2 * Copyright © 2016 Intel Corporation
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:
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
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
25 #ifndef __I915_UTILS_H
26 #define __I915_UTILS_H
28 #define range_overflows(start, size, max) ({ \
29 typeof(start) start__ = (start); \
30 typeof(size) size__ = (size); \
31 typeof(max) max__ = (max); \
32 (void)(&start__ == &size__); \
33 (void)(&start__ == &max__); \
34 start__ > max__ || size__ > max__ - start__; \
37 #define range_overflows_t(type, start, size, max) \
38 range_overflows((type)(start), (type)(size), (type)(max))
40 /* Note we don't consider signbits :| */
41 #define overflows_type(x, T) \
42 (sizeof(x) > sizeof(T) && (x) >> (sizeof(T) * BITS_PER_BYTE))
44 #define ptr_mask_bits(ptr) ({ \
45 unsigned long __v = (unsigned long)(ptr); \
46 (typeof(ptr))(__v & PAGE_MASK); \
49 #define ptr_unpack_bits(ptr, bits) ({ \
50 unsigned long __v = (unsigned long)(ptr); \
51 (bits) = __v & ~PAGE_MASK; \
52 (typeof(ptr))(__v & PAGE_MASK); \
55 #define ptr_pack_bits(ptr, bits) \
56 ((typeof(ptr))((unsigned long)(ptr) | (bits)))
58 #define fetch_and_zero(ptr) ({ \
59 typeof(*ptr) __T = *(ptr); \
60 *(ptr) = (typeof(*ptr))0; \
64 #endif /* !__I915_UTILS_H */