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/*
* Copyright (c) 2014-2015, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arm_def.h>
#include <debug.h>
#include <platform_def.h>
#include <tzc400.h>
/* Weak definitions may be overridden in specific ARM standard platform */
#pragma weak plat_arm_security_setup
/*******************************************************************************
* Initialize the TrustZone Controller for ARM standard platforms.
* Configure:
* - Region 0 with no access;
* - Region 1 with secure access only;
* - the remaining DRAM regions access from the given Non-Secure masters.
*
* When booting an EL3 payload, this is simplified: we configure region 0 with
* secure access only and do not enable any other region.
******************************************************************************/
void arm_tzc400_setup(void)
{
INFO("Configuring TrustZone Controller\n");
tzc400_init(PLAT_ARM_TZC_BASE);
/* Disable filters. */
tzc400_disable_filters();
#ifndef EL3_PAYLOAD_BASE
/* Region 0 set to no access by default */
tzc400_configure_region0(TZC_REGION_S_NONE, 0);
/* Region 1 set to cover Secure part of DRAM */
tzc400_configure_region(PLAT_ARM_TZC_FILTERS, 1,
ARM_AP_TZC_DRAM1_BASE, ARM_AP_TZC_DRAM1_END,
TZC_REGION_S_RDWR,
0);
/* Region 2 set to cover Non-Secure access to 1st DRAM address range.
* Apply the same configuration to given filters in the TZC. */
tzc400_configure_region(PLAT_ARM_TZC_FILTERS, 2,
ARM_NS_DRAM1_BASE, ARM_NS_DRAM1_END,
TZC_REGION_S_NONE,
PLAT_ARM_TZC_NS_DEV_ACCESS);
/* Region 3 set to cover Non-Secure access to 2nd DRAM address range */
tzc400_configure_region(PLAT_ARM_TZC_FILTERS, 3,
ARM_DRAM2_BASE, ARM_DRAM2_END,
TZC_REGION_S_NONE,
PLAT_ARM_TZC_NS_DEV_ACCESS);
#else
/* Allow secure access only to DRAM for EL3 payloads. */
tzc400_configure_region0(TZC_REGION_S_RDWR, 0);
#endif /* EL3_PAYLOAD_BASE */
/*
* Raise an exception if a NS device tries to access secure memory
* TODO: Add interrupt handling support.
*/
tzc400_set_action(TZC_ACTION_ERR);
/* Enable filters. */
tzc400_enable_filters();
}
void plat_arm_security_setup(void)
{
arm_tzc400_setup();
}
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