[deliverable/linux.git] / arch / arm64 / include / asm / cpufeature.h

/*
 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __ASM_CPUFEATURE_H
#define __ASM_CPUFEATURE_H

#include <asm/hwcap.h>

/*
 * In the arm64 world (as in the ARM world), elf_hwcap is used both internally
 * in the kernel and for user space to keep track of which optional features
 * are supported by the current system. So let's map feature 'x' to HWCAP_x.
 * Note that HWCAP_x constants are bit fields so we need to take the log.
 */

#define MAX_CPU_FEATURES	(8 * sizeof(elf_hwcap))
#define cpu_feature(x)		ilog2(HWCAP_ ## x)

static inline bool cpu_have_feature(unsigned int num)
{
	return elf_hwcap & (1UL << num);
}

#endif
Commit	Line	Data
3be1a5c4 AB	1	/*
	2	* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#ifndef __ASM_CPUFEATURE_H
	10	#define __ASM_CPUFEATURE_H
	11
	12	#include <asm/hwcap.h>
	13
	14	/*
	15	* In the arm64 world (as in the ARM world), elf_hwcap is used both internally
	16	* in the kernel and for user space to keep track of which optional features
	17	* are supported by the current system. So let's map feature 'x' to HWCAP_x.
	18	* Note that HWCAP_x constants are bit fields so we need to take the log.
	19	*/
	20
	21	#define MAX_CPU_FEATURES (8 * sizeof(elf_hwcap))
	22	#define cpu_feature(x) ilog2(HWCAP_ ## x)
	23
	24	static inline bool cpu_have_feature(unsigned int num)
	25	{
	26	return elf_hwcap & (1UL << num);
	27	}
	28
	29	#endif