summaryrefslogtreecommitdiffstats
path: root/qemu/roms/seabios/scripts/checkrom.py
diff options
context:
space:
mode:
Diffstat (limited to 'qemu/roms/seabios/scripts/checkrom.py')
-rwxr-xr-xqemu/roms/seabios/scripts/checkrom.py95
1 files changed, 95 insertions, 0 deletions
diff --git a/qemu/roms/seabios/scripts/checkrom.py b/qemu/roms/seabios/scripts/checkrom.py
new file mode 100755
index 000000000..377277db5
--- /dev/null
+++ b/qemu/roms/seabios/scripts/checkrom.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python
+# Script to check a bios image and report info on it.
+#
+# Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+
+import sys, struct
+import layoutrom, buildrom
+
+from python23compat import as_bytes
+
+def subst(data, offset, new):
+ return data[:offset] + new + data[offset + len(new):]
+
+def checksum(data, start, size, csum):
+ sumbyte = buildrom.checksum(data[start:start+size])
+ return subst(data, start+csum, sumbyte)
+
+def main():
+ # Get args
+ objinfo, finalsize, rawfile, outfile = sys.argv[1:]
+
+ # Read in symbols
+ objinfofile = open(objinfo, 'r')
+ symbols = layoutrom.parseObjDump(objinfofile, 'in')[1]
+
+ # Read in raw file
+ f = open(rawfile, 'rb')
+ rawdata = f.read()
+ f.close()
+ datasize = len(rawdata)
+ finalsize = int(finalsize) * 1024
+ if finalsize == 0:
+ finalsize = 64*1024
+ if datasize > 64*1024:
+ finalsize = 128*1024
+ if datasize > 128*1024:
+ finalsize = 256*1024
+ if datasize > finalsize:
+ print("Error! ROM doesn't fit (%d > %d)" % (datasize, finalsize))
+ print(" You have to either increate the size (CONFIG_ROM_SIZE)")
+ print(" or turn off some features (such as hardware support not")
+ print(" needed) to make it fit. Trying a more recent gcc version")
+ print(" might work too.")
+ sys.exit(1)
+
+ # Sanity checks
+ start = symbols['code32flat_start'].offset
+ end = symbols['code32flat_end'].offset
+ expend = layoutrom.BUILD_BIOS_ADDR + layoutrom.BUILD_BIOS_SIZE
+ if end != expend:
+ print("Error! Code does not end at 0x%x (got 0x%x)" % (
+ expend, end))
+ sys.exit(1)
+ if datasize > finalsize:
+ print("Error! Code is too big (0x%x vs 0x%x)" % (
+ datasize, finalsize))
+ sys.exit(1)
+ expdatasize = end - start
+ if datasize != expdatasize:
+ print("Error! Unknown extra data (0x%x vs 0x%x)" % (
+ datasize, expdatasize))
+ sys.exit(1)
+
+ # Fix up CSM Compatibility16 table
+ if 'csm_compat_table' in symbols and 'entry_csm' in symbols:
+ # Field offsets within EFI_COMPATIBILITY16_TABLE
+ ENTRY_FIELD_OFS = 14 # Compatibility16CallOffset (UINT16)
+ SIZE_FIELD_OFS = 5 # TableLength (UINT8)
+ CSUM_FIELD_OFS = 4 # TableChecksum (UINT8)
+
+ tableofs = symbols['csm_compat_table'].offset - symbols['code32flat_start'].offset
+ entry_addr = symbols['entry_csm'].offset - layoutrom.BUILD_BIOS_ADDR
+ entry_addr = struct.pack('<H', entry_addr)
+ rawdata = subst(rawdata, tableofs+ENTRY_FIELD_OFS, entry_addr)
+
+ tsfield = tableofs+SIZE_FIELD_OFS
+ tablesize = ord(rawdata[tsfield:tsfield+1])
+ rawdata = checksum(rawdata, tableofs, tablesize, CSUM_FIELD_OFS)
+
+ # Print statistics
+ runtimesize = end - symbols['code32init_end'].offset
+ print("Total size: %d Fixed: %d Free: %d (used %.1f%% of %dKiB rom)" % (
+ datasize, runtimesize, finalsize - datasize
+ , (datasize / float(finalsize)) * 100.0
+ , int(finalsize / 1024)))
+
+ # Write final file
+ f = open(outfile, 'wb')
+ f.write((as_bytes("\0") * (finalsize - datasize)) + rawdata)
+ f.close()
+
+if __name__ == '__main__':
+ main()