--- /dev/null
+/*
+ * (C) Copyright 2001
+ * Hans-Joerg Frieden, Hyperion Entertainment
+ * Hans-JoergF@hyperion-entertainment.com
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#include <common.h>
+#include <command.h>
+#include <ide.h>
+#include "part_amiga.h"
+
+#ifdef 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(block_dev_desc_t *dev_desc)
+{
+ int i;
+ int limit;
+ char *s;
+
+ s = getenv("amiga_scanlimit");
+ if (s)
+ limit = simple_strtoul(s, NULL, 10);
+ 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\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(block_dev_desc_t *dev_desc)
+{
+ int i;
+ int limit;
+ char *s;
+
+ s = getenv("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 = 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\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
+ */
+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\n");
+
+ rdb = get_rdisk(dev_desc);
+ if (rdb)
+ {
+ bootcode = get_bootcode(dev_desc);
+ if (bootcode)
+ PRINTF("test_part_amiga: bootable Amiga disk\n");
+ else
+ PRINTF("test_part_amiga: non-bootable Amiga disk\n");
+
+ return 0;
+ }
+ else
+ {
+ PRINTF("test_part_amiga: no RDB found\n");
+ return -1;
+ }
+
+}
+
+/*
+ * 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\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 = 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\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
+ */
+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);
+
+
+ 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;
+}
+
+void print_part_amiga (block_dev_desc_t *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("print_part_amiga: no rdb found\n");
+ return;
+ }
+
+ PRINTF("print_part_amiga: Scanning partition list\n");
+
+ block = rdb->partition_list;
+ PRINTF("print_part_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 = 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\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");
+ }
+}
+
+#endif
Code Review / kvmfornfv.git / blobdiff