summaryrefslogtreecommitdiff
path: root/arch/s390/include/asm/bitops.h
blob: c467dffa8c12a5714d5aad1986bbf5cab801bbf0 (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
/* SPDX-License-Identifier: GPL-2.0 */
/*
 *    Copyright IBM Corp. 1999,2013
 *
 *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
 *
 * The description below was taken in large parts from the powerpc
 * bitops header file:
 * Within a word, bits are numbered LSB first.  Lot's of places make
 * this assumption by directly testing bits with (val & (1<<nr)).
 * This can cause confusion for large (> 1 word) bitmaps on a
 * big-endian system because, unlike little endian, the number of each
 * bit depends on the word size.
 *
 * The bitop functions are defined to work on unsigned longs, so the bits
 * end up numbered:
 *   |63..............0|127............64|191...........128|255...........192|
 *
 * We also have special functions which work with an MSB0 encoding.
 * The bits are numbered:
 *   |0..............63|64............127|128...........191|192...........255|
 *
 * The main difference is that bit 0-63 in the bit number field needs to be
 * reversed compared to the LSB0 encoded bit fields. This can be achieved by
 * XOR with 0x3f.
 *
 */

#ifndef _S390_BITOPS_H
#define _S390_BITOPS_H

#ifndef _LINUX_BITOPS_H
#error only <linux/bitops.h> can be included directly
#endif

#include <linux/typecheck.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include <asm/atomic_ops.h>
#include <asm/barrier.h>

#define __BITOPS_WORDS(bits) (((bits) + BITS_PER_LONG - 1) / BITS_PER_LONG)

static inline unsigned long *
__bitops_word(unsigned long nr, const volatile unsigned long *ptr)
{
	unsigned long addr;

	addr = (unsigned long)ptr + ((nr ^ (nr & (BITS_PER_LONG - 1))) >> 3);
	return (unsigned long *)addr;
}

static inline unsigned long __bitops_mask(unsigned long nr)
{
	return 1UL << (nr & (BITS_PER_LONG - 1));
}

static __always_inline void arch_set_bit(unsigned long nr, volatile unsigned long *ptr)
{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);

	__atomic64_or(mask, (long *)addr);
}

static __always_inline void arch_clear_bit(unsigned long nr, volatile unsigned long *ptr)
{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);

	__atomic64_and(~mask, (long *)addr);
}

static __always_inline void arch_change_bit(unsigned long nr,
					    volatile unsigned long *ptr)
{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);

	__atomic64_xor(mask, (long *)addr);
}

static inline bool arch_test_and_set_bit(unsigned long nr,
					 volatile unsigned long *ptr)
{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = __atomic64_or_barrier(mask, (long *)addr);
	return old & mask;
}

static inline bool arch_test_and_clear_bit(unsigned long nr,
					   volatile unsigned long *ptr)
{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = __atomic64_and_barrier(~mask, (long *)addr);
	return old & mask;
}

static inline bool arch_test_and_change_bit(unsigned long nr,
					    volatile unsigned long *ptr)
{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = __atomic64_xor_barrier(mask, (long *)addr);
	return old & mask;
}

static __always_inline void
arch___set_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);

	*p |= mask;
}

static __always_inline void
arch___clear_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);

	*p &= ~mask;
}

static __always_inline void
arch___change_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);

	*p ^= mask;
}

static __always_inline bool
arch___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = *p;
	*p |= mask;
	return old & mask;
}

static __always_inline bool
arch___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = *p;
	*p &= ~mask;
	return old & mask;
}

static __always_inline bool
arch___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = *p;
	*p ^= mask;
	return old & mask;
}

#define arch_test_bit generic_test_bit
#define arch_test_bit_acquire generic_test_bit_acquire

static inline bool arch_test_and_set_bit_lock(unsigned long nr,
					      volatile unsigned long *ptr)
{
	if (arch_test_bit(nr, ptr))
		return true;
	return arch_test_and_set_bit(nr, ptr);
}

static inline void arch_clear_bit_unlock(unsigned long nr,
					 volatile unsigned long *ptr)
{
	smp_mb__before_atomic();
	arch_clear_bit(nr, ptr);
}

static inline void arch___clear_bit_unlock(unsigned long nr,
					   volatile unsigned long *ptr)
{
	smp_mb();
	arch___clear_bit(nr, ptr);
}

static inline bool arch_xor_unlock_is_negative_byte(unsigned long mask,
		volatile unsigned long *ptr)
{
	unsigned long old;

	old = __atomic64_xor_barrier(mask, (long *)ptr);
	return old & BIT(7);
}
#define arch_xor_unlock_is_negative_byte arch_xor_unlock_is_negative_byte

#include <asm-generic/bitops/instrumented-atomic.h>
#include <asm-generic/bitops/instrumented-non-atomic.h>
#include <asm-generic/bitops/instrumented-lock.h>

