projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1844c9bc MS |
1 | /* |
| 2 | * Definitions and wrapper functions for kernel decompressor | |
| 3 | * | |
| 4 | * Copyright IBM Corp. 2010 | |
| 5 | * | |
| 6 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
| 7 | */ | |
| 8 | ||
| 9 | #include <asm/uaccess.h> | |
| 10 | #include <asm/page.h> | |
| 11 | #include <asm/ipl.h> | |
| 12 | #include "sizes.h" | |
| 13 | ||
| 14 | /* | |
| 15 | * gzip declarations | |
| 16 | */ | |
| 17 | #define STATIC static | |
| 18 | ||
| 19 | #undef memset | |
| 20 | #undef memcpy | |
| 21 | #undef memmove | |
| d7b081ac | 22 | #define memmove memmove |
| 1844c9bc MS |
23 | #define memzero(s, n) memset((s), 0, (n)) |
| 24 | ||
| 25 | /* Symbols defined by linker scripts */ | |
| 26 | extern char input_data[]; | |
| 27 | extern int input_len; | |
| 06c0dd72 MS |
28 | extern char _text, _end; |
| 29 | extern char _bss, _ebss; | |
| 1844c9bc MS |
30 | |
| 31 | static void error(char *m); | |
| 32 | ||
| 33 | static unsigned long free_mem_ptr; | |
| 34 | static unsigned long free_mem_end_ptr; | |
| 35 | ||
| 36 | #ifdef CONFIG_HAVE_KERNEL_BZIP2 | |
| 37 | #define HEAP_SIZE 0x400000 | |
| 38 | #else | |
| 39 | #define HEAP_SIZE 0x10000 | |
| 40 | #endif | |
| 41 | ||
| 42 | #ifdef CONFIG_KERNEL_GZIP | |
| 43 | #include "../../../../lib/decompress_inflate.c" | |
| 44 | #endif | |
| 45 | ||
| 46 | #ifdef CONFIG_KERNEL_BZIP2 | |
| 47 | #include "../../../../lib/decompress_bunzip2.c" | |
| 48 | #endif | |
| 49 | ||
| 50 | #ifdef CONFIG_KERNEL_LZMA | |
| 51 | #include "../../../../lib/decompress_unlzma.c" | |
| 52 | #endif | |
| 53 | ||
| cdf56649 HC |
54 | #ifdef CONFIG_KERNEL_LZO |
| 55 | #include "../../../../lib/decompress_unlzo.c" | |
| 56 | #endif | |
| 57 | ||
| d7b081ac HC |
58 | #ifdef CONFIG_KERNEL_XZ |
| 59 | #include "../../../../lib/decompress_unxz.c" | |
| 60 | #endif | |
| 61 | ||
| 1844c9bc MS |
62 | extern _sclp_print_early(const char *); |
| 63 | ||
| c4736d96 | 64 | static int puts(const char *s) |
| 1844c9bc MS |
65 | { |
| 66 | _sclp_print_early(s); | |
| 67 | return 0; | |
| 68 | } | |
| 69 | ||
| 70 | void *memset(void *s, int c, size_t n) | |
| 71 | { | |
| 72 | char *xs; | |
| 73 | ||
| 535c611d HC |
74 | xs = s; |
| 75 | while (n--) | |
| 76 | *xs++ = c; | |
| 1844c9bc MS |
77 | return s; |
| 78 | } | |
| 79 | ||
| 535c611d | 80 | void *memcpy(void *dest, const void *src, size_t n) |
| 1844c9bc | 81 | { |
| 535c611d HC |
82 | const char *s = src; |
| 83 | char *d = dest; | |
| 84 | ||
| 85 | while (n--) | |
| 86 | *d++ = *s++; | |
| 87 | return dest; | |
| 1844c9bc MS |
88 | } |
| 89 | ||
| 535c611d | 90 | void *memmove(void *dest, const void *src, size_t n) |
| 1844c9bc | 91 | { |
| 535c611d HC |
92 | const char *s = src; |
| 93 | char *d = dest; | |
| 94 | ||
| 95 | if (d <= s) { | |
| 96 | while (n--) | |
| 97 | *d++ = *s++; | |
| 98 | } else { | |
