| /* |
| * 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 <anholt@FreeBSD.org> |
| */ |
| |
| /* |
| * Copyright 2004 Eric Anholt |
| * Copyright (c) 2009, Intel Corporation. |
| * 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 <sys/atomic.h> |
| |
| #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_inc_uint(p) |
| #define atomic_dec(p) atomic_dec_uint(p) |
| #define atomic_add(n, p) atomic_add_int(p, n) |
| #define atomic_sub(n, p) atomic_add_int(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_ */ |