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1/*
2 * (C) Copyright 2001
8bde7f77 3 * Hans-Joerg Frieden, Hyperion Entertainment
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4 * Hans-JoergF@hyperion-entertainment.com
5 *
1a459660 6 * SPDX-License-Identifier: GPL-2.0+
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7 */
8#include <common.h>
9#include <command.h>
10#include <ide.h>
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11#include "part_amiga.h"
12
2c1af9dc 13#ifdef HAVE_BLOCK_DEVICE
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14
15#undef AMIGA_DEBUG
16
17#ifdef AMIGA_DEBUG
18#define PRINTF(fmt, args...) printf(fmt ,##args)
19#else
20#define PRINTF(fmt, args...)
21#endif
22
23struct block_header
24{
25 u32 id;
26 u32 summed_longs;
27 s32 chk_sum;
28};
29
30static unsigned char block_buffer[DEFAULT_SECTOR_SIZE];
31static struct rigid_disk_block rdb = {0};
32static struct bootcode_block bootcode = {0};
33
34/*
35 * Copy a bcpl to a c string
36 */
37static void bcpl_strcpy(char *to, char *from)
38{
39 int len = *from++;
40
41 while (len)
42 {
43 *to++ = *from++;
44 len--;
45 }
46 *to = 0;
47}
48
49/*
50 * Print a BCPL String. BCPL strings start with a byte with the length
51 * of the string, and don't contain a terminating nul character
52 */
53static void bstr_print(char *string)
54{
55 int len = *string++;
56 char buffer[256];
57 int i;
8bde7f77 58
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59 i = 0;
60 while (len)
61 {
62 buffer[i++] = *string++;
63 len--;
64 }
65
66 buffer[i] = 0;
67 printf("%-10s", buffer);
68}
69
70/*
71 * Sum a block. The checksum of a block must end up at zero
72 * to be valid. The chk_sum field is selected so that adding
73 * it yields zero.
74 */
75int sum_block(struct block_header *header)
76{
77 s32 *block = (s32 *)header;
78 u32 i;
79 s32 sum = 0;
80
81 for (i = 0; i < header->summed_longs; i++)
82 sum += *block++;
8bde7f77 83
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84 return (sum != 0);
85}
86
87/*
88 * Print an AmigaOS disk type. Disk types are a four-byte identifier
89 * describing the file system. They are usually written as a three-letter
90 * word followed by a backslash and a version number. For example,
91 * DOS\0 would be the original file system. SFS\0 would be SmartFileSystem.
92 * DOS\1 is FFS.
93 */
94static void print_disk_type(u32 disk_type)
95{
96 char buffer[6];
97 buffer[0] = (disk_type & 0xFF000000)>>24;
98 buffer[1] = (disk_type & 0x00FF0000)>>16;
99 buffer[2] = (disk_type & 0x0000FF00)>>8;
100 buffer[3] = '\\';
101 buffer[4] = (disk_type & 0x000000FF) + '0';
102 buffer[5] = 0;
103 printf("%s", buffer);
104}
105
106/*
107 * Print the info contained within the given partition block
108 */
109static void print_part_info(struct partition_block *p)
110{
111 struct amiga_part_geometry *g;
8bde7f77 112
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113 g = (struct amiga_part_geometry *)&(p->environment);
114
115 bstr_print(p->drive_name);
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116 printf("%6d\t%6d\t",
117 g->low_cyl * g->block_per_track * g->surfaces ,
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118 (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1);
119 print_disk_type(g->dos_type);
120 printf("\t%5d\n", g->boot_priority);
121}
122
123/*
124 * Search for the Rigid Disk Block. The rigid disk block is required
125 * to be within the first 16 blocks of a drive, needs to have
126 * the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid
