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@@ -0,0 +1,44 @@
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+# SPDX-License-Identifier: GPL-2.0+
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+# Copyright 2021 Google LLC
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+# Written by Simon Glass <sjg@chromium.org>
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+#
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+# Entry-type module for BSS padding for tpl/u-boot-tpl.bin. This padding
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+# can be added after the TPL binary to ensure that anything concatenated
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+# to it will appear to TPL to be at the end of BSS rather than the start.
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+#
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+
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+from binman import elf
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+from binman.entry import Entry
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+from binman.etype.blob import Entry_blob
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+from patman import tools
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+
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+class Entry_u_boot_tpl_bss_pad(Entry_blob):
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+ """U-Boot TPL binary padded with a BSS region
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+
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+ Properties / Entry arguments:
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+ None
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+
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+ This holds the padding added after the TPL binary to cover the BSS (Block
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+ Started by Symbol) region. This region holds the various variables used by
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+ TPL. It is set to 0 by TPL when it starts up. If you want to append data to
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+ the TPL image (such as a device tree file), you must pad out the BSS region
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+ to avoid the data overlapping with U-Boot variables. This entry is useful in
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+ that case. It automatically pads out the entry size to cover both the code,
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+ data and BSS.
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+
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+ The contents of this entry will a certain number of zero bytes, determined
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+ by __bss_size
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+
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+ The ELF file 'tpl/u-boot-tpl' must also be available for this to work, since
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+ binman uses that to look up the BSS address.
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+ """
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+ def __init__(self, section, etype, node):
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+ super().__init__(section, etype, node)
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+
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+ def ObtainContents(self):
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+ fname = tools.GetInputFilename('tpl/u-boot-tpl')
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+ bss_size = elf.GetSymbolAddress(fname, '__bss_size')
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+ if not bss_size:
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+ self.Raise('Expected __bss_size symbol in tpl/u-boot-tpl')
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+ self.SetContents(tools.GetBytes(0, bss_size))
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+ return True
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