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/*
* linux/fs/partitions/acorn.c
*
* Copyright (c) 1996-2000 Russell King.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Scan ADFS partitions on hard disk drives.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/genhd.h>
#include <linux/fs.h>
#include "check.h"
#include "acorn.h"
static void
adfspart_setgeometry(kdev_t dev, unsigned int secspertrack, unsigned int heads)
{
#ifdef CONFIG_BLK_DEV_MFM
extern void xd_set_geometry(kdev_t dev, unsigned char, unsigned char,
unsigned long, unsigned int);
if (MAJOR(dev) == MFM_ACORN_MAJOR) {
unsigned long totalblocks = hd->part[MINOR(dev)].nr_sects;
xd_set_geometry(dev, secspertrack, heads, totalblocks, 1);
}
#endif
}
static struct adfs_discrecord *
adfs_partition(struct gendisk *hd, char *name, char *data,
unsigned long first_sector, int minor)
{
struct adfs_discrecord *dr;
unsigned int nr_sects;
if (adfs_checkbblk(data))
return NULL;
dr = (struct adfs_discrecord *)(data + 0x1c0);
if (dr->disc_size == 0 && dr->disc_size_high == 0)
return NULL;
nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) |
(le32_to_cpu(dr->disc_size) >> 9);
if (name)
printk(" [%s]", name);
add_gd_partition(hd, minor, first_sector, nr_sects);
return dr;
}
#ifdef CONFIG_ACORN_PARTITION_RISCIX
static int
riscix_partition(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sect, int minor, unsigned long nr_sects)
{
Sector sect;
struct riscix_record *rr;
rr = (struct riscix_record *)read_dev_sector(bdev, first_sect, §);
if (!rr)
return -1;
printk(" [RISCiX]");
if (rr->magic == RISCIX_MAGIC) {
unsigned long size = nr_sects > 2 ? 2 : nr_sects;
int part;
printk(" <");
add_gd_partition(hd, minor++, first_sect, size);
for (part = 0; part < 8; part++) {
if (rr->part[part].one &&
memcmp(rr->part[part].name, "All\0", 4)) {
add_gd_partition(hd, minor++,
le32_to_cpu(rr->part[part].start),
le32_to_cpu(rr->part[part].length));
printk("(%s)", rr->part[part].name);
}
}
printk(" >\n");
} else {
add_gd_partition(hd, minor++, first_sect, nr_sects);
}
put_dev_sector(sect);
return minor;
}
#endif
static int
linux_partition(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sect, int minor, unsigned long nr_sects)
{
Sector sect;
struct linux_part *linuxp;
unsigned int mask = (1 << hd->minor_shift) - 1;
unsigned long size = nr_sects > 2 ? 2 : nr_sects;
printk(" [Linux]");
add_gd_partition(hd, minor++, first_sect, size);
linuxp = (struct linux_part *)read_dev_sector(bdev, first_sect, §);
if (!linuxp)
return -1;
printk(" <");
while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
if (!(minor & mask))
break;
add_gd_partition(hd, minor++, first_sect +
le32_to_cpu(linuxp->start_sect),
le32_to_cpu(linuxp->nr_sects));
linuxp ++;
}
printk(" >");
put_dev_sector(sect);
return minor;
}
#ifdef CONFIG_ACORN_PARTITION_CUMANA
static int
adfspart_check_CUMANA(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sector, int minor)
{
unsigned int start_blk = 0, mask = (1 << hd->minor_shift) - 1;
Sector sect;
unsigned char *data;
char *name = "CUMANA/ADFS";
int first = 1;
/*
* Try Cumana style partitions - sector 3 contains ADFS boot block
* with pointer to next 'drive'.
*
* There are unknowns in this code - is the 'cylinder number' of the
* next partition relative to the start of this one - I'm assuming
* it is.
*
* Also, which ID did Cumana use?
