212 lines
6.7 KiB
Python
Executable File
212 lines
6.7 KiB
Python
Executable File
#!/usr/bin/env python3
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#============================================================================
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#
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#/** @file qgpt.py
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#
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# GENERAL DESCRIPTION
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# Generates QCom GPT header for wrapping Bootblock
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#
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# Copyright (c) 2018, The Linux Foundation. All rights reserved.
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#
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# SPDX-License-Identifier: BSD-3-Clause
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#**/
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#
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import os
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import math
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import random
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import re
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import struct
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import sys
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import tempfile
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from binascii import crc32
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from optparse import OptionParser
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from types import *
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def UpdateMBR(options, GPTBlobBuffer):
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i = 0x1BE
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GPTBlobBuffer[i + 0] = 0x00 # not bootable
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GPTBlobBuffer[i + 1] = 0x00 # head
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GPTBlobBuffer[i + 2] = 0x01 # sector
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GPTBlobBuffer[i + 3] = 0x00 # cylinder
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GPTBlobBuffer[i + 4] = 0xEE # type
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GPTBlobBuffer[i + 5] = 0xFF # head
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GPTBlobBuffer[i + 6] = 0xFF # sector
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GPTBlobBuffer[i + 7] = 0xFF # cylinder
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GPTBlobBuffer[i + 8:i + 8 + 4] = [0x01, 0x00, 0x00, 0x00]
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GPTBlobBuffer[i + 12:i + 16] = [0x00, 0x0f, 0x00, 0x00]
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# magic byte for MBR partitioning - always at this location regardless of
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# options.sector
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GPTBlobBuffer[510:512] = [0x55, 0xAA]
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return i
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def UpdatePartitionEntry(options, GPTBlobBuffer):
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i = 2 * options.sector_size
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# GUID of Boot Block
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GPTBlobBuffer[i:i + 16] = [0x2c, 0xba, 0xa0, 0xde, 0xdd, 0xcb, 0x05, 0x48,
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0xb4, 0xf9, 0xf4, 0x28, 0x25, 0x1c, 0x3e, 0x98]
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i += 16
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#This is to set Unique Partition GUID. Below Hex Value is : 00ChezaBootblock00
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GPTBlobBuffer[i:i + 16] = [0x00, 0x43, 0x68, 0x65, 0x7a, 0x61, 0x42, 0x6f,
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0x6f, 0x74, 0x62, 0x6c, 0x6f, 0x63, 0x6b, 0x00]
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i += 16
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# LBA of BootBlock Start Content
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GPTBlobBuffer[i:i + 8] = [0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
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i += 8
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# End LBA of BootBlock Content
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GPTBlobBuffer[i] = options.end_lba & 0xFF
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GPTBlobBuffer[i+1] = (options.end_lba>>8) & 0xFF
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GPTBlobBuffer[i+2] = (options.end_lba>>16) & 0xFF
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GPTBlobBuffer[i+3] = (options.end_lba>>24) & 0xFF
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GPTBlobBuffer[i+4] = (options.end_lba>>32) & 0xFF
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GPTBlobBuffer[i+5] = (options.end_lba>>40) & 0xFF
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GPTBlobBuffer[i+6] = (options.end_lba>>48) & 0xFF
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GPTBlobBuffer[i+7] = (options.end_lba>>56) & 0xFF
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i += 8
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# Attributes
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GPTBlobBuffer[i:i + 8] = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
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i += 8
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# Label
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GPTBlobBuffer[i:i + 17] = [0x62, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x74, 0x00,
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0x62, 0x00, 0x6c, 0x00, 0x6f, 0x00, 0x63, 0x00, 0x6b]
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return i
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def UpdateGPTHeader(options, GPTBlobBuffer):
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i = options.sector_size
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# Signature and Revision and HeaderSize i.e. "EFI PART" and 00 00 01 00
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# and 5C 00 00 00
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GPTBlobBuffer[i:i + 16] = [0x45, 0x46, 0x49, 0x20, 0x50, 0x41, 0x52, 0x54,
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0x00, 0x00, 0x01, 0x00, 0x5C, 0x00, 0x00, 0x00]
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i += 16
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# CRC is zeroed out till calculated later
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GPTBlobBuffer[i:i + 4] = [0x00, 0x00, 0x00, 0x00]
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i += 4
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# Reserved, set to 0
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GPTBlobBuffer[i:i + 4] = [0x00, 0x00, 0x00, 0x00]
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i += 4
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# Current LBA
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GPTBlobBuffer[i:i + 8] = [0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
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i += 8
