aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/boot/compressed/misc.c
blob: 8e2a8fca5ed205bcbfda7faafa1eb0d7628a863b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
/*
 * misc.c
 * 
 * This is a collection of several routines from gzip-1.0.3 
 * adapted for Linux.
 *
 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
 *
 * Modified for ARM Linux by Russell King
 *
 * Nicolas Pitre <nico@visuaide.com>  1999/04/14 :
 *  For this code to run directly from Flash, all constant variables must
 *  be marked with 'const' and all other variables initialized at run-time 
 *  only.  This way all non constant variables will end up in the bss segment,
 *  which should point to addresses in RAM and cleared to 0 on start.
 *  This allows for a much quicker boot time.
 */

unsigned int __machine_arch_type;

#include <linux/compiler.h>	/* for inline */
#include <linux/types.h>
#include <linux/linkage.h>

static void putstr(const char *ptr);
extern void error(char *x);

#include <mach/uncompress.h>

#ifdef CONFIG_DEBUG_ICEDCC

#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)

static void icedcc_putc(int ch)
{
	int status, i = 0x4000000;

	do {
		if (--i < 0)
			return;

		asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
	} while (status & (1 << 29));

	asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
}


#elif defined(CONFIG_CPU_XSCALE)

static void icedcc_putc(int ch)
{
	int status, i = 0x4000000;

	do {
		if (--i < 0)
			return;

		asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
	} while (status & (1 << 28));

	asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
}

#else

static void icedcc_putc(int ch)
{
	int status, i = 0x4000000;

	do {
		if (--i < 0)
			return;

		asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
	} while (status & 2);

	asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
}

#endif

#define putc(ch)	icedcc_putc(ch)
#endif

static void putstr(const char *ptr)
{
	char c;

	while ((c = *ptr++) != '\0') {
		if (c == '\n')
			putc('\r');
		putc(c);
	}

	flush();
}

/*
 * gzip declarations
 */
extern char input_data[];
extern char input_data_end[];

unsigned char *output_data;

unsigned long free_mem_ptr;
unsigned long free_mem_end_ptr;

#ifndef arch_error
#define arch_error(x)
#endif

void error(char *x)
{
	arch_error(x);

	putstr("\n\n");
	putstr(x);
	putstr("\n\n -- System halted");

	while(1);	/* Halt */
}

asmlinkage void __div0(void)
{
	error("Attempting division by 0!");
}

extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));


void
decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
		unsigned long free_mem_ptr_end_p,
		int arch_id)
{
	int ret;

	output_data		= (unsigned char *)output_start;
	free_mem_ptr		= free_mem_ptr_p;
	free_mem_end_ptr	= free_mem_ptr_end_p;
	__machine_arch_type	= arch_id;

	arch_decomp_setup();

	putstr("Uncompressing Linux...");
	ret = do_decompress(input_data, input_data_end - input_data,
			    output_data, error);
	if (ret)
		error("decompressor returned an error");
	else
		putstr(" done, booting the kernel.\n");
}