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disk/part_amiga.c
8.62 KB
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/* * (C) Copyright 2001 |
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* Hans-Joerg Frieden, Hyperion Entertainment |
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* Hans-JoergF@hyperion-entertainment.com * |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ #include <common.h> #include <command.h> #include <ide.h> |
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#include "part_amiga.h" |
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#ifdef HAVE_BLOCK_DEVICE |
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#undef AMIGA_DEBUG #ifdef AMIGA_DEBUG #define PRINTF(fmt, args...) printf(fmt ,##args) #else #define PRINTF(fmt, args...) #endif struct block_header { u32 id; u32 summed_longs; s32 chk_sum; }; static unsigned char block_buffer[DEFAULT_SECTOR_SIZE]; static struct rigid_disk_block rdb = {0}; static struct bootcode_block bootcode = {0}; /* * Copy a bcpl to a c string */ static void bcpl_strcpy(char *to, char *from) { int len = *from++; while (len) { *to++ = *from++; len--; } *to = 0; } /* * Print a BCPL String. BCPL strings start with a byte with the length * of the string, and don't contain a terminating nul character */ static void bstr_print(char *string) { int len = *string++; char buffer[256]; int i; |
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i = 0; while (len) { buffer[i++] = *string++; len--; } buffer[i] = 0; printf("%-10s", buffer); } /* * Sum a block. The checksum of a block must end up at zero * to be valid. The chk_sum field is selected so that adding * it yields zero. */ int sum_block(struct block_header *header) { s32 *block = (s32 *)header; u32 i; s32 sum = 0; for (i = 0; i < header->summed_longs; i++) sum += *block++; |
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return (sum != 0); } /* * Print an AmigaOS disk type. Disk types are a four-byte identifier * describing the file system. They are usually written as a three-letter * word followed by a backslash and a version number. For example, * DOS\0 would be the original file system. SFS\0 would be SmartFileSystem. * DOS\1 is FFS. */ static void print_disk_type(u32 disk_type) { char buffer[6]; buffer[0] = (disk_type & 0xFF000000)>>24; buffer[1] = (disk_type & 0x00FF0000)>>16; buffer[2] = (disk_type & 0x0000FF00)>>8; buffer[3] = '\\'; buffer[4] = (disk_type & 0x000000FF) + '0'; buffer[5] = 0; printf("%s", buffer); } /* * Print the info contained within the given partition block */ static void print_part_info(struct partition_block *p) { struct amiga_part_geometry *g; |
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g = (struct amiga_part_geometry *)&(p->environment); bstr_print(p->drive_name); |
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printf("%6d\t%6d\t", g->low_cyl * g->block_per_track * g->surfaces , |
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(g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1); print_disk_type(g->dos_type); printf("\t%5d ", g->boot_priority); } /* * Search for the Rigid Disk Block. The rigid disk block is required * to be within the first 16 blocks of a drive, needs to have * the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid * sum-to-zero checksum */ struct rigid_disk_block *get_rdisk(block_dev_desc_t *dev_desc) { int i; int limit; char *s; s = getenv("amiga_scanlimit"); if (s) |
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limit = simple_strtoul(s, NULL, 10); |
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else limit = AMIGA_BLOCK_LIMIT; for (i=0; i<limit; i++) { ulong res = dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)block_buffer); if (res == 1) { struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer; if (trdb->id == AMIGA_ID_RDISK) { PRINTF("Rigid disk block suspect at %d, checking checksum ",i); if (sum_block((struct block_header *)block_buffer) == 0) { PRINTF("FOUND "); memcpy(&rdb, trdb, sizeof(struct rigid_disk_block)); return (struct rigid_disk_block *)&rdb; } } } } PRINTF("Done scanning, no RDB found "); return NULL; } |
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/* |
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* Search for boot code * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the * Ridgid disk block */ struct bootcode_block *get_bootcode(block_dev_desc_t *dev_desc) { int i; int limit; char *s; s = getenv("amiga_scanlimit"); if (s) |
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limit = simple_strtoul(s, NULL, 10); |
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else limit = AMIGA_BLOCK_LIMIT; PRINTF("Scanning for BOOT from 0 to %d ", limit); for (i = 0; i < limit; i++) { ulong res = dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)block_buffer); if (res == 1) { struct bootcode_block *boot = (struct bootcode_block *)block_buffer; if (boot->id == AMIGA_ID_BOOT) { PRINTF("BOOT block at %d, checking checksum ", i); if (sum_block((struct block_header *)block_buffer) == 0) { PRINTF("Found valid bootcode block "); memcpy(&bootcode, boot, sizeof(struct bootcode_block)); return &bootcode; } } } } PRINTF("No boot code found on disk "); return 0; } |
