Add patches for bios_extract

This updates the dell_inspiron_1100.py script from Python 2 to 3 for
better compatibility (some distros have dropped Python 2), and adds
special handling so that it works with the Latitude E6400 BIOS.

These have also been sent upstream, so these patches can be dropped
once they are merged:
https://review.coreboot.org/c/bios_extract/+/74975/
https://review.coreboot.org/c/bios_extract/+/74976/
https://review.coreboot.org/c/bios_extract/+/74977/

resources/bios_extract/patches/0001-dell_inspiron_1100_unpacker-Fix-minor-style-issues.patch

+From d187ceefacc4909c4a3fdb8098878cb9bcd2c198 Mon Sep 17 00:00:00 2001
+From: Nicholas Chin <nic.c3.14@gmail.com>
+Date: Fri, 5 May 2023 19:34:29 -0600
+Subject: [PATCH 1/3] dell_inspiron_1100_unpacker: Fix minor style issues
+
+- Make indent width consistent
+- Use spaces around -= operator
+- Rename variable type to type_id to avoid shadowing the type method,
+  though that method isn't ever used in this program
+
+Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
+Change-Id: I2d47501845591e228b6c5d61c36ca2edce91d36a
+---
+ dell_inspiron_1100_unpacker.py | 84 +++++++++++++++++-----------------
+ 1 file changed, 42 insertions(+), 42 deletions(-)
+
+diff --git a/dell_inspiron_1100_unpacker.py b/dell_inspiron_1100_unpacker.py
+index 3d5adf5..b12059b 100755
+--- a/dell_inspiron_1100_unpacker.py
++++ b/dell_inspiron_1100_unpacker.py
+@@ -19,7 +19,7 @@ def memcpy(arr1, off1, arr2, off2, count):
+             raise Exception("Trying to write out of bounds")
+         off1 += 1
+         off2 += 1
+-        count -=1
++        count -= 1
+ 
+ # looks like some lzss variation
+ def dell_unpack(indata):
+@@ -64,58 +64,58 @@ def dell_unpack(indata):
+     return dst.tostring()
+ 
+ mod_types = {
+-  0x01: "Main ROM",
+-  0x0C: "Microcode update",
++    0x01: "Main ROM",
++    0x0C: "Microcode update",
+ }
+ 
+ print "Dell/Phoenix ROM BIOS PLUS unpacker"
+ if len(sys.argv) < 2:
+-  print "Usage: dell_unpack.py bios.bin [offset]"
+-  sys.exit(1)
++    print "Usage: dell_unpack.py bios.bin [offset]"
++    sys.exit(1)
+ fname = sys.argv[1]
+ offs = 0
+ f = open(fname, "rb").read()
+ if len(sys.argv) > 2:
+-  offs = int(sys.argv[2], 16)
++    offs = int(sys.argv[2], 16)
+ else:
+-  offs = f.find("\xF0\x00Copyright 1985-\x02\x04\xF0\x0F8 Phoenix Technologies Ltd.")
+-  if offs == -1:
+-    print "Does not look like a Dell/Phoenix ROM BIOS PLUS"
+-    sys.exit(2)
+-  if f[offs-5] == '\x01':
+-    hlen = 5 # 32-bit length
+-    offs -= 5
+-    fmt = "<BI"
+-  elif f[offs-3] == '\x01':
+-    hlen = 3 # 16-bit length
+-    offs -= 3
+-    fmt = "<BH"
+-  else:
+-    print "Unhandled format!"
+-    sys.exit(1)
+-  print "Found compressed module at %08X" % offs
++    offs = f.find("\xF0\x00Copyright 1985-\x02\x04\xF0\x0F8 Phoenix Technologies Ltd.")
++    if offs == -1:
++        print "Does not look like a Dell/Phoenix ROM BIOS PLUS"
++        sys.exit(2)
++    if f[offs-5] == '\x01':
++        hlen = 5 # 32-bit length
++        offs -= 5
++        fmt = "<BI"
++    elif f[offs-3] == '\x01':
++        hlen = 3 # 16-bit length
++        offs -= 3
++        fmt = "<BH"
++    else:
++        print "Unhandled format!"
++        sys.exit(1)
++    print "Found compressed module at %08X" % offs
+ if offs > 0:
+     fn = "EC.bin"
+     print "%08X EC code, %08X  %s" % (0, offs, fn)
+     open(fn, "wb").write(f[:offs])
+ while True:
+-  type, leng = struct.unpack(fmt, f[offs:offs+hlen])
+-  print "%08X type %02X" % (offs, type),
+-  offs += hlen
+-  if type == 0xFF:
+-      print "<end of chain>"
+-      break
+-  data = f[offs:offs+leng]
+-  offs += leng
+-  if type != 0xC:
+-      odata = dell_unpack(data)
+-  else:
+-      odata = data
+-  print " %08X -> %08X" % (leng, len(odata)),
+-  fn = "mod_%02X.bin" % type
+-  print " %s" % fn,
+-  if type in mod_types:
+-      print "(%s)" % mod_types[type]
+-  else:
+-      print ""
+-  open(fn, "wb").write(odata)
++    type_id, leng = struct.unpack(fmt, f[offs:offs+hlen])
++    print "%08X type %02X" % (offs, type_id),
++    offs += hlen
++    if type_id == 0xFF:
++        print "<end of chain>"
++        break
++    data = f[offs:offs+leng]
++    offs += leng
++    if type_id != 0xC:
++        odata = dell_unpack(data)
++    else:
++        odata = data
++    print " %08X -> %08X" % (leng, len(odata)),
++    fn = "mod_%02X.bin" % type_id
++    print " %s" % fn,
++    if type_id in mod_types:
++        print "(%s)" % mod_types[type_id]
++    else:
++        print ""
++    open(fn, "wb").write(odata)
+-- 
+2.40.1
+

