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550 lines
12 KiB
550 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 1996-2000 Russell King. |
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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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/* |
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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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#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
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defined(CONFIG_ACORN_PARTITION_ADFS) |
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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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strlcat(state->pp_buf, " [", PAGE_SIZE); |
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strlcat(state->pp_buf, name, PAGE_SIZE); |
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strlcat(state->pp_buf, "]", PAGE_SIZE); |
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} |
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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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#endif |
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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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#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
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defined(CONFIG_ACORN_PARTITION_ADFS) |
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static int riscix_partition(struct parsed_partitions *state, |
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unsigned long first_sect, int slot, |
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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 = read_part_sector(state, first_sect, §); |
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if (!rr) |
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return -1; |
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strlcat(state->pp_buf, " [RISCiX]", PAGE_SIZE); |
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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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strlcat(state->pp_buf, " <", PAGE_SIZE); |
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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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strlcat(state->pp_buf, "(", PAGE_SIZE); |
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strlcat(state->pp_buf, rr->part[part].name, PAGE_SIZE); |
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strlcat(state->pp_buf, ")", PAGE_SIZE); |
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} |
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} |
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strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
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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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#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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#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
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defined(CONFIG_ACORN_PARTITION_ADFS) |
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static int linux_partition(struct parsed_partitions *state, |
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unsigned long first_sect, int slot, |
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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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strlcat(state->pp_buf, " [Linux]", PAGE_SIZE); |
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put_partition(state, slot++, first_sect, size); |
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linuxp = read_part_sector(state, first_sect, §); |
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if (!linuxp) |
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return -1; |
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strlcat(state->pp_buf, " <", PAGE_SIZE); |
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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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strlcat(state->pp_buf, " >", PAGE_SIZE); |
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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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#ifdef CONFIG_ACORN_PARTITION_CUMANA |
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int adfspart_check_CUMANA(struct parsed_partitions *state) |
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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_part_sector(state, 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, first_sector, slot, |
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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, first_sector, slot, |
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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 adfspart_check_ADFS(struct parsed_partitions *state) |
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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_part_sector(state, 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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/* |
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* Work out start of non-adfs partition. |
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*/ |
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nr_sects = get_capacity(state->disk) - 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, start_sect, slot, |
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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, start_sect, slot, |
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nr_sects); |
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break; |
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} |
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} |
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strlcat(state->pp_buf, "\n", PAGE_SIZE); |
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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 parsed_partitions *state, |
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unsigned long block) |
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{ |
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Sector sect; |
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unsigned char *data = read_part_sector(state, 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 adfspart_check_ICS(struct parsed_partitions *state) |
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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_part_sector(state, 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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strlcat(state->pp_buf, " [ICS]", PAGE_SIZE); |
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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(state, 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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strlcat(state->pp_buf, "\n", PAGE_SIZE); |
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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 adfspart_check_POWERTEC(struct parsed_partitions *state) |
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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_part_sector(state, 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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strlcat(state->pp_buf, " [POWERTEC]", PAGE_SIZE); |
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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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strlcat(state->pp_buf, "\n", PAGE_SIZE); |
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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 adfspart_check_EESOX(struct parsed_partitions *state) |
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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_part_sector(state, 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(state->disk); |
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put_partition(state, slot++, start, size - start); |
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strlcat(state->pp_buf, "\n", PAGE_SIZE); |
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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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