binutils-gdb/sim/ppc/pk_disklabel.c

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/* This file is part of the program psim.
Copyright (C) 1994-1997, 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
block0_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;
}
/* Verify that the device contains an ISO-9660 File system */
static int
is_iso9660(device_instance *raw_disk)
{
/* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */
unsigned8 block[512];
if (device_instance_seek(raw_disk, 0, 512 * 64) < 0)
return 0;
if (device_instance_read(raw_disk, block, sizeof(block)) != sizeof(block))
return 0;
if (block[0] == 0x01
&& block[1] == 'C'
&& block[2] == 'D'
&& block[3] == '0'
&& block[4] == '0'
&& block[5] == '1')
return 1;
return 0;
}
/* Verify that the disk block contains a valid DOS partition table.
While we're at it have a look around for active partitions etc.
Return 0: invalid
Return 1..4: valid, value returned is the first active partition
Return -1: no active partition */
static int
block0_is_fdisk(const unsigned8 block[])
{
const int partition_type_fields[] = { 0, 0x1c2, 0x1d2, 0x1e2, 0x1f2 };
const int partition_active_fields[] = { 0, 0x1be, 0x1ce, 0x1de, 0xee };
int partition;
int active = -1;
/* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */
/* must have LE 0xAA55 signature at offset 510 */
if (block[511/*0x1ff*/] != 0xAA && block[510/*0x1fe*/] != 0x55)
return 0;
/* must contain valid partition types */
for (partition = 1; partition <= 4 && active != 0; partition++) {
int partition_type = block[partition_type_fields[partition]];
int is_active = block[partition_active_fields[partition]] == 0x80;
const char *type;
switch (partition_type) {
case 0x00:
type = "UNUSED";
break;
case 0x01:
type = "FAT 12 File system";
break;
case 0x04:
type = "FAT 16 File system";
break;
case 0x05:
case 0x06:
type = "rejected - extended/chained partition not supported";
active = 0;
break;
case 0x41:
type = "Single program image";
break;
case 0x82:
type = "Solaris?";
break;
case 0x96:
type = "ISO 9660 File system";
break;
default:
type = "rejected - unknown type";
active = 0;
break;
}
PTRACE(disklabel, ("partition %d of type 0x%02x - %s%s\n",
partition,
partition_type,
type,
is_active && active != 0 ? " (active)" : ""));
if (partition_type != 0 && is_active && active < 0)
active = partition;
}
return active;
}
/* Verify that block0 corresponds to a MAC disk */
static int
block0_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;
/* 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 (partition == 0) {
/* select the raw disk */
return raw_disk;
}
else {
unsigned8 boot_block[512];
/* get the boot block for examination */
if (device_instance_seek(raw_disk, 0, 0) < 0)
device_error(device_instance_device(raw_disk),
"Problem seeking on raw disk");
if (device_instance_read(raw_disk, &boot_block, sizeof(boot_block))
!= sizeof(boot_block))
device_error(device_instance_device(raw_disk), "Problem reading boot block");
if (partition < 0) {
/* select the active partition */
if (block0_is_bpb(boot_block)) {
device_error(device_instance_device(raw_disk), "Unimplemented active BPB");
}
else if (block0_is_fdisk(boot_block)) {
int active = block0_is_fdisk(boot_block);
device_error(device_instance_device(raw_disk), "Unimplemented active FDISK (%d)",
active);
}
else if (is_iso9660(raw_disk)) {
device_error(device_instance_device(raw_disk), "Unimplemented active ISO9660");
}
else if (block0_is_mac_disk(boot_block)) {
device_error(device_instance_device(raw_disk), "Unimplemented active MAC DISK");
}
else {
device_error(device_instance_device(raw_disk), "Unreconized bootblock");
}
}
else {
/* select the specified disk partition */
if (block0_is_bpb(boot_block)) {
device_error(device_instance_device(raw_disk), "Unimplemented BPB");
}
else if (block0_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 > 4)
device_error(device_instance_device(raw_disk),
"Only FDISK partitions 1..4 supported");
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),
"FDISK file names not yet supported");
return device_create_instance_from(NULL, raw_disk,
label,
NULL, args,
&package_disklabel_callbacks);
}
else if (block0_is_mac_disk(boot_block)) {
device_error(device_instance_device(raw_disk), "Unimplemented MAC DISK");
}
else {
device_error(device_instance_device(raw_disk),
"Unreconized bootblock");
}
}
}
return NULL;
}
#endif /* _PK_DISKLABEL_C_ */