1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
#!/usr/bin/env python2
#============================================================================
#
#/** @file qgpt.py
#
# GENERAL DESCRIPTION
# Generates QCom GPT header for wrapping Bootblock
#
# Copyright (c) 2018, The Linux Foundation. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of The Linux Foundation nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#**/
#
import os
import math
import random
import re
import struct
import sys
import tempfile
from binascii import crc32
from optparse import OptionParser
from types import *
def UpdateMBR(options, GPTBlobBuffer):
i = 0x1BE
GPTBlobBuffer[i + 0] = 0x00 # not bootable
GPTBlobBuffer[i + 1] = 0x00 # head
GPTBlobBuffer[i + 2] = 0x01 # sector
GPTBlobBuffer[i + 3] = 0x00 # cylinder
GPTBlobBuffer[i + 4] = 0xEE # type
GPTBlobBuffer[i + 5] = 0xFF # head
GPTBlobBuffer[i + 6] = 0xFF # sector
GPTBlobBuffer[i + 7] = 0xFF # cylinder
GPTBlobBuffer[i + 8:i + 8 + 4] = [0x01, 0x00, 0x00, 0x00]
GPTBlobBuffer[i + 12:i + 16] = [0x00, 0x0f, 0x00, 0x00]
# magic byte for MBR partitioning - always at this location regardless of
# options.sector
GPTBlobBuffer[510:512] = [0x55, 0xAA]
return i
def UpdatePartitionEntry(options, GPTBlobBuffer):
i = 2 * options.sector_size
# GUID of Boot Block
GPTBlobBuffer[i:i + 16] = [0x2c, 0xba, 0xa0, 0xde, 0xdd, 0xcb, 0x05, 0x48,
0xb4, 0xf9, 0xf4, 0x28, 0x25, 0x1c, 0x3e, 0x98]
i += 16
#This is to set Unique Partition GUID. Below Hex Value is : 00ChezaBootblock00
GPTBlobBuffer[i:i + 16] = [0x00, 0x43, 0x68, 0x65, 0x7a, 0x61, 0x42, 0x6f,
0x6f, 0x74, 0x62, 0x6c, 0x6f, 0x63, 0x6b, 0x00]
i += 16
# LBA of BootBlock Start Content
GPTBlobBuffer[i:i + 8] = [0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
i += 8
# End LBA of BootBlock Content
GPTBlobBuffer[i] = options.end_lba & 0xFF
GPTBlobBuffer[i+1] = (options.end_lba>>8) & 0xFF
GPTBlobBuffer[i+2] = (options.end_lba>>16) & 0xFF
GPTBlobBuffer[i+3] = (options.end_lba>>24) & 0xFF
GPTBlobBuffer[i+4] = (options.end_lba>>32) & 0xFF
GPTBlobBuffer[i+5] = (options.end_lba>>40) & 0xFF
GPTBlobBuffer[i+6] = (options.end_lba>>48) & 0xFF
GPTBlobBuffer[i+7] = (options.end_lba>>56) & 0xFF
i += 8
# Attributes
GPTBlobBuffer[i:i + 8] = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
i += 8
# Label
GPTBlobBuffer[i:i + 17] = [0x62, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x74, 0x00,
0x62, 0x00, 0x6c, 0x00, 0x6f, 0x00, 0x63, 0x00, 0x6b]
return i
def UpdateGPTHeader(options, GPTBlobBuffer):
i = options.sector_size
# Signature and Revision and HeaderSize i.e. "EFI PART" and 00 00 01 00
# and 5C 00 00 00
GPTBlobBuffer[i:i + 16] = [0x45, 0x46, 0x49, 0x20, 0x50, 0x41, 0x52, 0x54,
0x00, 0x00, 0x01, 0x00, 0x5C, 0x00, 0x00, 0x00]
i += 16
# CRC is zeroed out till calculated later
GPTBlobBuffer[i:i + 4] = [0x00, 0x00, 0x00, 0x00]
i += 4
# Reserved, set to 0
GPTBlobBuffer[i:i + 4] = [0x00, 0x00, 0x00, 0x00]
i += 4
# Current LBA
GPTBlobBuffer[i:i + 8] = [0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
i += 8
# Backup LBA, No Backup Gpt Used
GPTBlobBuffer[i:i + 8] = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
