1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * arch/sh/boot/compressed/misc.c
4  *
5  * This is a collection of several routines from gzip-1.0.3
6  * adapted for Linux.
7  *
8  * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
9  *
10  * Adapted for SH by Stuart Menefy, Aug 1999
11  *
12  * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
13  */
14 
15 #include <linux/uaccess.h>
16 #include <asm/addrspace.h>
17 #include <asm/page.h>
18 
19 /*
20  * gzip declarations
21  */
22 
23 #define STATIC static
24 
25 #undef memset
26 #undef memcpy
27 #define memzero(s, n)     memset ((s), 0, (n))
28 
29 /* cache.c */
30 #define CACHE_ENABLE      0
31 #define CACHE_DISABLE     1
32 int cache_control(unsigned int command);
33 
34 extern char input_data[];
35 extern int input_len;
36 static unsigned char *output;
37 
38 static void error(char *m);
39 
40 int puts(const char *);
41 
42 extern int _text;		/* Defined in vmlinux.lds.S */
43 extern int _end;
44 static unsigned long free_mem_ptr;
45 static unsigned long free_mem_end_ptr;
46 
47 #ifdef CONFIG_HAVE_KERNEL_BZIP2
48 #define HEAP_SIZE	0x400000
49 #else
50 #define HEAP_SIZE	0x10000
51 #endif
52 
53 #ifdef CONFIG_KERNEL_GZIP
54 #include "../../../../lib/decompress_inflate.c"
55 #endif
56 
57 #ifdef CONFIG_KERNEL_BZIP2
58 #include "../../../../lib/decompress_bunzip2.c"
59 #endif
60 
61 #ifdef CONFIG_KERNEL_LZMA
62 #include "../../../../lib/decompress_unlzma.c"
63 #endif
64 
65 #ifdef CONFIG_KERNEL_XZ
66 #include "../../../../lib/decompress_unxz.c"
67 #endif
68 
69 #ifdef CONFIG_KERNEL_LZO
70 #include "../../../../lib/decompress_unlzo.c"
71 #endif
72 
puts(const char * s)73 int puts(const char *s)
74 {
75 	/* This should be updated to use the sh-sci routines */
76 	return 0;
77 }
78 
memset(void * s,int c,size_t n)79 void* memset(void* s, int c, size_t n)
80 {
81 	int i;
82 	char *ss = (char*)s;
83 
84 	for (i=0;i<n;i++) ss[i] = c;
85 	return s;
86 }
87 
memcpy(void * __dest,__const void * __src,size_t __n)88 void* memcpy(void* __dest, __const void* __src,
89 			    size_t __n)
90 {
91 	int i;
92 	char *d = (char *)__dest, *s = (char *)__src;
93 
94 	for (i=0;i<__n;i++) d[i] = s[i];
95 	return __dest;
96 }
97 
error(char * x)98 static void error(char *x)
99 {
100 	puts("\n\n");
101 	puts(x);
102 	puts("\n\n -- System halted");
103 
104 	while(1);	/* Halt */
105 }
106 
107 const unsigned long __stack_chk_guard = 0x000a0dff;
108 
__stack_chk_fail(void)109 void __stack_chk_fail(void)
110 {
111 	error("stack-protector: Kernel stack is corrupted\n");
112 }
113 
114 /* Needed because vmlinux.lds.h references this */
ftrace_stub(void)115 void ftrace_stub(void)
116 {
117 }
arch_ftrace_ops_list_func(void)118 void arch_ftrace_ops_list_func(void)
119 {
120 }
121 
122 #define stackalign	4
123 
124 #define STACK_SIZE (4096)
125 long __attribute__ ((aligned(stackalign))) user_stack[STACK_SIZE];
126 long *stack_start = &user_stack[STACK_SIZE];
127 
decompress_kernel(void)128 void decompress_kernel(void)
129 {
130 	unsigned long output_addr;
131 
132 	output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
133 #if defined(CONFIG_29BIT)
134 	output_addr |= P2SEG;
135 #endif
136 
137 	output = (unsigned char *)output_addr;
138 	free_mem_ptr = (unsigned long)&_end;
139 	free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
140 
141 	puts("Uncompressing Linux... ");
142 	cache_control(CACHE_ENABLE);
143 	__decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
144 	cache_control(CACHE_DISABLE);
145 	puts("Ok, booting the kernel.\n");
146 }
147