcode_block bootcode = {0};
32
33/*
34 * Copy a bcpl to a c string
35 */
36static void bcpl_strcpy(char *to, char *from)
37{
38 int len = *from++;
39
40 while (len)
41 {
42 *to++ = *from++;
43 len--;
44 }
45 *to = 0;
46}
47
48/*
49 * Print a BCPL String. BCPL strings start with a byte with the length
50 * of the string, and don't contain a terminating nul character
51 */
52static void bstr_print(char *string)
53{
54 int len = *string++;
55 char buffer[256];
56 int i;
57
58 i = 0;
59 while (len)
60 {
61 buffer[i++] = *string++;
62 len--;
63 }
64
65 buffer[i] = 0;
66 printf("%-10s", buffer);
67}
68
69/*
70 * Sum a block. The checksum of a block must end up at zero
71 * to be valid. The chk_sum field is selected so that adding
72 * it yields zero.
73 */
74int sum_block(struct block_header *header)
75{
76 s32 *block = (s32 *)header;
77 u32 i;
78 s32 sum = 0;
79
80 for (i = 0; i < header->summed_longs; i++)
81 sum += *block++;
82
83 return (sum != 0);
84}
85
86/*
87 * Print an AmigaOS disk type. Disk types are a four-byte identifier
88 * describing the file system. They are usually written as a three-letter
89 * word followed by a backslash and a version number. For example,
90 * DOS\0 would be the original file system. SFS\0 would be SmartFileSystem.
91 * DOS\1 is FFS.
92 */
93static void print_disk_type(u32 disk_type)
94{
95 char buffer[6];
96 buffer[0] = (disk_type & 0xFF000000)>>24;
97 buffer[1] = (disk_type & 0x00FF0000)>>16;
98 buffer[2] = (disk_type & 0x0000FF00)>>8;
99 buffer[3] = '\\';
100 buffer[4] = (disk_type & 0x000000FF) + '0';
101 buffer[5] = 0;
102 printf("%s", buffer);
103}
104
105/*
106 * Print the info contained within the given partition block
107 */
108static void print_part_info(struct partition_block *p)
109{
110 struct amiga_part_geometry *g;
111
112 g = (struct amiga_part_geometry *)&(p->environment);
113
114 bstr_print(p->drive_name);
115 printf("%6d\t%6d\t",
116 g->low_cyl * g->block_per_track * g->surfaces ,
117 (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1);
118 print_disk_type(g->dos_type);
119 printf("\t%5d\n", g->boot_priority);
120}
121
122/*
123 * Search for the Rigid Disk Block. The rigid disk block is required
124 * to be within the first 16 blocks of a drive, needs to have
125 * the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid
126 * sum-to-zero checksum
127 */
128struct rigid_disk_block *get_rdisk(struct blk_desc *desc)
129{
130 int i;
131 int limit;
132 char *s;
133
134 s = env_get("amiga_scanlimit");
135 if (s)
136 limit = dectoul(s, NULL);
137 else
138 limit = AMIGA_BLOCK_LIMIT;
139
140 for (i=0; i<limit; i++)
141 {
142 ulong res = blk_dread(desc, i, 1, (ulong *)block_buffer);
143 if (res == 1)
144 {
145 struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer;
146 if (trdb->id == AMIGA_ID_RDISK)
147 {
148 PRINTF("Rigid disk block suspect at %d, checking checksum\n",i);
149 if (sum_block((struct block_header *)block_buffer) == 0)
150 {
151 PRINTF("FOUND\n");
152 memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
153 return (struct rigid_disk_block *)&rdb;
154 }
155 }
156 }
157 }
158 PRINTF("Done scanning, no RDB found\n");
159 return NULL;
160}
161
162/*
163 * Search for boot code
164 * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the
165 * Ridgid disk block
166 */
167
168struct bootcode_block *get_bootcode(struct blk_desc *desc)
169{
170 int i;
171 int limit;
172 char *s;
173
174 s = env_get("amiga_scanlimit");
175 if (s)
176 limit = dectoul(s, NULL);
177 else
178 limit = AMIGA_BLOCK_LIMIT;
179
180 PRINTF("Scanning for BOOT from 0 to %d\n", limit);
181
182 for (i = 0; i < limit; i++)
183 {
184 ulong res = blk_dread(desc, i, 1, (ulong *)block_buffer);
185 if (res == 1)
186 {
187 struct bootcode_block *boot = (struct bootcode_block *)block_buffer;
188 if (boot->id == AMIGA_ID_BOOT)
189 {
190 PRINTF("BOOT block at %d, checking checksum\n", i);
191 if (sum_block((struct block_header *)block_buffer) == 0)
192 {
193 PRINTF("Found valid bootcode block\n");
194 memcpy(&bootcode, boot, sizeof(struct bootcode_block));
195 return &bootcode;
196 }
197 }
198 }
199 }
200
201 PRINTF("No boot code found on disk\n");
202 return 0;
203}
204
205/*
206 * Test if the given partition has an Amiga partition table/Rigid
207 * Disk block
208 */
209static int part_test_amiga(struct blk_desc *desc)
210{
211 struct rigid_disk_block *rdb;
212 struct bootcode_block *bootcode;
213
214 PRINTF("part_test_amiga: Testing for an Amiga RDB partition\n");
215
216 rdb = get_rdisk(desc);
217 if (rdb)
218 {
219 bootcode = get_bootcode(desc);
220 if (bootcode)
221 PRINTF("part_test_amiga: bootable Amiga disk\n");
222 else
223 PRINTF("part_test_amiga: non-bootable Amiga disk\n");
224
225 return 0;
226 }
227 else
228 {
229 PRINTF("part_test_amiga: no RDB found\n");
230 return -1;
231 }
232
233}
234
235/*
236 * Find partition number partnum on the given drive.
