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edd4a86673
The final kernel image is created by linking decompressor object files with a startup archive. The startup archive file however does not contain only optional code and data which can be discarded if not referenced. It also contains mandatory object data like head.o which must never be discarded, even if not referenced. Move the decompresser code and linker script to the boot directory and get rid of the startup archive so everything is kept during link time. Acked-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Definitions and wrapper functions for kernel decompressor
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*
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* Copyright IBM Corp. 2010
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <asm/page.h>
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#include "decompressor.h"
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/*
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* gzip declarations
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*/
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#define STATIC static
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#undef memset
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#undef memcpy
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#undef memmove
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#define memmove memmove
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#define memzero(s, n) memset((s), 0, (n))
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#ifdef CONFIG_KERNEL_BZIP2
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#define BOOT_HEAP_SIZE 0x400000
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#elif CONFIG_KERNEL_ZSTD
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#define BOOT_HEAP_SIZE 0x30000
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#else
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#define BOOT_HEAP_SIZE 0x10000
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#endif
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static unsigned long free_mem_ptr = (unsigned long) _end;
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static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE;
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#ifdef CONFIG_KERNEL_GZIP
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#include "../../../../lib/decompress_inflate.c"
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#endif
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#ifdef CONFIG_KERNEL_BZIP2
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#include "../../../../lib/decompress_bunzip2.c"
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#endif
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#ifdef CONFIG_KERNEL_LZ4
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#include "../../../../lib/decompress_unlz4.c"
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#endif
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#ifdef CONFIG_KERNEL_LZMA
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#include "../../../../lib/decompress_unlzma.c"
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#endif
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#ifdef CONFIG_KERNEL_LZO
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#include "../../../../lib/decompress_unlzo.c"
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#endif
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#ifdef CONFIG_KERNEL_XZ
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#include "../../../../lib/decompress_unxz.c"
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#endif
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#ifdef CONFIG_KERNEL_ZSTD
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#include "../../../../lib/decompress_unzstd.c"
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#endif
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#define decompress_offset ALIGN((unsigned long)_end + BOOT_HEAP_SIZE, PAGE_SIZE)
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unsigned long mem_safe_offset(void)
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{
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/*
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* due to 4MB HEAD_SIZE for bzip2
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* 'decompress_offset + vmlinux.image_size' could be larger than
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* kernel at final position + its .bss, so take the larger of two
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*/
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return max(decompress_offset + vmlinux.image_size,
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vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size);
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}
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void *decompress_kernel(void)
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{
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void *output = (void *)decompress_offset;
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__decompress(_compressed_start, _compressed_end - _compressed_start,
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NULL, NULL, output, 0, NULL, error);
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return output;
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}
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