1 files changed, 556 insertions, 0 deletions

diff --git a/block/partitions/acorn.c b/block/partitions/acorn.c
new file mode 100644
index 000000000000..fbeb697374d5
--- /dev/null
+++ b/block/partitions/acorn.c
@@ -0,0 +1,556 @@
+/*
+ *  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.  Unfortunately, there
+ *  isn't a standard for partitioning drives on Acorn machines, so
+ *  every single manufacturer of SCSI and IDE cards created their own
+ *  method.
+ */
+#include <linux/buffer_head.h>
+#include <linux/adfs_fs.h>
+
+#include "check.h"
+#include "acorn.h"
+
+/*
+ * Partition types. (Oh for reusability)
+ */
+#define PARTITION_RISCIX_MFM    1
+#define PARTITION_RISCIX_SCSI   2
+#define PARTITION_LINUX         9
+
+#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
+        defined(CONFIG_ACORN_PARTITION_ADFS)
+static struct adfs_discrecord *
+adfs_partition(struct parsed_partitions *state, char *name, char *data,
+               unsigned long first_sector, int slot)
+{
+        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) {
+                strlcat(state->pp_buf, " [", PAGE_SIZE);
+                strlcat(state->pp_buf, name, PAGE_SIZE);
+                strlcat(state->pp_buf, "]", PAGE_SIZE);
+        }
+        put_partition(state, slot, first_sector, nr_sects);
+        return dr;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+
+struct riscix_part {
+        __le32  start;
+        __le32  length;
+        __le32  one;
+        char    name[16];
+};
+
+struct riscix_record {
+        __le32  magic;
+#define RISCIX_MAGIC    cpu_to_le32(0x4a657320)
+        __le32  date;
+        struct riscix_part part[8];
+};
+
+#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
+        defined(CONFIG_ACORN_PARTITION_ADFS)
+static int riscix_partition(struct parsed_partitions *state,
+                            unsigned long first_sect, int slot,
+                            unsigned long nr_sects)
+{
+        Sector sect;
+        struct riscix_record *rr;
+        
+        rr = read_part_sector(state, first_sect, &sect);
+        if (!rr)
+                return -1;
+
+        strlcat(state->pp_buf, " [RISCiX]", PAGE_SIZE);
+
+
+        if (rr->magic == RISCIX_MAGIC) {
+                unsigned long size = nr_sects > 2 ? 2 : nr_sects;
+                int part;
+
+                strlcat(state->pp_buf, " <", PAGE_SIZE);
+
+                put_partition(state, slot++, first_sect, size);
+                for (part = 0; part < 8; part++) {
+                        if (rr->part[part].one &&
+                            memcmp(rr->part[part].name, "All\0", 4)) {
+                                put_partition(state, slot++,
+                                        le32_to_cpu(rr->part[part].start),
+                                        le32_to_cpu(rr->part[part].length));
+                                strlcat(state->pp_buf, "(", PAGE_SIZE);
+                                strlcat(state->pp_buf, rr->part[part].name, PAGE_SIZE);
+                                strlcat(state->pp_buf, ")", PAGE_SIZE);
+                        }
+                }
+
+                strlcat(state->pp_buf, " >\n", PAGE_SIZE);
+        } else {
+                put_partition(state, slot++, first_sect, nr_sects);
+        }
+
+        put_dev_sector(sect);
+        return slot;
+}
+#endif
+#endif
+
+#define LINUX_NATIVE_MAGIC 0xdeafa1de
+#define LINUX_SWAP_MAGIC   0xdeafab1e
+
+struct linux_part {
+        __le32 magic;
+        __le32 start_sect;
+        __le32 nr_sects;
+};
+
+#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
+        defined(CONFIG_ACORN_PARTITION_ADFS)
+static int linux_partition(struct parsed_partitions *state,
+                           unsigned long first_sect, int slot,
+                           unsigned long nr_sects)
+{
+        Sector sect;
+        struct linux_part *linuxp;
+        unsigned long size = nr_sects > 2 ? 2 : nr_sects;
+
+        strlcat(state->pp_buf, " [Linux]", PAGE_SIZE);
+
+        put_partition(state, slot++, first_sect, size);
+
+        linuxp = read_part_sector(state, first_sect, &sect);
+        if (!linuxp)
+                return -1;
+
+        strlcat(state->pp_buf, " <", PAGE_SIZE);
+        while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
+               linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
+                if (slot == state->limit)
+                        break;