237 */
238static struct partition_block *find_partition(struct blk_desc *desc,
239 int partnum)
240{
241 struct rigid_disk_block *rdb;
242 struct partition_block *p;
243 u32 block;
244
245 PRINTF("Trying to find partition block %d\n", partnum);
246 rdb = get_rdisk(desc);
247 if (!rdb)
248 {
249 PRINTF("find_partition: no rdb found\n");
250 return NULL;
251 }
252
253 PRINTF("find_partition: Scanning partition list\n");
254
255 block = rdb->partition_list;
256 PRINTF("find_partition: partition list at 0x%x\n", block);
257
258 while (block != 0xFFFFFFFF)
259 {
260 ulong res = blk_dread(desc, block, 1, (ulong *)block_buffer);
261 if (res == 1)
262 {
263 p = (struct partition_block *)block_buffer;
264 if (p->id == AMIGA_ID_PART)
265 {
266 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
267 if (sum_block((struct block_header *)p) == 0)
268 {
269 if (partnum == 0) break;
270 else
271 {
272 partnum--;
273 block = p->next;
274 }
275 }
276 } else block = 0xFFFFFFFF;
277 } else block = 0xFFFFFFFF;
278 }
279
280 if (block == 0xFFFFFFFF)
281 {
282 PRINTF("PART block not found\n");
283 return NULL;
284 }
285
286 return (struct partition_block *)block_buffer;
287}
288
289/*
290 * Get info about a partition
291 */
292static int part_get_info_amiga(struct blk_desc *desc, int part,
293 struct disk_partition *info)
294{
295 struct partition_block *p = find_partition(desc, part - 1);
296 struct amiga_part_geometry *g;
297 u32 disk_type;
298
299 if (!p) return -1;
300
301 g = (struct amiga_part_geometry *)&(p->environment);
302 info->start = g->low_cyl * g->block_per_track * g->surfaces;
303 info->size = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1;
304 info->blksz = rdb.block_bytes;
305 bcpl_strcpy((char *)info->name, p->drive_name);
306
307 disk_type = g->dos_type;
308
309 info->type[0] = (disk_type & 0xFF000000)>>24;
310 info->type[1] = (disk_type & 0x00FF0000)>>16;
311 info->type[2] = (disk_type & 0x0000FF00)>>8;
312 info->type[3] = '\\';
313 info->type[4] = (disk_type & 0x000000FF) + '0';
314 info->type[5] = 0;
315
316 return 0;
317}
318
319static void part_print_amiga(struct blk_desc *desc)
320{
321 struct rigid_disk_block *rdb;
322 struct bootcode_block *boot;
323 struct partition_block *p;
324 u32 block;
325 int i = 1;
326
327 rdb = get_rdisk(desc);
328 if (!rdb)
329 {
330 PRINTF("part_print_amiga: no rdb found\n");
331 return;
332 }
333
334 PRINTF("part_print_amiga: Scanning partition list\n");
335
336 block = rdb->partition_list;
337 PRINTF("part_print_amiga: partition list at 0x%x\n", block);
338
339 printf("Summary: DiskBlockSize: %d\n"
340 " Cylinders : %d\n"
341 " Sectors/Track: %d\n"
342 " Heads : %d\n\n",
343 rdb->block_bytes, rdb->cylinders, rdb->sectors,
344 rdb->heads);
345
346 printf(" First Num. \n"
347 "Nr. Part. Name Block Block Type Boot Priority\n");
348
349 while (block != 0xFFFFFFFF)
350 {
351 ulong res;
352
353 PRINTF("Trying to load block #0x%X\n", block);
354
355 res = blk_dread(desc, block, 1, (ulong *)block_buffer);
356 if (res == 1)
357 {
358 p = (struct partition_block *)block_buffer;
359 if (p->id == AMIGA_ID_PART)
360 {
361 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
362 if (sum_block((struct block_header *)p) == 0)
363 {
364 printf("%-4d ", i); i++;
365 print_part_info(p);
366 block = p->next;
367 }
368 } else block = 0xFFFFFFFF;
369 } else block = 0xFFFFFFFF;
370 }
371
372 boot = get_bootcode(desc);
373 if (boot)
374 {
375 printf("Disk is bootable\n");
376 }
377}
378
379U_BOOT_PART_TYPE(amiga) = {
380 .name = "AMIGA",
381 .part_type = PART_TYPE_AMIGA,
382 .max_entries = AMIGA_ENTRY_NUMBERS,
383 .get_info = part_get_info_amiga,
384 .print = part_print_amiga,
385 .test = part_test_amiga,
386};