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