[mirror_ubuntu-zesty-kernel.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)

#define ARM64_WORKAROUND_CLEAN_CACHE		0
#define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE	1

#define NCAPS					2

#ifndef __ASSEMBLY__

extern DECLARE_BITMAP(cpu_hwcaps, NCAPS);

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

static inline bool cpus_have_cap(unsigned int num)
{
	if (num >= NCAPS)
		return false;
	return test_bit(num, cpu_hwcaps);
}

static inline void cpus_set_cap(unsigned int num)
{
	if (num >= NCAPS)
		pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n",
			num, NCAPS);
	else
		__set_bit(num, cpu_hwcaps);
}

void check_local_cpu_errata(void);

#endif /* __ASSEMBLY__ */

#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
5afaa1fc AP	24	#define ARM64_WORKAROUND_CLEAN_CACHE 0
5afaa1fc AP	25	#define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1
301bcfac	26
5afaa1fc	27	#define NCAPS 2
301bcfac AP	28
301bcfac AP	29	#ifndef __ASSEMBLY__
930da09f AP	30
	31	extern DECLARE_BITMAP(cpu_hwcaps, NCAPS);
	32
3be1a5c4 AB	33	static inline bool cpu_have_feature(unsigned int num)
	34	{
	35	return elf_hwcap & (1UL << num);
	36	}
	37
930da09f AP	38	static inline bool cpus_have_cap(unsigned int num)
	39	{
	40	if (num >= NCAPS)
	41	return false;
	42	return test_bit(num, cpu_hwcaps);
	43	}
	44
	45	static inline void cpus_set_cap(unsigned int num)
	46	{
	47	if (num >= NCAPS)
	48	pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n",
	49	num, NCAPS);
	50	else
	51	__set_bit(num, cpu_hwcaps);
	52	}
	53
e116a375 AP	54	void check_local_cpu_errata(void);
e116a375 AP	55
301bcfac AP	56	#endif /* __ASSEMBLY__ */
301bcfac AP	57
3be1a5c4	58	#endif