glue.c revision 176481 
1/*-
2 * Copyright (c) 2007 Semihalf, Rafal Jaworowski <raj@semihalf.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/boot/uboot/lib/glue.c 176481 2008-02-23 17:56:17Z marcel $");
29
30#include <stand.h>
31#include "api_public.h"
32#include "glue.h"
33
34#define DEBUG
35#undef DEBUG
36
37#ifdef DEBUG
38#define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt,##args); } while (0)
39#else
40#define debugf(fmt, args...)
41#endif
42
43/* Some random address used by U-Boot. */
44extern long		uboot_address;
45
46/* crc32 stuff stolen from lib/libdisk/write_ia64_disk.c */
47static uint32_t crc32_tab[] = {
48	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
49	0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
50	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
51	0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
52	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
53	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
54	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
55	0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
56	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
57	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
58	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
59	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
60	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
61	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
62	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
63	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
64	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
65	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
66	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
67	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
68	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
69	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
70	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
71	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
72	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
73	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
74	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
75	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
76	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
77	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
78	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
79	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
80	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
81	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
82	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
83	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
84	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
85	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
86	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
87	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
88	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
89	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
90	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
91};
92
93static uint32_t
94crc32(const void *buf, size_t size)
95{
96	const uint8_t *p;
97	uint32_t crc;
98
99	p = buf;
100	crc = ~0U;
101
102	while (size--)
103		crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
104
105	return (crc ^ ~0U);
106}
107
108
109static int valid_sig(struct api_signature *sig)
110{
111	uint32_t checksum;
112	struct api_signature s;
113
114	if (sig == NULL)
115		return 0;
116	/*
117	 * Clear the checksum field (in the local copy) so as to calculate the
118	 * CRC with the same initial contents as at the time when the sig was
119	 * produced
120	 */
121	s = *sig;
122	s.checksum = 0;
123
124	checksum = crc32((void *)&s, sizeof(struct api_signature));
125
126	if (checksum != sig->checksum)
127		return 0;
128
129	return 1;
130}
131
132/*
133 * Searches for the U-Boot API signature
134 *
135 * returns 1/0 depending on found/not found result
136 */
137int api_search_sig(struct api_signature **sig) {
138
139	unsigned char *sp, *spend;
140
141	if (sig == NULL)
142		return 0;
143
144	if (uboot_address == 0)
145		uboot_address = 255 * 1024 * 1024;
146
147	sp = (void *)(uboot_address & ~0x000fffff);
148	spend = sp + 0x00100000 - API_SIG_MAGLEN;
149	while (sp < spend) {
150		if (!bcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) {
151			*sig = (struct api_signature *)sp;
152			if (valid_sig(*sig))
153				return 1;
154		}
155		sp += API_SIG_MAGLEN;
156	}
157
158	*sig = NULL;
159	return 0;
160}
161
162/****************************************
163 *
164 * console
165 *
166 ****************************************/
167
168int ub_getc(void)
169{
170	int c;
171
172	if (!syscall(API_GETC, NULL, (uint32_t)&c))
173		return -1;
174
175	return c;
176}
177
178int ub_tstc(void)
179{
180	int t;
181
182	if (!syscall(API_TSTC, NULL, (uint32_t)&t))
183		return -1;
184
185	return t;
186}
187
188void ub_putc(char c)
189{
190	syscall(API_PUTC, NULL, (uint32_t)&c);
191}
192
193void ub_puts(const char *s)
194{
195	syscall(API_PUTS, NULL, (uint32_t)s);
196}
197
198/****************************************
199 *
200 * system
201 *
202 ****************************************/
203
204void ub_reset(void)
205{
206	syscall(API_RESET, NULL);
207}
208
209
210#define MR_MAX 5
211static struct mem_region mr[MR_MAX];
212static struct sys_info si;
213
214struct sys_info * ub_get_sys_info(void)
215{
216	int err = 0;
217
218	memset(&si, 0, sizeof(struct sys_info));
219	si.mr = mr;
220	si.mr_no = MR_MAX;
221	memset(&mr, 0, sizeof(mr));
222
223	if (!syscall(API_GET_SYS_INFO, &err, (u_int32_t)&si))
224		return NULL;
225
226	return ((err) ? NULL : &si);
227}
228
229
230/****************************************
231 *
232 * timing
233 *
234 ****************************************/
235
236void ub_udelay(unsigned long usec)
237{
238	syscall(API_UDELAY, NULL, &usec);
239}
240
241unsigned long ub_get_timer(unsigned long base)
242{
243	unsigned long cur;
244
245	if (!syscall(API_GET_TIMER, NULL, &cur, &base))
246		return 0;
247
248	return cur;
249}
250
251
252/****************************************************************************
253 *
254 * devices
255 *
256 * Devices are identified by handles: numbers 0, 1, 2, ..., MAX_DEVS-1
257 *
258 ***************************************************************************/
259
260#define MAX_DEVS 6
261
262static struct device_info devices[MAX_DEVS];
263
264struct device_info * ub_dev_get(int i)
265{
266	return ((i < 0 || i >= MAX_DEVS) ? NULL : &devices[i]);
267}
268
269/*
270 * Enumerates the devices: fills out device_info elements in the devices[]
271 * array.
