aboutsummaryrefslogtreecommitdiff
path: root/sys/compat/linuxkpi/common/include/linux/bitmap.h
blob: 897682f8f6b5cf0667a3db794d8239908b8c2553 (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
/*
 * Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#ifndef _LINUX_BITMAP_H_
#define	_LINUX_BITMAP_H_

#include <linux/bitops.h>

static inline void
bitmap_zero(unsigned long *addr, const unsigned int size)
{
	memset(addr, 0, BITS_TO_LONGS(size) * sizeof(long));
}

static inline void
bitmap_fill(unsigned long *addr, const unsigned int size)
{
	const unsigned int tail = size & (BITS_PER_LONG - 1);

	memset(addr, 0xff, BIT_WORD(size) * sizeof(long));

	if (tail)
		addr[BIT_WORD(size)] = BITMAP_LAST_WORD_MASK(tail);
}

static inline int
bitmap_full(unsigned long *addr, const unsigned int size)
{
	const unsigned int end = BIT_WORD(size);
	const unsigned int tail = size & (BITS_PER_LONG - 1);
	unsigned int i;

	for (i = 0; i != end; i++) {
		if (addr[i] != ~0UL)
			return (0);
	}

	if (tail) {
		const unsigned long mask = BITMAP_LAST_WORD_MASK(tail);

		if ((addr[end] & mask) != mask)
			return (0);
	}
	return (1);
}

static inline int
bitmap_empty(unsigned long *addr, const unsigned int size)
{
	const unsigned int end = BIT_WORD(size);
	const unsigned int tail = size & (BITS_PER_LONG - 1);
	unsigned int i;

	for (i = 0; i != end; i++) {
		if (addr[i] != 0)
			return (0);
	}

	if (tail) {
		const unsigned long mask = BITMAP_LAST_WORD_MASK(tail);

		if ((addr[end] & mask) != 0)
			return (0);
	}
	return (1);
}

static inline void
bitmap_set(unsigned long *map, unsigned int start, int nr)
{
	const unsigned int size = start + nr;
	int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG);
	unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start);

	map += BIT_WORD(start);

	while (nr - bits_to_set >= 0) {
		*map |= mask_to_set;
		nr -= bits_to_set;
		bits_to_set = BITS_PER_LONG;
		mask_to_set = ~0UL;
		map++;
	}

	if (nr) {
		mask_to_set &= BITMAP_LAST_WORD_MASK(size);
		*map |= mask_to_set;
	}
}

static inline void
bitmap_clear(unsigned long *map, unsigned int start, int nr)
{
	const unsigned int size = start + nr;
	int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
	unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);

	map += BIT_WORD(start);

	while (nr - bits_to_clear >= 0) {
		*map &= ~mask_to_clear;
		nr -= bits_to_clear;
		bits_to_clear = BITS_PER_LONG;
		mask_to_clear = ~0UL;
		map++;
	}

	if (nr) {
		mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
		*map &= ~mask_to_clear;
	}
}

static inline unsigned int
bitmap_find_next_zero_area_off(const unsigned long *map,
    const unsigned int size, unsigned int start,
    unsigned int nr, unsigned int align_mask,
    unsigned int align_offset)
{
	unsigned int index;
	unsigned int end;
	unsigned int i;

retry:
	index = find_next_zero_bit(map, size, start);

	index = (((index + align_offset) + align_mask) & ~align_mask) - align_offset;

	end = index + nr;
	if (end > size)
		return (end);

	i = find_next_bit(map, end, index);
	if (i < end) {
		start = i + 1;
		goto retry;
	}
	return (index);
}

static inline unsigned int
bitmap_find_next_zero_area(const unsigned long *map,
    const unsigned int size, unsigned int start,
    unsigned int nr, unsigned int align_mask)
{
	return (bitmap_find_next_zero_area_off(map, size,
	    start, nr, align_mask, 0));
}

static inline int
bitmap_find_free_region(unsigned long *bitmap, int bits, int order)
{
	int pos;
	int end;

	for (pos = 0; (end = pos + (1 << order)) <= bits; pos = end) {
		if (!linux_reg_op(bitmap, pos, order, REG_OP_ISFREE))
			continue;
		linux_reg_op(bitmap, pos, order, REG_OP_ALLOC);
		return (pos);
	}
	return (-ENOMEM);
}

static inline int
bitmap_allocate_region(unsigned long *bitmap, int pos, int order)
{
	if (!linux_reg_op(bitmap, pos, order, REG_OP_ISFREE))
		return (-EBUSY);
	linux_reg_op(bitmap, pos, order, REG_OP_ALLOC);
	return (0);
}

static inline void
bitmap_release_region(unsigned long *bitmap, int pos, int order)
{
	linux_reg_op(bitmap, pos, order, REG_OP_RELEASE);
}

static inline unsigned int
bitmap_weight(unsigned long *addr, const unsigned int size)
{
	const unsigned int end = BIT_WORD(size);
	const unsigned int tail = size & (BITS_PER_LONG - 1);
	unsigned int retval = 0;
	unsigned int i;

	for (i = 0; i != end; i++)
		retval += hweight_long(addr[i]);

	if (tail) {
		const unsigned long mask = BITMAP_LAST_WORD_MASK(tail);

		retval += hweight_long(addr[end] & mask);
	}
	return (retval);
}

static inline int
bitmap_equal(const unsigned long *pa,
    const unsigned long *pb, unsigned size)
{
	const unsigned int end = BIT_WORD(size);
	const unsigned int tail = size & (BITS_PER_LONG - 1);
	unsigned int i;

	for (i = 0; i != end; i++) {
		if (pa[i] != pb[i])
			return (0);
	}

	if (tail) {
		const unsigned long mask = BITMAP_LAST_WORD_MASK(tail);

		if ((pa[end] ^ pb[end]) & mask)
			return (0);
	}
	return (1);
}

static inline void
bitmap_or(unsigned long *dst, const unsigned long *src1,
    const unsigned long *src2, const unsigned int size)
{
	const unsigned int end = BITS_TO_LONGS(size);
	unsigned int i;

	for (i = 0; i != end; i++)
		dst[i] = src1[i] | src2[i];
}

static inline void
bitmap_and(unsigned long *dst, const unsigned long *src1,
    const unsigned long *src2, const unsigned int size)
{
	const unsigned int end = BITS_TO_LONGS(size);
	unsigned int i;

	for (i = 0; i != end; i++)
		dst[i] = src1[i] & src2[i];
}

static inline void
bitmap_xor(unsigned long *dst, const unsigned long *src1,
    const unsigned long *src2, const unsigned int size)
{
	const unsigned int end = BITS_TO_LONGS(size);
	unsigned int i;

	for (i = 0; i != end; i++)
		dst[i] = src1[i] ^ src2[i];
}

#endif					/* _LINUX_BITMAP_H_ */