1 // SPDX-License-Identifier: GPL-2.0+
4 * Hans-Joerg Frieden, Hyperion Entertainment
5 * Hans-JoergF@hyperion-entertainment.com
10 #include "part_amiga.h"
12 #ifdef CONFIG_HAVE_BLOCK_DEVICE
17 #define PRINTF(fmt, args...) printf(fmt ,##args)
19 #define PRINTF(fmt, args...)
29 static unsigned char block_buffer[DEFAULT_SECTOR_SIZE];
30 static struct rigid_disk_block rdb = {0};
31 static struct bootcode_block bootcode = {0};
34 * Copy a bcpl to a c string
36 static void bcpl_strcpy(char *to, char *from)
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
52 static void bstr_print(char *string)
61 buffer[i++] = *string++;
66 printf("%-10s", buffer);
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
74 int sum_block(struct block_header *header)
76 s32 *block = (s32 *)header;
80 for (i = 0; i < header->summed_longs; i++)
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.
93 static void print_disk_type(u32 disk_type)
96 buffer[0] = (disk_type & 0xFF000000)>>24;
97 buffer[1] = (disk_type & 0x00FF0000)>>16;
98 buffer[2] = (disk_type & 0x0000FF00)>>8;
100 buffer[4] = (disk_type & 0x000000FF) + '0';
102 printf("%s", buffer);
106 * Print the info contained within the given partition block
108 static void print_part_info(struct partition_block *p)
110 struct amiga_part_geometry *g;
112 g = (struct amiga_part_geometry *)&(p->environment);
114 bstr_print(p->drive_name);
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);
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
128 struct rigid_disk_block *get_rdisk(struct blk_desc *dev_desc)
134 s = env_get("amiga_scanlimit");
136 limit = simple_strtoul(s, NULL, 10);
138 limit = AMIGA_BLOCK_LIMIT;
140 for (i=0; i<limit; i++)
142 ulong res = blk_dread(dev_desc, i, 1, (ulong *)block_buffer);
145 struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer;
146 if (trdb->id == AMIGA_ID_RDISK)
148 PRINTF("Rigid disk block suspect at %d, checking checksum\n",i);
149 if (sum_block((struct block_header *)block_buffer) == 0)
152 memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
153 return (struct rigid_disk_block *)&rdb;
158 PRINTF("Done scanning, no RDB found\n");
163 * Search for boot code
164 * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the
168 struct bootcode_block *get_bootcode(struct blk_desc *dev_desc)
174 s = env_get("amiga_scanlimit");
176 limit = simple_strtoul(s, NULL, 10);
178 limit = AMIGA_BLOCK_LIMIT;
180 PRINTF("Scanning for BOOT from 0 to %d\n", limit);
182 for (i = 0; i < limit; i++)
184 ulong res = blk_dread(dev_desc, i, 1, (ulong *)block_buffer);
187 struct bootcode_block *boot = (struct bootcode_block *)block_buffer;
188 if (boot->id == AMIGA_ID_BOOT)
190 PRINTF("BOOT block at %d, checking checksum\n", i);
191 if (sum_block((struct block_header *)block_buffer) == 0)
193 PRINTF("Found valid bootcode block\n");
194 memcpy(&bootcode, boot, sizeof(struct bootcode_block));
201 PRINTF("No boot code found on disk\n");
206 * Test if the given partition has an Amiga partition table/Rigid
209 static int part_test_amiga(struct blk_desc *dev_desc)
211 struct rigid_disk_block *rdb;
212 struct bootcode_block *bootcode;
214 PRINTF("part_test_amiga: Testing for an Amiga RDB partition\n");
216 rdb = get_rdisk(dev_desc);
219 bootcode = get_bootcode(dev_desc);
221 PRINTF("part_test_amiga: bootable Amiga disk\n");
223 PRINTF("part_test_amiga: non-bootable Amiga disk\n");
229 PRINTF("part_test_amiga: no RDB found\n");
236 * Find partition number partnum on the given drive.
238 static struct partition_block *find_partition(struct blk_desc *dev_desc,
241 struct rigid_disk_block *rdb;
242 struct partition_block *p;
245 PRINTF("Trying to find partition block %d\n", partnum);
246 rdb = get_rdisk(dev_desc);
249 PRINTF("find_partition: no rdb found\n");
253 PRINTF("find_partition: Scanning partition list\n");
255 block = rdb->partition_list;
256 PRINTF("find_partition: partition list at 0x%x\n", block);
258 while (block != 0xFFFFFFFF)
260 ulong res = blk_dread(dev_desc, block, 1, (ulong *)block_buffer);
263 p = (struct partition_block *)block_buffer;
264 if (p->id == AMIGA_ID_PART)
266 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
267 if (sum_block((struct block_header *)p) == 0)
269 if (partnum == 0) break;
276 } else block = 0xFFFFFFFF;
277 } else block = 0xFFFFFFFF;
280 if (block == 0xFFFFFFFF)
282 PRINTF("PART block not found\n");
286 return (struct partition_block *)block_buffer;
290 * Get info about a partition
292 static int part_get_info_amiga(struct blk_desc *dev_desc, int part,
293 disk_partition_t *info)
295 struct partition_block *p = find_partition(dev_desc, part-1);
296 struct amiga_part_geometry *g;
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);
308 disk_type = g->dos_type;
310 info->type[0] = (disk_type & 0xFF000000)>>24;
311 info->type[1] = (disk_type & 0x00FF0000)>>16;
312 info->type[2] = (disk_type & 0x0000FF00)>>8;
313 info->type[3] = '\\';
314 info->type[4] = (disk_type & 0x000000FF) + '0';
320 static void part_print_amiga(struct blk_desc *dev_desc)
322 struct rigid_disk_block *rdb;
323 struct bootcode_block *boot;
324 struct partition_block *p;
328 rdb = get_rdisk(dev_desc);
331 PRINTF("part_print_amiga: no rdb found\n");
335 PRINTF("part_print_amiga: Scanning partition list\n");
337 block = rdb->partition_list;
338 PRINTF("part_print_amiga: partition list at 0x%x\n", block);
340 printf("Summary: DiskBlockSize: %d\n"
342 " Sectors/Track: %d\n"
344 rdb->block_bytes, rdb->cylinders, rdb->sectors,
347 printf(" First Num. \n"
348 "Nr. Part. Name Block Block Type Boot Priority\n");
350 while (block != 0xFFFFFFFF)
354 PRINTF("Trying to load block #0x%X\n", block);
356 res = blk_dread(dev_desc, block, 1, (ulong *)block_buffer);
359 p = (struct partition_block *)block_buffer;
360 if (p->id == AMIGA_ID_PART)
362 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
363 if (sum_block((struct block_header *)p) == 0)
365 printf("%-4d ", i); i++;
369 } else block = 0xFFFFFFFF;
370 } else block = 0xFFFFFFFF;
373 boot = get_bootcode(dev_desc);
376 printf("Disk is bootable\n");
380 U_BOOT_PART_TYPE(amiga) = {
382 .part_type = PART_TYPE_AMIGA,
383 .max_entries = AMIGA_ENTRY_NUMBERS,
384 .get_info = part_get_info_amiga,
385 .print = part_print_amiga,
386 .test = part_test_amiga,