| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 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/uaccess.h> |
| 11 | #include <asm/page.h> |
| 12 | #include <asm/sclp.h> |
| 13 | #include <asm/ipl.h> |
| 14 | #include "sizes.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 | /* Symbols defined by linker scripts */ |
| 28 | extern char input_data[]; |
| 29 | extern int input_len; |
| 30 | extern char _end[]; |
| 31 | extern char _bss[], _ebss[]; |
| 32 | |
| 33 | static void error(char *m); |
| 34 | |
| 35 | static unsigned long free_mem_ptr; |
| 36 | static unsigned long free_mem_end_ptr; |
| 37 | |
| 38 | #ifdef CONFIG_HAVE_KERNEL_BZIP2 |
| 39 | #define HEAP_SIZE 0x400000 |
| 40 | #else |
| 41 | #define HEAP_SIZE 0x10000 |
| 42 | #endif |
| 43 | |
| 44 | #ifdef CONFIG_KERNEL_GZIP |
| 45 | #include "../../../../lib/decompress_inflate.c" |
| 46 | #endif |
| 47 | |
| 48 | #ifdef CONFIG_KERNEL_BZIP2 |
| 49 | #include "../../../../lib/decompress_bunzip2.c" |
| 50 | #endif |
| 51 | |
| 52 | #ifdef CONFIG_KERNEL_LZ4 |
| 53 | #include "../../../../lib/decompress_unlz4.c" |
| 54 | #endif |
| 55 | |
| 56 | #ifdef CONFIG_KERNEL_LZMA |
| 57 | #include "../../../../lib/decompress_unlzma.c" |
| 58 | #endif |
| 59 | |
| 60 | #ifdef CONFIG_KERNEL_LZO |
| 61 | #include "../../../../lib/decompress_unlzo.c" |
| 62 | #endif |
| 63 | |
| 64 | #ifdef CONFIG_KERNEL_XZ |
| 65 | #include "../../../../lib/decompress_unxz.c" |
| 66 | #endif |
| 67 | |
| 68 | static int puts(const char *s) |
| 69 | { |
| 70 | sclp_early_printk(s); |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static void error(char *x) |
| 75 | { |
| 76 | unsigned long long psw = 0x000a0000deadbeefULL; |
| 77 | |
| 78 | puts("\n\n"); |
| 79 | puts(x); |
| 80 | puts("\n\n -- System halted"); |
| 81 | |
| 82 | asm volatile("lpsw %0" : : "Q" (psw)); |
| 83 | } |
| 84 | |
| 85 | unsigned long decompress_kernel(void) |
| 86 | { |
| 87 | void *output, *kernel_end; |
| 88 | |
| 89 | output = (void *) ALIGN((unsigned long) _end + HEAP_SIZE, PAGE_SIZE); |
| 90 | kernel_end = output + SZ__bss_start; |
| 91 | |
| 92 | #ifdef CONFIG_BLK_DEV_INITRD |
| 93 | /* |
| 94 | * Move the initrd right behind the end of the decompressed |
| 95 | * kernel image. This also prevents initrd corruption caused by |
| 96 | * bss clearing since kernel_end will always be located behind the |
| 97 | * current bss section.. |
| 98 | */ |
| 99 | if (INITRD_START && INITRD_SIZE && kernel_end > (void *) INITRD_START) { |
| 100 | memmove(kernel_end, (void *) INITRD_START, INITRD_SIZE); |
| 101 | INITRD_START = (unsigned long) kernel_end; |
| 102 | } |
| 103 | #endif |
| 104 | |
| 105 | /* |
| 106 | * Clear bss section. free_mem_ptr and free_mem_end_ptr need to be |
| 107 | * initialized afterwards since they reside in bss. |
| 108 | */ |
| 109 | memset(_bss, 0, _ebss - _bss); |
| 110 | free_mem_ptr = (unsigned long) _end; |
| 111 | free_mem_end_ptr = free_mem_ptr + HEAP_SIZE; |
| 112 | |
| 113 | __decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error); |
| 114 | return (unsigned long) output; |
| 115 | } |
| 116 | |