soc.c
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/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/armv7m_mpu.h>
int arch_cpu_init(void)
{
int i;
struct mpu_region_config stm32_region_config[] = {
/*
* Make all 4GB cacheable & executable. We are overriding it
* with next region for any requirement. e.g. below region1,
* 2 etc.
* In other words, the area not coming in following
* regions configuration is the one configured here in region_0
* (cacheable & executable).
*/
{ 0x00000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
O_I_WB_RD_WR_ALLOC, REGION_4GB },
/* armv7m code area */
{ 0x00000000, REGION_1, XN_DIS, PRIV_RW_USR_RW,
STRONG_ORDER, REGION_512MB },
/* Device area : Not executable */
{ 0x40000000, REGION_2, XN_EN, PRIV_RW_USR_RW,
DEVICE_NON_SHARED, REGION_512MB },
/*
* Armv7m fixed configuration: strongly ordered & not
* executable, not cacheable
*/
{ 0xE0000000, REGION_3, XN_EN, PRIV_RW_USR_RW,
STRONG_ORDER, REGION_512MB },
#if !defined(CONFIG_STM32H7)
/* Device area : Not executable */
{ 0xA0000000, REGION_4, XN_EN, PRIV_RW_USR_RW,
DEVICE_NON_SHARED, REGION_512MB },
#endif
};
disable_mpu();
for (i = 0; i < ARRAY_SIZE(stm32_region_config); i++)
mpu_config(&stm32_region_config[i]);
enable_mpu();
return 0;
}