Rev 3509 | Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3264 | decky | 1 | #!/usr/bin/env python |
| 2 | # |
||
| 3 | # Copyright (c) 2008 Martin Decky |
||
| 4 | # All rights reserved. |
||
| 5 | # |
||
| 6 | # Redistribution and use in source and binary forms, with or without |
||
| 7 | # modification, are permitted provided that the following conditions |
||
| 8 | # are met: |
||
| 9 | # |
||
| 10 | # - Redistributions of source code must retain the above copyright |
||
| 11 | # notice, this list of conditions and the following disclaimer. |
||
| 12 | # - Redistributions in binary form must reproduce the above copyright |
||
| 13 | # notice, this list of conditions and the following disclaimer in the |
||
| 14 | # documentation and/or other materials provided with the distribution. |
||
| 15 | # - The name of the author may not be used to endorse or promote products |
||
| 16 | # derived from this software without specific prior written permission. |
||
| 17 | # |
||
| 18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 28 | # |
||
| 29 | """ |
||
| 30 | FAT creator |
||
| 31 | """ |
||
| 32 | |||
| 33 | import sys |
||
| 34 | import os |
||
| 35 | import random |
||
| 36 | import xstruct |
||
| 37 | |||
| 38 | BOOT_SECTOR = """little: |
||
| 39 | uint8_t jmp[3] /* jump instruction */ |
||
| 40 | char oem[8] /* OEM string */ |
||
| 41 | uint16_t sector /* bytes per sector */ |
||
| 42 | uint8_t cluster /* sectors per cluster */ |
||
| 43 | uint16_t reserved /* reserved sectors */ |
||
| 44 | uint8_t fats /* number of FATs */ |
||
| 45 | uint16_t rootdir /* root directory entries */ |
||
| 46 | uint16_t sectors /* total number of sectors */ |
||
| 47 | uint8_t descriptor /* media descriptor */ |
||
| 48 | uint16_t fat_sectors /* sectors per single FAT */ |
||
| 49 | uint16_t track_sectors /* sectors per track */ |
||
| 50 | uint16_t heads /* number of heads */ |
||
| 51 | uint32_t hidden /* hidden sectors */ |
||
| 52 | uint32_t sectors_big /* total number of sectors (if sectors == 0) */ |
||
| 53 | |||
| 54 | /* Extended BIOS Parameter Block */ |
||
| 55 | uint8_t drive /* physical drive number */ |
||
| 56 | padding[1] /* reserved (current head) */ |
||
| 57 | uint8_t extboot_signature /* extended boot signature */ |
||
| 58 | uint32_t serial /* serial number */ |
||
| 59 | char label[11] /* volume label */ |
||
| 60 | char fstype[8] /* filesystem type */ |
||
| 61 | padding[448] /* boot code */ |
||
| 62 | uint8_t boot_signature[2] /* boot signature */ |
||
| 63 | """ |
||
| 64 | |||
| 65 | def usage(prname): |
||
| 66 | "Print usage syntax" |
||
| 67 | print prname + " <PATH> <IMAGE>" |
||
| 68 | |||
| 69 | def main(): |
||
| 70 | if (len(sys.argv) < 3): |
||
| 71 | usage(sys.argv[0]) |
||
| 72 | return |
||
| 73 | |||
| 74 | path = os.path.abspath(sys.argv[1]) |
||
| 75 | if (not os.path.isdir(path)): |
||
| 76 | print "<PATH> must be a directory" |
||
| 77 | return |
||
| 78 | |||
| 79 | outf = file(sys.argv[2], "w") |
||
| 80 | |||
| 81 | boot_sector = xstruct.create(BOOT_SECTOR) |
||
| 82 | boot_sector.jmp = [0xEB, 0x3C, 0x90] |
||
| 83 | boot_sector.oem = "MSDOS5.0" |
||
| 84 | boot_sector.sector = 512 |
||
| 85 | boot_sector.cluster = 8 # 4096 bytes per cluster |
||
| 86 | boot_sector.reserved = 1 |
||
| 87 | boot_sector.fats = 2 |
||
| 88 | boot_sector.rootdir = 224 # FIXME: root directory should be sector aligned |
||
| 89 | boot_sector.sectors = 0 # FIXME |
||
| 90 | boot_sector.descriptor = 0xF8 |
||
| 91 | boot_sector.fat_sectors = 0 # FIXME |
||
| 92 | boot_sector.track_sectors = 0 # FIXME |
||
| 93 | boot_sector.heads = 0 # FIXME |
||
| 94 | boot_sector.hidden = 0 |
||
| 95 | boot_sector.sectors_big = 0 # FIXME |
||
| 96 | |||
| 97 | boot_sector.drive = 0 |
||
| 98 | boot_sector.extboot_signature = 0x29 |
||
| 99 | boot_sector.serial = random.randint(0, 0xFFFFFFFF) |
||
| 100 | boot_sector.label = "HELENOS" |
||
| 101 | boot_sector.fstype = "FAT16 " |
||
| 102 | boot_sector.boot_signature = [0x55, 0xAA] |
||
| 103 | |||
| 104 | outf.write(boot_sector.pack()) |
||
| 105 | |||
| 106 | outf.close() |
||
| 107 | |||
| 108 | if __name__ == '__main__': |
||
| 109 | main() |