cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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decompressor.c (1946B)

      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#ifdef CONFIG_KERNEL_BZIP2
     27#define BOOT_HEAP_SIZE	0x400000
     28#elif CONFIG_KERNEL_ZSTD
     29#define BOOT_HEAP_SIZE	0x30000
     30#else
     31#define BOOT_HEAP_SIZE	0x10000
     32#endif
     33
     34static unsigned long free_mem_ptr = (unsigned long) _end;
     35static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE;
     36
     37#ifdef CONFIG_KERNEL_GZIP
     38#include "../../../../lib/decompress_inflate.c"
     39#endif
     40
     41#ifdef CONFIG_KERNEL_BZIP2
     42#include "../../../../lib/decompress_bunzip2.c"
     43#endif
     44
     45#ifdef CONFIG_KERNEL_LZ4
     46#include "../../../../lib/decompress_unlz4.c"
     47#endif
     48
     49#ifdef CONFIG_KERNEL_LZMA
     50#include "../../../../lib/decompress_unlzma.c"
     51#endif
     52
     53#ifdef CONFIG_KERNEL_LZO
     54#include "../../../../lib/decompress_unlzo.c"
     55#endif
     56
     57#ifdef CONFIG_KERNEL_XZ
     58#include "../../../../lib/decompress_unxz.c"
     59#endif
     60
     61#ifdef CONFIG_KERNEL_ZSTD
     62#include "../../../../lib/decompress_unzstd.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}