*
* This is totally unfinished, and will require more work to get it
* going. Hence it is totally untested.
*/
do {
struct adfs_discrecord *dr;
unsigned int nr_sects;
if (!(minor & mask))
break;
data = read_dev_sector(bdev, start_blk * 2 + 6, §);
if (!data)
return -1;
dr = adfs_partition(hd, name, data, first_sector, minor++);
if (!dr)
break;
name = NULL;
nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *
(dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *
dr->secspertrack;
if (!nr_sects)
break;
first = 0;
first_sector += nr_sects;
start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
nr_sects = 0; /* hmm - should be partition size */
switch (data[0x1fc] & 15) {
case 0: /* No partition / ADFS? */
break;
#ifdef CONFIG_ACORN_PARTITION_RISCIX
case PARTITION_RISCIX_SCSI:
/* RISCiX - we don't know how to find the next one. */
minor = riscix_partition(hd, bdev, first_sector,
minor, nr_sects);
break;
#endif
case PARTITION_LINUX:
minor = linux_partition(hd, bdev, first_sector,
minor, nr_sects);
break;
}
put_dev_sector(sect);
if (minor == -1)
return minor;
} while (1);
put_dev_sector(sect);
return first ? 0 : 1;
}
#endif
#ifdef CONFIG_ACORN_PARTITION_ADFS
/*
* Purpose: allocate ADFS partitions.
*
* Params : hd - pointer to gendisk structure to store partition info.
* dev - device number to access.
* first_sector- first readable sector on the device.
* minor - first available minor on device.
*
* Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
*
* Alloc : hda = whole drive
* hda1 = ADFS partition on first drive.
* hda2 = non-ADFS partition.
*/
static int
adfspart_check_ADFS(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sector, int minor)
{
unsigned long start_sect, nr_sects, sectscyl, heads;
Sector sect;
unsigned char *data;
struct adfs_discrecord *dr;
unsigned char id;
data = read_dev_sector(bdev, 6, §);
if (!data)
return -1;
dr = adfs_partition(hd, "ADFS", data, first_sector, minor++);
if (!dr) {
put_dev_sector(sect);
return 0;
}
heads = dr->heads + ((dr->lowsector >> 6) & 1);
sectscyl = dr->secspertrack * heads;
start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;
id = data[0x1fc] & 15;
put_dev_sector(sect);
adfspart_setgeometry(to_kdev_t(bdev->bd_dev), dr->secspertrack, heads);
invalidate_bdev(bdev, 1);
truncate_inode_pages(bdev->bd_inode->i_mapping, 0);
/*
* Work out start of non-adfs partition.
*/
nr_sects = hd->part[MINOR(to_kdev_t(bdev->bd_dev))].nr_sects - start_sect;
if (start_sect) {
first_sector += start_sect;
switch (id) {
#ifdef CONFIG_ACORN_PARTITION_RISCIX
case PARTITION_RISCIX_SCSI:
case PARTITION_RISCIX_MFM:
minor = riscix_partition(hd, bdev, first_sector,
minor, nr_sects);
break;
#endif
case PARTITION_LINUX:
minor = linux_partition(hd, bdev, first_sector,
minor, nr_sects);
break;
}
}
return 1;
}
#endif
#ifdef CONFIG_ACORN_PARTITION_ICS
static int adfspart_check_ICSLinux(struct block_device *bdev, unsigned long block)
{
Sector sect;
unsigned char *data = read_dev_sector(bdev, block, §);
int result = 0;
if (data) {
if (memcmp(data, "LinuxPart", 9) == 0)
result = 1;
put_dev_sector(sect);
}
return result;
}
/*
* Purpose: allocate ICS partitions.
* Params : hd - pointer to gendisk structure to store partition info.
* dev - device number to access.
* first_sector- first readable sector on the device.
* minor - first available minor on device.
* Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
* Alloc : hda = whole drive
* hda1 = ADFS partition 0 on first drive.
