summaryrefslogtreecommitdiff
path: root/arch/nios2/boot/compressed/misc.c
blob: 42fc4bbe18bb760c6b254c7f45284ba3d2e07438 (plain)
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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2009 Thomas Chou <thomas@wytron.com.tw>
 *
 * This is a collection of several routines from gzip-1.0.3
 * adapted for Linux.
 *
 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
 *
 * Adapted for SH by Stuart Menefy, Aug 1999
 *
 * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
 *
 * Based on arch/sh/boot/compressed/misc.c
 */

#include <linux/string.h>

/*
 * gzip declarations
 */
#define OF(args)  args
#define STATIC static

#undef memset
#undef memcpy
#define memzero(s, n)		memset((s), 0, (n))

typedef unsigned char  uch;
typedef unsigned short ush;
typedef unsigned long  ulg;
#define WSIZE 0x8000		/* Window size must be at least 32k, */
				/* and a power of two */

static uch *inbuf;		/* input buffer */
static uch window[WSIZE];	/* Sliding window buffer */

static unsigned insize;	/* valid bytes in inbuf */
static unsigned inptr;	/* index of next byte to be processed in inbuf */
static unsigned outcnt;	/* bytes in output buffer */

/* gzip flag byte */
#define ASCII_FLAG	0x01 /* bit 0 set: file probably ASCII text */
#define CONTINUATION	0x02 /* bit 1 set: continuation of multi-part gzip
				file */
#define EXTRA_FIELD	0x04 /* bit 2 set: extra field present */
#define ORIG_NAME	0x08 /* bit 3 set: original file name present */
#define COMMENT		0x10 /* bit 4 set: file comment present */
#define ENCRYPTED	0x20 /* bit 5 set: file is encrypted */
#define RESERVED	0xC0 /* bit 6,7:   reserved */

#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())

#ifdef DEBUG
#  define Assert(cond, msg) {if (!(cond)) error(msg); }
#  define Trace(x) fprintf x
#  define Tracev(x) {if (verbose) fprintf x ; }
#  define Tracevv(x) {if (verbose > 1) fprintf x ; }
#  define Tracec(c, x) {if (verbose && (c)) fprintf x ; }
#  define Tracecv(c, x) {if (verbose > 1 && (c)) fprintf x ; }
#else
#  define Assert(cond, msg)
#  define Trace(x)
#  define Tracev(x)
#  define Tracevv(x)
#  define Tracec(c, x)
#  define Tracecv(c, x)
#endif
static int  fill_inbuf(void);
static void flush_window(void);
static void error(char *m);

extern char input_data[];
extern int input_len;

static long bytes_out;
static uch *output_data;
static unsigned long output_ptr;

#include "console.c"

static void error(char *m);

int puts(const char *);

extern int _end;
static unsigned long free_mem_ptr;
static unsigned long free_mem_end_ptr;

#define HEAP_SIZE			0x10000

#include "../../../../lib/inflate.c"

void *memset(void *s, int c, size_t n)
{
	int i;
	char *ss = (char *)s;

	for (i = 0; i < n; i++)
		ss[i] = c;
	return s;
}

void *memcpy(void *__dest, __const void *__src, size_t __n)
{
	int i;
	char *d = (char *)__dest, *s = (char *)__src;

	for (i = 0; i < __n; i++)
		d[i] = s[i];
	return __dest;
}

/*
 * Fill the input buffer. This is called only when the buffer is empty
 * and at least one byte is really needed.
 */
static int fill_inbuf(void)
{
	if (insize != 0)
		error("ran out of input data");

	inbuf = input_data;
	insize = input_len;
	inptr = 1;
	return inbuf[0];
}

/*
 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 * (Used for the decompressed data only.)
 */
static void flush_window(void)
{
	ulg c = crc;	/* temporary variable */
	unsigned n;
	uch *in, *out, ch;

	in = window;
	out = &output_data[output_ptr];
	for (n = 0; n < outcnt; n++) {
		ch = *out++ = *in++;
		c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
	}
	crc = c;
	bytes_out += (ulg)outcnt;
	output_ptr += (ulg)outcnt;
	outcnt = 0;
}

static void error(char *x)
{
	puts("\nERROR\n");
	puts(x);
	puts("\n\n -- System halted");

	while (1)	/* Halt */
		;
}

void decompress_kernel(void)
{
	output_data = (void *) (CONFIG_NIOS2_MEM_BASE |
				CONFIG_NIOS2_KERNEL_REGION_BASE);
	output_ptr = 0;
	free_mem_ptr = (unsigned long)&_end;
	free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;

	console_init();
	makecrc();
	puts("Uncompressing Linux... ");
	gunzip();
	puts("Ok, booting the kernel.\n");
}