s390/boot/decompressor.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Definitions and wrapper functions for kernel decompressor
0004  *
0005  * Copyright IBM Corp. 2010
0006  *
0007  * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
0008  */
0009
0010 #include <linux/kernel.h>
0011 #include <linux/string.h>
0012 #include <asm/page.h>
0013 #include "decompressor.h"
0014
0015 /*
0016  * gzip declarations
0017  */
0018 #define STATIC static
0019
0020 #undef memset
0021 #undef memcpy
0022 #undef memmove
0023 #define memmove memmove
0024 #define memzero(s, n) memset((s), 0, (n))
0025
0026 #ifdef CONFIG_KERNEL_BZIP2
0027 #define BOOT_HEAP_SIZE  0x400000
0028 #elif CONFIG_KERNEL_ZSTD
0029 #define BOOT_HEAP_SIZE  0x30000
0030 #else
0031 #define BOOT_HEAP_SIZE  0x10000
0032 #endif
0033
0034 static unsigned long free_mem_ptr = (unsigned long) _end;
0035 static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE;
0036
0037 #ifdef CONFIG_KERNEL_GZIP
0038 #include "../../../../lib/decompress_inflate.c"
0039 #endif
0040
0041 #ifdef CONFIG_KERNEL_BZIP2
0042 #include "../../../../lib/decompress_bunzip2.c"
0043 #endif
0044
0045 #ifdef CONFIG_KERNEL_LZ4
0046 #include "../../../../lib/decompress_unlz4.c"
0047 #endif
0048
0049 #ifdef CONFIG_KERNEL_LZMA
0050 #include "../../../../lib/decompress_unlzma.c"
0051 #endif
0052
0053 #ifdef CONFIG_KERNEL_LZO
0054 #include "../../../../lib/decompress_unlzo.c"
0055 #endif
0056
0057 #ifdef CONFIG_KERNEL_XZ
0058 #include "../../../../lib/decompress_unxz.c"
0059 #endif
0060
0061 #ifdef CONFIG_KERNEL_ZSTD
0062 #include "../../../../lib/decompress_unzstd.c"
0063 #endif
0064
0065 #define decompress_offset ALIGN((unsigned long)_end + BOOT_HEAP_SIZE, PAGE_SIZE)
0066
0067 unsigned long mem_safe_offset(void)
0068 {
0069     /*
0070      * due to 4MB HEAD_SIZE for bzip2
0071      * 'decompress_offset + vmlinux.image_size' could be larger than
0072      * kernel at final position + its .bss, so take the larger of two
0073      */
0074     return max(decompress_offset + vmlinux.image_size,
0075            vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size);
0076 }
0077
0078 void *decompress_kernel(void)
0079 {
0080     void *output = (void *)decompress_offset;
0081
0082     __decompress(_compressed_start, _compressed_end - _compressed_start,
0083              NULL, NULL, output, 0, NULL, error);
0084     return output;
0085 }