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Chris Wilson40b326e2017-01-05 15:30:22 +00001/*
2 * Copyright © 2016 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 */
24
25#ifndef __I915_UTILS_H
26#define __I915_UTILS_H
27
Chris Wilson1692cd62017-01-30 13:47:21 +000028#if GCC_VERSION >= 70000
29#define add_overflows(A, B) \
30 __builtin_add_overflow_p((A), (B), (typeof((A) + (B)))0)
31#else
32#define add_overflows(A, B) ({ \
33 typeof(A) a = (A); \
34 typeof(B) b = (B); \
35 a + b < a; \
36})
37#endif
38
Chris Wilson40b326e2017-01-05 15:30:22 +000039#define range_overflows(start, size, max) ({ \
40 typeof(start) start__ = (start); \
41 typeof(size) size__ = (size); \
42 typeof(max) max__ = (max); \
43 (void)(&start__ == &size__); \
44 (void)(&start__ == &max__); \
45 start__ > max__ || size__ > max__ - start__; \
46})
47
48#define range_overflows_t(type, start, size, max) \
49 range_overflows((type)(start), (type)(size), (type)(max))
50
51/* Note we don't consider signbits :| */
52#define overflows_type(x, T) \
53 (sizeof(x) > sizeof(T) && (x) >> (sizeof(T) * BITS_PER_BYTE))
54
Chris Wilsonb7163932017-01-05 16:41:48 +000055#define ptr_mask_bits(ptr) ({ \
56 unsigned long __v = (unsigned long)(ptr); \
57 (typeof(ptr))(__v & PAGE_MASK); \
58})
59
60#define ptr_unpack_bits(ptr, bits) ({ \
61 unsigned long __v = (unsigned long)(ptr); \
62 (bits) = __v & ~PAGE_MASK; \
63 (typeof(ptr))(__v & PAGE_MASK); \
64})
65
66#define ptr_pack_bits(ptr, bits) \
67 ((typeof(ptr))((unsigned long)(ptr) | (bits)))
68
69#define fetch_and_zero(ptr) ({ \
70 typeof(*ptr) __T = *(ptr); \
71 *(ptr) = (typeof(*ptr))0; \
72 __T; \
73})
74
Chris Wilson40b326e2017-01-05 15:30:22 +000075#endif /* !__I915_UTILS_H */