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