0a6a1f1d05
This brings our tree to NetBSD 7.0, as found on -current on the 10-10-2015. This updates: - LLVM to 3.6.1 - GCC to GCC 5.1 - Replace minix/commands/zdump with usr.bin/zdump - external/bsd/libelf has moved to /external/bsd/elftoolchain/ - Import ctwm - Drop sprintf from libminc Change-Id: I149836ac18e9326be9353958bab9b266efb056f0
92 lines
3.3 KiB
C
92 lines
3.3 KiB
C
/* $NetBSD: atomic_cas_by_cas32.c,v 1.4 2014/09/03 19:30:47 matt Exp $ */
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/*-
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* Copyright (c) 2014 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 Jason R. Thorpe.
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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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#include <sys/types.h>
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#include <sys/inttypes.h>
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#include "atomic_op_namespace.h"
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uint32_t _atomic_cas_32(volatile uint32_t *addr, uint32_t old, uint32_t new);
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uint16_t _atomic_cas_16(volatile uint16_t *addr, uint16_t old, uint16_t new);
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uint8_t _atomic_cas_8(volatile uint8_t *addr, uint8_t old, uint8_t new);
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/*
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* This file provides emulation of 8 bit and 16 bit CAS operations based on
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* 32 bit CAS.
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*/
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uint16_t
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_atomic_cas_16(volatile uint16_t *addr, uint16_t old, uint16_t new)
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{
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const uintptr_t base = (uintptr_t)addr & ~3;
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const size_t off = (uintptr_t)addr - base;
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volatile uint32_t * ptr = (volatile uint32_t *)base;
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const size_t shift = off*8;
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const uint32_t mask = 0x0ffff << shift;
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const uint32_t old32_part = (uint32_t)old << shift;
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const uint32_t new32_part = (uint32_t)new << shift;
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uint32_t old32, new32;
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do {
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old32 = *ptr;
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if ((old32 & mask) != old32_part)
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return (uint16_t)((old32 & mask) >> shift);
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new32 = (old32 & ~mask) | new32_part;
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} while (_atomic_cas_32(ptr, old32, new32) != old32);
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return old;
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}
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crt_alias(__sync_val_compare_and_swap_2,_atomic_cas_16)
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uint8_t
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_atomic_cas_8(volatile uint8_t *addr, uint8_t old, uint8_t new)
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{
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const uintptr_t base = (uintptr_t)addr & ~3;
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const size_t off = (uintptr_t)addr - base;
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volatile uint32_t * ptr = (volatile uint32_t *)base;
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const size_t shift = off*8;
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const uint32_t mask = 0x0ff << shift;
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const uint32_t old32_part = (uint32_t)old << shift;
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const uint32_t new32_part = (uint32_t)new << shift;
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uint32_t old32, new32;
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do {
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old32 = *ptr;
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if ((old32 & mask) != old32_part)
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return (uint8_t)((old32 & mask) >> shift);
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new32 = (old32 & ~mask) | new32_part;
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} while (_atomic_cas_32(ptr, old32, new32) != old32);
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return old;
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}
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crt_alias(__sync_val_compare_and_swap_1,_atomic_cas_8)
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