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#include "boot.h" 15 16/* 17 * gzip declarations 18 */ 19#define STATIC static 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#if defined(CONFIG_KERNEL_BZIP2) 28#define BOOT_HEAP_SIZE 0x400000 29#elif defined(CONFIG_KERNEL_ZSTD) 30#define BOOT_HEAP_SIZE 0x30000 31#else 32#define BOOT_HEAP_SIZE 0x10000 33#endif 34 35static unsigned long free_mem_ptr = (unsigned long) _end; 36static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE; 37 38#ifdef CONFIG_KERNEL_GZIP 39#include "../../../../lib/decompress_inflate.c" 40#endif 41 42#ifdef CONFIG_KERNEL_BZIP2 43#include "../../../../lib/decompress_bunzip2.c" 44#endif 45 46#ifdef CONFIG_KERNEL_LZ4 47#include "../../../../lib/decompress_unlz4.c" 48#endif 49 50#ifdef CONFIG_KERNEL_LZMA 51#include "../../../../lib/decompress_unlzma.c" 52#endif 53 54#ifdef CONFIG_KERNEL_LZO 55#include "../../../../lib/decompress_unlzo.c" 56#endif 57 58#ifdef CONFIG_KERNEL_XZ 59#include "../../../../lib/decompress_unxz.c" 60#endif 61 62#ifdef CONFIG_KERNEL_ZSTD 63#include "../../../../lib/decompress_unzstd.c" 64#endif 65 66#define decompress_offset ALIGN((unsigned long)_end + BOOT_HEAP_SIZE, PAGE_SIZE) 67 68unsigned long mem_safe_offset(void) 69{ 70 /* 71 * due to 4MB HEAD_SIZE for bzip2 72 * 'decompress_offset + vmlinux.image_size' could be larger than 73 * kernel at final position + its .bss, so take the larger of two 74 */ 75 return max(decompress_offset + vmlinux.image_size, 76 vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size); 77} 78 79void *decompress_kernel(void) 80{ 81 void *output = (void *)decompress_offset; 82 83 __decompress(_compressed_start, _compressed_end - _compressed_start, 84 NULL, NULL, output, vmlinux.image_size, NULL, error); 85 return output; 86} 87