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Apple EFI IM4P Splitter v2.1

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Improved Intel Flash Descriptor detection & parsing
This commit is contained in:
platomav 2020-07-04 19:20:00 +03:00
parent 76f42ccf61
commit e61e4b7bed
1 changed files with 15 additions and 15 deletions
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30
Apple EFI IM4P Splitter/Apple_EFI_Split.py
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@ -6,7 +6,7 @@ Apple EFI IM4P Splitter
Copyright (C) 2018-2020 Plato Mavropoulos
"""
title = 'Apple EFI IM4P Splitter v2.0'
title = 'Apple EFI IM4P Splitter v2.1'
import os
import re
@ -99,32 +99,32 @@ for input_file in apple_im4p :
for fd_idx in range(fd_count) :
fd = fd_matches[fd_idx] # Get Intel Flash Descriptor match object
# Platform Controller Hub (PCH)
if (fd.start() == 0x10 or buffer[fd.start() - 0x4:fd.start()] == b'\xFF' * 4) \
and buffer[fd.start() + 0x4] in [3,2] and buffer[fd.start() + 0x6] == 4 :
start_substruct = 0x10 # At PCH, Flash Descriptor starts at 0x10
end_substruct = 0xBC # 0xBC for [0xAC] + 0xFF * 16 sanity check
fd_flmap0_fcba = buffer[fd.start() + 0x4] * 0x10 # Component Base Address from FD start (ICH8-ICH10 = 1, IBX = 2, CPT+ = 3)
# I/O Controller Hub (ICH)
else :
if fd_flmap0_fcba == 0x10 :
start_substruct = 0x0 # At ICH, Flash Descriptor starts at 0x0
end_substruct = 0xBC # 0xBC for [0xAC] + 0xFF * 16 sanity check
# Platform Controller Hub (PCH)
else :
start_substruct = 0x10 # At PCH, Flash Descriptor starts at 0x10
end_substruct = 0xBC # 0xBC for [0xAC] + 0xFF * 16 sanity check
fd_match_start = fd.start() - start_substruct # Actual Flash Descriptor Start Offset
fd_match_end = fd.end() - end_substruct # Actual Flash Descriptor End Offset
# Calculate Intel Flash Descriptor Flash Component Total Size
fd_flmap0_nc = ((int.from_bytes(buffer[fd_match_end:fd_match_end + 0x4], 'little') >> 8) & 3) + 1 # Component Count (00 = 1, 01 = 2)
fd_flmap1_isl = buffer[fd_match_end + 0x7] # PCH Strap Length (ICH8-IBX <= 0x10, CPT-PPT = 0x12, LPT+ >= 0x15)
fd_comp_den_off = 0x1C if fd_flmap1_isl > 0x10 else 0xC # Component Density Offset (ICH8-IBX = 0xC, CPT+ = 0x1C)
fd_comp_den_byte = buffer[fd_match_end + fd_comp_den_off] # Component Density Byte (ICH8-PPT = 0:5, LPT+ = 0:7)
fd_comp_1_bitwise = 0xF if fd_flmap1_isl >= 0x15 else 0x7 # Component 1 Density Bits (ICH8-PPT = 3, LPT+ = 4)
fd_comp_2_bitwise = 0x4 if fd_flmap1_isl >= 0x15 else 0x3 # Component 2 Density Bits (ICH8-PPT = 3, LPT+ = 4)
fd_comp_all_size = comp_dict[fd_comp_den_byte & fd_comp_1_bitwise] # Component 1 Density (FCBA > C0DEN)
if fd_flmap0_nc == 2 : fd_comp_all_size += comp_dict[fd_comp_den_byte >> fd_comp_2_bitwise] # Component 2 Density (FCBA > C1DEN)
fd_flmap1_isl = buffer[fd_match_end + 0x7] # PCH/ICH Strap Length (ME 2-8 & TXE 0-2 & SPS 1-2 <= 0x12, ME 9+ & TXE 3+ & SPS 3+ >= 0x13)
fd_comp_den = buffer[fd_match_start + fd_flmap0_fcba] # Component Density Byte (ME 2-8 & TXE 0-2 & SPS 1-2 = 0:5, ME 9+ & TXE 3+ & SPS 3+ = 0:7)
fd_comp_1_bitwise = 0xF if fd_flmap1_isl >= 0x13 else 0x7 # Component 1 Density Bits (ME 2-8 & TXE 0-2 & SPS 1-2 = 3, ME 9+ & TXE 3+ & SPS 3+ = 4)
fd_comp_2_bitwise = 0x4 if fd_flmap1_isl >= 0x13 else 0x3 # Component 2 Density Bits (ME 2-8 & TXE 0-2 & SPS 1-2 = 3, ME 9+ & TXE 3+ & SPS 3+ = 4)
fd_comp_all_size = comp_dict[fd_comp_den & fd_comp_1_bitwise] # Component 1 Density (FCBA > C0DEN)
if fd_flmap0_nc == 2 : fd_comp_all_size += comp_dict[fd_comp_den >> fd_comp_2_bitwise] # Component 2 Density (FCBA > C1DEN)
fd_final.append((fd_match_start,fd_comp_all_size)) # Store Intel Flash Descriptor final info
# Split IM4P via the final Intel Flash Descriptor mathes
# Split IM4P via the final Intel Flash Descriptor matches
for fd_idx in range(fd_count) :
fd = fd_final[fd_idx] # Get Intel Flash Descriptor final info [FD Start, FD Component(s) Size]