aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-m68k/bitops.h
blob: e845daac48ad40aa05eba607ccecc615e60e6ab8 (plain) (blame)
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
#ifndef _M68K_BITOPS_H
#define _M68K_BITOPS_H
/*
 * Copyright 1992, Linus Torvalds.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/compiler.h>

/*
 * Require 68020 or better.
 *
 * They use the standard big-endian m680x0 bit ordering.
 */

#define test_and_set_bit(nr,vaddr) \
  (__builtin_constant_p(nr) ? \
   __constant_test_and_set_bit(nr, vaddr) : \
   __generic_test_and_set_bit(nr, vaddr))

#define __test_and_set_bit(nr,vaddr) test_and_set_bit(nr,vaddr)

static inline int __constant_test_and_set_bit(int nr, unsigned long *vaddr)
{
	char *p = (char *)vaddr + (nr ^ 31) / 8;
	char retval;

	__asm__ __volatile__ ("bset %2,%1; sne %0"
			: "=d" (retval), "+m" (*p)
			: "di" (nr & 7));

	return retval;
}

static inline int __generic_test_and_set_bit(int nr, unsigned long *vaddr)
{
	char retval;

	__asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
			: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");

	return retval;
}

#define set_bit(nr,vaddr) \
  (__builtin_constant_p(nr) ? \
   __constant_set_bit(nr, vaddr) : \
   __generic_set_bit(nr, vaddr))

#define __set_bit(nr,vaddr) set_bit(nr,vaddr)

static inline void __constant_set_bit(int nr, volatile unsigned long *vaddr)
{
	char *p = (char *)vaddr + (nr ^ 31) / 8;
	__asm__ __volatile__ ("bset %1,%0"
			: "+m" (*p) : "di" (nr & 7));
}

static inline void __generic_set_bit(int nr, volatile unsigned long *vaddr)
{
	__asm__ __volatile__ ("bfset %1{%0:#1}"
			: : "d" (nr^31), "o" (*vaddr) : "memory");
}

#define test_and_clear_bit(nr,vaddr) \
  (__builtin_constant_p(nr) ? \
   __constant_test_and_clear_bit(nr, vaddr) : \
   __generic_test_and_clear_bit(nr, vaddr))

#define __test_and_clear_bit(nr,vaddr) test_and_clear_bit(nr,vaddr)

static inline int __constant_test_and_clear_bit(int nr, unsigned long *vaddr)
{
	char *p = (char *)vaddr + (nr ^ 31) / 8;
	char retval;

	__asm__ __volatile__ ("bclr %2,%1; sne %0"
			: "=d" (retval), "+m" (*p)
			: "di" (nr & 7));

	return retval;
}

static inline int __generic_test_and_clear_bit(int nr, unsigned long *vaddr)
{
	char retval;

	__asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
			: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");

	return retval;
}

/*
 * clear_bit() doesn't provide any barrier for the compiler.
 */
#define smp_mb__before_clear_bit()	barrier()
#define smp_mb__after_clear_bit()	barrier()

#define clear_bit(nr,vaddr) \
  (__builtin_constant_p(nr) ? \
   __constant_clear_bit(nr, vaddr) : \
   __generic_clear_bit(nr, vaddr))
#define __clear_bit(nr,vaddr) clear_bit(nr,vaddr)

static inline void __constant_clear_bit(int nr, volatile unsigned long *vaddr)
{
	char *p = (char *)vaddr + (nr ^ 31) / 8;
	__asm__ __volatile__ ("bclr %1,%0"
			: "+m" (*p) : "di" (nr & 7));
}

static inline void __generic_clear_bit(int nr, volatile unsigned long *vaddr)
{
	__asm__ __volatile__ ("bfclr %1{%0:#1}"
			: : "d" (nr^31), "o" (*vaddr) : "memory");
}

#define test_and_change_bit(nr,vaddr) \
  (__builtin_constant_p(nr) ? \
   __constant_test_and_change_bit(nr, vaddr) : \
   __generic_test_and_change_bit(nr, vaddr))

#define __test_and_change_bit(nr,vaddr) test_and_change_bit(nr,vaddr)
#define __change_bit(nr,vaddr) change_bit(nr,vaddr)

static inline int __constant_test_and_change_bit(int nr, unsigned long *vaddr)
{
	char *p = (char *)vaddr + (nr ^ 31) / 8;
	char retval;

	__asm__ __volatile__ ("bchg %2,%1; sne %0"
			: "=d" (retval), "+m" (*p)
			: "di" (nr & 7));

	return retval;
}

static inline int __generic_test_and_change_bit(int nr, unsigned long *vaddr)
{
	char retval;

