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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/* Symbols defined by linker scripts */
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extern char _end[];
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extern unsigned char _compressed_start[];
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extern unsigned char _compressed_end[];
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#ifdef CONFIG_HAVE_KERNEL_BZIP2
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#define BOOT_HEAP_SIZE 0x400000
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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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#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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