drm_atomic.h

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    1 /**
    2  * \file drm_atomic.h
    3  * Atomic operations used in the DRM which may or may not be provided by the OS.
    4  * 
    5  * \author Eric Anholt <anholt@FreeBSD.org>
    6  */
    7 
    8 /*-
    9  * Copyright 2004 Eric Anholt
   10  * Copyright 2013 Jung-uk Kim <jkim@FreeBSD.org>
   11  * All Rights Reserved.
   12  *
   13  * Permission is hereby granted, free of charge, to any person obtaining a
   14  * copy of this software and associated documentation files (the "Software"),
   15  * to deal in the Software without restriction, including without limitation
   16  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   17  * and/or sell copies of the Software, and to permit persons to whom the
   18  * Software is furnished to do so, subject to the following conditions:
   19  *
   20  * The above copyright notice and this permission notice (including the next
   21  * paragraph) shall be included in all copies or substantial portions of the
   22  * Software.
   23  *
   24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   27  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
   28  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   29  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   30  * OTHER DEALINGS IN THE SOFTWARE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 typedef u_int           atomic_t;
   37 typedef uint64_t        atomic64_t;
   38 
   39 #define NB_BITS_PER_LONG                (sizeof(long) * NBBY)
   40 #define BITS_TO_LONGS(x)                howmany(x, NB_BITS_PER_LONG)
   41 
   42 #define atomic_read(p)                  atomic_load_acq_int(p)
   43 #define atomic_set(p, v)                atomic_store_rel_int(p, v)
   44 
   45 #define atomic64_read(p)                atomic_load_acq_64(p)
   46 #define atomic64_set(p, v)              atomic_store_rel_64(p, v)
   47 
   48 #define atomic_add(v, p)                atomic_add_int(p, v)
   49 #define atomic_sub(v, p)                atomic_subtract_int(p, v)
   50 #define atomic_inc(p)                   atomic_add(1, p)
   51 #define atomic_dec(p)                   atomic_sub(1, p)
   52 
   53 #define atomic_add_return(v, p)         (atomic_fetchadd_int(p, v) + (v))
   54 #define atomic_sub_return(v, p)         (atomic_fetchadd_int(p, -(v)) - (v))
   55 #define atomic_inc_return(p)            atomic_add_return(1, p)
   56 #define atomic_dec_return(p)            atomic_sub_return(1, p)
   57 
   58 #define atomic_add_and_test(v, p)       (atomic_add_return(v, p) == 0)
   59 #define atomic_sub_and_test(v, p)       (atomic_sub_return(v, p) == 0)
   60 #define atomic_inc_and_test(p)          (atomic_inc_return(p) == 0)
   61 #define atomic_dec_and_test(p)          (atomic_dec_return(p) == 0)
   62 
   63 #define atomic_xchg(p, v)               atomic_swap_int(p, v)
   64 #define atomic64_xchg(p, v)             atomic_swap_64(p, v)
   65 
   66 #define __bit_word(b)                   ((b) / NB_BITS_PER_LONG)
   67 #define __bit_mask(b)                   (1UL << (b) % NB_BITS_PER_LONG)
   68 #define __bit_addr(p, b)                ((volatile u_long *)(p) + __bit_word(b))
   69 
   70 #define clear_bit(b, p) \
   71     atomic_clear_long(__bit_addr(p, b), __bit_mask(b))
   72 #define set_bit(b, p) \
   73     atomic_set_long(__bit_addr(p, b), __bit_mask(b))
   74 #define test_bit(b, p) \
   75     ((*__bit_addr(p, b) & __bit_mask(b)) != 0)
   76 #define test_and_set_bit(b, p) \
   77     (atomic_xchg((p), 1) != b)
   78 #define cmpxchg(ptr, old, new) \
   79     (atomic_cmpset_int((volatile u_int *)(ptr),(old),(new)) ? (old) : (0))
   80 
   81 #define atomic_inc_not_zero(p)          atomic_inc(p)
   82 #define atomic_clear_mask(b, p)         atomic_clear_int((p), (b))
   83 
   84 static __inline u_long
   85 find_first_zero_bit(const u_long *p, u_long max)
   86 {
   87         u_long i, n;
   88 
   89         KASSERT(max % NB_BITS_PER_LONG == 0, ("invalid bitmap size %lu", max));
   90         for (i = 0; i < max / NB_BITS_PER_LONG; i++) {
   91                 n = ~p[i];
   92                 if (n != 0)
   93                         return (i * NB_BITS_PER_LONG + ffsl(n) - 1);
   94         }
   95         return (max);
   96 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/drm2/drm_atomic.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/drm_atomic.h