592ffb2175
Revert r338177, r338176, r338175, r338174, r338172 After long consultations with re@, core members and mmacy, revert these changes. Followup changes will be made to mark them as deprecated and prent a message about where to find the up-to-date driver. Followup commits will be made to make this clear in the installer. Followup commits to reduce POLA in ways we're still exploring. It's anticipated that after the freeze, this will be removed in 13-current (with the residual of the drm2 code copied to sys/arm/dev/drm2 for the TEGRA port's use w/o the intel or radeon drivers). Due to the impending freeze, there was no formal core vote for this. I've been talking to different core members all day, as well as Matt Macey and Glen Barber. Nobody is completely happy, all are grudgingly going along with this. Work is in progress to mitigate the negative effects as much as possible. Requested by: re@ (gjb, rgrimes)
97 lines
3.5 KiB
C
97 lines
3.5 KiB
C
/**
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* \file drm_atomic.h
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* Atomic operations used in the DRM which may or may not be provided by the OS.
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*
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* \author Eric Anholt <anholt@FreeBSD.org>
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*/
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/*-
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* Copyright 2004 Eric Anholt
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* Copyright 2013 Jung-uk Kim <jkim@FreeBSD.org>
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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typedef u_int atomic_t;
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typedef uint64_t atomic64_t;
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#define NB_BITS_PER_LONG (sizeof(long) * NBBY)
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#define BITS_TO_LONGS(x) howmany(x, NB_BITS_PER_LONG)
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#define atomic_read(p) atomic_load_acq_int(p)
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#define atomic_set(p, v) atomic_store_rel_int(p, v)
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#define atomic64_read(p) atomic_load_acq_64(p)
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#define atomic64_set(p, v) atomic_store_rel_64(p, v)
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#define atomic_add(v, p) atomic_add_int(p, v)
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#define atomic_sub(v, p) atomic_subtract_int(p, v)
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#define atomic_inc(p) atomic_add(1, p)
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#define atomic_dec(p) atomic_sub(1, p)
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#define atomic_add_return(v, p) (atomic_fetchadd_int(p, v) + (v))
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#define atomic_sub_return(v, p) (atomic_fetchadd_int(p, -(v)) - (v))
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#define atomic_inc_return(p) atomic_add_return(1, p)
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#define atomic_dec_return(p) atomic_sub_return(1, p)
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#define atomic_add_and_test(v, p) (atomic_add_return(v, p) == 0)
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#define atomic_sub_and_test(v, p) (atomic_sub_return(v, p) == 0)
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#define atomic_inc_and_test(p) (atomic_inc_return(p) == 0)
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#define atomic_dec_and_test(p) (atomic_dec_return(p) == 0)
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#define atomic_xchg(p, v) atomic_swap_int(p, v)
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#define atomic64_xchg(p, v) atomic_swap_64(p, v)
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#define __bit_word(b) ((b) / NB_BITS_PER_LONG)
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#define __bit_mask(b) (1UL << (b) % NB_BITS_PER_LONG)
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#define __bit_addr(p, b) ((volatile u_long *)(p) + __bit_word(b))
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#define clear_bit(b, p) \
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atomic_clear_long(__bit_addr(p, b), __bit_mask(b))
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#define set_bit(b, p) \
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atomic_set_long(__bit_addr(p, b), __bit_mask(b))
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#define test_bit(b, p) \
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((*__bit_addr(p, b) & __bit_mask(b)) != 0)
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#define test_and_set_bit(b, p) \
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(atomic_xchg((p), 1) != b)
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#define cmpxchg(ptr, old, new) \
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(atomic_cmpset_int((volatile u_int *)(ptr),(old),(new)) ? (old) : (0))
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#define atomic_inc_not_zero(p) atomic_inc(p)
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#define atomic_clear_mask(b, p) atomic_clear_int((p), (b))
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static __inline u_long
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find_first_zero_bit(const u_long *p, u_long max)
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{
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u_long i, n;
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KASSERT(max % NB_BITS_PER_LONG == 0, ("invalid bitmap size %lu", max));
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for (i = 0; i < max / NB_BITS_PER_LONG; i++) {
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n = ~p[i];
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if (n != 0)
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return (i * NB_BITS_PER_LONG + ffsl(n) - 1);
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}
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return (max);
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}
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