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# Backup LBA, No Backup Gpt Used
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GPTBlobBuffer[i:i + 8] = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
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i += 8
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# First Usuable LBA (qc_sec + bootblock location)
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GPTBlobBuffer[i:i + 8] = [0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
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i += 8
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# Last Usuable LBA (qc_sec + bootblock end location)
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GPTBlobBuffer[i] = options.end_lba & 0xFF
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GPTBlobBuffer[i+1] = (options.end_lba>>8) & 0xFF
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GPTBlobBuffer[i+2] = (options.end_lba>>16) & 0xFF
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GPTBlobBuffer[i+3] = (options.end_lba>>24) & 0xFF
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GPTBlobBuffer[i+4] = (options.end_lba>>32) & 0xFF
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GPTBlobBuffer[i+5] = (options.end_lba>>40) & 0xFF
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GPTBlobBuffer[i+6] = (options.end_lba>>48) & 0xFF
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GPTBlobBuffer[i+7] = (options.end_lba>>56) & 0xFF
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i += 8
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# GUID
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GPTBlobBuffer[i:i + 16] = [0x32,0x1B,0x10,0x98,0xE2,0xBB,0xF2,0x4B,
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0xA0,0x6E,0x2B,0xB3,0x3D,0x00,0x0C,0x20]
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i += 16
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# Partition Table Entry LBA
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GPTBlobBuffer[i:i + 8] = [0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
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i += 8
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# Number of Partition Entries
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GPTBlobBuffer[i:i + 4] = [0x01, 0x00, 0x00, 0x00]
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i += 4
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# Size of One Partition Entry
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GPTBlobBuffer[i:i + 4] = [0x80, 0x00, 0x00, 0x00]
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i += 4
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# CRC of Partition Entry
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PartEntry = GPTBlobBuffer[options.sector_size*2:options.sector_size*2 + 128]
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CalcEntryCRC = crc32(b''.join(struct.pack("B", x) for x in PartEntry))
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GPTBlobBuffer[i] = CalcEntryCRC & 0xFF
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GPTBlobBuffer[i+1] = (CalcEntryCRC>>8) & 0xFF
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GPTBlobBuffer[i+2] = (CalcEntryCRC>>16) & 0xFF
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GPTBlobBuffer[i+3] = (CalcEntryCRC>>24) & 0xFF
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i += 4
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# CRC of Partition Table Header
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GPTHeader = GPTBlobBuffer[options.sector_size:options.sector_size + 92]
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CalcEntryCRC = crc32(b''.join(struct.pack("B", x) for x in GPTHeader))
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i = options.sector_size + 16
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GPTBlobBuffer[i] = CalcEntryCRC & 0xFF
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GPTBlobBuffer[i+1] = (CalcEntryCRC>>8) & 0xFF
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GPTBlobBuffer[i+2] = (CalcEntryCRC>>16) & 0xFF
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GPTBlobBuffer[i+3] = (CalcEntryCRC>>24) & 0xFF
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return i
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if __name__ == '__main__':
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usage = 'usage: %prog [OPTIONS] INFILE OUTFILE\n\n' + \
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'Packages IMAGE in a GPT format.'
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parser = OptionParser(usage)
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parser.add_option('-s', type="int", dest='sector_size', default=4096,
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help='Sector size in bytes [Default:4096(4KB)]',
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metavar='SIZE')
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(options, args) = parser.parse_args()
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if len(args) != 2:
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print("Invalid arguments! Exiting...\n")
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parser.print_help()
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sys.exit(1)
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if options.sector_size != 4096 and options.sector_size != 512:
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print("Invalid Sector Size")
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sys.exit(1)
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options.inputfile = args[0]
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options.outputfile = args[1]
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with open(options.inputfile, 'rb+') as fin:
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bb_buffer = fin.read()
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# Round up to next sector if bootblock size not evenly divisible
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options.end_lba = ((len(bb_buffer) + options.sector_size - 1) //
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options.sector_size)
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# Add 3 sectors for MBR, GPT header and GPT partition entry
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options.end_lba += 3
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# Subtract one because this is last usable LBA, not amount of LBAs
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options.end_lba -= 1
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GPTBlobBuffer = [0] * (options.sector_size*3) #Size of MBR+GPT+PART_ENTRY
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UpdateMBR(options, GPTBlobBuffer)
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UpdatePartitionEntry(options, GPTBlobBuffer)
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UpdateGPTHeader(options, GPTBlobBuffer)
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with open(options.outputfile, 'wb') as fout:
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for b in GPTBlobBuffer:
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fout.write(struct.pack("B", b))
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fout.write(bb_buffer)
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