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#!/usr/bin/env python
# Script to merge a rom32.bin file into a rom16.bin file.
#
# Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import sys
import struct
ROM16='out/rom16.bin'
ROM32='out/rom32.bin'
OFFSETS16='out/rom16.offset.auto.h'
OFFSETS32='out/rom32.offset.auto.h'
OUT='out/rom.bin'
def align(v, a):
return (v + a - 1) // a * a
def scanconfig(file):
f = open(file, 'rb')
opts = {}
for l in f.readlines():
parts = l.split()
if len(parts) != 3:
continue
if parts[0] != '#define':
continue
opts[parts[1]] = parts[2]
return opts
def alteraddr(data, offset, ptr):
rel = struct.pack("<i", ptr)
return data[:offset] + rel + data[offset+4:]
def main():
# Read in files
f = open(ROM16, 'rb')
data16 = f.read()
f = open(ROM32, 'rb')
data32 = f.read()
if len(data16) != 65536:
print "16bit code is not 65536 bytes long"
sys.exit(1)
# Get config options
o16 = scanconfig(OFFSETS16)
o32 = scanconfig(OFFSETS32)
# Inject 32bit code
spos = align(int(o16['OFFSET_bios16c_end'], 16), 16)
epos = int(o16['OFFSET_post16'], 16)
size32 = len(data32)
freespace = epos - spos
if size32 > freespace:
print "32bit code too large (%d vs %d)" % (size32, freespace)
sys.exit(1)
outrom = data16[:spos] + data32 + data16[spos+size32:]
# Fixup initial jump to 32 bit code
jmppos = int(o16['OFFSET_set_entry32'], 16)
start32 = int(o32['OFFSET__start'], 16)
outrom = alteraddr(outrom, jmppos+2, start32)
# Fixup resume from 16 jump to 32 bit code
jmppos = int(o16['OFFSET_set_resume32'], 16)
resume32 = int(o32['OFFSET_call16_resume'], 16)
outrom = alteraddr(outrom, jmppos+2, resume32)
# Write output rom
f = open(OUT, 'wb')
f.write(outrom)
f.close()
if __name__ == '__main__':
main()
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