+                put_partition(state, slot++, first_sect +
+                                 le32_to_cpu(linuxp->start_sect),
+                                 le32_to_cpu(linuxp->nr_sects));
+                linuxp ++;
+        }
+        strlcat(state->pp_buf, " >", PAGE_SIZE);
+
+        put_dev_sector(sect);
+        return slot;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_CUMANA
+int adfspart_check_CUMANA(struct parsed_partitions *state)
+{
+        unsigned long first_sector = 0;
+        unsigned int start_blk = 0;
+        Sector sect;
+        unsigned char *data;
+        char *name = "CUMANA/ADFS";
+        int first = 1;
+        int slot = 1;
+
+        /*
+         * Try Cumana style partitions - sector 6 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;
+
+                data = read_part_sector(state, start_blk * 2 + 6, &sect);
+                if (!data)
+                        return -1;
+
+                if (slot == state->limit)
+                        break;
+
+                dr = adfs_partition(state, name, data, first_sector, slot++);
+                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. */
+                        slot = riscix_partition(state, first_sector, slot,
+                                                nr_sects);
+                        break;
+#endif
+
+                case PARTITION_LINUX:
+                        slot = linux_partition(state, first_sector, slot,
+                                               nr_sects);
+                        break;
+                }
+                put_dev_sector(sect);
+                if (slot == -1)
+                        return -1;
+        } 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.
+ *
+ * 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.
+ */
+int adfspart_check_ADFS(struct parsed_partitions *state)
+{
+        unsigned long start_sect, nr_sects, sectscyl, heads;
+        Sector sect;
+        unsigned char *data;
+        struct adfs_discrecord *dr;
+        unsigned char id;
+        int slot = 1;
+
+        data = read_part_sector(state, 6, &sect);
+        if (!data)
+                return -1;
+
+        dr = adfs_partition(state, "ADFS", data, 0, slot++);
+        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);
+
+        /*
+         * Work out start of non-adfs partition.
+         */
+        nr_sects = (state->bdev->bd_inode->i_size >> 9) - start_sect;
+
+        if (start_sect) {
+                switch (id) {
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+                case PARTITION_RISCIX_SCSI:
+                case PARTITION_RISCIX_MFM:
+                        slot = riscix_partition(state, start_sect, slot,
+                                                nr_sects);
+                        break;
+#endif
+
+                case PARTITION_LINUX:
+                        slot = linux_partition(state, start_sect, slot,
+                                               nr_sects);
+                        break;
+                }
+        }
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_ICS
+
+struct ics_part {
+        __le32 start;
+        __le32 size;
+};
+
+static int adfspart_check_ICSLinux(struct parsed_partitions *state,
+                                   unsigned long block)
+{
+        Sector sect;
+        unsigned char *data = read_part_sector(state, block, &sect);
+        int result = 0;
+
+        if (data) {
+                if (memcmp(data, "LinuxPart", 9) == 0)
+                        result = 1;
+                put_dev_sector(sect);
+        }
+
+        return result;
+}
+
+/*
+ * Check for a valid ICS partition using the checksum.
+ */
+static inline int valid_ics_sector(const unsigned char *data)
+{
+        unsigned long sum;
+        int i;
+
+        for (i = 0, sum = 0x50617274; i < 508; i++)
+                sum += data[i];
+
+        sum -= le32_to_cpu(*(__le32 *)(&data[508]));
+
+        return sum == 0;
+}
+
+/*
+ * Purpose: allocate ICS partitions.
+ * Params : hd          - pointer to gendisk structure to store partition info.
+ *          dev         - device number to access.
+ * 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..
+ */
+int adfspart_check_ICS(struct parsed_partitions *state)
+{
+        const unsigned char *data;
+        const struct ics_part *p;
+        int slot;
+        Sector sect;
+
+        /*
+         * Try ICS style partitions - sector 0 contains partition info.
