linux/arch/s390/boot/compressed/decompressor.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Definitions and wrapper functions for kernel decompressor
   4 *
   5 * Copyright IBM Corp. 2010
   6 *
   7 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/string.h>
  12#include <asm/page.h>
  13#include "decompressor.h"
  14
  15/*
  16 * gzip declarations
  17 */
  18#define STATIC static
  19
  20#undef memset
  21#undef memcpy
  22#undef memmove
  23#define memmove memmove
  24#define memzero(s, n) memset((s), 0, (n))
  25
  26/* Symbols defined by linker scripts */
  27extern char _end[];
  28extern unsigned char _compressed_start[];
  29extern unsigned char _compressed_end[];
  30
  31#ifdef CONFIG_KERNEL_BZIP2
  32#define BOOT_HEAP_SIZE  0x400000
  33#elif CONFIG_KERNEL_ZSTD
  34#define BOOT_HEAP_SIZE  0x30000
  35#else
  36#define BOOT_HEAP_SIZE  0x10000
  37#endif
  38
  39static unsigned long free_mem_ptr = (unsigned long) _end;
  40static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE;
  41
  42#ifdef CONFIG_KERNEL_GZIP
  43#include "../../../../lib/decompress_inflate.c"
  44#endif
  45
  46#ifdef CONFIG_KERNEL_BZIP2
  47#include "../../../../lib/decompress_bunzip2.c"
  48#endif
  49
  50#ifdef CONFIG_KERNEL_LZ4
  51#include "../../../../lib/decompress_unlz4.c"
  52#endif
  53
  54#ifdef CONFIG_KERNEL_LZMA
  55#include "../../../../lib/decompress_unlzma.c"
  56#endif
  57
  58#ifdef CONFIG_KERNEL_LZO
  59#include "../../../../lib/decompress_unlzo.c"
  60#endif
  61
  62#ifdef CONFIG_KERNEL_XZ
  63#include "../../../../lib/decompress_unxz.c"
  64#endif
  65
  66#ifdef CONFIG_KERNEL_ZSTD
  67#include "../../../../lib/decompress_unzstd.c"
  68#endif
  69
  70#define decompress_offset ALIGN((unsigned long)_end + BOOT_HEAP_SIZE, PAGE_SIZE)
  71
  72unsigned long mem_safe_offset(void)
  73{
  74        /*
  75         * due to 4MB HEAD_SIZE for bzip2
  76         * 'decompress_offset + vmlinux.image_size' could be larger than
  77         * kernel at final position + its .bss, so take the larger of two
  78         */
  79        return max(decompress_offset + vmlinux.image_size,
  80                   vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size);
  81}
  82
  83void *decompress_kernel(void)
  84{
  85        void *output = (void *)decompress_offset;
  86
  87        __decompress(_compressed_start, _compressed_end - _compressed_start,
  88                     NULL, NULL, output, 0, NULL, error);
  89        return output;
  90}
  91