102 lines
3.3 KiB
C
102 lines
3.3 KiB
C
/* $NetBSD: drm_atomic.h,v 1.7 2008/06/03 20:35:01 dyoung Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran, Blair Sadewitz, et. al.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* XXX This code is essentially a frob of the atomic operations provided by
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* the Linux kernel at the time the DRM was ported.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: drm_atomic.h,v 1.7 2008/06/03 20:35:01 dyoung Exp $");
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#include <sys/atomic.h>
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typedef uint32_t atomic_t;
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#define atomic_set(p, v) (*((volatile uint32_t *)p) = (v))
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#define atomic_read(p) (*((volatile uint32_t *)p))
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#define atomic_inc(p) atomic_inc_uint(p)
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#define atomic_dec(p) atomic_dec_uint(p)
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#define atomic_add(v, p) atomic_add_int(p, v)
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#define atomic_sub(v, p) atomic_add_int(p, -(v))
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#define atomic_set_int(p, bits) atomic_or_uint(p, bits)
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#define atomic_clear_int(p, bits) atomic_and_uint(p, ~(bits))
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#define atomic_cmpset_int(p, o, n) \
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((old == atomic_cas_uint(p, o, n)) ? 1 : 0)
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#define set_bit(b, p) \
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atomic_set_int(((volatile uint32_t *)(volatile void *)p) + (b >> 5),\
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(1 << (b & 0x1f)))
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#define clear_bit(b, p) \
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atomic_clear_int(((volatile uint32_t *)(volatile void *)p) + (b >> 5), \
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(1 << (b & 0x1f)))
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#define test_bit(b, p) \
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(((volatile uint32_t *)(volatile void *)p)[b >> 5] & (1 << (b & 0x1f)))
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static inline uint32_t
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test_and_set_bit(int b, volatile void *p)
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{
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volatile uint32_t *val;
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uint32_t mask, old;
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val = (volatile uint32_t *)p;
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mask = 1 << b;
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do {
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old = *val;
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if ((old & mask) != 0)
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break;
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} while (atomic_cas_uint(val, old, old | mask) != old);
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return old & mask;
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}
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static inline int
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find_first_zero_bit(volatile void *p, int maxbit)
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{
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int b;
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volatile int *ptr = (volatile int *)p;
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for (b = 0; b < maxbit; b += 32) {
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if (ptr[b >> 5] != ~0) {
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for (;;) {
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if ((ptr[b >> 5] & (1 << (b & 0x1f))) == 0)
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return b;
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b++;
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}
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}
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}
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return maxbit;
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}
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