mirror of https://gitee.com/openkylin/linux.git
557 lines
12 KiB
C
557 lines
12 KiB
C
/*
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* linux/fs/partitions/acorn.c
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*
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* Copyright (c) 1996-2000 Russell King.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Scan ADFS partitions on hard disk drives. Unfortunately, there
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* isn't a standard for partitioning drives on Acorn machines, so
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* every single manufacturer of SCSI and IDE cards created their own
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* method.
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*/
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#include <linux/buffer_head.h>
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#include <linux/adfs_fs.h>
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#include "check.h"
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#include "acorn.h"
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/*
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* Partition types. (Oh for reusability)
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*/
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#define PARTITION_RISCIX_MFM 1
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#define PARTITION_RISCIX_SCSI 2
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#define PARTITION_LINUX 9
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static struct adfs_discrecord *
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adfs_partition(struct parsed_partitions *state, char *name, char *data,
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unsigned long first_sector, int slot)
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{
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struct adfs_discrecord *dr;
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unsigned int nr_sects;
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if (adfs_checkbblk(data))
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return NULL;
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dr = (struct adfs_discrecord *)(data + 0x1c0);
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if (dr->disc_size == 0 && dr->disc_size_high == 0)
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return NULL;
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nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) |
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(le32_to_cpu(dr->disc_size) >> 9);
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if (name)
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printk(" [%s]", name);
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put_partition(state, slot, first_sector, nr_sects);
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return dr;
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}
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#ifdef CONFIG_ACORN_PARTITION_RISCIX
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struct riscix_part {
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__le32 start;
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__le32 length;
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__le32 one;
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char name[16];
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};
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struct riscix_record {
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__le32 magic;
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#define RISCIX_MAGIC cpu_to_le32(0x4a657320)
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__le32 date;
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struct riscix_part part[8];
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};
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static int
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riscix_partition(struct parsed_partitions *state, struct block_device *bdev,
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unsigned long first_sect, int slot, unsigned long nr_sects)
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{
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Sector sect;
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struct riscix_record *rr;
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rr = (struct riscix_record *)read_dev_sector(bdev, first_sect, §);
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if (!rr)
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return -1;
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printk(" [RISCiX]");
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if (rr->magic == RISCIX_MAGIC) {
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unsigned long size = nr_sects > 2 ? 2 : nr_sects;
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int part;
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printk(" <");
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put_partition(state, slot++, first_sect, size);
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for (part = 0; part < 8; part++) {
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if (rr->part[part].one &&
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memcmp(rr->part[part].name, "All\0", 4)) {
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put_partition(state, slot++,
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le32_to_cpu(rr->part[part].start),
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le32_to_cpu(rr->part[part].length));
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printk("(%s)", rr->part[part].name);
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}
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}
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printk(" >\n");
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} else {
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put_partition(state, slot++, first_sect, nr_sects);
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}
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put_dev_sector(sect);
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return slot;
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}
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#endif
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#define LINUX_NATIVE_MAGIC 0xdeafa1de
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#define LINUX_SWAP_MAGIC 0xdeafab1e
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struct linux_part {
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__le32 magic;
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__le32 start_sect;
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__le32 nr_sects;
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};
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static int
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linux_partition(struct parsed_partitions *state, struct block_device *bdev,
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unsigned long first_sect, int slot, unsigned long nr_sects)
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{
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Sector sect;
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struct linux_part *linuxp;
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unsigned long size = nr_sects > 2 ? 2 : nr_sects;
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printk(" [Linux]");
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put_partition(state, slot++, first_sect, size);
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linuxp = (struct linux_part *)read_dev_sector(bdev, first_sect, §);
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if (!linuxp)
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return -1;
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printk(" <");
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while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
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linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
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if (slot == state->limit)
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break;
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put_partition(state, slot++, first_sect +
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le32_to_cpu(linuxp->start_sect),
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le32_to_cpu(linuxp->nr_sects));
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linuxp ++;
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}
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printk(" >");
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put_dev_sector(sect);
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return slot;
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}
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#ifdef CONFIG_ACORN_PARTITION_CUMANA
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int
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adfspart_check_CUMANA(struct parsed_partitions *state, struct block_device *bdev)
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{
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unsigned long first_sector = 0;
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unsigned int start_blk = 0;
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Sector sect;
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unsigned char *data;
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char *name = "CUMANA/ADFS";
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int first = 1;
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int slot = 1;
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/*
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* Try Cumana style partitions - sector 6 contains ADFS boot block
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* with pointer to next 'drive'.
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*
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* There are unknowns in this code - is the 'cylinder number' of the
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* next partition relative to the start of this one - I'm assuming
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* it is.
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*
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* Also, which ID did Cumana use?
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*
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* This is totally unfinished, and will require more work to get it
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* going. Hence it is totally untested.
