/* $Id: x86_compat.h,v 1.33.2.5 2009/01/23 17:01:02 mikpe Exp $

 * Performance-monitoring counters driver.

 * x86/x86_64-specific compatibility definitions for 2.6 kernels.

 *

 * Copyright (C) 2000-2007, 2009  Mikael Pettersson

 */

#include <linux/version.h>

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)

#include <linux/config.h>

#endif

/* missing from <asm-i386/cpufeature.h> */

#define cpu_has_msr	boot_cpu_has(X86_FEATURE_MSR)

/* 2.6.24-rc1 changed cpu_data from behaving like an array indexed

   by cpu to being a macro with a cpu parameter. This emulates the

   macro-with-parameter form in older kernels. */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)

static inline struct cpuinfo_x86 *perfctr_cpu_data(int cpu)

{

	return &cpu_data[cpu];

}

#undef cpu_data

#define cpu_data(cpu)	(*perfctr_cpu_data((cpu)))

#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16) && !defined(CONFIG_X86_64)

/* Stop speculative execution */

static inline void sync_core(void)

{

	int tmp;

	asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory");

}

#endif

/* cpuid_count() was added in the 2.6.12 standard kernel, but it's been

   backported to some distribution kernels including the 2.6.9-22 RHEL4

   kernel. For simplicity, always use our version in older kernels. */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,12)

/* Some CPUID calls want 'count' to be placed in ecx */

static inline void perfctr_cpuid_count(int op, int count, int *eax, int *ebx, int *ecx,

	       	int *edx)

{

	__asm__("cpuid"

		: "=a" (*eax),

		  "=b" (*ebx),

		  "=c" (*ecx),

		  "=d" (*edx)

		: "0" (op), "c" (count));

}

#undef cpuid_count

#define cpuid_count(o,c,eax,ebx,ecx,edx)	perfctr_cpuid_count((o),(c),(eax),(ebx),(ecx),(edx))

#endif

extern unsigned int perfctr_cpu_khz(void);