// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001
* Hans-Joerg Frieden, Hyperion Entertainment
* Hans-JoergF@hyperion-entertainment.com
*/
#include <common.h>
#include <command.h>
#include <ide.h>
#include "part_amiga.h"
#ifdef CONFIG_HAVE_BLOCK_DEVICE
#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;
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++;
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;
g = (struct amiga_part_geometry *)&(p->environment);
bstr_print(p->drive_name);
printf("%6d\t%6d\t",
g->low_cyl * g->block_per_track * g->surfaces ,
(g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1);
print_disk_type(g->dos_type);
printf("\t%5d\n", 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(struct blk_desc *dev_desc)
{
int i;
int limit;
char *s;
s = env_get("amiga_scanlimit");
if (s)
limit = simple_strtoul(s, NULL, 10);
else
limit = AMIGA_BLOCK_LIMIT;
for (i=0; i<limit; i++)
{
ulong res = blk_dread(dev_desc, 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\n",i);
if (sum_block((struct block_header *)block_buffer) == 0)
{
PRINTF("FOUND\n");
memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
return (struct rigid_disk_block *)&rdb;
}
}
}
}
PRINTF("Done scanning, no RDB found\n");
return NULL;
}
/*
* 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(struct blk_desc *dev_desc)
{
int i;
int limit;
char *s;
s = env_get("amiga_scanlimit");
if (s)
limit = simple_strtoul(s, NULL, 10);
else
limit = AMIGA_BLOCK_LIMIT;
PRINTF("Scanning for BOOT from 0 to %d\n", limit);
for (i = 0; i < limit; i++)
{
ulong res = blk_dread(dev_desc, 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\n", i);
if (sum_block((struct block_header *)block_buffer) == 0)
{
PRINTF("Found valid bootcode block\n");
memcpy(&bootcode, boot, sizeof(struct bootcode_block));
return &bootcode;
}
}
}
}
PRINTF("No boot code found on disk\n");
return 0;
}
/*
* Test if the given partition has an Amiga partition table/Rigid
* Disk block
*/
static int part_test_amiga(struct blk_desc *dev_desc)
{
struct rigid_disk_block *rdb;
struct bootcode_block *bootcode;
PRINTF("part_test_amiga: Testing for an Amiga RDB partition\n");
rdb = get_rdisk(dev_desc);
if (rdb)
{
bootcode = get_bootcode(dev_desc);
if (bootcode)
PRINTF("part_test_amiga: bootable Amiga disk\n");
else
PRINTF("part_test_amiga: non-bootable Amiga disk\n");
return 0;
}
else
{
PRINTF("part_test_amiga: no RDB found\n");
return -1;
}
}
/*
* Find partition number partnum on the given drive.
*/
static struct partition_block *find_partition(struct blk_desc *dev_desc,
int partnum)
{
struct rigid_disk_block *rdb;
struct partition_block *p;
u32 block;
PRINTF("Trying to find partition block %d\n", partnum);
rdb = get_rdisk(dev_desc);
if (!rdb)
{
PRINTF("find_partition: no rdb found\n");
return NULL;
}
PRINTF("find_partition: Scanning partition list\n");
block = rdb->partition_list;
PRINTF("find_partition: partition list at 0x%x\n", block);
while (block != 0xFFFFFFFF)
{
ulong res = blk_dread(dev_desc, 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\n",block);
if (sum_block((struct block_header *)p) == 0)
{
if (partnum == 0) break;
else
{
partnum--;
block = p->next;
}
}
} else block = 0xFFFFFFFF;
} else block = 0xFFFFFFFF;
}
if (block == 0xFFFFFFFF)
{
PRINTF("PART block not found\n");
return NULL;
}
return (struct partition_block *)block_buffer;
}
/*
* Get info about a partition
*/
static int part_get_info_amiga(struct blk_desc *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((char *)info->name, p->drive_name);
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;
return 0;
}
static void part_print_amiga(struct blk_desc *dev_desc)
{
struct rigid_disk_block *rdb;
struct bootcode_block *boot;
struct partition_block *p;
u32 block;
int i = 1;
rdb = get_rdisk(dev_desc);
if (!rdb)
{
PRINTF("part_print_amiga: no rdb found\n");
return;
}
PRINTF("part_print_amiga: Scanning partition list\n");
block = rdb->partition_list;
PRINTF("part_print_amiga: partition list at 0x%x\n", block);
printf("Summary: DiskBlockSize: %d\n"
" Cylinders : %d\n"
" Sectors/Track: %d\n"
" Heads : %d\n\n",
rdb->block_bytes, rdb->cylinders, rdb->sectors,
rdb->heads);
printf(" First Num. \n"
"Nr. Part. Name Block Block Type Boot Priority\n");
while (block != 0xFFFFFFFF)
{
ulong res;
PRINTF("Trying to load block #0x%X\n", block);
res = blk_dread(dev_desc, 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\n",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\n");
}
}
U_BOOT_PART_TYPE(amiga) = {
.name = "AMIGA",
.part_type = PART_TYPE_AMIGA,
.max_entries = AMIGA_ENTRY_NUMBERS,
.get_info = part_get_info_amiga,
.print = part_print_amiga,
.test = part_test_amiga,
};
#endif