1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * 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 * Modified for ARM Linux by Russell King
11 *
12 * Nicolas Pitre <nico@visuaide.com> 1999/04/14 :
13 * For this code to run directly from Flash, all constant variables must
14 * be marked with 'const' and all other variables initialized at run-time
15 * only. This way all non constant variables will end up in the bss segment,
16 * which should point to addresses in RAM and cleared to 0 on start.
17 * This allows for a much quicker boot time.
18 */
19
20 unsigned int __machine_arch_type;
21
22 #include <linux/compiler.h> /* for inline */
23 #include <linux/types.h>
24 #include <linux/linkage.h>
25 #include "misc.h"
26 #include "misc-ep93xx.h"
27
28 static void putstr(const char *ptr);
29
30 #include CONFIG_UNCOMPRESS_INCLUDE
31
32 #ifdef CONFIG_DEBUG_ICEDCC
33
34 #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
35
icedcc_putc(int ch)36 static void icedcc_putc(int ch)
37 {
38 int status, i = 0x4000000;
39
40 do {
41 if (--i < 0)
42 return;
43
44 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
45 } while (status & (1 << 29));
46
47 asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
48 }
49
50
51 #elif defined(CONFIG_CPU_XSCALE)
52
icedcc_putc(int ch)53 static void icedcc_putc(int ch)
54 {
55 int status, i = 0x4000000;
56
57 do {
58 if (--i < 0)
59 return;
60
61 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
62 } while (status & (1 << 28));
63
64 asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
65 }
66
67 #else
68
icedcc_putc(int ch)69 static void icedcc_putc(int ch)
70 {
71 int status, i = 0x4000000;
72
73 do {
74 if (--i < 0)
75 return;
76
77 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
78 } while (status & 2);
79
80 asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
81 }
82
83 #endif
84
85 #define putc(ch) icedcc_putc(ch)
86 #endif
87
putstr(const char * ptr)88 static void putstr(const char *ptr)
89 {
90 char c;
91
92 while ((c = *ptr++) != '\0') {
93 if (c == '\n')
94 putc('\r');
95 putc(c);
96 }
97
98 flush();
99 }
100
101 /*
102 * gzip declarations
103 */
104 extern char input_data[];
105 extern char input_data_end[];
106
107 unsigned char *output_data;
108
109 unsigned long free_mem_ptr;
110 unsigned long free_mem_end_ptr;
111
112 #ifndef arch_error
113 #define arch_error(x)
114 #endif
115
error(char * x)116 void error(char *x)
117 {
118 arch_error(x);
119
120 putstr("\n\n");
121 putstr(x);
122 putstr("\n\n -- System halted");
123
124 while(1); /* Halt */
125 }
126
__div0(void)127 asmlinkage void __div0(void)
128 {
129 error("Attempting division by 0!");
130 }
131
132 extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
133
134
135 void
decompress_kernel(unsigned long output_start,unsigned long free_mem_ptr_p,unsigned long free_mem_ptr_end_p,int arch_id)136 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
137 unsigned long free_mem_ptr_end_p,
138 int arch_id)
139 {
140 int ret;
141
142 output_data = (unsigned char *)output_start;
143 free_mem_ptr = free_mem_ptr_p;
144 free_mem_end_ptr = free_mem_ptr_end_p;
145 __machine_arch_type = arch_id;
146
147 #ifdef CONFIG_ARCH_EP93XX
148 ep93xx_decomp_setup();
149 #endif
150 arch_decomp_setup();
151
152 putstr("Uncompressing Linux...");
153 ret = do_decompress(input_data, input_data_end - input_data,
154 output_data, error);
155 if (ret)
156 error("decompressor returned an error");
157 else
158 putstr(" done, booting the kernel.\n");
159 }
160
fortify_panic(const char * name)161 void fortify_panic(const char *name)
162 {
163 error("detected buffer overflow");
164 }
165