OpenWrt – Blame information for rev 3
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Rev | Author | Line No. | Line |
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1 | office | 1 | /* |
2 | * Copyright (C) 2012 John Crispin <blogic@openwrt.org> |
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3 | * Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com> |
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4 | * |
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5 | * This program is free software; you can redistribute it and/or modify it |
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6 | * under the terms of the GNU General Public License version 2 as published |
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7 | * by the Free Software Foundation. |
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8 | * |
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9 | */ |
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10 | |||
11 | #include <linux/module.h> |
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12 | #include <linux/init.h> |
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13 | #include <linux/kernel.h> |
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14 | #include <linux/slab.h> |
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15 | #include <linux/mtd/mtd.h> |
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16 | #include <linux/mtd/partitions.h> |
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17 | #include <linux/byteorder/generic.h> |
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18 | |||
19 | #include "mtdsplit.h" |
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20 | |||
21 | #define EVA_NR_PARTS 2 |
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22 | #define EVA_MAGIC 0xfeed1281 |
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23 | #define EVA_FOOTER_SIZE 0x18 |
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24 | #define EVA_DUMMY_SQUASHFS_SIZE 0x100 |
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25 | |||
26 | struct eva_image_header { |
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27 | uint32_t magic; |
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28 | uint32_t size; |
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29 | }; |
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30 | |||
31 | static int mtdsplit_parse_eva(struct mtd_info *master, |
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32 | const struct mtd_partition **pparts, |
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33 | struct mtd_part_parser_data *data) |
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34 | { |
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35 | struct mtd_partition *parts; |
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36 | struct eva_image_header hdr; |
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37 | size_t retlen; |
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38 | unsigned long kernel_size, rootfs_offset; |
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39 | int err; |
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40 | |||
41 | err = mtd_read(master, 0, sizeof(hdr), &retlen, (void *) &hdr); |
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42 | if (err) |
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43 | return err; |
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44 | |||
45 | if (retlen != sizeof(hdr)) |
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46 | return -EIO; |
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47 | |||
48 | if (le32_to_cpu(hdr.magic) != EVA_MAGIC) |
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49 | return -EINVAL; |
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50 | |||
51 | kernel_size = le32_to_cpu(hdr.size) + EVA_FOOTER_SIZE; |
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52 | |||
53 | /* rootfs starts at the next 0x10000 boundary: */ |
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54 | rootfs_offset = round_up(kernel_size, 0x10000); |
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55 | |||
56 | /* skip the dummy EVA squashfs partition (with wrong endianness): */ |
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57 | rootfs_offset += EVA_DUMMY_SQUASHFS_SIZE; |
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58 | |||
59 | if (rootfs_offset >= master->size) |
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60 | return -EINVAL; |
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61 | |||
62 | err = mtd_check_rootfs_magic(master, rootfs_offset, NULL); |
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63 | if (err) |
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64 | return err; |
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65 | |||
66 | parts = kzalloc(EVA_NR_PARTS * sizeof(*parts), GFP_KERNEL); |
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67 | if (!parts) |
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68 | return -ENOMEM; |
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69 | |||
70 | parts[0].name = KERNEL_PART_NAME; |
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71 | parts[0].offset = 0; |
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72 | parts[0].size = kernel_size; |
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73 | |||
74 | parts[1].name = ROOTFS_PART_NAME; |
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75 | parts[1].offset = rootfs_offset; |
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76 | parts[1].size = master->size - rootfs_offset; |
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77 | |||
78 | *pparts = parts; |
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79 | return EVA_NR_PARTS; |
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80 | } |
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81 | |||
82 | static struct mtd_part_parser mtdsplit_eva_parser = { |
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83 | .owner = THIS_MODULE, |
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84 | .name = "eva-fw", |
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85 | .parse_fn = mtdsplit_parse_eva, |
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86 | .type = MTD_PARSER_TYPE_FIRMWARE, |
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87 | }; |
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88 | |||
89 | static int __init mtdsplit_eva_init(void) |
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90 | { |
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91 | register_mtd_parser(&mtdsplit_eva_parser); |
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92 | |||
93 | return 0; |
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94 | } |
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95 | |||
96 | subsys_initcall(mtdsplit_eva_init); |