1 /*
2 * Copyright (c) 2018-2024, Arm Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8
9 #include <arch_helpers.h>
10 #include <common/bl_common.h>
11 #include <common/debug.h>
12 #include <lib/xlat_tables/xlat_tables_compat.h>
13 #include <plat/common/platform.h>
14 #include <services/arm_arch_svc.h>
15 #include <smccc_helpers.h>
16 #include <tools_share/firmware_encrypted.h>
17
18 /*
19 * The following platform functions are weakly defined. The Platforms
20 * may redefine with strong definition.
21 */
22 #pragma weak bl2_el3_plat_prepare_exit
23 #pragma weak plat_error_handler
24 #pragma weak bl2_plat_preload_setup
25 #pragma weak bl2_plat_handle_pre_image_load
26 #pragma weak bl2_plat_handle_post_image_load
27 #pragma weak plat_get_enc_key_info
28 #pragma weak plat_is_smccc_feature_available
29 #pragma weak plat_get_soc_version
30 #pragma weak plat_get_soc_revision
31
plat_get_soc_version(void)32 int32_t plat_get_soc_version(void)
33 {
34 return SMC_ARCH_CALL_NOT_SUPPORTED;
35 }
36
plat_get_soc_revision(void)37 int32_t plat_get_soc_revision(void)
38 {
39 return SMC_ARCH_CALL_NOT_SUPPORTED;
40 }
41
plat_is_smccc_feature_available(u_register_t fid __unused)42 int32_t plat_is_smccc_feature_available(u_register_t fid __unused)
43 {
44 return SMC_ARCH_CALL_NOT_SUPPORTED;
45 }
46
bl2_el3_plat_prepare_exit(void)47 void bl2_el3_plat_prepare_exit(void)
48 {
49 }
50
plat_error_handler(int err)51 void __dead2 plat_error_handler(int err)
52 {
53 while (1)
54 wfi();
55 }
56
bl2_plat_preload_setup(void)57 void bl2_plat_preload_setup(void)
58 {
59 }
60
bl2_plat_handle_pre_image_load(unsigned int image_id)61 int bl2_plat_handle_pre_image_load(unsigned int image_id)
62 {
63 return 0;
64 }
65
bl2_plat_handle_post_image_load(unsigned int image_id)66 int bl2_plat_handle_post_image_load(unsigned int image_id)
67 {
68 return 0;
69 }
70
71 /*
72 * Weak implementation to provide dummy decryption key only for test purposes,
73 * platforms must override this API for any real world firmware encryption
74 * use-case.
75 */
plat_get_enc_key_info(enum fw_enc_status_t fw_enc_status,uint8_t * key,size_t * key_len,unsigned int * flags,const uint8_t * img_id,size_t img_id_len)76 int plat_get_enc_key_info(enum fw_enc_status_t fw_enc_status, uint8_t *key,
77 size_t *key_len, unsigned int *flags,
78 const uint8_t *img_id, size_t img_id_len)
79 {
80 #define DUMMY_FIP_ENC_KEY { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, \
81 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, \
82 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, \
83 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef }
84
85 const uint8_t dummy_key[] = DUMMY_FIP_ENC_KEY;
86
87 assert(*key_len >= sizeof(dummy_key));
88
89 *key_len = sizeof(dummy_key);
90 memcpy(key, dummy_key, *key_len);
91 *flags = 0;
92
93 return 0;
94 }
95
96 /*
97 * Set up the page tables for the generic and platform-specific memory regions.
98 * The size of the Trusted SRAM seen by the BL image must be specified as well
99 * as an array specifying the generic memory regions which can be;
100 * - Code section;
101 * - Read-only data section;
102 * - Init code section, if applicable
103 * - Coherent memory region, if applicable.
104 */
105
setup_page_tables(const mmap_region_t * bl_regions,const mmap_region_t * plat_regions)106 void __init setup_page_tables(const mmap_region_t *bl_regions,
107 const mmap_region_t *plat_regions)
108 {
109 #if LOG_LEVEL >= LOG_LEVEL_VERBOSE
110 const mmap_region_t *regions = bl_regions;
111
112 while (regions->size != 0U) {
113 VERBOSE("Region: 0x%lx - 0x%lx has attributes 0x%x\n",
114 regions->base_va,
115 regions->base_va + regions->size,
116 regions->attr);
117 regions++;
118 }
119 #endif
120 /*
121 * Map the Trusted SRAM with appropriate memory attributes.
122 * Subsequent mappings will adjust the attributes for specific regions.
123 */
124 mmap_add(bl_regions);
125
126 /* Now (re-)map the platform-specific memory regions */
127 mmap_add(plat_regions);
128
129 /* Create the page tables to reflect the above mappings */
130 init_xlat_tables();
131 }
132