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path: root/platform/ext/target/arm/mps2/an519/tfm_hal_isolation.c
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/*
 * Copyright (c) 2020, Arm Limited. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 */

#include "cmsis.h"
#include "Driver_Common.h"
#include "mpu_armv8m_drv.h"
#include "region.h"
#include "target_cfg.h"
#include "tfm_hal_isolation.h"

#ifdef CONFIG_TFM_ENABLE_MEMORY_PROTECT
#define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))

#define MPU_REGION_VENEERS           0
#define MPU_REGION_TFM_UNPRIV_CODE   1
#define MPU_REGION_NS_STACK          2
#define PARTITION_REGION_RO          3
#define PARTITION_REGION_RW_STACK    4
#define PARTITION_REGION_PERIPH      5
#ifdef TFM_SP_META_PTR_ENABLE
#define MPU_REGION_SP_META_PTR       7
#endif /* TFM_SP_META_PTR_ENABLE */

REGION_DECLARE(Load$$LR$$, LR_VENEER, $$Base);
REGION_DECLARE(Load$$LR$$, LR_VENEER, $$Limit);
REGION_DECLARE(Image$$, TFM_UNPRIV_CODE, $$RO$$Base);
REGION_DECLARE(Image$$, TFM_UNPRIV_CODE, $$RO$$Limit);
REGION_DECLARE(Image$$, TFM_APP_CODE_START, $$Base);
REGION_DECLARE(Image$$, TFM_APP_CODE_END, $$Base);
REGION_DECLARE(Image$$, TFM_APP_RW_STACK_START, $$Base);
REGION_DECLARE(Image$$, TFM_APP_RW_STACK_END, $$Base);
REGION_DECLARE(Image$$, ARM_LIB_STACK, $$ZI$$Base);
REGION_DECLARE(Image$$, ARM_LIB_STACK, $$ZI$$Limit);
#ifdef TFM_SP_META_PTR_ENABLE
REGION_DECLARE(Image$$, TFM_SP_META_PTR, $$RW$$Base);
REGION_DECLARE(Image$$, TFM_SP_META_PTR, $$RW$$Limit);
#endif /* TFM_SP_META_PTR_ENABLE */

const struct mpu_armv8m_region_cfg_t region_cfg[] = {
    /* Veneer region */
    {
        MPU_REGION_VENEERS,
        (uint32_t)&REGION_NAME(Load$$LR$$, LR_VENEER, $$Base),
        (uint32_t)&REGION_NAME(Load$$LR$$, LR_VENEER, $$Limit),
        MPU_ARMV8M_MAIR_ATTR_CODE_IDX,
        MPU_ARMV8M_XN_EXEC_OK,
        MPU_ARMV8M_AP_RO_PRIV_UNPRIV,
        MPU_ARMV8M_SH_NONE
    },
    /* TFM Core unprivileged code region */
    {
        MPU_REGION_TFM_UNPRIV_CODE,
        (uint32_t)&REGION_NAME(Image$$, TFM_UNPRIV_CODE, $$RO$$Base),
        (uint32_t)&REGION_NAME(Image$$, TFM_UNPRIV_CODE, $$RO$$Limit),
        MPU_ARMV8M_MAIR_ATTR_CODE_IDX,
        MPU_ARMV8M_XN_EXEC_OK,
        MPU_ARMV8M_AP_RO_PRIV_UNPRIV,
        MPU_ARMV8M_SH_NONE
    },
    /* NSPM PSP */
    {
        MPU_REGION_NS_STACK,
        (uint32_t)&REGION_NAME(Image$$, ARM_LIB_STACK, $$ZI$$Base),
        (uint32_t)&REGION_NAME(Image$$, ARM_LIB_STACK, $$ZI$$Limit),
        MPU_ARMV8M_MAIR_ATTR_DATA_IDX,
        MPU_ARMV8M_XN_EXEC_NEVER,
        MPU_ARMV8M_AP_RW_PRIV_UNPRIV,
        MPU_ARMV8M_SH_NONE
    },
    /* RO region */
    {
        PARTITION_REGION_RO,
        (uint32_t)&REGION_NAME(Image$$, TFM_APP_CODE_START, $$Base),
        (uint32_t)&REGION_NAME(Image$$, TFM_APP_CODE_END, $$Base),
        MPU_ARMV8M_MAIR_ATTR_CODE_IDX,
        MPU_ARMV8M_XN_EXEC_OK,
        MPU_ARMV8M_AP_RO_PRIV_UNPRIV,
        MPU_ARMV8M_SH_NONE
    },
    /* RW, ZI and stack as one region */
    {
        PARTITION_REGION_RW_STACK,
        (uint32_t)&REGION_NAME(Image$$, TFM_APP_RW_STACK_START, $$Base),
        (uint32_t)&REGION_NAME(Image$$, TFM_APP_RW_STACK_END, $$Base),
        MPU_ARMV8M_MAIR_ATTR_DATA_IDX,
        MPU_ARMV8M_XN_EXEC_NEVER,
        MPU_ARMV8M_AP_RW_PRIV_UNPRIV,
        MPU_ARMV8M_SH_NONE
    },
#ifdef TFM_SP_META_PTR_ENABLE
    /* TFM partition metadata pointer region */
    {
        MPU_REGION_SP_META_PTR,
        (uint32_t)&REGION_NAME(Image$$, TFM_SP_META_PTR, $$RW$$Base),
        (uint32_t)&REGION_NAME(Image$$, TFM_SP_META_PTR, $$RW$$Limit),
        MPU_ARMV8M_MAIR_ATTR_DATA_IDX,
        MPU_ARMV8M_XN_EXEC_NEVER,
        MPU_ARMV8M_AP_RW_PRIV_UNPRIV,
        MPU_ARMV8M_SH_NONE
    }
#endif
};
#endif /* CONFIG_TFM_ENABLE_MEMORY_PROTECT */

enum tfm_hal_status_t tfm_hal_set_up_static_boundaries(void)
{
    /* Set up isolation boundaries between SPE and NSPE */
    sau_and_idau_cfg();
    if (mpc_init_cfg() != ARM_DRIVER_OK) {
        return TFM_HAL_ERROR_GENERIC;
    }
    ppc_init_cfg();

    /* Set up static isolation boundaries inside SPE */
#ifdef CONFIG_TFM_ENABLE_MEMORY_PROTECT
    struct mpu_armv8m_dev_t dev_mpu_s = { MPU_BASE };
    int32_t i;

    mpu_armv8m_clean(&dev_mpu_s);

    for (i = 0; i < ARRAY_SIZE(region_cfg); i++) {
        if (mpu_armv8m_region_enable(&dev_mpu_s,
            (struct mpu_armv8m_region_cfg_t *)&region_cfg[i])
            != MPU_ARMV8M_OK) {
            return TFM_HAL_ERROR_GENERIC;
        }
    }

    mpu_armv8m_enable(&dev_mpu_s, PRIVILEGED_DEFAULT_ENABLE,
                      HARDFAULT_NMI_ENABLE);
#endif /* CONFIG_TFM_ENABLE_MEMORY_PROTECT */

    return TFM_HAL_SUCCESS;
}