Chloe M.
44 lines
727 B
C
44 lines
727 B
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause.
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*
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* Description: Processor primitives
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* Author: Chloe M.
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*/
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#ifndef _MACHINE_PRIM_H_
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#define _MACHINE_PRIM_H_ 1
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#include <stdef.h>
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#define MdCpuSuspend() ASMV("hlt")
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#define MdCpuSpinWait() ASMV("pause")
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/*
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* Atomic swap operation
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*
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* @Ptr: Location to swap with @Value
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* @Value: Value to swap to @Ptr
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*/
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ALWAYS_INLINE static inline QUAD
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MdCpuAswap(QUAD *Ptr, QUAD Value)
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{
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QUAD RetVal;
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if (Ptr == NULL) {
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return 0;
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}
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RetVal = *(volatile QUAD *)Ptr;
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ASMV(
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"xchg %0, %1\n"
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: "+m" (*Ptr), "+r" (Value)
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:
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: "memory"
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);
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return RetVal;
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}
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#endif /* !_MACHINE_PRIM_H_ */
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