arch/arm/include/asm/arch-imx8/cpu.h

/*
 * Copyright 2017 NXP
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#define MIDR_PARTNUM_CORTEX_A35 0xD04
#define MIDR_PARTNUM_CORTEX_A53 0xD03
#define MIDR_PARTNUM_CORTEX_A72 0xD08
#define MIDR_PARTNUM_SHIFT 0x4
#define MIDR_PARTNUM_MASK (0xFFF << 0x4)

static inline unsigned int read_midr(void)
{
	unsigned long val;

	asm volatile("mrs %0, midr_el1" : "=r" (val));

	return val;
}

#define is_cortex_a35() (((read_midr() & MIDR_PARTNUM_MASK) >> MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A35)
#define is_cortex_a53() (((read_midr() & MIDR_PARTNUM_MASK) >> MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A53)
#define is_cortex_a72() (((read_midr() & MIDR_PARTNUM_MASK) >> MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A72)

u32 cpu_mask(void);