--- /dev/null
+/* This file is part of the program psim.
+
+ Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ */
+
+
+#ifndef _PK_DISKLABEL_C_
+#define _PK_DISKLABEL_C_
+
+#ifndef STATIC_INLINE_PK_DISKLABEL
+#define STATIC_INLINE_PK_DISKLABEL STATIC_INLINE
+#endif
+
+#include "device_table.h"
+
+#include "pk.h"
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+
+
+/* PACKAGE
+
+ disk-label - all knowing disk I/O package
+
+ DESCRIPTION
+
+ The disk-label package provides a generic interface to disk
+ devices. It uses the arguments specified when an instance is being
+ created to determine if the raw disk, a partition, or a file within
+ a partition should be opened.
+
+ An instance create call to disk-label could result, for instance,
+ in the opening of a DOS file system contained within a dos
+ partition contained within a physical disk.
+
+ */
+
+/* taken from bfd/ppcboot.c by Michael Meissner */
+
+/* PPCbug location structure */
+typedef struct ppcboot_location {
+ unsigned8 ind;
+ unsigned8 head;
+ unsigned8 sector;
+ unsigned8 cylinder;
+} ppcboot_location_t;
+
+/* PPCbug partition table layout */
+typedef struct ppcboot_partition {
+ ppcboot_location_t partition_begin; /* partition begin */
+ ppcboot_location_t partition_end; /* partition end */
+ unsigned8 sector_begin[4]; /* 32-bit start RBA (zero-based), little endian */
+ unsigned8 sector_length[4]; /* 32-bit RBA count (one-based), little endian */
+} ppcboot_partition_t;
+
+#if 0
+/* PPCbug boot layout. */
+typedef struct ppcboot_hdr {
+ unsigned8 pc_compatibility[446]; /* x86 instruction field */
+ ppcboot_partition_t partition[4]; /* partition information */
+ unsigned8 signature[2]; /* 0x55 and 0xaa */
+ unsigned8 entry_offset[4]; /* entry point offset, little endian */
+ unsigned8 length[4]; /* load image length, little endian */
+ unsigned8 flags; /* flag field */
+ unsigned8 os_id; /* OS_ID */
+ char partition_name[32]; /* partition name */
+ unsigned8 reserved1[470]; /* reserved */
+} ppcboot_hdr_t;
+#endif
+
+
+typedef struct _disklabel {
+ device_instance *parent;
+ device_instance *raw_disk;
+ unsigned_word pos;
+ unsigned_word sector_begin;
+ unsigned_word sector_length;
+} disklabel;
+
+
+static unsigned_word
+sector2uw(unsigned8 s[4])
+{
+ return ((s[3] << 24)
+ + (s[2] << 16)
+ + (s[1] << 8)
+ + (s[0] << 0));
+}
+
+
+static void
+disklabel_delete(device_instance *instance)
+{
+ disklabel *label = device_instance_data(instance);
+ device_instance_delete(label->raw_disk);
+ zfree(label);
+}
+
+
+static int
+disklabel_read(device_instance *instance,
+ void *buf,
+ unsigned_word len)
+{
+ disklabel *label = device_instance_data(instance);
+ int nr_read;
+ if (label->pos + len > label->sector_length)
+ len = label->sector_length - label->pos;
+ if (device_instance_seek(label->raw_disk, 0,
+ label->sector_begin + label->pos) < 0)
+ return -1;
+ nr_read = device_instance_read(label->raw_disk, buf, len);
+ if (nr_read > 0)
+ label->pos += nr_read;
+ return nr_read;
+}
+
+static int
+disklabel_write(device_instance *instance,
+ const void *buf,
+ unsigned_word len)
+{
+ disklabel *label = device_instance_data(instance);
+ int nr_written;
+ if (label->pos + len > label->sector_length)
+ len = label->sector_length - label->pos;
+ if (device_instance_seek(label->raw_disk, 0,
+ label->sector_begin + label->pos) < 0)
+ return -1;
+ nr_written = device_instance_write(label->raw_disk, buf, len);
+ if (nr_written > 0)
+ label->pos += nr_written;
+ return nr_written;
+}
+
+static int
+disklabel_seek(device_instance *instance,
+ unsigned_word pos_hi,
+ unsigned_word pos_lo)
+{
+ disklabel *label = device_instance_data(instance);
+ if (pos_lo >= label->sector_length || pos_hi != 0)
+ return -1;
+ label->pos = pos_lo;
+ return 0;
+}
+
+
+static const device_instance_callbacks package_disklabel_callbacks = {
+ disklabel_delete,
+ disklabel_read,
+ disklabel_write,
+ disklabel_seek,
+};
+
+/* Reconize different types of boot block */
+
+static int
+block_is_bpb(const unsigned8 block[])
+{
+ const char ebdic_ibma[] = { 0xc9, 0xc2, 0xd4, 0xc1 };
+ /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */
+ /* can't start with IBMA */
+ if (memcmp(block, ebdic_ibma, sizeof(ebdic_ibma)) == 0)
+ return 0;
+ /* must have LE 0xAA55 signature at offset 510 */