127 * sum-to-zero checksum
128 */
4101f687 129struct rigid_disk_block *get_rdisk(struct blk_desc *dev_desc)
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130{
131 int i;
132 int limit;
133 char *s;
134
00caae6d 135 s = env_get("amiga_scanlimit");
c7de829c 136 if (s)
75eb82ec 137 limit = simple_strtoul(s, NULL, 10);
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138 else
139 limit = AMIGA_BLOCK_LIMIT;
140
141 for (i=0; i<limit; i++)
142 {
2a981dc2 143 ulong res = blk_dread(dev_desc, i, 1, (ulong *)block_buffer);
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144 if (res == 1)
145 {
146 struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer;
147 if (trdb->id == AMIGA_ID_RDISK)
148 {
149 PRINTF("Rigid disk block suspect at %d, checking checksum\n",i);
150 if (sum_block((struct block_header *)block_buffer) == 0)
151 {
152 PRINTF("FOUND\n");
153 memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
154 return (struct rigid_disk_block *)&rdb;
155 }
156 }
157 }
158 }
159 PRINTF("Done scanning, no RDB found\n");
160 return NULL;
161}
162
8bde7f77 163/*
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164 * Search for boot code
165 * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the
166 * Ridgid disk block
167 */
168
4101f687 169struct bootcode_block *get_bootcode(struct blk_desc *dev_desc)
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170{
171 int i;
172 int limit;
173 char *s;
174
00caae6d 175 s = env_get("amiga_scanlimit");
c7de829c 176 if (s)
75eb82ec 177 limit = simple_strtoul(s, NULL, 10);
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178 else
179 limit = AMIGA_BLOCK_LIMIT;
180
181 PRINTF("Scanning for BOOT from 0 to %d\n", limit);
182
183 for (i = 0; i < limit; i++)
184 {
2a981dc2 185 ulong res = blk_dread(dev_desc, i, 1, (ulong *)block_buffer);
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186 if (res == 1)
187 {
188 struct bootcode_block *boot = (struct bootcode_block *)block_buffer;
189 if (boot->id == AMIGA_ID_BOOT)
190 {
191 PRINTF("BOOT block at %d, checking checksum\n", i);
192 if (sum_block((struct block_header *)block_buffer) == 0)
193 {
194 PRINTF("Found valid bootcode block\n");
195 memcpy(&bootcode, boot, sizeof(struct bootcode_block));
196 return &bootcode;
197 }
198 }
199 }
200 }
201
202 PRINTF("No boot code found on disk\n");
203 return 0;
204}
205
8bde7f77 206/*
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207 * Test if the given partition has an Amiga partition table/Rigid
208 * Disk block
209 */
084bf4c2 210static int part_test_amiga(struct blk_desc *dev_desc)
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211{
212 struct rigid_disk_block *rdb;
213 struct bootcode_block *bootcode;
214
084bf4c2 215 PRINTF("part_test_amiga: Testing for an Amiga RDB partition\n");
8bde7f77 216
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217 rdb = get_rdisk(dev_desc);
218 if (rdb)
219 {
220 bootcode = get_bootcode(dev_desc);
221 if (bootcode)
084bf4c2 222 PRINTF("part_test_amiga: bootable Amiga disk\n");
c7de829c 223 else
084bf4c2 224 PRINTF("part_test_amiga: non-bootable Amiga disk\n");
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225
226 return 0;
227 }
8bde7f77 228 else
c7de829c 229 {
084bf4c2 230 PRINTF("part_test_amiga: no RDB found\n");
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231 return -1;
232 }
233
234}
235
8bde7f77 236/*
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237 * Find partition number partnum on the given drive.