* hda2 = ADFS partition 1 on first drive.
* ..etc..
*/
static int
adfspart_check_ICS(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sector, int minor)
{
Sector sect;
unsigned char *data;
unsigned long sum;
unsigned int i, mask = (1 << hd->minor_shift) - 1;
struct ics_part *p;
/*
* Try ICS style partitions - sector 0 contains partition info.
*/
data = read_dev_sector(bdev, 0, §);
if (!data)
return -1;
/*
* check for a valid checksum
*/
for (i = 0, sum = 0x50617274; i < 508; i++)
sum += data[i];
sum -= le32_to_cpu(*(__u32 *)(&data[508]));
if (sum) {
put_dev_sector(sect);
return 0; /* not ICS partition table */
}
printk(" [ICS]");
for (p = (struct ics_part *)data; p->size; p++) {
unsigned long start;
long size;
if ((minor & mask) == 0)
break;
start = le32_to_cpu(p->start);
size = le32_to_cpu(p->size);
if (size < 0) {
size = -size;
/*
* We use the first sector to identify what type
* this partition is...
*/
if (size > 1 && adfspart_check_ICSLinux(bdev, start)) {
start += 1;
size -= 1;
}
}
if (size) {
add_gd_partition(hd, minor, first_sector + start, size);
minor++;
}
}
put_dev_sector(sect);
return 1;
}
#endif
/*
* Purpose: allocate ICS partitions.
* Params : hd - pointer to gendisk structure to store partition info.
* dev - device number to access.
* first_sector- first readable sector on the device.
* minor - first available minor on device.
* Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
* Alloc : hda = whole drive
* hda1 = ADFS partition 0 on first drive.
* hda2 = ADFS partition 1 on first drive.
* ..etc..
*/
#ifdef CONFIG_ACORN_PARTITION_POWERTEC
static int
adfspart_check_POWERTEC(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sector, int minor)
{
Sector sect;
unsigned char *data;
struct ptec_partition *p;
unsigned char checksum;
int i;
data = read_dev_sector(bdev, 0, §);
if (!data)
return -1;
for (checksum = 0x2a, i = 0; i < 511; i++)
checksum += data[i];
if (checksum != data[511]) {
put_dev_sector(sect);
return 0;
}
printk(" [POWERTEC]");
for (i = 0, p = (struct ptec_partition *)data; i < 12; i++, p++) {
unsigned long start;
unsigned long size;
start = le32_to_cpu(p->start);
size = le32_to_cpu(p->size);
if (size)
add_gd_partition(hd, minor, first_sector + start,
size);
minor++;
}
put_dev_sector(sect);
return 1;
}
#endif
static int (*partfn[])(struct gendisk *, struct block_device *, unsigned long, int) = {
#ifdef CONFIG_ACORN_PARTITION_ICS
adfspart_check_ICS,
#endif
#ifdef CONFIG_ACORN_PARTITION_POWERTEC
adfspart_check_POWERTEC,
#endif
#ifdef CONFIG_ACORN_PARTITION_CUMANA
adfspart_check_CUMANA,
#endif
#ifdef CONFIG_ACORN_PARTITION_ADFS
adfspart_check_ADFS,
#endif
NULL
};
/*
* Purpose: initialise all the partitions on an ADFS drive.
* These may be other ADFS partitions or a Linux/RiscBSD/RISCiX
* partition.
*
* Params : hd - pointer to gendisk structure
* dev - device number to access
* first_sect - first available sector on the disk.
* first_minor - first available minor on this device.
*
* Returns: -1 on error, 0 if not ADFS format, 1 if ok.
*/
int acorn_partition(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sect, int first_minor)
{
int i;
for (i = 0; partfn[i]; i++) {
int r = partfn[i](hd, bdev, first_sect, first_minor);
if (r) {
if (r > 0)
printk("\n");
return r;
}
}
return 0;
}
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