mirror of
https://github.com/projectacrn/acrn-hypervisor.git
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0a83cf462d
From now on, only plan to support atomic operation for int/long. Signed-off-by: Li, Fei1 <fei1.li@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>
269 lines
6.4 KiB
C
269 lines
6.4 KiB
C
/*-
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* Copyright (c) 1998 Doug Rabson
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* Copyright (c) 2018 Intel Corporation
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* All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef ATOMIC_H
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#define ATOMIC_H
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#define BUS_LOCK "lock ; "
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/*
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* #define atomic_set_int(P, V) (*(unsigned int *)(P) |= (V))
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*/
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static inline void atomic_set_int(unsigned int *p, unsigned int v)
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{
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__asm __volatile(BUS_LOCK "orl %1,%0"
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: "+m" (*p)
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: "r" (v)
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: "cc", "memory");
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}
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/*
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* #define atomic_clear_int(P, V) (*(unsigned int *)(P) &= ~(V))
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*/
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static inline void atomic_clear_int(unsigned int *p, unsigned int v)
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{
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__asm __volatile(BUS_LOCK "andl %1,%0"
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: "+m" (*p)
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: "r" (~v)
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: "cc", "memory");
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}
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/*
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* #define atomic_add_int(P, V) (*(unsigned int *)(P) += (V))
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*/
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static inline void atomic_add_int(unsigned int *p, unsigned int v)
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{
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__asm __volatile(BUS_LOCK "addl %1,%0"
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: "+m" (*p)
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: "r" (v)
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: "cc", "memory");
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}
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/*
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* #define atomic_subtract_int(P, V) (*(unsigned int *)(P) -= (V))
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*/
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static inline void atomic_subtract_int(unsigned int *p, unsigned int v)
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{
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__asm __volatile(BUS_LOCK "subl %1,%0"
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: "+m" (*p)
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: "r" (v)
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: "cc", "memory");
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}
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/*
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* #define atomic_swap_int(P, V) \
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* (return (*(unsigned int *)(P)); *(unsigned int *)(P) = (V);)
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*/
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static inline int atomic_swap_int(unsigned int *p, unsigned int v)
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{
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__asm __volatile(BUS_LOCK "xchgl %1,%0"
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: "+m" (*p), "+r" (v)
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:
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: "cc", "memory");
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return v;
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}
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/*
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* #define atomic_readandclear_int(P) \
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* (return (*(unsigned int *)(P)); *(unsigned int *)(P) = 0;)
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*/
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#define atomic_readandclear_int(p) atomic_swap_int(p, 0)
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/*
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* #define atomic_set_long(P, V) (*(unsigned long *)(P) |= (V))
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*/
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static inline void atomic_set_long(unsigned long *p, unsigned long v)
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{
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__asm __volatile(BUS_LOCK "orq %1,%0"
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: "+m" (*p)
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: "r" (v)
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: "cc", "memory");
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}
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/*
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* #define atomic_clear_long(P, V) (*(u_long *)(P) &= ~(V))
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*/
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static inline void atomic_clear_long(unsigned long *p, unsigned long v)
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{
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__asm __volatile(BUS_LOCK "andq %1,%0"
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: "+m" (*p)
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: "r" (~v)
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: "cc", "memory");
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}
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/*
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* #define atomic_add_long(P, V) (*(unsigned long *)(P) += (V))
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*/
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static inline void atomic_add_long(unsigned long *p, unsigned long v)
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{
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__asm __volatile(BUS_LOCK "addq %1,%0"
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: "+m" (*p)
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: "r" (v)
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: "cc", "memory");
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}
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/*
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* #define atomic_subtract_long(P, V) (*(unsigned long *)(P) -= (V))
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*/
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static inline void atomic_subtract_long(unsigned long *p, unsigned long v)
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{
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__asm __volatile(BUS_LOCK "subq %1,%0"
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: "+m" (*p)
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: "r" (v)
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: "cc", "memory");
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}
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/*
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* #define atomic_swap_long(P, V) \
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* (return (*(unsigned long *)(P)); *(unsigned long *)(P) = (V);)
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*/
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static inline long atomic_swap_long(unsigned long *p, unsigned long v)
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{
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__asm __volatile(BUS_LOCK "xchgq %1,%0"
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: "+m" (*p), "+r" (v)
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:
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: "cc", "memory");
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return v;
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}
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/*
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* #define atomic_readandclear_long(P) \
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* (return (*(unsigned long *)(P)); *(unsigned long *)(P) = 0;)
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*/
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#define atomic_readandclear_long(p) atomic_swap_long(p, 0)
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/*
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* #define atomic_load_acq_int(P) (*(unsigned int*)(P))
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*/
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static inline int atomic_load_acq_int(unsigned int *p)
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{
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int ret;
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__asm __volatile("movl %1,%0"
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: "=r"(ret)
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: "m" (*p)
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: "cc", "memory");
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return ret;
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}
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/*
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* #define atomic_store_rel_int(P, V) (*(unsigned int *)(P) = (V))
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*/
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static inline void atomic_store_rel_int(unsigned int *p, unsigned int v)
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{
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__asm __volatile("movl %1,%0"
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: "=m" (*p)
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: "r" (v)
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: "cc", "memory");
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}
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/*
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* #define atomic_load_acq_long(P) (*(unsigned long*)(P))
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*/
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static inline long atomic_load_acq_long(unsigned long *p)
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{
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long ret;
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__asm __volatile("movq %1,%0"
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: "=r"(ret)
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: "m" (*p)
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: "cc", "memory");
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return ret;
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}
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/*
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* #define atomic_store_rel_long(P, V) (*(unsigned long *)(P) = (V))
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*/
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static inline void atomic_store_rel_long(unsigned long *p, unsigned long v)
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{
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__asm __volatile("movq %1,%0"
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: "=m" (*p)
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: "r" (v)
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: "cc", "memory");
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}
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static inline int atomic_cmpxchg_int(unsigned int *p,
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int old, int new)
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{
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int ret;
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__asm __volatile(BUS_LOCK "cmpxchgl %2,%1"
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: "=a" (ret), "+m" (*p)
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: "r" (new), "0" (old)
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: "memory");
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return ret;
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}
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#define atomic_load_acq_32 atomic_load_acq_int
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#define atomic_store_rel_32 atomic_store_rel_int
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#define atomic_load_acq_64 atomic_load_acq_long
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#define atomic_store_rel_64 atomic_store_rel_long
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/*
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* #define atomic_xadd_int(P, V) \
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* (return (*(unsigned long *)(P)); *(unsigned long *)(P) += (V);)
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*/
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static inline int atomic_xadd_int(unsigned int *p, unsigned int v)
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{
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__asm __volatile(BUS_LOCK "xaddl %0,%1"
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: "+r" (v), "+m" (*p)
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:
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: "cc", "memory");
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return v;
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}
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static inline int atomic_add_return(int v, unsigned int *p)
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{
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return v + atomic_xadd_int(p, v);
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}
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static inline int atomic_sub_return(int v, unsigned int *p)
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{
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return atomic_xadd_int(p, -v) - v;
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}
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#define atomic_inc_return(v) atomic_add_return(1, (v))
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#define atomic_dec_return(v) atomic_sub_return(1, (v))
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static inline int
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atomic_cmpset_long(unsigned long *dst, unsigned long expect, unsigned long src)
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{
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unsigned char res;
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__asm __volatile(BUS_LOCK "cmpxchg %3,%1\n\tsete %0"
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: "=q" (res), "+m" (*dst), "+a" (expect)
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: "r" (src)
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: "memory", "cc");
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return res;
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}
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#endif /* ATOMIC_H*/
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