Boot Linux faster!

Check our new training course

Boot Linux faster!

Check our new training course
and Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  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
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
/** @file
 *  @brief Byte order helpers.
 */

/*
 * Copyright (c) 2015-2016, Intel Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef ZEPHYR_INCLUDE_SYS_BYTEORDER_H_
#define ZEPHYR_INCLUDE_SYS_BYTEORDER_H_

#include <zephyr/types.h>
#include <stddef.h>
#include <sys/__assert.h>
#include <toolchain.h>

/* Internal helpers only used by the sys_* APIs further below */
#define __bswap_16(x) ((u16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
#define __bswap_24(x) ((u32_t) ((((x) >> 16) & 0xff) | \
				   (((x)) & 0xff00) | \
				   (((x) & 0xff) << 16)))
#define __bswap_32(x) ((u32_t) ((((x) >> 24) & 0xff) | \
				   (((x) >> 8) & 0xff00) | \
				   (((x) & 0xff00) << 8) | \
				   (((x) & 0xff) << 24)))
#define __bswap_48(x) ((u64_t) ((((x) >> 40) & 0xff) | \
				   (((x) >> 24) & 0xff00) | \
				   (((x) >> 8) & 0xff0000) | \
				   (((x) & 0xff0000) << 8) | \
				   (((x) & 0xff00) << 24) | \
				   (((x) & 0xff) << 40)))
#define __bswap_64(x) ((u64_t) ((((x) >> 56) & 0xff) | \
				   (((x) >> 40) & 0xff00) | \
				   (((x) >> 24) & 0xff0000) | \
				   (((x) >> 8) & 0xff000000) | \
				   (((x) & 0xff000000) << 8) | \
				   (((x) & 0xff0000) << 24) | \
				   (((x) & 0xff00) << 40) | \
				   (((x) & 0xff) << 56)))

/** @def sys_le16_to_cpu
 *  @brief Convert 16-bit integer from little-endian to host endianness.
 *
 *  @param val 16-bit integer in little-endian format.
 *
 *  @return 16-bit integer in host endianness.
 */

/** @def sys_cpu_to_le16
 *  @brief Convert 16-bit integer from host endianness to little-endian.
 *
 *  @param val 16-bit integer in host endianness.
 *
 *  @return 16-bit integer in little-endian format.
 */

/** @def sys_le24_to_cpu
 *  @brief Convert 24-bit integer from little-endian to host endianness.
 *
 *  @param val 24-bit integer in little-endian format.
 *
 *  @return 24-bit integer in host endianness.
 */

/** @def sys_cpu_to_le24
 *  @brief Convert 24-bit integer from host endianness to little-endian.
 *
 *  @param val 24-bit integer in host endianness.
 *
 *  @return 24-bit integer in little-endian format.
 */

/** @def sys_le32_to_cpu
 *  @brief Convert 32-bit integer from little-endian to host endianness.
 *
 *  @param val 32-bit integer in little-endian format.
 *
 *  @return 32-bit integer in host endianness.
 */

/** @def sys_cpu_to_le32
 *  @brief Convert 32-bit integer from host endianness to little-endian.
 *
 *  @param val 32-bit integer in host endianness.
 *
 *  @return 32-bit integer in little-endian format.
 */

/** @def sys_le48_to_cpu
 *  @brief Convert 48-bit integer from little-endian to host endianness.
 *
 *  @param val 48-bit integer in little-endian format.
 *
 *  @return 48-bit integer in host endianness.
 */

/** @def sys_cpu_to_le48
 *  @brief Convert 48-bit integer from host endianness to little-endian.
 *
 *  @param val 48-bit integer in host endianness.
 *
 *  @return 48-bit integer in little-endian format.
 */

/** @def sys_be16_to_cpu
 *  @brief Convert 16-bit integer from big-endian to host endianness.
 *
 *  @param val 16-bit integer in big-endian format.
 *
 *  @return 16-bit integer in host endianness.
 */

/** @def sys_cpu_to_be16
 *  @brief Convert 16-bit integer from host endianness to big-endian.
 *
 *  @param val 16-bit integer in host endianness.
 *
 *  @return 16-bit integer in big-endian format.
 */