| 99 | d += n; | |
| 100 | s += n; | |
| 101 | while (n--) | |
| 102 | *--d = *--s; | |
| 103 | } | |
| 104 | return dest; | |
| 1844c9bc MS |
105 | } |
| 106 | ||
| 107 | static void error(char *x) | |
| 108 | { | |
| 109 | unsigned long long psw = 0x000a0000deadbeefULL; | |
| 110 | ||
| 111 | puts("\n\n"); | |
| 112 | puts(x); | |
| 113 | puts("\n\n -- System halted"); | |
| 114 | ||
| 115 | asm volatile("lpsw %0" : : "Q" (psw)); | |
| 116 | } | |
| 117 | ||
| 118 | /* | |
| 119 | * Safe guard the ipl parameter block against a memory area that will be | |
| 120 | * overwritten. The validity check for the ipl parameter block is complex | |
| 121 | * (see cio_get_iplinfo and ipl_save_parameters) but if the pointer to | |
| 122 | * the ipl parameter block intersects with the passed memory area we can | |
| 123 | * safely assume that we can read from that memory. In that case just copy | |
| 124 | * the memory to IPL_PARMBLOCK_ORIGIN even if there is no ipl parameter | |
| 125 | * block. | |
| 126 | */ | |
| 127 | static void check_ipl_parmblock(void *start, unsigned long size) | |
| 128 | { | |
| 129 | void *src, *dst; | |
| 130 | ||
| 131 | src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr; | |
| 132 | if (src + PAGE_SIZE <= start || src >= start + size) | |
| 133 | return; | |
| 134 | dst = (void *) IPL_PARMBLOCK_ORIGIN; | |
| 135 | memmove(dst, src, PAGE_SIZE); | |
| 136 | S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN; | |
| 137 | } | |
| 138 | ||
| 139 | unsigned long decompress_kernel(void) | |
| 140 | { | |
| 141 | unsigned long output_addr; | |
| 142 | unsigned char *output; | |
| 143 | ||
| a8c8d7c6 MS |
144 | output_addr = ((unsigned long) &_end + HEAP_SIZE + 4095UL) & -4096UL; |
| 145 | check_ipl_parmblock((void *) 0, output_addr + SZ__bss_start); | |
| 06c0dd72 | 146 | memset(&_bss, 0, &_ebss - &_bss); |
| 1844c9bc MS |
147 | free_mem_ptr = (unsigned long)&_end; |
| 148 | free_mem_end_ptr = free_mem_ptr + HEAP_SIZE; | |
| a8c8d7c6 | 149 | output = (unsigned char *) output_addr; |
| 1844c9bc | 150 | |
| 1844c9bc MS |
151 | #ifdef CONFIG_BLK_DEV_INITRD |
| 152 | /* | |
| 153 | * Move the initrd right behind the end of the decompressed | |
| 154 | * kernel image. | |
| 155 | */ | |
| 156 | if (INITRD_START && INITRD_SIZE && | |
| 157 | INITRD_START < (unsigned long) output + SZ__bss_start) { | |
| 158 | check_ipl_parmblock(output + SZ__bss_start, | |
| 159 | INITRD_START + INITRD_SIZE); | |
| 160 | memmove(output + SZ__bss_start, | |
| 161 | (void *) INITRD_START, INITRD_SIZE); | |
| 162 | INITRD_START = (unsigned long) output + SZ__bss_start; | |
| 163 | } | |
| 164 | #endif | |
| 165 | ||
| 166 | puts("Uncompressing Linux... "); | |
| 167 | decompress(input_data, input_len, NULL, NULL, output, NULL, error); | |
| 168 | puts("Ok, booting the kernel.\n"); | |
| 169 | return (unsigned long) output; | |
| 170 | } | |
| 171 |