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 | ||
8e2872ce HC |
50 | #ifdef CONFIG_KERNEL_LZ4 |
51 | #include "../../../../lib/decompress_unlz4.c" | |
52 | #endif | |
53 | ||
1844c9bc MS |
54 | #ifdef CONFIG_KERNEL_LZMA |
55 | #include "../../../../lib/decompress_unlzma.c" | |
56 | #endif | |
57 | ||
cdf56649 HC |
58 | #ifdef CONFIG_KERNEL_LZO |
59 | #include "../../../../lib/decompress_unlzo.c" | |
60 | #endif | |
61 | ||
d7b081ac HC |
62 | #ifdef CONFIG_KERNEL_XZ |
63 | #include "../../../../lib/decompress_unxz.c" | |
64 | #endif | |
65 | ||
1844c9bc MS |
66 | extern _sclp_print_early(const char *); |
67 | ||
c4736d96 | 68 | static int puts(const char *s) |
1844c9bc MS |
69 | { |
70 | _sclp_print_early(s); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | void *memset(void *s, int c, size_t n) | |
75 | { | |
76 | char *xs; | |
77 | ||
535c611d HC |
78 | xs = s; |
79 | while (n--) | |
80 | *xs++ = c; | |
1844c9bc MS |
81 | return s; |
82 | } | |
83 | ||
535c611d | 84 | void *memcpy(void *dest, const void *src, size_t n) |
1844c9bc | 85 | { |
535c611d HC |
86 | const char *s = src; |
87 | char *d = dest; | |
88 | ||
89 | while (n--) | |
90 | *d++ = *s++; | |
91 | return dest; | |
1844c9bc MS |
92 | } |
93 | ||
535c611d | 94 | void *memmove(void *dest, const void *src, size_t n) |
1844c9bc | 95 | { |
535c611d HC |
96 | const char *s = src; |
97 | char *d = dest; | |
98 | ||
99 | if (d <= s) { | |
100 | while (n--) | |
101 | *d++ = *s++; | |
102 | } else { | |
103 | d += n; | |
104 | s += n; | |
105 | while (n--) | |
106 | *--d = *--s; | |
107 | } | |
108 | return dest; | |
1844c9bc MS |
109 | } |
110 | ||
111 | static void error(char *x) | |
112 | { | |
113 | unsigned long long psw = 0x000a0000deadbeefULL; | |
114 | ||
115 | puts("\n\n"); | |
116 | puts(x); | |
117 | puts("\n\n -- System halted"); | |
118 | ||
119 | asm volatile("lpsw %0" : : "Q" (psw)); | |
120 | } | |
121 | ||
122 | /* | |
123 | * Safe guard the ipl parameter block against a memory area that will be | |
124 | * overwritten. The validity check for the ipl parameter block is complex | |
125 | * (see cio_get_iplinfo and ipl_save_parameters) but if the pointer to | |
126 | * the ipl parameter block intersects with the passed memory area we can | |
127 | * safely assume that we can read from that memory. In that case just copy | |
128 | * the memory to IPL_PARMBLOCK_ORIGIN even if there is no ipl parameter | |
129 | * block. | |
130 | */ | |
131 | static void check_ipl_parmblock(void *start, unsigned long size) | |
132 | { | |
133 | void *src, *dst; | |
134 | ||
135 | src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr; | |
136 | if (src + PAGE_SIZE <= start || src >= start + size) | |
137 | return; | |
138 | dst = (void *) IPL_PARMBLOCK_ORIGIN; | |
139 | memmove(dst, src, PAGE_SIZE); | |
140 | S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN; | |
141 | } | |
142 | ||
143 | unsigned long decompress_kernel(void) | |
144 | { | |
145 | unsigned long output_addr; | |
146 | unsigned char *output; | |
147 | ||
a8c8d7c6 MS |
148 | output_addr = ((unsigned long) &_end + HEAP_SIZE + 4095UL) & -4096UL; |
149 | check_ipl_parmblock((void *) 0, output_addr + SZ__bss_start); | |
06c0dd72 | 150 | memset(&_bss, 0, &_ebss - &_bss); |
1844c9bc MS |
151 | free_mem_ptr = (unsigned long)&_end; |
152 | free_mem_end_ptr = free_mem_ptr + HEAP_SIZE; | |
a8c8d7c6 | 153 | output = (unsigned char *) output_addr; |
1844c9bc | 154 | |
1844c9bc MS |
155 | #ifdef CONFIG_BLK_DEV_INITRD |
156 | /* | |
157 | * Move the initrd right behind the end of the decompressed | |
158 | * kernel image. | |
159 | */ | |
160 | if (INITRD_START && INITRD_SIZE && | |
161 | INITRD_START < (unsigned long) output + SZ__bss_start) { | |
162 | check_ipl_parmblock(output + SZ__bss_start, | |
163 | INITRD_START + INITRD_SIZE); | |
164 | memmove(output + SZ__bss_start, | |
165 | (void *) INITRD_START, INITRD_SIZE); | |
166 | INITRD_START = (unsigned long) output + SZ__bss_start; | |
167 | } | |
168 | #endif | |
169 | ||
170 | puts("Uncompressing Linux... "); | |
171 | decompress(input_data, input_len, NULL, NULL, output, NULL, error); | |
172 | puts("Ok, booting the kernel.\n"); | |
173 | return (unsigned long) output; | |
174 | } | |
175 |