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#!/usr/bin/env python3
# -*- coding: utf-8 -*-"
# Copyright 2019 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# A script to pack EC binary with manifest header according to
# Based on 607297_Host_ISH_Firmware_Load_Chrome_OS_SAS_Rev0p5.pdf,
# https://chrome-internal.googlesource.com/chromeos/intel-ish/+/refs/heads/upstream/master/modules/api/ish_api/include/loader_common.h#211,
# and b/124788278#comment10
"""Script to pack EC binary with manifest header.
Package ecos main FW binary (kernel) and AON task binary into final EC binary
image with a manifest header, ISH shim loader will parse this header and load
each binaries into right memory location.
"""
import argparse
import struct
MANIFEST_ENTRY_SIZE = 0x80
HEADER_SIZE = 0x1000
PAGE_SIZE = 0x1000
def parseargs():
parser = argparse.ArgumentParser()
parser.add_argument(
"-k",
"--kernel",
help="EC kernel binary to pack, usually ec.RW.bin or ec.RW.flat.",
required=True,
)
parser.add_argument(
"--kernel-size", type=int, help="Size of EC kernel image", required=True
)
parser.add_argument(
"-a",
"--aon",
help="EC aontask binary to pack, usually ish_aontask.bin.",
required=False,
)
parser.add_argument(
"--aon-size", type=int, help="Size of EC aontask image", required=False
)
parser.add_argument("-o", "--output", help="Output flash binary file")
return parser.parse_args()
def gen_manifest(ext_id, comp_app_name, code_offset, module_size):
"""Returns a binary blob that represents a manifest entry"""
m = bytearray(MANIFEST_ENTRY_SIZE)
# 4 bytes of ASCII encode ID (little endian)
struct.pack_into("<4s", m, 0, ext_id)
# 8 bytes of ASCII encode ID (little endian)
struct.pack_into("<8s", m, 32, comp_app_name)
# 4 bytes of code offset (little endian)
struct.pack_into("<I", m, 96, code_offset)
# 2 bytes of module in page size increments (little endian)
struct.pack_into("<H", m, 100, module_size)
return m
def roundup_page(size):
"""Returns roundup-ed page size from size of bytes"""
return int(size / PAGE_SIZE) + (size % PAGE_SIZE > 0)
def main():
args = parseargs()
print(" Packing EC image file for ISH")
with open(args.output, "wb") as f:
print(" kernel binary size:", args.kernel_size)
kern_rdup_pg_size = roundup_page(args.kernel_size)
# Add manifest for main ISH binary
f.write(
gen_manifest(b"ISHM", b"ISH_KERN", HEADER_SIZE, kern_rdup_pg_size)
)
if args.aon is not None:
print(" AON binary size: ", args.aon_size)
aon_rdup_pg_size = roundup_page(args.aon_size)
# Add manifest for aontask binary
f.write(
gen_manifest(
b"ISHM",
b"AON_TASK",
(
HEADER_SIZE
+ kern_rdup_pg_size * PAGE_SIZE
- MANIFEST_ENTRY_SIZE
),
aon_rdup_pg_size,
)
)
# Add manifest that signals end of manifests
f.write(gen_manifest(b"ISHE", b"", 0, 0))
# Pad the remaining HEADER with 0s
if args.aon is not None:
f.write(b"\x00" * (HEADER_SIZE - (MANIFEST_ENTRY_SIZE * 3)))
else:
f.write(b"\x00" * (HEADER_SIZE - (MANIFEST_ENTRY_SIZE * 2)))
# Append original kernel image
with open(args.kernel, "rb") as in_file:
f.write(in_file.read())
# Filling padings due to size round up as pages
f.write(b"\x00" * (kern_rdup_pg_size * PAGE_SIZE - args.kernel_size))
if args.aon is not None:
# Append original aon image
with open(args.aon, "rb") as in_file:
f.write(in_file.read())
# Filling padings due to size round up as pages
f.write(b"\x00" * (aon_rdup_pg_size * PAGE_SIZE - args.aon_size))
if __name__ == "__main__":
main()
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