summaryrefslogtreecommitdiffstats
path: root/arch/cris/arch-v10/boot/compressed/misc.c
blob: a4db1507d3b143e2cfb1d2a1ccce7b70dd47f027 (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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
/*
 * 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
 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
 * adaptation for Linux/CRIS Axis Communications AB, 1999
 *
 */

/* where the piggybacked kernel image expects itself to live.
 * it is the same address we use when we network load an uncompressed
 * image into DRAM, and it is the address the kernel is linked to live
 * at by vmlinux.lds.S
 */

#define KERNEL_LOAD_ADR 0x40004000


#include <linux/types.h>
#include <arch/svinto.h>

/*
 * gzip declarations
 */

#define OF(args)  args
#define STATIC static

void *memset(void *s, int c, size_t n);
void *memcpy(void *__dest, __const void *__src, size_t __n);

#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 */

unsigned inptr = 0;	/* index of next byte to be processed in inbuf
			 * After decompression it will contain the
			 * compressed size, and head.S will read it.
			 */

static unsigned outcnt = 0;  /* 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() (inbuf[inptr++])

/* Diagnostic functions */
#ifdef DEBUG
#  define Assert(cond, msg) do { \
		if (!(cond)) \
			error(msg); \
	} while (0)
#  define Trace(x) fprintf x
#  define Tracev(x) do { \
		if (verbose) \
			fprintf x; \
	} while (0)
#  define Tracevv(x) do { \
		if (verbose > 1) \
			fprintf x; \
	} while (0)
#  define Tracec(c, x) do { \
		if (verbose && (c)) \
			fprintf x; \
	} while (0)
#  define Tracecv(c, x) do { \
		if (verbose > 1 && (c)) \
			fprintf x; \
	} while (0)
#else
#  define Assert(cond, msg)
#  define Trace(x)
#  define Tracev(x)
#  define Tracevv(x)
#  define Tracec(c, x)
#  define Tracecv(c, x)
#endif

static void flush_window(void);
static void error(char *m);

extern char *input_data;  /* lives in head.S */

static long bytes_out = 0;
static uch *output_data;
static unsigned long output_ptr = 0;
static void puts(const char *);

/* the "heap" is put directly after the BSS ends, at end */

extern int _end;
static long free_mem_ptr = (long)&_end;
static long free_mem_end_ptr;

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

/* decompressor info and error messages to serial console */

static void
puts(const char *s)
{
#ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
	while (*s) {
#ifdef CONFIG_ETRAX_DEBUG_PORT0
		while (!(*R_SERIAL0_STATUS & (1 << 5))) ;
		*R_SERIAL0_TR_DATA = *s++;
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT1
		while (!(*R_SERIAL1_STATUS & (1 << 5))) ;
		*R_SERIAL1_TR_DATA = *s++;
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT2
		while (!(*R_SERIAL2_STATUS & (1 << 5))) ;
		*R_SERIAL2_TR_DATA = *s++;
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT3
		while (!(*R_SERIAL3_STATUS & (1 << 5))) ;
		*R_SERIAL3_TR_DATA = *s++;
#endif
	}
#endif
}

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;
}

/* ===========================================================================
 * 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;
		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("\n\n");
	puts(x);
	puts("\n\n -- System halted\n");

	while (1);	/* Halt */
}

void setup_normal_output_buffer(void)
{
	output_data = (char *)KERNEL_LOAD_ADR;
}

void decompress_kernel(void)
{
	char revision;

	/* input_data is set in head.S */
	inbuf = input_data;

#ifdef CONFIG_ETRAX_DEBUG_PORT0
	*R_SERIAL0_XOFF = 0;
	*R_SERIAL0_BAUD = 0x99;
	*R_SERIAL0_TR_CTRL = 0x40;
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT1
	*R_SERIAL1_XOFF = 0;
	*R_SERIAL1_BAUD = 0x99;
	*R_SERIAL1_TR_CTRL = 0x40;
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT2
	*R_GEN_CONFIG = 0x08;
	*R_SERIAL2_XOFF = 0;
	*R_SERIAL2_BAUD = 0x99;
	*R_SERIAL2_TR_CTRL = 0x40;
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT3
	*R_GEN_CONFIG = 0x100;
	*R_SERIAL3_XOFF = 0;
	*R_SERIAL3_BAUD = 0x99;
	*R_SERIAL3_TR_CTRL = 0x40;
#endif

	setup_normal_output_buffer();

	makecrc();

	__asm__ volatile ("move $vr,%0" : "=rm" (revision));
	if (revision < 10) {
		puts("You need an ETRAX 100LX to run linux 2.6\n");
		while (1);
	}

	puts("Uncompressing Linux...\n");
	gunzip();
	puts("Done. Now booting the kernel.\n");
}