/*
 * Functions which use MSB0 bit numbering.
 * The bits are numbered:
 *   |0..............63|64............127|128...........191|192...........255|
 */
unsigned long find_first_bit_inv(const unsigned long *addr, unsigned long size);
unsigned long find_next_bit_inv(const unsigned long *addr, unsigned long size,
				unsigned long offset);

#define for_each_set_bit_inv(bit, addr, size)				\
	for ((bit) = find_first_bit_inv((addr), (size));		\
	     (bit) < (size);						\
	     (bit) = find_next_bit_inv((addr), (size), (bit) + 1))

static inline void set_bit_inv(unsigned long nr, volatile unsigned long *ptr)
{
	return set_bit(nr ^ (BITS_PER_LONG - 1), ptr);
}

static inline void clear_bit_inv(unsigned long nr, volatile unsigned long *ptr)
{
	return clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
}

static inline bool test_and_clear_bit_inv(unsigned long nr,
					  volatile unsigned long *ptr)
{
	return test_and_clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
}

static inline void __set_bit_inv(unsigned long nr, volatile unsigned long *ptr)
{
	return __set_bit(nr ^ (BITS_PER_LONG - 1), ptr);
}

static inline void __clear_bit_inv(unsigned long nr, volatile unsigned long *ptr)
{
	return __clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
}

static inline bool test_bit_inv(unsigned long nr,
				const volatile unsigned long *ptr)
{
	return test_bit(nr ^ (BITS_PER_LONG - 1), ptr);
}

/**
 * __flogr - find leftmost one
 * @word - The word to search
 *
 * Returns the bit number of the most significant bit set,
 * where the most significant bit has bit number 0.
 * If no bit is set this function returns 64.
 */
static inline unsigned char __flogr(unsigned long word)
{
	if (__builtin_constant_p(word)) {
		unsigned long bit = 0;

		if (!word)
			return 64;
		if (!(word & 0xffffffff00000000UL)) {
			word <<= 32;
			bit += 32;
		}
		if (!(word & 0xffff000000000000UL)) {
			word <<= 16;
			bit += 16;
		}
		if (!(word & 0xff00000000000000UL)) {
			word <<= 8;
			bit += 8;
		}
		if (!(word & 0xf000000000000000UL)) {
			word <<= 4;
			bit += 4;
		}
		if (!(word & 0xc000000000000000UL)) {
			word <<= 2;
			bit += 2;
		}
		if (!(word & 0x8000000000000000UL)) {
			word <<= 1;
			bit += 1;
		}
		return bit;
	} else {
		union register_pair rp;

		rp.even = word;
		asm volatile(
			"       flogr   %[rp],%[rp]\n"
			: [rp] "+d" (rp.pair) : : "cc");
		return rp.even;
	}
}

/**
 * __ffs - find first bit in word.
 * @word: The word to search
 *
 * Undefined if no bit exists, so code should check against 0 first.
 */
static inline unsigned long __ffs(unsigned long word)
{
	return __flogr(-word & word) ^ (BITS_PER_LONG - 1);
}

/**
 * ffs - find first bit set
 * @word: the word to search
 *
 * This is defined the same way as the libc and
 * compiler builtin ffs routines (man ffs).
 */
static inline int ffs(int word)
{
	unsigned long mask = 2 * BITS_PER_LONG - 1;
	unsigned int val = (unsigned int)word;

	return (1 + (__flogr(-val & val) ^ (BITS_PER_LONG - 1))) & mask;
}

/**
 * __fls - find last (most-significant) set bit in a long word
 * @word: the word to search
 *
 * Undefined if no set bit exists, so code should check against 0 first.
 */
static inline unsigned long __fls(unsigned long word)
{
	return __flogr(word) ^ (BITS_PER_LONG - 1);
}

/**
 * fls64 - find last set bit in a 64-bit word
 * @word: the word to search
 *
 * This is defined in a similar way as the libc and compiler builtin
 * ffsll, but returns the position of the most significant set bit.
 *
 * fls64(value) returns 0 if value is 0 or the position of the last
 * set bit if value is nonzero. The last (most significant) bit is
 * at position 64.
 */
static inline int fls64(unsigned long word)
{
	unsigned long mask = 2 * BITS_PER_LONG - 1;

	return (1 + (__flogr(word) ^ (BITS_PER_LONG - 1))) & mask;
}

/**
 * fls - find last (most-significant) bit set
 * @word: the word to search
 *
 * This is defined the same way as ffs.
 * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
 */
static inline int fls(unsigned int word)
{
	return fls64(word);
}

#include <asm-generic/bitops/ffz.h>
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/le.h>
#include <asm-generic/bitops/ext2-atomic-setbit.h>

#endif /* _S390_BITOPS_H */