/** @def sys_be24_to_cpu
 *  @brief Convert 24-bit integer from big-endian to host endianness.
 *
 *  @param val 24-bit integer in big-endian format.
 *
 *  @return 24-bit integer in host endianness.
 */

/** @def sys_cpu_to_be24
 *  @brief Convert 24-bit integer from host endianness to big-endian.
 *
 *  @param val 24-bit integer in host endianness.
 *
 *  @return 24-bit integer in big-endian format.
 */

/** @def sys_be32_to_cpu
 *  @brief Convert 32-bit integer from big-endian to host endianness.
 *
 *  @param val 32-bit integer in big-endian format.
 *
 *  @return 32-bit integer in host endianness.
 */

/** @def sys_cpu_to_be32
 *  @brief Convert 32-bit integer from host endianness to big-endian.
 *
 *  @param val 32-bit integer in host endianness.
 *
 *  @return 32-bit integer in big-endian format.
 */

/** @def sys_be48_to_cpu
 *  @brief Convert 48-bit integer from big-endian to host endianness.
 *
 *  @param val 48-bit integer in big-endian format.
 *
 *  @return 48-bit integer in host endianness.
 */

/** @def sys_cpu_to_be48
 *  @brief Convert 48-bit integer from host endianness to big-endian.
 *
 *  @param val 48-bit integer in host endianness.
 *
 *  @return 48-bit integer in big-endian format.
 */

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define sys_le16_to_cpu(val) (val)
#define sys_cpu_to_le16(val) (val)
#define sys_le24_to_cpu(val) (val)
#define sys_cpu_to_le24(val) (val)
#define sys_le32_to_cpu(val) (val)
#define sys_cpu_to_le32(val) (val)
#define sys_le48_to_cpu(val) (val)
#define sys_cpu_to_le48(val) (val)
#define sys_le64_to_cpu(val) (val)
#define sys_cpu_to_le64(val) (val)
#define sys_be16_to_cpu(val) __bswap_16(val)
#define sys_cpu_to_be16(val) __bswap_16(val)
#define sys_be24_to_cpu(val) __bswap_24(val)
#define sys_cpu_to_be24(val) __bswap_24(val)
#define sys_be32_to_cpu(val) __bswap_32(val)
#define sys_cpu_to_be32(val) __bswap_32(val)
#define sys_be48_to_cpu(val) __bswap_48(val)
#define sys_cpu_to_be48(val) __bswap_48(val)
#define sys_be64_to_cpu(val) __bswap_64(val)
#define sys_cpu_to_be64(val) __bswap_64(val)
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define sys_le16_to_cpu(val) __bswap_16(val)
#define sys_cpu_to_le16(val) __bswap_16(val)
#define sys_le24_to_cpu(val) __bswap_24(val)
#define sys_cpu_to_le24(val) __bswap_24(val)
#define sys_le32_to_cpu(val) __bswap_32(val)
#define sys_cpu_to_le32(val) __bswap_32(val)
#define sys_le48_to_cpu(val) __bswap_48(val)
#define sys_cpu_to_le48(val) __bswap_48(val)
#define sys_le64_to_cpu(val) __bswap_64(val)
#define sys_cpu_to_le64(val) __bswap_64(val)
#define sys_be16_to_cpu(val) (val)
#define sys_cpu_to_be16(val) (val)
#define sys_be24_to_cpu(val) (val)
#define sys_cpu_to_be24(val) (val)
#define sys_be32_to_cpu(val) (val)
#define sys_cpu_to_be32(val) (val)
#define sys_be48_to_cpu(val) (val)
#define sys_cpu_to_be48(val) (val)
#define sys_be64_to_cpu(val) (val)
#define sys_cpu_to_be64(val) (val)
#else
#error "Unknown byte order"
#endif

/**
 *  @brief Put a 16-bit integer as big-endian to arbitrary location.
 *
 *  Put a 16-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in big-endian format.
 *
 *  @param val 16-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_be16(u16_t val, u8_t dst[2])
{
	dst[0] = val >> 8;
	dst[1] = val;
}

/**
 *  @brief Put a 24-bit integer as big-endian to arbitrary location.
 *
 *  Put a 24-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in big-endian format.
 *
 *  @param val 24-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_be24(u32_t val, u8_t dst[3])
{
	dst[0] = val >> 16;
	sys_put_be16(val, &dst[1]);
}

