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