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*/
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do {
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struct adfs_discrecord *dr;
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unsigned int nr_sects;
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data = read_dev_sector(bdev, start_blk * 2 + 6, §);
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if (!data)
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return -1;
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if (slot == state->limit)
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break;
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dr = adfs_partition(state, name, data, first_sector, slot++);
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if (!dr)
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break;
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name = NULL;
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nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *
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(dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *
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dr->secspertrack;
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if (!nr_sects)
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break;
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first = 0;
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first_sector += nr_sects;
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start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
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nr_sects = 0; /* hmm - should be partition size */
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switch (data[0x1fc] & 15) {
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case 0: /* No partition / ADFS? */
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break;
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#ifdef CONFIG_ACORN_PARTITION_RISCIX
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case PARTITION_RISCIX_SCSI:
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/* RISCiX - we don't know how to find the next one. */
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slot = riscix_partition(state, bdev, first_sector,
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slot, nr_sects);
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break;
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#endif
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case PARTITION_LINUX:
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slot = linux_partition(state, bdev, first_sector,
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slot, nr_sects);
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break;
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}
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put_dev_sector(sect);
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if (slot == -1)
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return -1;
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} while (1);
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put_dev_sector(sect);
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return first ? 0 : 1;
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}
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#endif
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#ifdef CONFIG_ACORN_PARTITION_ADFS
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/*
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* Purpose: allocate ADFS partitions.
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*
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* Params : hd - pointer to gendisk structure to store partition info.
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* dev - device number to access.
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*
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* Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
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*
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* Alloc : hda = whole drive
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* hda1 = ADFS partition on first drive.
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* hda2 = non-ADFS partition.
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*/
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int
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adfspart_check_ADFS(struct parsed_partitions *state, struct block_device *bdev)
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{
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unsigned long start_sect, nr_sects, sectscyl, heads;
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Sector sect;
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unsigned char *data;
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struct adfs_discrecord *dr;
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unsigned char id;
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int slot = 1;
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data = read_dev_sector(bdev, 6, §);
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if (!data)
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return -1;
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dr = adfs_partition(state, "ADFS", data, 0, slot++);
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if (!dr) {
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put_dev_sector(sect);
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return 0;
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}
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heads = dr->heads + ((dr->lowsector >> 6) & 1);
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sectscyl = dr->secspertrack * heads;
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start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;
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id = data[0x1fc] & 15;
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put_dev_sector(sect);
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#ifdef CONFIG_BLK_DEV_MFM
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if (MAJOR(bdev->bd_dev) == MFM_ACORN_MAJOR) {
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extern void xd_set_geometry(struct block_device *,
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unsigned char, unsigned char, unsigned int);
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xd_set_geometry(bdev, dr->secspertrack, heads, 1);
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invalidate_bh_lrus();
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truncate_inode_pages(bdev->bd_inode->i_mapping, 0);
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}
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#endif
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/*
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* Work out start of non-adfs partition.
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*/
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nr_sects = (bdev->bd_inode->i_size >> 9) - start_sect;
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if (start_sect) {
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switch (id) {
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#ifdef CONFIG_ACORN_PARTITION_RISCIX
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case PARTITION_RISCIX_SCSI:
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case PARTITION_RISCIX_MFM:
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slot = riscix_partition(state, bdev, start_sect,
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slot, nr_sects);
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break;
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#endif
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case PARTITION_LINUX:
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slot = linux_partition(state, bdev, start_sect,
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slot, nr_sects);
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break;
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}
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}
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printk("\n");
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return 1;
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}
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#endif
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#ifdef CONFIG_ACORN_PARTITION_ICS
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struct ics_part {
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__le32 start;
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__le32 size;
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};
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static int adfspart_check_ICSLinux(struct block_device *bdev, unsigned long block)
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{
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Sector sect;
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unsigned char *data = read_dev_sector(bdev, block, §);
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int result = 0;
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if (data) {
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if (memcmp(data, "LinuxPart", 9) == 0)
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result = 1;
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put_dev_sector(sect);
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}
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return result;
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}
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/*
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* Check for a valid ICS partition using the checksum.
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*/
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static inline int valid_ics_sector(const unsigned char *data)
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{
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unsigned long sum;
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int i;
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for (i = 0, sum = 0x50617274; i < 508; i++)
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sum += data[i];
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sum -= le32_to_cpu(*(__le32 *)(&data[508]));
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return sum == 0;
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}
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/*
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* Purpose: allocate ICS partitions.
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* Params : hd - pointer to gendisk structure to store partition info.
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* dev - device number to access.
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* Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
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* Alloc : hda = whole drive
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* hda1 = ADFS partition 0 on first drive.
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* hda2 = ADFS partition 1 on first drive.
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* ..etc..
