diff options
Diffstat (limited to 'scripts/checkrom.py')
| -rwxr-xr-x | scripts/checkrom.py | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/scripts/checkrom.py b/scripts/checkrom.py index 83d4671..377277d 100755 --- a/scripts/checkrom.py +++ b/scripts/checkrom.py @@ -5,8 +5,8 @@ # # This file may be distributed under the terms of the GNU GPLv3 license. -import sys -import layoutrom +import sys, struct +import layoutrom, buildrom from python23compat import as_bytes @@ -14,12 +14,8 @@ def subst(data, offset, new): return data[:offset] + new + data[offset + len(new):] def checksum(data, start, size, csum): - sumbyte = 0 - while size: - sumbyte = sumbyte + ord(data[start + size - 1]) - size = size - 1 - sumbyte = (0x100 - sumbyte) & 0xff - return subst(data, start+csum, chr(sumbyte)) + sumbyte = buildrom.checksum(data[start:start+size]) + return subst(data, start+csum, sumbyte) def main(): # Get args @@ -76,11 +72,11 @@ def main(): tableofs = symbols['csm_compat_table'].offset - symbols['code32flat_start'].offset entry_addr = symbols['entry_csm'].offset - layoutrom.BUILD_BIOS_ADDR - byte1 = chr(entry_addr & 0xff) - byte2 = chr(entry_addr >> 8) - rawdata = subst(rawdata, tableofs+ENTRY_FIELD_OFS, byte1+byte2) + entry_addr = struct.pack('<H', entry_addr) + rawdata = subst(rawdata, tableofs+ENTRY_FIELD_OFS, entry_addr) - tablesize = ord(rawdata[tableofs+SIZE_FIELD_OFS]) + tsfield = tableofs+SIZE_FIELD_OFS + tablesize = ord(rawdata[tsfield:tsfield+1]) rawdata = checksum(rawdata, tableofs, tablesize, CSUM_FIELD_OFS) # Print statistics |