Chris Wilson | 40b326e | 2017-01-05 15:30:22 +0000 | [diff] [blame] | 1 | /* |
| 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 Wilson | 1692cd6 | 2017-01-30 13:47:21 +0000 | [diff] [blame] | 28 | #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 Wilson | 40b326e | 2017-01-05 15:30:22 +0000 | [diff] [blame] | 39 | #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 Wilson | b716393 | 2017-01-05 16:41:48 +0000 | [diff] [blame] | 55 | #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 Wilson | 40b326e | 2017-01-05 15:30:22 +0000 | [diff] [blame] | 75 | #endif /* !__I915_UTILS_H */ |