238 */
4101f687
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239static struct partition_block *find_partition(struct blk_desc *dev_desc,
240 int partnum)
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241{
242 struct rigid_disk_block *rdb;
243 struct partition_block *p;
244 u32 block;
245
246 PRINTF("Trying to find partition block %d\n", partnum);
247 rdb = get_rdisk(dev_desc);
8bde7f77 248 if (!rdb)
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249 {
250 PRINTF("find_partition: no rdb found\n");
251 return NULL;
252 }
8bde7f77 253
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254 PRINTF("find_partition: Scanning partition list\n");
255
256 block = rdb->partition_list;
257 PRINTF("find_partition: partition list at 0x%x\n", block);
258
259 while (block != 0xFFFFFFFF)
260 {
2a981dc2 261 ulong res = blk_dread(dev_desc, block, 1, (ulong *)block_buffer);
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262 if (res == 1)
263 {
264 p = (struct partition_block *)block_buffer;
265 if (p->id == AMIGA_ID_PART)
266 {
267 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
268 if (sum_block((struct block_header *)p) == 0)
269 {
270 if (partnum == 0) break;
8bde7f77 271 else
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272 {
273 partnum--;
274 block = p->next;
275 }
276 }
277 } else block = 0xFFFFFFFF;
278 } else block = 0xFFFFFFFF;
279 }
280
8bde7f77 281 if (block == 0xFFFFFFFF)
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282 {
283 PRINTF("PART block not found\n");
284 return NULL;
285 }
286
287 return (struct partition_block *)block_buffer;
288}
289
8bde7f77 290/*
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291 * Get info about a partition
292 */
3e8bd469 293static int part_get_info_amiga(struct blk_desc *dev_desc, int part,
96e5b03c 294 disk_partition_t *info)
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295{
296 struct partition_block *p = find_partition(dev_desc, part-1);
297 struct amiga_part_geometry *g;
298 u32 disk_type;
299
300 if (!p) return -1;
301
302 g = (struct amiga_part_geometry *)&(p->environment);
303 info->start = g->low_cyl * g->block_per_track * g->surfaces;
304 info->size = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1;
305 info->blksz = rdb.block_bytes;
95a6f9df 306 bcpl_strcpy((char *)info->name, p->drive_name);
8bde7f77 307
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308
309 disk_type = g->dos_type;
310
311 info->type[0] = (disk_type & 0xFF000000)>>24;
312 info->type[1] = (disk_type & 0x00FF0000)>>16;
313 info->type[2] = (disk_type & 0x0000FF00)>>8;
314 info->type[3] = '\\';
315 info->type[4] = (disk_type & 0x000000FF) + '0';
316 info->type[5] = 0;
8bde7f77 317
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318 return 0;
319}
320
084bf4c2 321static void part_print_amiga(struct blk_desc *dev_desc)
8bde7f77 322{
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323 struct rigid_disk_block *rdb;
324 struct bootcode_block *boot;
325 struct partition_block *p;
326 u32 block;
327 int i = 1;
328
329 rdb = get_rdisk(dev_desc);
8bde7f77 330 if (!rdb)
c7de829c 331 {
084bf4c2 332 PRINTF("part_print_amiga: no rdb found\n");
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333 return;
334 }
8bde7f77 335
084bf4c2 336 PRINTF("part_print_amiga: Scanning partition list\n");
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337
338 block = rdb->partition_list;
084bf4c2 339 PRINTF("part_print_amiga: partition list at 0x%x\n", block);
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340
341 printf("Summary: DiskBlockSize: %d\n"
342 " Cylinders : %d\n"
343 " Sectors/Track: %d\n"
344 " Heads : %d\n\n",
345 rdb->block_bytes, rdb->cylinders, rdb->sectors,
346 rdb->heads);
347
348 printf(" First Num. \n"
349 "Nr. Part. Name Block Block Type Boot Priority\n");
350
351 while (block != 0xFFFFFFFF)
352 {
353 ulong res;
354
355 PRINTF("Trying to load block #0x%X\n", block);
8bde7f77 356
2a981dc2 357 res = blk_dread(dev_desc, block, 1, (ulong *)block_buffer);
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358 if (res == 1)
359 {
360 p = (struct partition_block *)block_buffer;
361 if (p->id == AMIGA_ID_PART)
362 {
363 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
364 if (sum_block((struct block_header *)p) == 0)
365 {
366 printf("%-4d ", i); i++;
367 print_part_info(p);
368 block = p->next;
369 }
370 } else block = 0xFFFFFFFF;
371 } else block = 0xFFFFFFFF;
372 }
373
374 boot = get_bootcode(dev_desc);
375 if (boot)
376 {
377 printf("Disk is bootable\n");
378 }
379}
380
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381U_BOOT_PART_TYPE(amiga) = {
382 .name = "AMIGA",
383 .part_type = PART_TYPE_AMIGA,
87b8530f 384 .max_entries = AMIGA_ENTRY_NUMBERS,
3e8bd469 385 .get_info = part_get_info_amiga,
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386 .print = part_print_amiga,
387 .test = part_test_amiga,
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388};
389
c7de829c 390#endif