mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-21 18:27:22 +00:00
95 lines
3.5 KiB
C
95 lines
3.5 KiB
C
/**
|
|
* \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 2013 Jung-uk Kim <jkim@FreeBSD.org>
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
typedef u_int atomic_t;
|
|
typedef uint64_t atomic64_t;
|
|
|
|
#define NB_BITS_PER_LONG (sizeof(long) * NBBY)
|
|
#define BITS_TO_LONGS(x) howmany(x, NB_BITS_PER_LONG)
|
|
|
|
#define atomic_read(p) atomic_load_acq_int(p)
|
|
#define atomic_set(p, v) atomic_store_rel_int(p, v)
|
|
|
|
#define atomic64_read(p) atomic_load_acq_64(p)
|
|
#define atomic64_set(p, v) atomic_store_rel_64(p, v)
|
|
|
|
#define atomic_add(v, p) atomic_add_int(p, v)
|
|
#define atomic_sub(v, p) atomic_subtract_int(p, v)
|
|
#define atomic_inc(p) atomic_add(1, p)
|
|
#define atomic_dec(p) atomic_sub(1, p)
|
|
|
|
#define atomic_add_return(v, p) (atomic_fetchadd_int(p, v) + (v))
|
|
#define atomic_sub_return(v, p) (atomic_fetchadd_int(p, -(v)) - (v))
|
|
#define atomic_inc_return(p) atomic_add_return(1, p)
|
|
#define atomic_dec_return(p) atomic_sub_return(1, p)
|
|
|
|
#define atomic_add_and_test(v, p) (atomic_add_return(v, p) == 0)
|
|
#define atomic_sub_and_test(v, p) (atomic_sub_return(v, p) == 0)
|
|
#define atomic_inc_and_test(p) (atomic_inc_return(p) == 0)
|
|
#define atomic_dec_and_test(p) (atomic_dec_return(p) == 0)
|
|
|
|
#define atomic_xchg(p, v) atomic_swap_int(p, v)
|
|
#define atomic64_xchg(p, v) atomic_swap_64(p, v)
|
|
|
|
#define __bit_word(b) ((b) / NB_BITS_PER_LONG)
|
|
#define __bit_mask(b) (1UL << (b) % NB_BITS_PER_LONG)
|
|
#define __bit_addr(p, b) ((volatile u_long *)(p) + __bit_word(b))
|
|
|
|
#define clear_bit(b, p) \
|
|
atomic_clear_long(__bit_addr(p, b), __bit_mask(b))
|
|
#define set_bit(b, p) \
|
|
atomic_set_long(__bit_addr(p, b), __bit_mask(b))
|
|
#define test_bit(b, p) \
|
|
((*__bit_addr(p, b) & __bit_mask(b)) != 0)
|
|
#define test_and_set_bit(b, p) \
|
|
(atomic_xchg((p), 1) != b)
|
|
#define cmpxchg(ptr, old, new) \
|
|
(atomic_cmpset_int((volatile u_int *)(ptr),(old),(new)) ? (old) : (0))
|
|
|
|
#define atomic_inc_not_zero(p) atomic_inc(p)
|
|
#define atomic_clear_mask(b, p) atomic_clear_int((p), (b))
|
|
|
|
static __inline u_long
|
|
find_first_zero_bit(const u_long *p, u_long max)
|
|
{
|
|
u_long i, n;
|
|
|
|
KASSERT(max % NB_BITS_PER_LONG == 0, ("invalid bitmap size %lu", max));
|
|
for (i = 0; i < max / NB_BITS_PER_LONG; i++) {
|
|
n = ~p[i];
|
|
if (n != 0)
|
|
return (i * NB_BITS_PER_LONG + ffsl(n) - 1);
|
|
}
|
|
return (max);
|
|
}
|