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| Rev | Author | Line No. | Line |
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| 3264 | decky | 1 | #!/usr/bin/env python |
| 2 | # |
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| 3 | # Copyright (c) 2008 Martin Decky |
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| 4 | # All rights reserved. |
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| 5 | # |
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| 6 | # Redistribution and use in source and binary forms, with or without |
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| 7 | # modification, are permitted provided that the following conditions |
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| 8 | # are met: |
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| 9 | # |
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| 10 | # - Redistributions of source code must retain the above copyright |
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| 11 | # notice, this list of conditions and the following disclaimer. |
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| 12 | # - Redistributions in binary form must reproduce the above copyright |
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| 13 | # notice, this list of conditions and the following disclaimer in the |
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| 14 | # documentation and/or other materials provided with the distribution. |
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| 15 | # - The name of the author may not be used to endorse or promote products |
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| 16 | # derived from this software without specific prior written permission. |
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| 17 | # |
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| 18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 28 | # |
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| 29 | """ |
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| 30 | FAT creator |
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| 31 | """ |
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| 32 | |||
| 33 | import sys |
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| 34 | import os |
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| 35 | import random |
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| 36 | import xstruct |
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| 37 | |||
| 38 | BOOT_SECTOR = """little: |
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| 39 | uint8_t jmp[3] /* jump instruction */ |
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| 40 | char oem[8] /* OEM string */ |
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| 41 | uint16_t sector /* bytes per sector */ |
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| 42 | uint8_t cluster /* sectors per cluster */ |
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| 43 | uint16_t reserved /* reserved sectors */ |
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| 44 | uint8_t fats /* number of FATs */ |
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| 45 | uint16_t rootdir /* root directory entries */ |
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| 46 | uint16_t sectors /* total number of sectors */ |
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| 47 | uint8_t descriptor /* media descriptor */ |
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| 48 | uint16_t fat_sectors /* sectors per single FAT */ |
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| 49 | uint16_t track_sectors /* sectors per track */ |
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| 50 | uint16_t heads /* number of heads */ |
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| 51 | uint32_t hidden /* hidden sectors */ |
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| 52 | uint32_t sectors_big /* total number of sectors (if sectors == 0) */ |
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| 53 | |||
| 54 | /* Extended BIOS Parameter Block */ |
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| 55 | uint8_t drive /* physical drive number */ |
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| 56 | padding[1] /* reserved (current head) */ |
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| 57 | uint8_t extboot_signature /* extended boot signature */ |
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| 58 | uint32_t serial /* serial number */ |
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| 59 | char label[11] /* volume label */ |
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| 60 | char fstype[8] /* filesystem type */ |
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| 61 | padding[448] /* boot code */ |
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| 62 | uint8_t boot_signature[2] /* boot signature */ |
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| 63 | """ |
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| 64 | |||
| 65 | def usage(prname): |
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| 66 | "Print usage syntax" |
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| 67 | print prname + " <PATH> <IMAGE>" |
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| 68 | |||
| 69 | def main(): |
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| 70 | if (len(sys.argv) < 3): |
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| 71 | usage(sys.argv[0]) |
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| 72 | return |
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| 73 | |||
| 74 | path = os.path.abspath(sys.argv[1]) |
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| 75 | if (not os.path.isdir(path)): |
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| 76 | print "<PATH> must be a directory" |
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| 77 | return |
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| 78 | |||
| 79 | outf = file(sys.argv[2], "w") |
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| 80 | |||
| 81 | boot_sector = xstruct.create(BOOT_SECTOR) |
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| 82 | boot_sector.jmp = [0xEB, 0x3C, 0x90] |
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| 83 | boot_sector.oem = "MSDOS5.0" |
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| 84 | boot_sector.sector = 512 |
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| 85 | boot_sector.cluster = 8 # 4096 bytes per cluster |
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| 86 | boot_sector.reserved = 1 |
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| 87 | boot_sector.fats = 2 |
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| 88 | boot_sector.rootdir = 224 # FIXME: root directory should be sector aligned |
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| 89 | boot_sector.sectors = 0 # FIXME |
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| 90 | boot_sector.descriptor = 0xF8 |
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| 91 | boot_sector.fat_sectors = 0 # FIXME |
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| 92 | boot_sector.track_sectors = 0 # FIXME |
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| 93 | boot_sector.heads = 0 # FIXME |
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| 94 | boot_sector.hidden = 0 |
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| 95 | boot_sector.sectors_big = 0 # FIXME |
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| 96 | |||
| 97 | boot_sector.drive = 0 |
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| 98 | boot_sector.extboot_signature = 0x29 |
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| 99 | boot_sector.serial = random.randint(0, 0xFFFFFFFF) |
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| 100 | boot_sector.label = "HELENOS" |
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| 101 | boot_sector.fstype = "FAT16 " |
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| 102 | boot_sector.boot_signature = [0x55, 0xAA] |
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| 103 | |||
| 104 | outf.write(boot_sector.pack()) |
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| 105 | |||
| 106 | outf.close() |
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| 107 | |||
| 108 | if __name__ == '__main__': |
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| 109 | main() |