LXR linux/arch/s390/boot/compressed/decompressor.c

   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#define STATIC_RW_DATA static __section(.data)
  20
  21#undef memset
  22#undef memcpy
  23#undef memmove
  24#define memmove memmove
  25#define memzero(s, n) memset((s), 0, (n))
  26
  27/* Symbols defined by linker scripts */
  28extern char _end[];
  29extern unsigned char _compressed_start[];
  30extern unsigned char _compressed_end[];
  31
  32#ifdef CONFIG_HAVE_KERNEL_BZIP2
  33#define BOOT_HEAP_SIZE  0x400000
  34#else
  35#define BOOT_HEAP_SIZE  0x10000
  36#endif
  37
  38static unsigned long free_mem_ptr = (unsigned long) _end;
  39static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE;
  40
  41#ifdef CONFIG_KERNEL_GZIP
  42#include "../../../../lib/decompress_inflate.c"
  43#endif
  44
  45#ifdef CONFIG_KERNEL_BZIP2
  46#include "../../../../lib/decompress_bunzip2.c"
  47#endif
  48
  49#ifdef CONFIG_KERNEL_LZ4
  50#include "../../../../lib/decompress_unlz4.c"
  51#endif
  52
  53#ifdef CONFIG_KERNEL_LZMA
  54#include "../../../../lib/decompress_unlzma.c"
  55#endif
  56
  57#ifdef CONFIG_KERNEL_LZO
  58#include "../../../../lib/decompress_unlzo.c"
  59#endif
  60
  61#ifdef CONFIG_KERNEL_XZ
  62#include "../../../../lib/decompress_unxz.c"
  63#endif
  64
  65#define decompress_offset ALIGN((unsigned long)_end + BOOT_HEAP_SIZE, PAGE_SIZE)
  66
  67unsigned long mem_safe_offset(void)
  68{
  69        /*
  70         * due to 4MB HEAD_SIZE for bzip2
  71         * 'decompress_offset + vmlinux.image_size' could be larger than
  72         * kernel at final position + its .bss, so take the larger of two
  73         */
  74        return max(decompress_offset + vmlinux.image_size,
  75                   vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size);
  76}
  77
  78void *decompress_kernel(void)
  79{
  80        void *output = (void *)decompress_offset;
  81
  82        __decompress(_compressed_start, _compressed_end - _compressed_start,
  83                     NULL, NULL, output, 0, NULL, error);
  84        return output;
  85}
  86