1 // SPDX-License-Identifier: BSD-3-Clause 2 /* 3 * Copyright (c) 2020-2023, ARM Limited. All rights reserved. 4 * Copyright (c) 2025, NVIDIA Corporation & AFFILIATES. 5 */ 6 7 #include <compiler.h> 8 #include <kernel/dt.h> 9 #include <kernel/tpm.h> 10 #include <libfdt.h> 11 #include <mm/core_memprot.h> 12 #include <string.h> 13 14 static void *tpm_log_addr; 15 static size_t tpm_log_size; 16 17 /* 18 * Check whether the node at @offs contains TPM Event Log information or not. 19 * 20 * @offs is the offset of the node that describes the device in @fdt. 21 * @buf will contain the phy address of the TPM Event log. 22 * @size will contain the size of the mapped area. 23 * 24 * Returns the size of the mapped area or < 0 on failure. 25 */ 26 #ifdef CFG_DT 27 static int read_dt_tpm_log_info(void *fdt, int node, paddr_t *buf, 28 size_t *size) 29 { 30 const uint32_t *property = NULL; 31 const uint64_t zero_addr = 0; 32 int len_prop = 0; 33 paddr_t log_addr = 0; 34 int err = 0; 35 #ifdef CFG_MAP_EXT_DT_SECURE 36 const char *dt_tpm_event_log_addr = "tpm_event_log_addr"; 37 #else 38 const char *dt_tpm_event_log_addr = "tpm_event_log_sm_addr"; 39 #endif 40 41 /* 42 * Get the TPM Log address. 43 */ 44 property = fdt_getprop(fdt, node, dt_tpm_event_log_addr, &len_prop); 45 46 if (!property || len_prop != sizeof(uint32_t) * 2) 47 return -1; 48 49 log_addr = fdt32_to_cpu(property[1]); 50 51 if (!IS_ENABLED(CFG_CORE_FFA)) { 52 err = fdt_setprop(fdt, node, dt_tpm_event_log_addr, &zero_addr, 53 sizeof(uint32_t) * 2); 54 if (err < 0) { 55 EMSG("Error setting property DTB to zero"); 56 return err; 57 } 58 } 59 60 /* 61 * Get the TPM Log size. 62 */ 63 property = fdt_getprop(fdt, node, "tpm_event_log_size", &len_prop); 64 65 if (!property || len_prop != sizeof(uint32_t)) 66 return -1; 67 68 *size = fdt32_to_cpu(property[0]); 69 *buf = log_addr; 70 71 return *size; 72 } 73 #endif 74 75 static void get_tpm_phys_params(void *fdt __maybe_unused, 76 paddr_t *addr, size_t *size) 77 { 78 #ifdef CFG_DT 79 int node = 0; 80 const char *dt_tpm_match_table = { 81 "arm,tpm_event_log", 82 }; 83 84 if (!fdt) { 85 EMSG("TPM: No DTB found"); 86 return; 87 } 88 89 node = fdt_node_offset_by_compatible(fdt, -1, dt_tpm_match_table); 90 91 if (node < 0) { 92 EMSG("TPM: Fail to find TPM node %i", node); 93 return; 94 } 95 96 if (read_dt_tpm_log_info((void *)fdt, node, addr, size) < 0) { 97 EMSG("TPM: Fail to retrieve DTB properties from node %i", 98 node); 99 return; 100 } 101 #else 102 *size = CFG_TPM_MAX_LOG_SIZE; 103 *addr = CFG_TPM_LOG_BASE_ADDR; 104 #endif /* CFG_DT */ 105 } 106 107 TEE_Result tpm_get_event_log(void *buf, size_t *size) 108 { 109 const size_t buf_size = *size; 110 111 *size = tpm_log_size; 112 if (!buf) { 113 EMSG("TPM: Invalid buffer"); 114 return TEE_ERROR_BAD_PARAMETERS; 115 } 116 117 if (buf_size < tpm_log_size) { 118 EMSG("TPM: Not enough space for the log: %zu, %zu", 119 buf_size, tpm_log_size); 120 return TEE_ERROR_SHORT_BUFFER; 121 } 122 123 memcpy(buf, tpm_log_addr, tpm_log_size); 124 125 return TEE_SUCCESS; 126 } 127 128 TEE_Result tpm_get_event_log_size(size_t *size) 129 { 130 *size = tpm_log_size; 131 132 return TEE_SUCCESS; 133 } 134 135 void tpm_map_log_area(void *fdt) 136 { 137 paddr_t log_addr = 0; 138 unsigned int rounded_size = 0; 139 140 get_tpm_phys_params(fdt, &log_addr, &tpm_log_size); 141 142 DMSG("TPM Event log PA: %#" PRIxPA, log_addr); 143 DMSG("TPM Event log size: %zu Bytes", tpm_log_size); 144 145 rounded_size = ROUNDUP(tpm_log_size, SMALL_PAGE_SIZE); 146 147 tpm_log_addr = core_mmu_add_mapping(MEM_AREA_RAM_SEC, log_addr, 148 rounded_size); 149 if (!tpm_log_addr) { 150 EMSG("TPM: Failed to map TPM log memory"); 151 return; 152 } 153 } 154