Add file missed in last commit: Commit first pieces of port to OpenBSD,
done by Martin Lexa (martin at martinlexa dot cz). Now that we've got
porting for all three major BSDs (and the fourth being very similar to
FreeBSD), move the mostly-duplication drm_os_* files into drmP.h.
Remove some cruft from linux heritage and from pieces of the DRM that
have since been removed.
Note that things are still not quite working for even FreeBSD, but these
are first steps at cleanup, and just a WIP checkpoint.
main
Eric Anholt
parent
d7510ea413
commit
7adee84064
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/**
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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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* 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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/* Many of these implementations are rather fake, but good enough. */
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typedef u_int32_t atomic_t;
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#ifdef __FreeBSD__
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#define atomic_set(p, v) (*(p) = (v))
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#define atomic_read(p) (*(p))
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#define atomic_inc(p) atomic_add_int(p, 1)
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#define atomic_dec(p) atomic_subtract_int(p, 1)
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#define atomic_add(n, p) atomic_add_int(p, n)
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#define atomic_sub(n, p) atomic_subtract_int(p, n)
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#else /* __FreeBSD__ */
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/* FIXME */
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#define atomic_set(p, v) (*(p) = (v))
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#define atomic_read(p) (*(p))
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#define atomic_inc(p) (*(p) += 1)
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#define atomic_dec(p) (*(p) -= 1)
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#define atomic_add(n, p) (*(p) += (n))
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#define atomic_sub(n, p) (*(p) -= (n))
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/* FIXME */
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#define atomic_add_int(p, v) *(p) += v
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#define atomic_subtract_int(p, v) *(p) -= v
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#define atomic_set_int(p, bits) *(p) |= (bits)
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#define atomic_clear_int(p, bits) *(p) &= ~(bits)
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#endif /* !__FreeBSD__ */
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#if !defined(__FreeBSD_version) || (__FreeBSD_version < 500000)
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#if defined(__i386__)
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/* The extra atomic functions from 5.0 haven't been merged to 4.x */
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static __inline int
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atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
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{
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int res = exp;
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__asm __volatile (
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" lock ; "
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" cmpxchgl %1,%2 ; "
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" setz %%al ; "
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" movzbl %%al,%0 ; "
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"1: "
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"# atomic_cmpset_int"
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: "+a" (res) /* 0 (result) */
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: "r" (src), /* 1 */
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"m" (*(dst)) /* 2 */
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: "memory");
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return (res);
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}
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#else /* __i386__ */
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static __inline int
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atomic_cmpset_int(__volatile__ int *dst, int old, int new)
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{
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int s = splhigh();
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if (*dst==old) {
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*dst = new;
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splx(s);
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return 1;
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}
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splx(s);
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return 0;
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}
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#endif /* !__i386__ */
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#endif /* !__FreeBSD_version || __FreeBSD_version < 500000 */
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static __inline atomic_t
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test_and_set_bit(int b, volatile void *p)
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{
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int s = splhigh();
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unsigned int m = 1<<b;
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unsigned int r = *(volatile int *)p & m;
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*(volatile int *)p |= m;
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splx(s);
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return r;
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}
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static __inline void
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clear_bit(int b, volatile void *p)
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{
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atomic_clear_int(((volatile int *)p) + (b >> 5), 1 << (b & 0x1f));
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}
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static __inline void
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set_bit(int b, volatile void *p)
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{
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atomic_set_int(((volatile int *)p) + (b >> 5), 1 << (b & 0x1f));
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}
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static __inline int
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test_bit(int b, volatile void *p)
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{
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return ((volatile int *)p)[b >> 5] & (1 << (b & 0x1f));
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}
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static __inline int
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find_first_zero_bit(volatile void *p, int max)
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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 < max; 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 max;
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}
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