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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d1b52a4388
Introduce .boot.data section which is "shared" between the decompressor code and the decompressed kernel. The decompressor will store values in it, and copy over to the decompressed image before starting it. This method allows to avoid using pre-defined addresses and other hacks to pass values between those boot phases. .boot.data section is a part of init data, and will be freed after kernel initialization is complete. For uncompressed kernel image, .boot.data section is basically the same as .init.data Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
21 lines
755 B
C
21 lines
755 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <asm/page.h>
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/*
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* .boot.data section is shared between the decompressor code and the
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* decompressed kernel. The decompressor will store values in it, and copy
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* over to the decompressed image before starting it.
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*
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* .boot.data variables are kept in separate .boot.data.<var name> sections,
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* which are sorted by alignment first, then by name before being merged
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* into single .boot.data section. This way big holes cased by page aligned
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* structs are avoided and linker produces consistent result.
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*/
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#define BOOT_DATA \
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. = ALIGN(PAGE_SIZE); \
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.boot.data : { \
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__boot_data_start = .; \
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*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.boot.data*))) \
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__boot_data_end = .; \
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}
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