	__asm__ __volatile__ ("bfchg %2{%1:#1}; sne %0"
			: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");

	return retval;
}

#define change_bit(nr,vaddr) \
  (__builtin_constant_p(nr) ? \
   __constant_change_bit(nr, vaddr) : \
   __generic_change_bit(nr, vaddr))

static inline void __constant_change_bit(int nr, unsigned long *vaddr)
{
	char *p = (char *)vaddr + (nr ^ 31) / 8;
	__asm__ __volatile__ ("bchg %1,%0"
			: "+m" (*p) : "di" (nr & 7));
}

static inline void __generic_change_bit(int nr, unsigned long *vaddr)
{
	__asm__ __volatile__ ("bfchg %1{%0:#1}"
			: : "d" (nr^31), "o" (*vaddr) : "memory");
}

static inline int test_bit(int nr, const unsigned long *vaddr)
{
	return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
}

static inline int find_first_zero_bit(const unsigned long *vaddr,
				      unsigned size)
{
	const unsigned long *p = vaddr;
	int res = 32;
	unsigned long num;

	if (!size)
		return 0;

	size = (size + 31) >> 5;
	while (!(num = ~*p++)) {
		if (!--size)
			goto out;
	}

	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
			      : "=d" (res) : "d" (num & -num));
	res ^= 31;
out:
	return ((long)p - (long)vaddr - 4) * 8 + res;
}

static inline int find_next_zero_bit(const unsigned long *vaddr, int size,
				     int offset)
{
	const unsigned long *p = vaddr + (offset >> 5);
	int bit = offset & 31UL, res;

	if (offset >= size)
		return size;

	if (bit) {
		unsigned long num = ~*p++ & (~0UL << bit);
		offset -= bit;

		/* Look for zero in first longword */
		__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
				      : "=d" (res) : "d" (num & -num));
		if (res < 32)
			return offset + (res ^ 31);
		offset += 32;
	}
	/* No zero yet, search remaining full bytes for a zero */
	res = find_first_zero_bit(p, size - ((long)p - (long)vaddr) * 8);
	return offset + res;
}

static inline int find_first_bit(const unsigned long *vaddr, unsigned size)
{
	const unsigned long *p = vaddr;
	int res = 32;
	unsigned long num;

	if (!size)
		return 0;

	size = (size + 31) >> 5;
	while (!(num = *p++)) {
		if (!--size)
			goto out;
	}

	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
			      : "=d" (res) : "d" (num & -num));
	res ^= 31;
out:
	return ((long)p - (long)vaddr - 4) * 8 + res;
}

static inline int find_next_bit(const unsigned long *vaddr, int size,
				int offset)
{
	const unsigned long *p = vaddr + (offset >> 5);
	int bit = offset & 31UL, res;

	if (offset >= size)
		return size;

	if (bit) {
		unsigned long num = *p++ & (~0UL << bit);
		offset -= bit;

		/* Look for one in first longword */
		__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
				      : "=d" (res) : "d" (num & -num));
		if (res < 32)
			return offset + (res ^ 31);
		offset += 32;
	}
	/* No one yet, search remaining full bytes for a one */
	res = find_first_bit(p, size - ((long)p - (long)vaddr) * 8);
	return offset + res;
}

/*
 * ffz = Find First Zero in word. Undefined if no zero exists,
 * so code should check against ~0UL first..
 */
static inline unsigned long ffz(unsigned long word)
{
	int res;

	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
			      : "=d" (res) : "d" (~word & -~word));
	return res ^ 31;
}

#ifdef __KERNEL__

/*
 * ffs: find first bit set. This is defined the same way as
 * the libc and compiler builtin ffs routines, therefore
 * differs in spirit from the above ffz (man ffs).
 */

static inline int ffs(int x)
{
	int cnt;

	asm ("bfffo %1{#0:#0},%0" : "=d" (cnt) : "dm" (x & -x));

	return 32 - cnt;
}
#define __ffs(x) (ffs(x) - 1)

/*
 * fls: find last bit set.
 */

static inline int fls(int x)
{
	int cnt;

	asm ("bfffo %1{#0,#0},%0" : "=d" (cnt) : "dm" (x));

	return 32 - cnt;
}

#include <asm-generic/bitops/fls64.h>
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/hweight.h>

/* Bitmap functions for the minix filesystem */

static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
{
	const unsigned short *p = vaddr, *addr = vaddr;
	int res;
	unsigned short num;

	if (!size)
		return 0;

	size = (size >> 4) + ((size & 15) > 0);
	while (*p++ == 0xffff)
	{
		if (--size == 0)
			return (p - addr) << 4;
	}

	num = ~*--p;
	__asm__ __volatile__ ("bfffo %1{#16,#16},%0"
			      : "=d" (res) : "d" (num & -num));
	return ((p - addr) << 4) + (res ^ 31);
}

#define minix_test_and_set_bit(nr, addr)	__test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
#define minix_set_bit(nr,addr)			__set_bit((nr) ^ 16, (unsigned long *)(addr))
#define minix_test_and_clear_bit(nr, addr)	__test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))

static inline int minix_test_bit(int nr, const void *vaddr)
{
	const unsigned short *p = vaddr;
	return (p[nr >> 4] & (1U << (nr & 15))) != 0;
}

/* Bitmap functions for the ext2 filesystem. */

#include <asm-generic/bitops/ext2-non-atomic.h>

#define ext2_set_bit_atomic(lock, nr, addr)	test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
#define ext2_clear_bit_atomic(lock, nr, addr)	test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))

#endif /* __KERNEL__ */

#endif /* _M68K_BITOPS_H */