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1 /*
2  * Copyright (c) 2014-2020, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <platform_def.h>
8 
9 #include <common/debug.h>
10 #include <drivers/arm/tzc400.h>
11 #include <plat/arm/common/plat_arm.h>
12 
13 /* Weak definitions may be overridden in specific ARM standard platform */
14 #pragma weak plat_arm_security_setup
15 
16 
17 /*******************************************************************************
18  * Initialize the TrustZone Controller for ARM standard platforms.
19  * When booting an EL3 payload, this is simplified: we configure region 0 with
20  * secure access only and do not enable any other region.
21  ******************************************************************************/
arm_tzc400_setup(uintptr_t tzc_base,const arm_tzc_regions_info_t * tzc_regions)22 void arm_tzc400_setup(uintptr_t tzc_base,
23 			const arm_tzc_regions_info_t *tzc_regions)
24 {
25 #ifndef EL3_PAYLOAD_BASE
26 	unsigned int region_index = 1U;
27 	const arm_tzc_regions_info_t *p;
28 	const arm_tzc_regions_info_t init_tzc_regions[] = {
29 		ARM_TZC_REGIONS_DEF,
30 		{0}
31 	};
32 #endif
33 
34 	INFO("Configuring TrustZone Controller\n");
35 
36 	tzc400_init(tzc_base);
37 
38 	/* Disable filters. */
39 	tzc400_disable_filters();
40 
41 #ifndef EL3_PAYLOAD_BASE
42 	if (tzc_regions == NULL)
43 		p = init_tzc_regions;
44 	else
45 		p = tzc_regions;
46 
47 	/* Region 0 set to no access by default */
48 	tzc400_configure_region0(TZC_REGION_S_NONE, 0);
49 
50 	/* Rest Regions set according to tzc_regions array */
51 	for (; p->base != 0ULL; p++) {
52 		tzc400_configure_region(PLAT_ARM_TZC_FILTERS, region_index,
53 			p->base, p->end, p->sec_attr, p->nsaid_permissions);
54 		region_index++;
55 	}
56 
57 	INFO("Total %u regions set.\n", region_index);
58 
59 #else /* if defined(EL3_PAYLOAD_BASE) */
60 
61 	/* Allow Secure and Non-secure access to DRAM for EL3 payloads */
62 	tzc400_configure_region0(TZC_REGION_S_RDWR, PLAT_ARM_TZC_NS_DEV_ACCESS);
63 
64 #endif /* EL3_PAYLOAD_BASE */
65 
66 	/*
67 	 * Raise an exception if a NS device tries to access secure memory
68 	 * TODO: Add interrupt handling support.
69 	 */
70 	tzc400_set_action(TZC_ACTION_ERR);
71 
72 	/* Enable filters. */
73 	tzc400_enable_filters();
74 }
75 
plat_arm_security_setup(void)76 void plat_arm_security_setup(void)
77 {
78 	arm_tzc400_setup(PLAT_ARM_TZC_BASE, NULL);
79 }
80