1 /* 2 * Copyright (c) 2018-2020, 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 <tools_share/firmware_encrypted.h> 15 16 /* 17 * The following platform functions are weakly defined. The Platforms 18 * may redefine with strong definition. 19 */ 20 #pragma weak bl2_el3_plat_prepare_exit 21 #pragma weak plat_error_handler 22 #pragma weak bl2_plat_preload_setup 23 #pragma weak bl2_plat_handle_pre_image_load 24 #pragma weak bl2_plat_handle_post_image_load 25 #pragma weak plat_try_next_boot_source 26 #pragma weak plat_get_enc_key_info 27 28 void bl2_el3_plat_prepare_exit(void) 29 { 30 } 31 32 void __dead2 plat_error_handler(int err) 33 { 34 while (1) 35 wfi(); 36 } 37 38 void bl2_plat_preload_setup(void) 39 { 40 } 41 42 int bl2_plat_handle_pre_image_load(unsigned int image_id) 43 { 44 return 0; 45 } 46 47 int bl2_plat_handle_post_image_load(unsigned int image_id) 48 { 49 return 0; 50 } 51 52 int plat_try_next_boot_source(void) 53 { 54 return 0; 55 } 56 57 /* 58 * Weak implementation to provide dummy decryption key only for test purposes, 59 * platforms must override this API for any real world firmware encryption 60 * use-case. 61 */ 62 int plat_get_enc_key_info(enum fw_enc_status_t fw_enc_status, uint8_t *key, 63 size_t *key_len, unsigned int *flags, 64 const uint8_t *img_id, size_t img_id_len) 65 { 66 #define DUMMY_FIP_ENC_KEY { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, \ 67 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, \ 68 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, \ 69 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef } 70 71 const uint8_t dummy_key[] = DUMMY_FIP_ENC_KEY; 72 73 assert(*key_len >= sizeof(dummy_key)); 74 75 *key_len = sizeof(dummy_key); 76 memcpy(key, dummy_key, *key_len); 77 *flags = 0; 78 79 return 0; 80 } 81 82 /* 83 * Set up the page tables for the generic and platform-specific memory regions. 84 * The size of the Trusted SRAM seen by the BL image must be specified as well 85 * as an array specifying the generic memory regions which can be; 86 * - Code section; 87 * - Read-only data section; 88 * - Init code section, if applicable 89 * - Coherent memory region, if applicable. 90 */ 91 92 void __init setup_page_tables(const mmap_region_t *bl_regions, 93 const mmap_region_t *plat_regions) 94 { 95 #if LOG_LEVEL >= LOG_LEVEL_VERBOSE 96 const mmap_region_t *regions = bl_regions; 97 98 while (regions->size != 0U) { 99 VERBOSE("Region: 0x%lx - 0x%lx has attributes 0x%x\n", 100 regions->base_va, 101 regions->base_va + regions->size, 102 regions->attr); 103 regions++; 104 } 105 #endif 106 /* 107 * Map the Trusted SRAM with appropriate memory attributes. 108 * Subsequent mappings will adjust the attributes for specific regions. 109 */ 110 mmap_add(bl_regions); 111 112 /* Now (re-)map the platform-specific memory regions */ 113 mmap_add(plat_regions); 114 115 /* Create the page tables to reflect the above mappings */ 116 init_xlat_tables(); 117 } 118