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 | #ifdef CONFIG_ARCH_EP93XX |
27 | #include "misc-ep93xx.h" |
28 | #endif |
29 | |
30 | static void putstr(const char *ptr); |
31 | |
32 | #include CONFIG_UNCOMPRESS_INCLUDE |
33 | |
34 | #ifdef CONFIG_DEBUG_ICEDCC |
35 | |
36 | #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7) |
37 | |
38 | static void icedcc_putc(int ch) |
39 | { |
40 | int status, i = 0x4000000; |
41 | |
42 | do { |
43 | if (--i < 0) |
44 | return; |
45 | |
46 | asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status)); |
47 | } while (status & (1 << 29)); |
48 | |
49 | asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch)); |
50 | } |
51 | |
52 | |
53 | #elif defined(CONFIG_CPU_XSCALE) |
54 | |
55 | static void icedcc_putc(int ch) |
56 | { |
57 | int status, i = 0x4000000; |
58 | |
59 | do { |
60 | if (--i < 0) |
61 | return; |
62 | |
63 | asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status)); |
64 | } while (status & (1 << 28)); |
65 | |
66 | asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch)); |
67 | } |
68 | |
69 | #else |
70 | |
71 | static void icedcc_putc(int ch) |
72 | { |
73 | int status, i = 0x4000000; |
74 | |
75 | do { |
76 | if (--i < 0) |
77 | return; |
78 | |
79 | asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status)); |
80 | } while (status & 2); |
81 | |
82 | asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch)); |
83 | } |
84 | |
85 | #endif |
86 | |
87 | #define putc(ch) icedcc_putc(ch) |
88 | #endif |
89 | |
90 | static void putstr(const char *ptr) |
91 | { |
92 | char c; |
93 | |
94 | while ((c = *ptr++) != '\0') { |
95 | if (c == '\n') |
96 | putc('\r'); |
97 | putc(c); |
98 | } |
99 | |
100 | flush(); |
101 | } |
102 | |
103 | /* |
104 | * gzip declarations |
105 | */ |
106 | unsigned char *output_data; |
107 | |
108 | unsigned long free_mem_ptr; |
109 | unsigned long free_mem_end_ptr; |
110 | |
111 | #ifndef arch_error |
112 | #define arch_error(x) |
113 | #endif |
114 | |
115 | void error(char *x) |
116 | { |
117 | arch_error(x); |
118 | |
119 | putstr(ptr: "\n\n" ); |
120 | putstr(ptr: x); |
121 | putstr(ptr: "\n\n -- System halted" ); |
122 | |
123 | while(1); /* Halt */ |
124 | } |
125 | |
126 | asmlinkage void __div0(void) |
127 | { |
128 | error(x: "Attempting division by 0!" ); |
129 | } |
130 | |
131 | void |
132 | decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, |
133 | unsigned long free_mem_ptr_end_p, |
134 | int arch_id) |
135 | { |
136 | int ret; |
137 | |
138 | output_data = (unsigned char *)output_start; |
139 | free_mem_ptr = free_mem_ptr_p; |
140 | free_mem_end_ptr = free_mem_ptr_end_p; |
141 | __machine_arch_type = arch_id; |
142 | |
143 | #ifdef CONFIG_ARCH_EP93XX |
144 | ep93xx_decomp_setup(); |
145 | #endif |
146 | arch_decomp_setup(); |
147 | |
148 | putstr(ptr: "Uncompressing Linux..." ); |
149 | ret = do_decompress(input: input_data, len: input_data_end - input_data, |
150 | output: output_data, error); |
151 | if (ret) |
152 | error(x: "decompressor returned an error" ); |
153 | else |
154 | putstr(ptr: " done, booting the kernel.\n" ); |
155 | } |
156 | |
157 | void __fortify_panic(const u8 reason, size_t avail, size_t size) |
158 | { |
159 | error(x: "detected buffer overflow" ); |
160 | } |
161 | |