common.h

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/*
 * x86_64/common.h
 * Common X86-64 configuration information.
 *
 * Copyright (c) 2002
 *	MandrakeSoft.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file.
 */

#ifndef __x86_64_common_h
#define __x86_64_common_h

/* Stack must be aligned on 16-bytes boundary.  */
#define NEED_STACK_ALIGN
#define STACK_ALIGN(p)  ((((unsigned long)(p)) & 15) ^ (unsigned long)(p))

#if NEED_sysdepCallMethod
#include "sysdepCallMethod.h"
#endif

#if defined(__GNUC__)
#define KAFFE_PROFILER 1
#endif

#if defined(KAFFE_PROFILER)

/* Profiler clicks counter type.  */
typedef uint64 profiler_click_t;

/* ReaD the processor Time Stamp Counter.
 * This is a macro to help GCC optimization.
 * The rdtsc instruction load TSC to edx:eax aka A register.  */
#define profiler_get_clicks(COUNTER) \
        asm volatile ("rdtsc" : "=A" (COUNTER))

#endif

#if defined(__GNUC__)
/*
 * Do an atomic compare and exchange.  The address 'A' is checked against  
 * value 'O' and if they match it's exchanged with value 'N'.
 * We return '1' if the exchange is sucessful, otherwise 0.
 */
#define COMPARE_AND_EXCHANGE(A,O,N)                             \
        ({ char ret;                                            \
           asm volatile ("lock ; cmpxchgq %2,%1 ; sete %0"      \
                         : "=q" (ret), "+m" (*(A))              \
                         : "r" (N), "a" (O)                     \
                         : "cc", "memory");                     \
           (ret);                                               \
        })
#endif

#endif