linux-kernel - [sample] A sample program for MRS emulation

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Date:   Wed, 30 Nov 2016 15:15:01 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, catalin.marinas@....com,
        dave.martin@....com, aph@...hat.com, will.deacon@....com,
        ryan.arnold@...aro.org, sid@...erved-bit.com,
        adhemerval.zanella@...aro.org, mark.rutland@....com,
        marc.zyngier@....com, Suzuki K Poulose <suzuki.poulose@....com>
Subject: [sample] A sample program for MRS emulation

Here is a sample program which demonstrates how to use mrs
emulation to fetch the ID registers.

----8>----
/*
 * Sample program to demonstrate the MRS emulation
 * ABI.
 * Copyright (C) 2015-2016, ARM Ltd
 *
 * Author: Suzuki K Poulose <suzuki.poulose@....com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <stdio.h>

#define get_cpu_ftr(id) ({					\
		unsigned long long __val;			\
		asm("mrs %0, "#id : "=r" (__val));		\
		printf("%-20s: 0x%016lx\n", #id, __val);	\
	})

int main()
{

	get_cpu_ftr(ID_AA64ISAR0_EL1);
	get_cpu_ftr(ID_AA64ISAR1_EL1);
	get_cpu_ftr(ID_AA64MMFR0_EL1);
	get_cpu_ftr(ID_AA64MMFR1_EL1);
	get_cpu_ftr(ID_AA64PFR0_EL1);
	get_cpu_ftr(ID_AA64PFR1_EL1);
	get_cpu_ftr(ID_AA64DFR0_EL1);
	get_cpu_ftr(ID_AA64DFR1_EL1);

	get_cpu_ftr(MIDR_EL1);
	get_cpu_ftr(MPIDR_EL1);
	get_cpu_ftr(REVIDR_EL1);
	return 0;
}