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*/
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int
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adfspart_check_ICS(struct parsed_partitions *state, struct block_device *bdev)
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{
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const unsigned char *data;
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const struct ics_part *p;
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int slot;
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Sector sect;
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/*
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* Try ICS style partitions - sector 0 contains partition info.
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*/
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data = read_dev_sector(bdev, 0, §);
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if (!data)
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return -1;
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if (!valid_ics_sector(data)) {
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put_dev_sector(sect);
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return 0;
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}
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printk(" [ICS]");
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for (slot = 1, p = (const struct ics_part *)data; p->size; p++) {
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u32 start = le32_to_cpu(p->start);
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s32 size = le32_to_cpu(p->size); /* yes, it's signed. */
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if (slot == state->limit)
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break;
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/*
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* Negative sizes tell the RISC OS ICS driver to ignore
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* this partition - in effect it says that this does not
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* contain an ADFS filesystem.
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*/
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if (size < 0) {
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size = -size;
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/*
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* Our own extension - We use the first sector
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* of the partition to identify what type this
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* partition is. We must not make this visible
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* to the filesystem.
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*/
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if (size > 1 && adfspart_check_ICSLinux(bdev, start)) {
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start += 1;
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size -= 1;
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}
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}
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if (size)
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put_partition(state, slot++, start, size);
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}
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put_dev_sector(sect);
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printk("\n");
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return 1;
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}
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#endif
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#ifdef CONFIG_ACORN_PARTITION_POWERTEC
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struct ptec_part {
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__le32 unused1;
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__le32 unused2;
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__le32 start;
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__le32 size;
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__le32 unused5;
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char type[8];
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};
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static inline int valid_ptec_sector(const unsigned char *data)
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{
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unsigned char checksum = 0x2a;
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int i;
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/*
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* If it looks like a PC/BIOS partition, then it
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* probably isn't PowerTec.
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*/
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if (data[510] == 0x55 && data[511] == 0xaa)
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return 0;
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for (i = 0; i < 511; i++)
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checksum += data[i];
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return checksum == data[511];
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}
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/*
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* Purpose: allocate ICS partitions.
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* Params : hd - pointer to gendisk structure to store partition info.
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* dev - device number to access.
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* Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
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* Alloc : hda = whole drive
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* hda1 = ADFS partition 0 on first drive.
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* hda2 = ADFS partition 1 on first drive.
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* ..etc..
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*/
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int
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adfspart_check_POWERTEC(struct parsed_partitions *state, struct block_device *bdev)
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{
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Sector sect;
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const unsigned char *data;
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const struct ptec_part *p;
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int slot = 1;
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int i;
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data = read_dev_sector(bdev, 0, §);
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if (!data)
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return -1;
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if (!valid_ptec_sector(data)) {
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put_dev_sector(sect);
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return 0;
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}
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printk(" [POWERTEC]");
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for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) {
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u32 start = le32_to_cpu(p->start);
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u32 size = le32_to_cpu(p->size);
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if (size)
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put_partition(state, slot++, start, size);
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}
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put_dev_sector(sect);
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printk("\n");
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return 1;
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}
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#endif
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#ifdef CONFIG_ACORN_PARTITION_EESOX
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struct eesox_part {
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char magic[6];
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char name[10];
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__le32 start;
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__le32 unused6;
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__le32 unused7;
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__le32 unused8;
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};
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/*
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* Guess who created this format?
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*/
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static const char eesox_name[] = {
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'N', 'e', 'i', 'l', ' ',
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'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' '
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};
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/*
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* EESOX SCSI partition format.
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*
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* This is a goddamned awful partition format. We don't seem to store
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* the size of the partition in this table, only the start addresses.
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*
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* There are two possibilities where the size comes from:
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* 1. The individual ADFS boot block entries that are placed on the disk.
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* 2. The start address of the next entry.
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*/
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int
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adfspart_check_EESOX(struct parsed_partitions *state, struct block_device *bdev)
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{
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Sector sect;
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const unsigned char *data;
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unsigned char buffer[256];
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struct eesox_part *p;
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sector_t start = 0;
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int i, slot = 1;
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data = read_dev_sector(bdev, 7, §);
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if (!data)
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return -1;
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/*
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* "Decrypt" the partition table. God knows why...
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*/
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for (i = 0; i < 256; i++)
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buffer[i] = data[i] ^ eesox_name[i & 15];
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put_dev_sector(sect);
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for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) {
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sector_t next;
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if (memcmp(p->magic, "Eesox", 6))
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break;
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next = le32_to_cpu(p->start);
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if (i)
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put_partition(state, slot++, start, next - start);
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start = next;
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}
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if (i != 0) {
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sector_t size;
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size = get_capacity(bdev->bd_disk);
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put_partition(state, slot++, start, size - start);
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printk("\n");
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}
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return i ? 1 : 0;
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}
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#endif
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