/* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * \file drm_atomic.h * Atomic operations used in the DRM which may or may not be provided by the OS. * * \author Eric Anholt */ /* * Copyright 2004 Eric Anholt * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ /* Many of these implementations are rather fake, but good enough. */ #ifndef _SYS_DRM_ATOMIC_H_ #define _SYS_DRM_ATOMIC_H_ #ifdef __cplusplus extern "C" { #endif #include #ifdef __LINT__ #undef inline #define inline #endif typedef uint32_t atomic_t; #define atomic_set(p, v) (*(p) = (v)) #define atomic_read(p) (*(p)) #define atomic_inc(p) atomic_add_int(p, 1) #define atomic_dec(p) atomic_dec_uint(p) #define atomic_add(n, p) atomic_add_int(p, n) #define atomic_sub(n, p) atomic_dec_uint(p, n) #define atomic_set_int(p, bits) atomic_or_uint(p, bits) #define atomic_clear_int(p, bits) atomic_and_uint(p, ~(bits)) #define atomic_cmpset_int(p, c, n) \ ((c == atomic_cas_uint(p, c, n)) ? 1 : 0) #define set_bit(b, p) \ atomic_set_int(((volatile uint_t *)(void *)p) + (b >> 5), \ 1 << (b & 0x1f)) #define clear_bit(b, p) \ atomic_clear_int(((volatile uint_t *)(void *)p) + (b >> 5), \ 1 << (b & 0x1f)) #define test_bit(b, p) \ (((volatile uint_t *)(void *)p)[b >> 5] & (1 << (b & 0x1f))) /* * Note: this routine doesn't return old value. It return * 0 when succeeds, or -1 when fails. */ #ifdef _LP64 #define test_and_set_bit(b, p) \ atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 6), (b & 0x3f)) #else #define test_and_set_bit(b, p) \ atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 5), (b & 0x1f)) #endif #ifdef __cplusplus } #endif #endif /* _SYS_DRM_ATOMIC_H_ */