aboutsummaryrefslogtreecommitdiff
path: root/arch/mn10300/boot/compressed/misc.c
blob: f673383518e4cf26e42b42a6389a6b40b2e29440 (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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
/* MN10300 Miscellaneous helper routines for kernel decompressor
 *
 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Modified by David Howells (dhowells@redhat.com)
 * - Derived from arch/x86/boot/compressed/misc_32.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/compiler.h>
#include <asm/serial-regs.h>
#include "misc.h"

#ifndef CONFIG_GDBSTUB_ON_TTYSx
/* display 'Uncompressing Linux... ' messages on ttyS0 or ttyS1 */
#if 1	/* ttyS0 */
#define CYG_DEV_BASE	0xA6FB0000
#else   /* ttyS1 */
#define CYG_DEV_BASE	0xA6FC0000
#endif

#define CYG_DEV_THR	(*((volatile __u8*)(CYG_DEV_BASE + 0x00)))
#define CYG_DEV_MCR	(*((volatile __u8*)(CYG_DEV_BASE + 0x10)))
#define SIO_MCR_DTR	0x01
#define SIO_MCR_RTS	0x02
#define CYG_DEV_LSR	(*((volatile __u8*)(CYG_DEV_BASE + 0x14)))
#define SIO_LSR_THRE	0x20		/* transmitter holding register empty */
#define SIO_LSR_TEMT	0x40		/* transmitter register empty */
#define CYG_DEV_MSR	(*((volatile __u8*)(CYG_DEV_BASE + 0x18)))
#define SIO_MSR_CTS	0x10		/* clear to send */
#define SIO_MSR_DSR	0x20		/* data set ready */

#define LSR_WAIT_FOR(STATE) \
	do { while (!(CYG_DEV_LSR & SIO_LSR_##STATE)) {} } while (0)
#define FLOWCTL_QUERY(LINE) \
	({ CYG_DEV_MSR & SIO_MSR_##LINE; })
#define FLOWCTL_WAIT_FOR(LINE) \
	do { while (!(CYG_DEV_MSR & SIO_MSR_##LINE)) {} } while (0)
#define FLOWCTL_CLEAR(LINE) \
	do { CYG_DEV_MCR &= ~SIO_MCR_##LINE; } while (0)
#define FLOWCTL_SET(LINE) \
	do { CYG_DEV_MCR |= SIO_MCR_##LINE; } while (0)
#endif

/*
 * gzip declarations
 */

#define OF(args)  args
#define STATIC static

#undef memset
#undef memcpy

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

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

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

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

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

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 */

/* Diagnostic functions */
#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(const char *) __attribute__((noreturn));
static void kputs(const char *);

static inline unsigned char get_byte(void)
{
	unsigned char ch = inptr < insize ? inbuf[inptr++] : fill_inbuf();

#if 0
	char hex[3];
	hex[0] = ((ch & 0x0f) > 9) ?
		((ch & 0x0f) + 'A' - 0xa) : ((ch & 0x0f) + '0');
	hex[1] = ((ch >> 4) > 9) ?
		((ch >> 4) + 'A' - 0xa) : ((ch >> 4) + '0');
	hex[2] = 0;
	kputs(hex);
#endif
	return ch;
}

/*
 * This is set up by the setup-routine at boot-time
 */
#define EXT_MEM_K (*(unsigned short *)0x90002)
#ifndef STANDARD_MEMORY_BIOS_CALL
#define ALT_MEM_K (*(unsigned long *) 0x901e0)
#endif
#define SCREEN_INFO (*(struct screen_info *)0x90000)

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


static unsigned long free_mem_ptr = (unsigned long) &end;
static unsigned long free_mem_end_ptr = (unsigned long) &end + 0x90000;

#define INPLACE_MOVE_ROUTINE	0x1000
#define LOW_BUFFER_START	0x2000
#define LOW_BUFFER_END		0x90000
#define LOW_BUFFER_SIZE		(LOW_BUFFER_END - LOW_BUFFER_START)
#define HEAP_SIZE		0x3000
static int high_loaded;
static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;

static char *vidmem = (char *)0xb8000;
static int lines, cols;

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

static inline void scroll(void)
{
	int i;

	memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
	for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
		vidmem[i] = ' ';
}

static inline void kputchar(unsigned char ch)
{
#ifdef CONFIG_MN10300_UNIT_ASB2305
	while (SC0STR & SC01STR_TBF)
		continue;

	if (ch == 0x0a) {
		SC0TXB = 0x0d;
		while (SC0STR & SC01STR_TBF)
			continue;
	}

