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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/s390/boot/decompressor.c
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// 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 <[email protected]>

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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/boot_data.h>

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#include <asm/page.h>

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#include "decompressor.h"

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#include "boot.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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#if defined(CONFIG_KERNEL_BZIP2)

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#define BOOT_HEAP_SIZE	0x400000

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#elif defined(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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static void decompress_error(char *m)

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{

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	if (bootdebug)

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		boot_rb_dump();

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	boot_emerg("Decompression error: %s\n", m);

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	boot_emerg(" -- System halted\n");

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	disabled_wait();

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}

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unsigned long mem_safe_offset(void)

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{

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	return ALIGN(free_mem_end_ptr, PAGE_SIZE);

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}

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void deploy_kernel(void *output)

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{

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	__decompress(_compressed_start, _compressed_end - _compressed_start,

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		     NULL, NULL, output, vmlinux.image_size, NULL, decompress_error);

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}

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