u-boot/arch/arm/include/asm/armv7m_mpu.h

/*
 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
 * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

enum region_number {
	REGION_0 = 0,
	REGION_1,
	REGION_2,
	REGION_3,
	REGION_4,
	REGION_5,
	REGION_6,
	REGION_7,
};

enum ap {
	NO_ACCESS = 0,
	PRIV_RW_USR_NO,
	PRIV_RW_USR_RO,
	PRIV_RW_USR_RW,
	UNPREDICTABLE,
	PRIV_RO_USR_NO,
	PRIV_RO_USR_RO,
};

enum mr_attr {
	STRONG_ORDER = 0,
	SHARED_WRITE_BUFFERED,
	O_I_WT_NO_WR_ALLOC,
	O_I_WB_NO_WR_ALLOC,
	O_I_NON_CACHEABLE,
	O_I_WB_RD_WR_ALLOC,
	DEVICE_NON_SHARED,
};
enum size {
	REGION_8MB = 22,
	REGION_16MB,
	REGION_32MB,
	REGION_64MB,
	REGION_128MB,
	REGION_256MB,
	REGION_512MB,
	REGION_1GB,
	REGION_2GB,
	REGION_4GB,
};

enum xn {
	XN_DIS = 0,
	XN_EN,
};

struct mpu_region_config {
	uint32_t start_addr;
	enum region_number region_no;
	enum xn xn;
	enum ap ap;
	enum mr_attr mr_attr;
	enum size reg_size;
};

void disable_mpu(void);
void enable_mpu(void);
void mpu_config(struct mpu_region_config *reg_config);