// SPDX-License-Identifier: GPL-2.0 /* * Definitions and wrapper functions for kernel decompressor * * Copyright IBM Corp. 2010 * * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> */ #include <linux/kernel.h> #include <linux/string.h> #include <asm/page.h> #include "decompressor.h" /* * gzip declarations */ #define STATIC static #define STATIC_RW_DATA static __section(.data) #undef memset #undef memcpy #undef memmove #define memmove memmove #define memzero(s, n) memset((s), 0, (n)) /* Symbols defined by linker scripts */ extern char _end[]; extern unsigned char _compressed_start[]; extern unsigned char _compressed_end[]; #ifdef [31mCONFIG_HAVE_KERNEL_BZIP2[0m #define HEAP_SIZE 0x400000 #else #define HEAP_SIZE 0x10000 #endif static unsigned long free_mem_ptr = (unsigned long) _end; static unsigned long free_mem_end_ptr = (unsigned long) _end + HEAP_SIZE; #ifdef [31mCONFIG_KERNEL_GZIP[0m #include "../../../../lib/decompress_inflate.c" #endif #ifdef [31mCONFIG_KERNEL_BZIP2[0m #include "../../../../lib/decompress_bunzip2.c" #endif #ifdef [31mCONFIG_KERNEL_LZ4[0m #include "../../../../lib/decompress_unlz4.c" #endif #ifdef [31mCONFIG_KERNEL_LZMA[0m #include "../../../../lib/decompress_unlzma.c" #endif #ifdef [31mCONFIG_KERNEL_LZO[0m #include "../../../../lib/decompress_unlzo.c" #endif #ifdef [31mCONFIG_KERNEL_XZ[0m #include "../../../../lib/decompress_unxz.c" #endif #define decompress_offset ALIGN((unsigned long)_end + HEAP_SIZE, PAGE_SIZE) unsigned long mem_safe_offset(void) { /* * due to 4MB HEAD_SIZE for bzip2 * 'decompress_offset + vmlinux.image_size' could be larger than * kernel at final position + its .bss, so take the larger of two */ return max(decompress_offset + vmlinux.image_size, vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size); } void *decompress_kernel(void) { void *output = (void *)decompress_offset; __decompress(_compressed_start, _compressed_end - _compressed_start, NULL, NULL, output, 0, NULL, error); return output; } |