1 /* 2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 /* 6 * \file drm_atomic.h 7 * Atomic operations used in the DRM which may or may not be provided by the OS. 8 * 9 * \author Eric Anholt <anholt@FreeBSD.org> 10 */ 11 12 /* 13 * Copyright 2004 Eric Anholt 14 * Copyright (c) 2009, Intel Corporation. 15 * All Rights Reserved. 16 * 17 * Permission is hereby granted, free of charge, to any person obtaining a 18 * copy of this software and associated documentation files (the "Software"), 19 * to deal in the Software without restriction, including without limitation 20 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 21 * and/or sell copies of the Software, and to permit persons to whom the 22 * Software is furnished to do so, subject to the following conditions: 23 * 24 * The above copyright notice and this permission notice (including the next 25 * paragraph) shall be included in all copies or substantial portions of the 26 * Software. 27 * 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 34 * OTHER DEALINGS IN THE SOFTWARE. 35 */ 36 37 /* Many of these implementations are rather fake, but good enough. */ 38 39 40 41 #ifndef _SYS_DRM_ATOMIC_H_ 42 #define _SYS_DRM_ATOMIC_H_ 43 44 #ifdef __cplusplus 45 extern "C" { 46 #endif 47 48 #include <sys/atomic.h> 49 50 #ifdef __LINT__ 51 #undef inline 52 #define inline 53 #endif 54 typedef uint32_t atomic_t; 55 56 #define atomic_set(p, v) (*(p) = (v)) 57 #define atomic_read(p) (*(p)) 58 #define atomic_inc(p) atomic_add_int(p, 1) 59 #define atomic_dec(p) atomic_dec_uint(p) 60 #define atomic_add(n, p) atomic_add_int(p, n) 61 #define atomic_sub(n, p) atomic_add_int(p, -n) 62 #define atomic_set_int(p, bits) atomic_or_uint(p, bits) 63 #define atomic_clear_int(p, bits) atomic_and_uint(p, ~(bits)) 64 #define atomic_cmpset_int(p, c, n) \ 65 ((c == atomic_cas_uint(p, c, n)) ? 1 : 0) 66 67 #define set_bit(b, p) \ 68 atomic_set_int(((volatile uint_t *)(void *)p) + (b >> 5), \ 69 1 << (b & 0x1f)) 70 71 #define clear_bit(b, p) \ 72 atomic_clear_int(((volatile uint_t *)(void *)p) + (b >> 5), \ 73 1 << (b & 0x1f)) 74 75 #define test_bit(b, p) \ 76 (((volatile uint_t *)(void *)p)[b >> 5] & (1 << (b & 0x1f))) 77 78 /* 79 * Note: this routine doesn't return old value. It return 80 * 0 when succeeds, or -1 when fails. 81 */ 82 #ifdef _LP64 83 #define test_and_set_bit(b, p) \ 84 atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 6), (b & 0x3f)) 85 #else 86 #define test_and_set_bit(b, p) \ 87 atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 5), (b & 0x1f)) 88 #endif 89 90 #ifdef __cplusplus 91 } 92 #endif 93 94 #endif /* _SYS_DRM_ATOMIC_H_ */ 95