i += 8
# First Usuable LBA (qc_sec + bootblock location)
GPTBlobBuffer[i:i + 8] = [0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
i += 8
# Last Usuable LBA (qc_sec + bootblock end location)
GPTBlobBuffer[i] = options.end_lba & 0xFF
GPTBlobBuffer[i+1] = (options.end_lba>>8) & 0xFF
GPTBlobBuffer[i+2] = (options.end_lba>>16) & 0xFF
GPTBlobBuffer[i+3] = (options.end_lba>>24) & 0xFF
GPTBlobBuffer[i+4] = (options.end_lba>>32) & 0xFF
GPTBlobBuffer[i+5] = (options.end_lba>>40) & 0xFF
GPTBlobBuffer[i+6] = (options.end_lba>>48) & 0xFF
GPTBlobBuffer[i+7] = (options.end_lba>>56) & 0xFF
i += 8
# GUID
GPTBlobBuffer[i:i + 16] = [0x32,0x1B,0x10,0x98,0xE2,0xBB,0xF2,0x4B,
0xA0,0x6E,0x2B,0xB3,0x3D,0x00,0x0C,0x20]
i += 16
# Partition Table Entry LBA
GPTBlobBuffer[i:i + 8] = [0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
i += 8
# Number of Partition Entries
GPTBlobBuffer[i:i + 4] = [0x01, 0x00, 0x00, 0x00]
i += 4
# Size of One Partition Entry
GPTBlobBuffer[i:i + 4] = [0x80, 0x00, 0x00, 0x00]
i += 4
# CRC of Partition Entry
PartEntry = GPTBlobBuffer[options.sector_size*2:options.sector_size*2 + 128]
CalcEntryCRC = crc32(b''.join(struct.pack("B", x) for x in PartEntry))
GPTBlobBuffer[i] = CalcEntryCRC & 0xFF
GPTBlobBuffer[i+1] = (CalcEntryCRC>>8) & 0xFF
GPTBlobBuffer[i+2] = (CalcEntryCRC>>16) & 0xFF
GPTBlobBuffer[i+3] = (CalcEntryCRC>>24) & 0xFF
i += 4
# CRC of Partition Table Header
GPTHeader = GPTBlobBuffer[options.sector_size:options.sector_size + 92]
CalcEntryCRC = crc32(b''.join(struct.pack("B", x) for x in GPTHeader))
i = options.sector_size + 16
GPTBlobBuffer[i] = CalcEntryCRC & 0xFF
GPTBlobBuffer[i+1] = (CalcEntryCRC>>8) & 0xFF
GPTBlobBuffer[i+2] = (CalcEntryCRC>>16) & 0xFF
GPTBlobBuffer[i+3] = (CalcEntryCRC>>24) & 0xFF
return i
if __name__ == '__main__':
usage = 'usage: %prog [OPTIONS] INFILE OUTFILE\n\n' + \
'Packages IMAGE in a GPT format.'
parser = OptionParser(usage)
parser.add_option('-s', type="int", dest='sector_size', default=4096,
help='Sector size in bytes [Default:4096(4KB)]',
metavar='SIZE')
(options, args) = parser.parse_args()
if len(args) != 2:
print("Invalid arguments! Exiting...\n")
parser.print_help()
sys.exit(1)
if options.sector_size != 4096 and options.sector_size != 512:
print("Invalid Sector Size")
sys.exit(1)
options.inputfile = args[0]
options.outputfile = args[1]
with open(options.inputfile, 'rb+') as fin:
bb_buffer = fin.read()
# Round up to next sector if bootblock size not evenly divisible
options.end_lba = ((len(bb_buffer) + options.sector_size - 1) //
options.sector_size)
# Add 3 sectors for MBR, GPT header and GPT partition entry
options.end_lba += 3
# Subtract one because this is last usable LBA, not amount of LBAs
options.end_lba -= 1
GPTBlobBuffer = [0] * (options.sector_size*3) #Size of MBR+GPT+PART_ENTRY
UpdateMBR(options, GPTBlobBuffer)
UpdatePartitionEntry(options, GPTBlobBuffer)
UpdateGPTHeader(options, GPTBlobBuffer)
with open(options.outputfile, 'wb') as fout:
for b in GPTBlobBuffer:
fout.write(struct.pack("B", b))
fout.write(bb_buffer)
|
