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
20unsigned 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
30static 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
38static 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
55static 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
71static 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
90static 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 */
106unsigned char *output_data;
107
108unsigned long free_mem_ptr;
109unsigned long free_mem_end_ptr;
110
111#ifndef arch_error
112#define arch_error(x)
113#endif
114
115void error(char *x)
116{
117	arch_error(x);
118
119	putstr("\n\n");
120	putstr(x);
121	putstr("\n\n -- System halted");
122
123	while(1);	/* Halt */
124}
125
126asmlinkage void __div0(void)
127{
128	error("Attempting division by 0!");
129}
130
131void
132decompress_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("Uncompressing Linux...");
149	ret = do_decompress(input_data, input_data_end - input_data,
150			    output_data, error);
151	if (ret)
152		error("decompressor returned an error");
153	else
154		putstr(" done, booting the kernel.\n");
155}
156
157void fortify_panic(const char *name)
158{
159	error("detected buffer overflow");
160}
161