	SC0TXB = ch;

#else
	while (SC1STR & SC01STR_TBF)
		continue;

	if (ch == 0x0a) {
		SC1TXB = 0x0d;
		while (SC1STR & SC01STR_TBF)
			continue;
	}

	SC1TXB = ch;

#endif
}

static void kputs(const char *s)
{
#ifdef CONFIG_DEBUG_DECOMPRESS_KERNEL
#ifndef CONFIG_GDBSTUB_ON_TTYSx
	char ch;

	FLOWCTL_SET(DTR);

	while (*s) {
		LSR_WAIT_FOR(THRE);

		ch = *s++;
		if (ch == 0x0a) {
			CYG_DEV_THR = 0x0d;
			LSR_WAIT_FOR(THRE);
		}
		CYG_DEV_THR = ch;
	}

	FLOWCTL_CLEAR(DTR);
#else

	for (; *s; s++)
		kputchar(*s);

#endif
#endif /* CONFIG_DEBUG_DECOMPRESS_KERNEL */
}

/* ===========================================================================
 * 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()
{
	if (insize != 0)
		error("ran out of input data\n");

	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_low(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 flush_window_high(void)
{
    ulg c = crc;         /* temporary variable */
    unsigned n;
    uch *in,  ch;
    in = window;
    for (n = 0; n < outcnt; n++) {
	ch = *output_data++ = *in++;
	if ((ulg) output_data == LOW_BUFFER_END)
		output_data = high_buffer_start;
	c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
    }
    crc = c;
    bytes_out += (ulg)outcnt;
    outcnt = 0;
}

static void flush_window(void)
{
	if (high_loaded)
		flush_window_high();
	else
		flush_window_low();
}

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

	while (1)
		/* Halt */;
}

#define STACK_SIZE (4096)

long user_stack[STACK_SIZE];

struct {
	long *a;
	short b;
} stack_start = { &user_stack[STACK_SIZE], 0 };

void setup_normal_output_buffer(void)
{
#ifdef STANDARD_MEMORY_BIOS_CALL
	if (EXT_MEM_K < 1024)
		error("Less than 2MB of memory.\n");
#else
	if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < 1024)
		error("Less than 2MB of memory.\n");
#endif
	output_data = (char *) 0x100000; /* Points to 1M */
}

struct moveparams {
	uch *low_buffer_start;
	int lcount;
	uch *high_buffer_start;
	int hcount;
};

void setup_output_buffer_if_we_run_high(struct moveparams *mv)
{
	high_buffer_start = (uch *)(((ulg) &end) + HEAP_SIZE);
#ifdef STANDARD_MEMORY_BIOS_CALL
	if (EXT_MEM_K < (3 * 1024))
		error("Less than 4MB of memory.\n");
#else
	if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < (3 * 1024))
		error("Less than 4MB of memory.\n");
#endif
	mv->low_buffer_start = output_data = (char *) LOW_BUFFER_START;
	high_loaded = 1;
	free_mem_end_ptr = (long) high_buffer_start;
	if (0x100000 + LOW_BUFFER_SIZE > (ulg) high_buffer_start) {
		high_buffer_start = (uch *)(0x100000 + LOW_BUFFER_SIZE);
		mv->hcount = 0; /* say: we need not to move high_buffer */
	} else {
		mv->hcount = -1;
	}
	mv->high_buffer_start = high_buffer_start;
}

void close_output_buffer_if_we_run_high(struct moveparams *mv)
{
	mv->lcount = bytes_out;
	if (bytes_out > LOW_BUFFER_SIZE) {
		mv->lcount = LOW_BUFFER_SIZE;
		if (mv->hcount)
			mv->hcount = bytes_out - LOW_BUFFER_SIZE;
	} else {
		mv->hcount = 0;
	}
}

#undef DEBUGFLAG
#ifdef DEBUGFLAG
int debugflag;
#endif

int decompress_kernel(struct moveparams *mv)
{
#ifdef DEBUGFLAG
	while (!debugflag)
		barrier();
#endif

	output_data = (char *) CONFIG_KERNEL_TEXT_ADDRESS;

	makecrc();
	kputs("Uncompressing Linux... ");
	gunzip();
	kputs("Ok, booting the kernel.\n");
	return 0;
}