+         */
+        data = read_part_sector(state, 0, &sect);
+        if (!data)
+                return -1;
+
+        if (!valid_ics_sector(data)) {
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        strlcat(state->pp_buf, " [ICS]", PAGE_SIZE);
+
+        for (slot = 1, p = (const struct ics_part *)data; p->size; p++) {
+                u32 start = le32_to_cpu(p->start);
+                s32 size = le32_to_cpu(p->size); /* yes, it's signed. */
+
+                if (slot == state->limit)
+                        break;
+
+                /*
+                 * Negative sizes tell the RISC OS ICS driver to ignore
+                 * this partition - in effect it says that this does not
+                 * contain an ADFS filesystem.
+                 */
+                if (size < 0) {
+                        size = -size;
+
+                        /*
+                         * Our own extension - We use the first sector
+                         * of the partition to identify what type this
+                         * partition is.  We must not make this visible
+                         * to the filesystem.
+                         */
+                        if (size > 1 && adfspart_check_ICSLinux(state, start)) {
+                                start += 1;
+                                size -= 1;
+                        }
+                }
+
+                if (size)
+                        put_partition(state, slot++, start, size);
+        }
+
+        put_dev_sector(sect);
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_POWERTEC
+struct ptec_part {
+        __le32 unused1;
+        __le32 unused2;
+        __le32 start;
+        __le32 size;
+        __le32 unused5;
+        char type[8];
+};
+
+static inline int valid_ptec_sector(const unsigned char *data)
+{
+        unsigned char checksum = 0x2a;
+        int i;
+
+        /*
+         * If it looks like a PC/BIOS partition, then it
+         * probably isn't PowerTec.
+         */
+        if (data[510] == 0x55 && data[511] == 0xaa)
+                return 0;
+
+        for (i = 0; i < 511; i++)
+                checksum += data[i];
+
+        return checksum == data[511];
+}
+
+/*
+ * Purpose: allocate ICS partitions.
+ * Params : hd          - pointer to gendisk structure to store partition info.
+ *          dev         - device number to access.
+ * 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..
+ */
+int adfspart_check_POWERTEC(struct parsed_partitions *state)
+{
+        Sector sect;
+        const unsigned char *data;
+        const struct ptec_part *p;
+        int slot = 1;
+        int i;
+
+        data = read_part_sector(state, 0, &sect);
+        if (!data)
+                return -1;
+
+        if (!valid_ptec_sector(data)) {
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        strlcat(state->pp_buf, " [POWERTEC]", PAGE_SIZE);
+
+        for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) {
+                u32 start = le32_to_cpu(p->start);
+                u32 size = le32_to_cpu(p->size);
+
+                if (size)
+                        put_partition(state, slot++, start, size);
+        }
+
+        put_dev_sector(sect);
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_EESOX
+struct eesox_part {
+        char    magic[6];
+        char    name[10];
+        __le32  start;
+        __le32  unused6;
+        __le32  unused7;
+        __le32  unused8;
+};
+
+/*
+ * Guess who created this format?
+ */
+static const char eesox_name[] = {
+        'N', 'e', 'i', 'l', ' ',
+        'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' '
+};
+
+/*
+ * EESOX SCSI partition format.
+ *
+ * This is a goddamned awful partition format.  We don't seem to store
+ * the size of the partition in this table, only the start addresses.
+ *
+ * There are two possibilities where the size comes from:
+ *  1. The individual ADFS boot block entries that are placed on the disk.
+ *  2. The start address of the next entry.
+ */
+int adfspart_check_EESOX(struct parsed_partitions *state)
+{
+        Sector sect;
+        const unsigned char *data;
+        unsigned char buffer[256];
+        struct eesox_part *p;
+        sector_t start = 0;
+        int i, slot = 1;
+
+        data = read_part_sector(state, 7, &sect);
+        if (!data)
+                return -1;
+
+        /*
+         * "Decrypt" the partition table.  God knows why...
+         */
+        for (i = 0; i < 256; i++)
+                buffer[i] = data[i] ^ eesox_name[i & 15];
+
+        put_dev_sector(sect);
+
+        for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) {
+                sector_t next;
+
+                if (memcmp(p->magic, "Eesox", 6))
+                        break;
+
+                next = le32_to_cpu(p->start);
+                if (i)
+                        put_partition(state, slot++, start, next - start);
+                start = next;
+        }
+
+        if (i != 0) {
+                sector_t size;
+
+                size = get_capacity(state->bdev->bd_disk);
+                put_partition(state, slot++, start, size - start);
+                strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        }
+
+        return i ? 1 : 0;
+}
+#endif