resources/bios_extract/patches/0002-dell_inspiron_1100_unpacker-Convert-from-python-2-to.patch

+From 34ecbda8cc75eecb747004520c9e0bd6de3c7723 Mon Sep 17 00:00:00 2001
+From: Nicholas Chin <nic.c3.14@gmail.com>
+Date: Fri, 5 May 2023 19:35:45 -0600
+Subject: [PATCH 2/3] dell_inspiron_1100_unpacker: Convert from python 2 to 3
+
+TEST: The output of the script is the same as the python 2 version when
+run against the Inspiron 1100 BIOS
+
+Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
+Change-Id: I2ab9a72bc65121b1106e9867b7d58d1eefb0eb3d
+---
+ dell_inspiron_1100_unpacker.py | 34 +++++++++++++++++-----------------
+ 1 file changed, 17 insertions(+), 17 deletions(-)
+
+diff --git a/dell_inspiron_1100_unpacker.py b/dell_inspiron_1100_unpacker.py
+index b12059b..5e43813 100755
+--- a/dell_inspiron_1100_unpacker.py
++++ b/dell_inspiron_1100_unpacker.py
+@@ -1,4 +1,4 @@
+-#!/usr/bin/env python2
++#!/usr/bin/env python3
+ # Dell/Phoenix ROM BIOS PLUS unpacker
+ # 2012-09-12 version 0.1
+ # 2012-10-10 version 0.2 added support for older BIOSes with 16-bit length (Dell Inspiron 1100)
+@@ -61,16 +61,16 @@ def dell_unpack(indata):
+             dstoff += count
+             srcoff += count
+ 
+-    return dst.tostring()
++    return dst
+ 
+ mod_types = {
+     0x01: "Main ROM",
+     0x0C: "Microcode update",
+ }
+ 
+-print "Dell/Phoenix ROM BIOS PLUS unpacker"
++print("Dell/Phoenix ROM BIOS PLUS unpacker")
+ if len(sys.argv) < 2:
+-    print "Usage: dell_unpack.py bios.bin [offset]"
++    print("Usage: dell_unpack.py bios.bin [offset]")
+     sys.exit(1)
+ fname = sys.argv[1]
+ offs = 0
+@@ -78,32 +78,32 @@ f = open(fname, "rb").read()
+ if len(sys.argv) > 2:
+     offs = int(sys.argv[2], 16)
+ else:
+-    offs = f.find("\xF0\x00Copyright 1985-\x02\x04\xF0\x0F8 Phoenix Technologies Ltd.")
++    offs = f.find(b"\xF0\x00Copyright 1985-\x02\x04\xF0\x0F8 Phoenix Technologies Ltd.")
+     if offs == -1:
+-        print "Does not look like a Dell/Phoenix ROM BIOS PLUS"
++        print("Does not look like a Dell/Phoenix ROM BIOS PLUS")
+         sys.exit(2)
+-    if f[offs-5] == '\x01':
++    if f[offs-5] == 0x01:
+         hlen = 5 # 32-bit length
+         offs -= 5
+         fmt = "<BI"
+-    elif f[offs-3] == '\x01':
++    elif f[offs-3] == 0x01:
+         hlen = 3 # 16-bit length
+         offs -= 3
+         fmt = "<BH"
+     else:
+-        print "Unhandled format!"
++        print("Unhandled format!")
+         sys.exit(1)
+-    print "Found compressed module at %08X" % offs
++    print("Found compressed module at %08X" % offs)
+ if offs > 0:
+     fn = "EC.bin"
+-    print "%08X EC code, %08X  %s" % (0, offs, fn)
++    print("%08X EC code, %08X  %s" % (0, offs, fn))
+     open(fn, "wb").write(f[:offs])
+ while True:
+     type_id, leng = struct.unpack(fmt, f[offs:offs+hlen])
+-    print "%08X type %02X" % (offs, type_id),
++    print("%08X type %02X" % (offs, type_id), end=" ")
+     offs += hlen
+     if type_id == 0xFF:
+-        print "<end of chain>"
++        print("<end of chain>")
+         break
+     data = f[offs:offs+leng]
+     offs += leng
+@@ -111,11 +111,11 @@ while True:
+         odata = dell_unpack(data)
+     else:
+         odata = data
+-    print " %08X -> %08X" % (leng, len(odata)),
++    print(" %08X -> %08X" % (leng, len(odata)), end=" ")
+     fn = "mod_%02X.bin" % type_id
+-    print " %s" % fn,
++    print(" %s" % fn, end=" ")
+     if type_id in mod_types:
+-        print "(%s)" % mod_types[type_id]
++        print("(%s)" % mod_types[type_id])
+     else:
+-        print ""
++        print("")
+     open(fn, "wb").write(odata)
+-- 
+2.40.1
+