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/* |
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* Test if the given partition has an Amiga partition table/Rigid * Disk block */ int test_part_amiga(block_dev_desc_t *dev_desc) { struct rigid_disk_block *rdb; struct bootcode_block *bootcode; PRINTF("test_part_amiga: Testing for an Amiga RDB partition "); |
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rdb = get_rdisk(dev_desc); if (rdb) { bootcode = get_bootcode(dev_desc); if (bootcode) PRINTF("test_part_amiga: bootable Amiga disk "); else PRINTF("test_part_amiga: non-bootable Amiga disk "); return 0; } |
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else |
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{ PRINTF("test_part_amiga: no RDB found "); return -1; } } |
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/* |
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* Find partition number partnum on the given drive. */ static struct partition_block *find_partition(block_dev_desc_t *dev_desc, int partnum) { struct rigid_disk_block *rdb; struct partition_block *p; u32 block; PRINTF("Trying to find partition block %d ", partnum); rdb = get_rdisk(dev_desc); |
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if (!rdb) |
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{ PRINTF("find_partition: no rdb found "); return NULL; } |
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PRINTF("find_partition: Scanning partition list "); block = rdb->partition_list; PRINTF("find_partition: partition list at 0x%x ", block); while (block != 0xFFFFFFFF) { ulong res = dev_desc->block_read(dev_desc->dev, block, 1, (ulong *)block_buffer); if (res == 1) { p = (struct partition_block *)block_buffer; if (p->id == AMIGA_ID_PART) { PRINTF("PART block suspect at 0x%x, checking checksum ",block); if (sum_block((struct block_header *)p) == 0) { if (partnum == 0) break; |
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else |
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{ partnum--; block = p->next; } } } else block = 0xFFFFFFFF; } else block = 0xFFFFFFFF; } |
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if (block == 0xFFFFFFFF) |
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{ PRINTF("PART block not found "); return NULL; } return (struct partition_block *)block_buffer; } |
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/* |
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* Get info about a partition */ int get_partition_info_amiga (block_dev_desc_t *dev_desc, int part, disk_partition_t *info) { struct partition_block *p = find_partition(dev_desc, part-1); struct amiga_part_geometry *g; u32 disk_type; if (!p) return -1; g = (struct amiga_part_geometry *)&(p->environment); info->start = g->low_cyl * g->block_per_track * g->surfaces; info->size = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1; info->blksz = rdb.block_bytes; bcpl_strcpy(info->name, p->drive_name); |
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disk_type = g->dos_type; info->type[0] = (disk_type & 0xFF000000)>>24; info->type[1] = (disk_type & 0x00FF0000)>>16; info->type[2] = (disk_type & 0x0000FF00)>>8; info->type[3] = '\\'; info->type[4] = (disk_type & 0x000000FF) + '0'; info->type[5] = 0; |
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return 0; } void print_part_amiga (block_dev_desc_t *dev_desc) |
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{ |
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struct rigid_disk_block *rdb; struct bootcode_block *boot; struct partition_block *p; u32 block; int i = 1; rdb = get_rdisk(dev_desc); |
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if (!rdb) |
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{ PRINTF("print_part_amiga: no rdb found "); return; } |
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PRINTF("print_part_amiga: Scanning partition list "); block = rdb->partition_list; PRINTF("print_part_amiga: partition list at 0x%x ", block); printf("Summary: DiskBlockSize: %d " " Cylinders : %d " " Sectors/Track: %d " " Heads : %d ", rdb->block_bytes, rdb->cylinders, rdb->sectors, rdb->heads); printf(" First Num. " "Nr. Part. Name Block Block Type Boot Priority "); while (block != 0xFFFFFFFF) { ulong res; PRINTF("Trying to load block #0x%X ", block); |
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res = dev_desc->block_read(dev_desc->dev, block, 1, (ulong *)block_buffer); if (res == 1) { p = (struct partition_block *)block_buffer; if (p->id == AMIGA_ID_PART) { PRINTF("PART block suspect at 0x%x, checking checksum ",block); if (sum_block((struct block_header *)p) == 0) { printf("%-4d ", i); i++; print_part_info(p); block = p->next; } } else block = 0xFFFFFFFF; } else block = 0xFFFFFFFF; } boot = get_bootcode(dev_desc); if (boot) { printf("Disk is bootable "); } } #endif |