272 *
273 * returns:		number of devices found
274 */
275int ub_dev_enum(void)
276{
277	struct device_info *di;
278	int n = 0;
279
280	memset(&devices, 0, sizeof(struct device_info) * MAX_DEVS);
281	di = &devices[0];
282
283	if (!syscall(API_DEV_ENUM, NULL, di))
284		return 0;
285
286	while (di->cookie != NULL) {
287
288		if (++n >= MAX_DEVS)
289			break;
290
291		/* take another device_info */
292		di++;
293
294		/* pass on the previous cookie */
295		di->cookie = devices[n - 1].cookie;
296
297		if (!syscall(API_DEV_ENUM, NULL, di))
298			return 0;
299	}
300
301	return n;
302}
303
304
305/*
306 * handle:	0-based id of the device
307 *
308 * returns:	0 when OK, err otherwise
309 */
310int ub_dev_open(int handle)
311{
312	struct device_info *di;
313	int err = 0;
314
315	if (handle < 0 || handle >= MAX_DEVS)
316		return API_EINVAL;
317
318	di = &devices[handle];
319	if (!syscall(API_DEV_OPEN, &err, di))
320		return -1;
321
322	return err;
323}
324
325int ub_dev_close(int handle)
326{
327	struct device_info *di;
328
329	if (handle < 0 || handle >= MAX_DEVS)
330		return API_EINVAL;
331
332	di = &devices[handle];
333	if (!syscall(API_DEV_CLOSE, NULL, di))
334		return -1;
335
336	return 0;
337}
338
339/*
340 * Validates device for read/write, it has to:
341 *
342 * - have sane handle
343 * - be opened
344 *
345 * returns:	0/1 accordingly
346 */
347static int dev_valid(int handle)
348{
349	if (handle < 0 || handle >= MAX_DEVS)
350		return 0;
351
352	if (devices[handle].state != DEV_STA_OPEN)
353		return 0;
354
355	return 1;
356}
357
358static int dev_stor_valid(int handle)
359{
360	if (!dev_valid(handle))
361		return 0;
362
363	if (!(devices[handle].type & DEV_TYP_STOR))
364		return 0;
365
366	return 1;
367}
368
369int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start)
370{
371	struct device_info *di;
372	lbasize_t act_len;
373	int err = 0;
374
375	if (!dev_stor_valid(handle))
376		return API_ENODEV;
377
378	di = &devices[handle];
379	if (!syscall(API_DEV_READ, &err, di, buf, &len, &start, &act_len))
380		return -1;
381
382	if (err)
383		return err;
384
385	if (act_len != len)
386		return API_EIO;
387
388	return 0;
389}
390
391static int dev_net_valid(int handle)
392{
393	if (!dev_valid(handle))
394		return 0;
395
396	if (devices[handle].type != DEV_TYP_NET)
397		return 0;
398
399	return 1;
400}
401
402int ub_dev_recv(int handle, void *buf, int len)
403{
404	struct device_info *di;
405	int err = 0, act_len;
406
407	if (!dev_net_valid(handle))
408		return API_ENODEV;
409
410	di = &devices[handle];
411	if (!syscall(API_DEV_READ, &err, di, buf, &len, &act_len))
412		return -1;
413
414	if (err)
415		return -1;
416
417	return act_len;
418}
419
420int ub_dev_send(int handle, void *buf, int len)
421{
422	struct device_info *di;
423	int err = 0;
424
425	if (!dev_net_valid(handle))
426		return API_ENODEV;
427
428	di = &devices[handle];
429	if (!syscall(API_DEV_WRITE, &err, di, buf, &len))
430		return -1;
431
432	return err;
433}
434
435/****************************************
436 *
437 * env vars
438 *
439 ****************************************/
440
441char * ub_env_get(const char *name)
442{
443	char *value;
444
445	if (!syscall(API_ENV_GET, NULL, (uint32_t)name, (uint32_t)&value))
446		return NULL;
447
448	return value;
449}
450
451void ub_env_set(const char *name, char *value)
452{
453	syscall(API_ENV_SET, NULL, (uint32_t)name, (uint32_t)value);
454}
455
456
457static char env_name[256];
458
459const char * ub_env_enum(const char *last)
460{
461	const char *env, *str;
462	int i;
463
464	env = NULL;
465
466	/*
467	 * It's OK to pass only the name piece as last (and not the whole
468	 * 'name=val' string), since the API_ENUM_ENV call uses envmatch()
469	 * internally, which handles such case
470	 */
471	if (!syscall(API_ENV_ENUM, NULL, (uint32_t)last, (uint32_t)&env))
472		return NULL;
473
474	if (!env)
475		/* no more env. variables to enumerate */
476		return NULL;
477#if 0
478	if (last && strncmp(env, last, strlen(last)) == 0);
479		/* error, trying to enumerate non existing env. variable */
480		return NULL;
481#endif
482
483	/* next enumerated env var */
484	memset(env_name, 0, 256);
485	for (i = 0, str = env; *str != '=' && *str != '\0';)
486		env_name[i++] = *str++;
487
488	env_name[i] = '\0';
489
490	return env_name;
491}
492