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Commit | Line | Data |
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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 | ||
7c0f6ba6 | 9 | #include <linux/uaccess.h> |
1844c9bc | 10 | #include <asm/page.h> |
fbf87dff | 11 | #include <asm/sclp.h> |
1844c9bc MS |
12 | #include <asm/ipl.h> |
13 | #include "sizes.h" | |
14 | ||
15 | /* | |
16 | * gzip declarations | |
17 | */ | |
18 | #define STATIC static | |
19 | ||
20 | #undef memset | |
21 | #undef memcpy | |
22 | #undef memmove | |
d7b081ac | 23 | #define memmove memmove |
1844c9bc MS |
24 | #define memzero(s, n) memset((s), 0, (n)) |
25 | ||
26 | /* Symbols defined by linker scripts */ | |
27 | extern char input_data[]; | |
28 | extern int input_len; | |
06c0dd72 MS |
29 | extern char _text, _end; |
30 | extern char _bss, _ebss; | |
1844c9bc MS |
31 | |
32 | static void error(char *m); | |
33 | ||
34 | static unsigned long free_mem_ptr; | |
35 | static unsigned long free_mem_end_ptr; | |
36 | ||
37 | #ifdef CONFIG_HAVE_KERNEL_BZIP2 | |
38 | #define HEAP_SIZE 0x400000 | |
39 | #else | |
40 | #define HEAP_SIZE 0x10000 | |
41 | #endif | |
42 | ||
43 | #ifdef CONFIG_KERNEL_GZIP | |
44 | #include "../../../../lib/decompress_inflate.c" | |
45 | #endif | |
46 | ||
47 | #ifdef CONFIG_KERNEL_BZIP2 | |
48 | #include "../../../../lib/decompress_bunzip2.c" | |
49 | #endif | |
50 | ||
8e2872ce HC |
51 | #ifdef CONFIG_KERNEL_LZ4 |
52 | #include "../../../../lib/decompress_unlz4.c" | |
53 | #endif | |
54 | ||
1844c9bc MS |
55 | #ifdef CONFIG_KERNEL_LZMA |
56 | #include "../../../../lib/decompress_unlzma.c" | |
57 | #endif | |
58 | ||
cdf56649 HC |
59 | #ifdef CONFIG_KERNEL_LZO |
60 | #include "../../../../lib/decompress_unlzo.c" | |
61 | #endif | |
62 | ||
d7b081ac HC |
63 | #ifdef CONFIG_KERNEL_XZ |
64 | #include "../../../../lib/decompress_unxz.c" | |
65 | #endif | |
66 | ||
c4736d96 | 67 | static int puts(const char *s) |
1844c9bc | 68 | { |
d5ab7a34 | 69 | sclp_early_printk(s); |
1844c9bc MS |
70 | return 0; |
71 | } | |
72 | ||
73 | void *memset(void *s, int c, size_t n) | |
74 | { | |
75 | char *xs; | |
76 | ||
535c611d HC |
77 | xs = s; |
78 | while (n--) | |
79 | *xs++ = c; | |
1844c9bc MS |
80 | return s; |
81 | } | |
82 | ||
535c611d | 83 | void *memcpy(void *dest, const void *src, size_t n) |
1844c9bc | 84 | { |
535c611d HC |
85 | const char *s = src; |
86 | char *d = dest; | |
87 | ||
88 | while (n--) | |
89 | *d++ = *s++; | |
90 | return dest; | |
1844c9bc MS |
91 | } |
92 | ||
535c611d | 93 | void *memmove(void *dest, const void *src, size_t n) |
1844c9bc | 94 | { |
535c611d HC |
95 | const char *s = src; |
96 | char *d = dest; | |
97 | ||
98 | if (d <= s) { | |
99 | while (n--) | |
100 | *d++ = *s++; | |
101 | } else { | |
102 | d += n; | |
103 | s += n; | |
104 | while (n--) | |
105 | *--d = *--s; | |
106 | } | |
107 | return dest; | |
1844c9bc MS |
108 | } |
109 | ||
110 | static void error(char *x) | |
111 | { | |
112 | unsigned long long psw = 0x000a0000deadbeefULL; | |
113 | ||
114 | puts("\n\n"); | |
115 | puts(x); | |
116 | puts("\n\n -- System halted"); | |
117 | ||
118 | asm volatile("lpsw %0" : : "Q" (psw)); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Safe guard the ipl parameter block against a memory area that will be | |
123 | * overwritten. The validity check for the ipl parameter block is complex | |
124 | * (see cio_get_iplinfo and ipl_save_parameters) but if the pointer to | |
125 | * the ipl parameter block intersects with the passed memory area we can | |
126 | * safely assume that we can read from that memory. In that case just copy | |
127 | * the memory to IPL_PARMBLOCK_ORIGIN even if there is no ipl parameter | |
128 | * block. | |
129 | */ | |
130 | static void check_ipl_parmblock(void *start, unsigned long size) | |
131 | { | |
132 | void *src, *dst; | |
133 | ||
134 | src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr; | |
135 | if (src + PAGE_SIZE <= start || src >= start + size) | |
136 | return; | |
137 | dst = (void *) IPL_PARMBLOCK_ORIGIN; | |
138 | memmove(dst, src, PAGE_SIZE); | |
139 | S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN; | |
140 | } | |
141 | ||
142 | unsigned long decompress_kernel(void) | |
143 | { | |
d82c0d12 | 144 | void *output, *kernel_end; |
1844c9bc | 145 | |
d82c0d12 MHC |
146 | output = (void *) ALIGN((unsigned long) &_end + HEAP_SIZE, PAGE_SIZE); |
147 | kernel_end = output + SZ__bss_start; | |
148 | check_ipl_parmblock((void *) 0, (unsigned long) kernel_end); | |
1844c9bc | 149 | |
1844c9bc MS |
150 | #ifdef CONFIG_BLK_DEV_INITRD |
151 | /* | |
152 | * Move the initrd right behind the end of the decompressed | |
d82c0d12 MHC |
153 | * kernel image. This also prevents initrd corruption caused by |
154 | * bss clearing since kernel_end will always be located behind the | |
155 | * current bss section.. | |
1844c9bc | 156 | */ |
d82c0d12 MHC |
157 | if (INITRD_START && INITRD_SIZE && kernel_end > (void *) INITRD_START) { |
158 | check_ipl_parmblock(kernel_end, INITRD_SIZE); | |
159 | memmove(kernel_end, (void *) INITRD_START, INITRD_SIZE); | |
160 | INITRD_START = (unsigned long) kernel_end; | |
1844c9bc MS |
161 | } |
162 | #endif | |
163 | ||
d82c0d12 MHC |
164 | /* |
165 | * Clear bss section. free_mem_ptr and free_mem_end_ptr need to be | |
166 | * initialized afterwards since they reside in bss. | |
167 | */ | |
168 | memset(&_bss, 0, &_ebss - &_bss); | |
169 | free_mem_ptr = (unsigned long) &_end; | |
170 | free_mem_end_ptr = free_mem_ptr + HEAP_SIZE; | |
171 | ||
1844c9bc | 172 | puts("Uncompressing Linux... "); |
2d3862d2 | 173 | __decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error); |
1844c9bc MS |
174 | puts("Ok, booting the kernel.\n"); |
175 | return (unsigned long) output; | |
176 | } | |
177 |