resources/bios_extract/patches/0003-dell_inspiron_1100_unpacker-Add-module-type-0x52.patch

+From b3868ed71a390f925eb22b926b9c735f7b84b383 Mon Sep 17 00:00:00 2001
+From: Nicholas Chin <nic.c3.14@gmail.com>
+Date: Sat, 6 May 2023 11:14:45 -0600
+Subject: [PATCH 3/3] dell_inspiron_1100_unpacker: Add module type 0x52
+
+The module with type 0x52 in the Latitude E6400 BIOS is the EC firmware,
+and is not compressed. The current behavior tries to decompress this
+module leading to an index out of bounds error at runtime, so add a new
+condition to avoid decompressing it. This assumes type 0x52 is always
+used for EC firmware.
+
+The current behavior also assumes all the data before the first module
+is EC firmware, which was probably true for the Inspiron 1100, but for
+the E6400 the EC firmware is in module 0x52. However, for simplicity an
+exception is not made for this behavior, so the extracted EC.bin should
+just be treated as spurious data for the E6400.
+
+TEST: Inspiron 1100 BIOS is still unpacked correctly, Latitude E6400
+BIOS unpacks without runtime errors.
+
+Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
+Change-Id: I3152150b7dea4d79840c61683692c65b1311cce2
+---
+ dell_inspiron_1100_unpacker.py | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/dell_inspiron_1100_unpacker.py b/dell_inspiron_1100_unpacker.py
+index 5e43813..3589550 100755
+--- a/dell_inspiron_1100_unpacker.py
++++ b/dell_inspiron_1100_unpacker.py
+@@ -66,6 +66,7 @@ def dell_unpack(indata):
+ mod_types = {
+     0x01: "Main ROM",
+     0x0C: "Microcode update",
++    0x52: "EC firmware"
+ }
+ 
+ print("Dell/Phoenix ROM BIOS PLUS unpacker")
+@@ -107,7 +108,7 @@ while True:
+         break
+     data = f[offs:offs+leng]
+     offs += leng
+-    if type_id != 0xC:
++    if type_id != 0xC and type_id != 0x52:
+         odata = dell_unpack(data)
+     else:
+         odata = data
+-- 
+2.40.1
+