1 /* 2 * Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arm_def.h> 8 #include <arm_spm_def.h> 9 #include <debug.h> 10 #include <plat_arm.h> 11 #include <platform_def.h> 12 #include <tzc400.h> 13 14 15 /* Weak definitions may be overridden in specific ARM standard platform */ 16 #pragma weak plat_arm_security_setup 17 18 19 /******************************************************************************* 20 * Initialize the TrustZone Controller for ARM standard platforms. 21 * When booting an EL3 payload, this is simplified: we configure region 0 with 22 * secure access only and do not enable any other region. 23 ******************************************************************************/ 24 void arm_tzc400_setup(const arm_tzc_regions_info_t *tzc_regions) 25 { 26 #ifndef EL3_PAYLOAD_BASE 27 unsigned int region_index = 1U; 28 const arm_tzc_regions_info_t *p; 29 const arm_tzc_regions_info_t init_tzc_regions[] = { 30 ARM_TZC_REGIONS_DEF, 31 {0} 32 }; 33 #endif 34 35 INFO("Configuring TrustZone Controller\n"); 36 37 tzc400_init(PLAT_ARM_TZC_BASE); 38 39 /* Disable filters. */ 40 tzc400_disable_filters(); 41 42 #ifndef EL3_PAYLOAD_BASE 43 if (tzc_regions == NULL) 44 p = init_tzc_regions; 45 else 46 p = tzc_regions; 47 48 /* Region 0 set to no access by default */ 49 tzc400_configure_region0(TZC_REGION_S_NONE, 0); 50 51 /* Rest Regions set according to tzc_regions array */ 52 for (; p->base != 0ULL; p++) { 53 tzc400_configure_region(PLAT_ARM_TZC_FILTERS, region_index, 54 p->base, p->end, p->sec_attr, p->nsaid_permissions); 55 region_index++; 56 } 57 58 INFO("Total %u regions set.\n", region_index); 59 60 #else /* if defined(EL3_PAYLOAD_BASE) */ 61 62 /* Allow Secure and Non-secure access to DRAM for EL3 payloads */ 63 tzc400_configure_region0(TZC_REGION_S_RDWR, PLAT_ARM_TZC_NS_DEV_ACCESS); 64 65 #endif /* EL3_PAYLOAD_BASE */ 66 67 /* 68 * Raise an exception if a NS device tries to access secure memory 69 * TODO: Add interrupt handling support. 70 */ 71 tzc400_set_action(TZC_ACTION_ERR); 72 73 /* Enable filters. */ 74 tzc400_enable_filters(); 75 } 76 77 void plat_arm_security_setup(void) 78 { 79 arm_tzc400_setup(NULL); 80 } 81