/**
 *  @brief Put a 32-bit integer as big-endian to arbitrary location.
 *
 *  Put a 32-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in big-endian format.
 *
 *  @param val 32-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_be32(u32_t val, u8_t dst[4])
{
	sys_put_be16(val >> 16, dst);
	sys_put_be16(val, &dst[2]);
}

/**
 *  @brief Put a 48-bit integer as big-endian to arbitrary location.
 *
 *  Put a 48-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in big-endian format.
 *
 *  @param val 48-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_be48(u64_t val, u8_t dst[6])
{
	sys_put_be16(val >> 32, dst);
	sys_put_be32(val, &dst[2]);
}

/**
 *  @brief Put a 64-bit integer as big-endian to arbitrary location.
 *
 *  Put a 64-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in big-endian format.
 *
 *  @param val 64-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_be64(u64_t val, u8_t dst[8])
{
	sys_put_be32(val >> 32, dst);
	sys_put_be32(val, &dst[4]);
}

/**
 *  @brief Put a 16-bit integer as little-endian to arbitrary location.
 *
 *  Put a 16-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in little-endian format.
 *
 *  @param val 16-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_le16(u16_t val, u8_t dst[2])
{
	dst[0] = val;
	dst[1] = val >> 8;
}

/**
 *  @brief Put a 24-bit integer as little-endian to arbitrary location.
 *
 *  Put a 24-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in littel-endian format.
 *
 *  @param val 24-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_le24(u32_t val, u8_t dst[3])
{
	sys_put_le16(val, dst);
	dst[2] = val >> 16;
}

/**
 *  @brief Put a 32-bit integer as little-endian to arbitrary location.
 *
 *  Put a 32-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in little-endian format.
 *
 *  @param val 32-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_le32(u32_t val, u8_t dst[4])
{
	sys_put_le16(val, dst);
	sys_put_le16(val >> 16, &dst[2]);
}

/**
 *  @brief Put a 48-bit integer as little-endian to arbitrary location.
 *
 *  Put a 48-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in little-endian format.
 *
 *  @param val 48-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_le48(u64_t val, u8_t dst[6])
{
	sys_put_le32(val, dst);
	sys_put_le16(val >> 32, &dst[4]);
}

/**
 *  @brief Put a 64-bit integer as little-endian to arbitrary location.
 *
 *  Put a 64-bit integer, originally in host endianness, to a
 *  potentially unaligned memory location in little-endian format.
 *
 *  @param val 64-bit integer in host endianness.
 *  @param dst Destination memory address to store the result.
 */
static inline void sys_put_le64(u64_t val, u8_t dst[8])
{
	sys_put_le32(val, dst);
	sys_put_le32(val >> 32, &dst[4]);
}

/**
 *  @brief Get a 16-bit integer stored in big-endian format.
 *
 *  Get a 16-bit integer, stored in big-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the big-endian 16-bit integer to get.
 *
 *  @return 16-bit integer in host endianness.
 */
static inline u16_t sys_get_be16(const u8_t src[2])
{
	return ((u16_t)src[0] << 8) | src[1];
}

/**
 *  @brief Get a 24-bit integer stored in big-endian format.
 *
 *  Get a 24-bit integer, stored in big-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the big-endian 24-bit integer to get.
 *
 *  @return 24-bit integer in host endianness.
 */
static inline u32_t sys_get_be24(const u8_t src[3])
{
	return ((u32_t)src[0] << 16) | sys_get_be16(&src[1]);
}

/**
 *  @brief Get a 32-bit integer stored in big-endian format.
 *
 *  Get a 32-bit integer, stored in big-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the big-endian 32-bit integer to get.
 *
 *  @return 32-bit integer in host endianness.
 */
static inline u32_t sys_get_be32(const u8_t src[4])
{
	return ((u32_t)sys_get_be16(&src[0]) << 16) | sys_get_be16(&src[2]);
}

/**
 *  @brief Get a 48-bit integer stored in big-endian format.
 *
 *  Get a 48-bit integer, stored in big-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the big-endian 48-bit integer to get.
 *
 *  @return 48-bit integer in host endianness.
 */
static inline u64_t sys_get_be48(const u8_t src[6])
{
	return ((u64_t)sys_get_be32(&src[0]) << 32) | sys_get_be16(&src[4]);
}

