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Sharpen Parcelfile comments

This commit is contained in:
Elliot Nunn 2019-08-08 23:53:48 +08:00
parent cf388de2c7
commit 694c2d5a27
1 changed files with 31 additions and 38 deletions
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69
tbxi/parcels_dump.py
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@ -13,47 +13,33 @@ from .lowlevel import PrclNodeStruct, PrclChildStruct
HEADER_COMMENT = """
# Automated dump of Toolbox Parcels (magic number 'prcl')
# Parcels contain metadata and binary blob 'children':
# Parcel: type [flags=N] [a=STR] [b=STR]
# Child: <tab> type [flags=N] [name=STR] [src=PATH[.lzss]] [deduplicate=1]
# Inline data: <tab><tab> STR (lines get null-terminated)
#parcel_type [metadata...]
\t#child_type [metadata...] [src=*[.lzss]]
\t\t#null_terminated_strings_instead_of_src_file
# They have a four-byte type:
# 'prop': match and edit an existing dev tree node
# 'node': special numbered node to insert into dev tree
# Parcel types are four bytes (child types are unimportant)
# 'prop': match and edit an existing DT node
# 'node': create a new DT node
# 'rom ': Power Macintosh ROM image
# 'psum': black/whitelists for dev tree checksum calc
# 'psum': black/whitelists for computing DT checksum
# Known 'flags' in parcel and child metadata:
# Flag Applies to Meaning
# ----- ----------- ---------------------------------------------
# F0000 prcl, child bitmask of special node number (to create or edit)
# 00200 prcl load node only if needed to access boot disk
# 00100 child prop implements optional 'EtherPrintfLib' debugging
# 00080 child add prop to special node instead of parent
# 00040 child delete existing prop (vs create new prop)
# 00020 child do not replace prop if it already exists
# 00010 prcl, child use node/child only once in the dev tree
# 00008 prcl match node iff ('device_type' prop == 'a' field) AND
# 00004 prcl ('compatible' prop array contains 'b' field OR
# 00002 prcl 'name' prop of parent == 'b' field OR
# 00001 prcl 'name' prop == 'b' field)
# (NB: Here 'node' and 'prop' refer to the dev tree, not to parcel types.)
# Miscellany:
# - A child's type is unimportant.
# - A child's data can be read from a 'src' file or from inline data prefixed
# with 2 tabs, but not both.
# - Appending '.lzss' to a 'src' compresses the data at the base path.
# - The 'psum' parcel selects contributors to dev tree checksum, with 'csta'
# children in this order:
# 1. property whitelist
# 2. node 'name' whitelist
# 3. node 'name' blacklist
# 4. node 'device-type' whitelist
# 5. node 'device-type' blacklist
# - Rebuilds are not byte-perfect because the original padding contains
# uninitialized data.
# Flag Struct Meaning of known flag
# ----- ------ --------------------------------------------
# F0000 parcel (bitmask) number of new 'special' DT node
# 00200 parcel edit DT node only if required for boot disk
# 00010 parcel use only once
# 00008 parcel match DT node if: ('device_type' == a field)
# 00004 parcel AND ('compatible' contains b field
# 00002 parcel OR parent 'name' == b field
# 00001 parcel OR 'name' == b field)
# ----- ------ --------------------------------------------
# F0000 child (bitmask) number of 'special' parent
# 00080 child create DT prop under 'special' DT node above
# 00100 child DT prop is for boot debugging only
# 00040 child delete existing DT prop (vs create)
# 00020 child do not replace existing DT prop
# 00010 child use only once
# 00004 child checksum enabled (crc32)
""".strip()
@ -238,6 +224,13 @@ def dump(binary, dest_dir):
if binary_counts[unique_binary_tpl(prclchild)] > 1:
line += ' deduplicate=1'
if prclnode.ostype == 'psum' and prclchild.ostype == 'csta':
if prclchild is children[0]: line += " # [5] Property whitelist:"
if prclchild is children[1]: line += " # [4] Node 'name' whitelist:"
if prclchild is children[2]: line += " # [3] Node 'name' blacklist:"
if prclchild is children[3]: line += " # [2] Node 'device-type' whitelist:"
if prclchild is children[4]: line += " # [1] Node 'device-type' blacklist:"
print(line, file=f)
if prclchild.ostype in ('cstr', 'csta'):