+ if (block[511] != 0xAA && block[510] != 0x55)
+ return 0;
+ /* valid 16 bit LE bytes per sector - 256, 512, 1024 */
+ if (block[11] != 0
+ || (block[12] != 1 && block[12] != 2 && block[12] != 4))
+ return 0;
+ /* nr fats is 1 or 2 */
+ if (block[16] != 1 && block[16] != 2)
+ return 0;
+ return 1;
+}
+
+/* is_iso9660() later ... */
+
+static int
+block_is_fdisk(const unsigned8 block[])
+{
+ const int partition_type_fields[] = { 0x1c2, 0x1d2, 0x1e2, 0x1f2, 0 };
+ int partition;
+ /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */
+ /* must have LE 0xAA55 signature at offset 510 */
+ if (block[511] != 0xAA && block[510] != 0x55)
+ return 0;
+ /* must contain valid partition types */
+ for (partition = 0;
+ partition_type_fields[partition] != 0;
+ partition++) {
+ switch (block[partition_type_fields[partition]]) {
+ case 4: case 0x41: case 0x96:
+ break;
+ case 5: case 6:
+ PTRACE(disklabel, ("extended partition types not supported\n"));
+ return 0;
+ case 0x82:
+ PTRACE(disklabel, ("warning - partition %d of type 0x82 - Solaris?\n", partition));
+ break;
+ case 0x1:
+ PTRACE(disklabel, ("warning - partition %d of type 1 - DOS12\n", partition));
+ break;
+ case 0:
+ break;
+ default:
+ PTRACE(disklabel, ("rejecting partition %d of type 0x%x\n", partition,
+ block[partition_type_fields[partition]]));
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int
+block_is_mac_disk(const unsigned8 block[])
+{
+ /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */
+ /* signature - BEx4552 at offset 0 */
+ if (block[0] != 0x45 || block[1] != 0x52)
+ return 0;
+ return 1;
+}
+
+
+/* Open a logical disk/file */
+
+device_instance *
+pk_disklabel_create_instance(device_instance *raw_disk,
+ const char *args)
+{
+ int partition;
+ char *filename;
+ unsigned8 boot_block[512];
+
+ /* parse the arguments */
+ if (args == NULL) {
+ partition = 0;
+ filename = NULL;
+ }
+ else {
+ partition = strtoul((char*)args, &filename, 0);
+ if (filename == args)
+ partition = -1; /* not specified */
+ if (*filename == ',')
+ filename++;
+ if (*filename == '\0')
+ filename = NULL; /* easier */
+ }
+
+ if (device_instance_seek(raw_disk, 0, 0) < 0)
+ device_error(device_instance_device(raw_disk),
+ "Problem seeking on raw disk\n");
+
+ if (partition < 0) {
+ /* select the active partition */
+ if (device_instance_read(raw_disk, &boot_block, sizeof(boot_block))
+ != sizeof(boot_block))
+ return raw_disk;
+ device_error(device_instance_device(raw_disk),
+ "selection of the active partition unimplemented\n");
+ return (device_instance *)0; /* silence warnings */
+ }
+ else if (partition == 0) {
+ /* select the raw disk */
+ return raw_disk;
+ }
+ else {
+ /* select the specified disk partition */
+ /* read in the boot record */
+ if (device_instance_read(raw_disk, &boot_block, sizeof(boot_block))
+ != sizeof(boot_block))
+ return raw_disk;
+ if (block_is_bpb(boot_block)) {
+ device_error(device_instance_device(raw_disk), "Unimplemented\n");
+ }
+ else if (block_is_fdisk(boot_block)) {
+ /* return an instance */
+ ppcboot_partition_t *partition_table = (ppcboot_partition_t*) &boot_block[446];
+ ppcboot_partition_t *partition_entry;
+ disklabel *label;
+ if (partition > 3)
+ device_error(device_instance_device(raw_disk),
+ "Invalid fdisk partition number %d\n", partition);
+ partition_entry = &partition_table[partition-1];
+ label = ZALLOC(disklabel);
+ label->raw_disk = raw_disk;
+ label->pos = 0;
+ label->sector_begin = 512 * sector2uw(partition_entry->sector_begin);
+ label->sector_length = 512 * sector2uw(partition_entry->sector_length);
+ PTRACE(disklabel, ("partition %ld, sector-begin %ld, length %ld\n",
+ (long)partition, (long)label->sector_begin, (long)label->sector_length));
+ if (filename != NULL)
+ device_error(device_instance_device(raw_disk),
+ "File names not yet supported\n");
+ return device_create_instance_from(NULL, raw_disk,
+ label,
+ NULL, args,
+ &package_disklabel_callbacks);
+ }
+ else if (block_is_mac_disk(boot_block)) {
+ device_error(device_instance_device(raw_disk), "Unimplemented\n");
+ }
+ else {
+ device_error(device_instance_device(raw_disk),
+ "Unreconized bootblock\n");
+ }
+ return raw_disk;
+ }
+
+}
+
+
+#endif /* _PK_DISKLABEL_C_ */
+
projects / external / binutils.git / commitdiff