/**
 *  @brief Get a 64-bit integer stored in big-endian format.
 *
 *  Get a 64-bit integer, stored in big-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the big-endian 64-bit integer to get.
 *
 *  @return 64-bit integer in host endianness.
 */
static inline u64_t sys_get_be64(const u8_t src[8])
{
	return ((u64_t)sys_get_be32(&src[0]) << 32) | sys_get_be32(&src[4]);
}

/**
 *  @brief Get a 16-bit integer stored in little-endian format.
 *
 *  Get a 16-bit integer, stored in little-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the little-endian 16-bit integer to get.
 *
 *  @return 16-bit integer in host endianness.
 */
static inline u16_t sys_get_le16(const u8_t src[2])
{
	return ((u16_t)src[1] << 8) | src[0];
}

/**
 *  @brief Get a 24-bit integer stored in big-endian format.
 *
 *  Get a 24-bit integer, stored in big-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the big-endian 24-bit integer to get.
 *
 *  @return 24-bit integer in host endianness.
 */
static inline u32_t sys_get_le24(const u8_t src[3])
{
	return ((u32_t)src[2] << 16) | sys_get_le16(&src[0]);
}

/**
 *  @brief Get a 32-bit integer stored in little-endian format.
 *
 *  Get a 32-bit integer, stored in little-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the little-endian 32-bit integer to get.
 *
 *  @return 32-bit integer in host endianness.
 */
static inline u32_t sys_get_le32(const u8_t src[4])
{
	return ((u32_t)sys_get_le16(&src[2]) << 16) | sys_get_le16(&src[0]);
}

/**
 *  @brief Get a 48-bit integer stored in little-endian format.
 *
 *  Get a 48-bit integer, stored in little-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the little-endian 48-bit integer to get.
 *
 *  @return 48-bit integer in host endianness.
 */
static inline u64_t sys_get_le48(const u8_t src[6])
{
	return ((u64_t)sys_get_le32(&src[2]) << 32) | sys_get_le16(&src[0]);
}

/**
 *  @brief Get a 64-bit integer stored in little-endian format.
 *
 *  Get a 64-bit integer, stored in little-endian format in a potentially
 *  unaligned memory location, and convert it to the host endianness.
 *
 *  @param src Location of the little-endian 64-bit integer to get.
 *
 *  @return 64-bit integer in host endianness.
 */
static inline u64_t sys_get_le64(const u8_t src[8])
{
	return ((u64_t)sys_get_le32(&src[4]) << 32) | sys_get_le32(&src[0]);
}

/**
 * @brief Swap one buffer content into another
 *
 * Copy the content of src buffer into dst buffer in reversed order,
 * i.e.: src[n] will be put in dst[end-n]
 * Where n is an index and 'end' the last index in both arrays.
 * The 2 memory pointers must be pointing to different areas, and have
 * a minimum size of given length.
 *
 * @param dst A valid pointer on a memory area where to copy the data in
 * @param src A valid pointer on a memory area where to copy the data from
 * @param length Size of both dst and src memory areas
 */
static inline void sys_memcpy_swap(void *dst, const void *src, size_t length)
{
	u8_t *pdst = (u8_t *)dst;
	const u8_t *psrc = (const u8_t *)src;

	__ASSERT(((psrc < pdst && (psrc + length) <= pdst) ||
		  (psrc > pdst && (pdst + length) <= psrc)),
		 "Source and destination buffers must not overlap");

	psrc += length - 1;

	for (; length > 0; length--) {
		*pdst++ = *psrc--;
	}
}

/**
 * @brief Swap buffer content
 *
 * In-place memory swap, where final content will be reversed.
 * I.e.: buf[n] will be put in buf[end-n]
 * Where n is an index and 'end' the last index of buf.
 *
 * @param buf A valid pointer on a memory area to swap
 * @param length Size of buf memory area
 */
static inline void sys_mem_swap(void *buf, size_t length)
{
	size_t i;

	for (i = 0; i < (length/2); i++) {
		u8_t tmp = ((u8_t *)buf)[i];

		((u8_t *)buf)[i] = ((u8_t *)buf)[length - 1 - i];
		((u8_t *)buf)[length - 1 - i] = tmp;
	}
}

#endif /* ZEPHYR_INCLUDE_SYS_BYTEORDER_H_ */