1 /* 2 * Copyright 2016 NXP Semiconductor, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <errno.h> 9 #include <linux/kernel.h> 10 #include <asm/io.h> 11 #include <asm/system.h> 12 #include <asm/types.h> 13 #include <asm/macro.h> 14 #include <asm/armv8/sec_firmware.h> 15 16 DECLARE_GLOBAL_DATA_PTR; 17 extern void c_runtime_cpu_setup(void); 18 19 #define SEC_FIRMWARE_LOADED 0x1 20 #define SEC_FIRMWARE_RUNNING 0x2 21 #define SEC_FIRMWARE_ADDR_MASK (~0x3) 22 /* 23 * Secure firmware load addr 24 * Flags used: 0x1 secure firmware has been loaded to secure memory 25 * 0x2 secure firmware is running 26 */ 27 phys_addr_t sec_firmware_addr; 28 29 static int sec_firmware_get_data(const void *sec_firmware_img, 30 const void **data, size_t *size) 31 { 32 int conf_node_off, fw_node_off; 33 char *conf_node_name = NULL; 34 char *desc; 35 int ret; 36 37 conf_node_name = SEC_FIRMEWARE_FIT_CNF_NAME; 38 39 conf_node_off = fit_conf_get_node(sec_firmware_img, conf_node_name); 40 if (conf_node_off < 0) { 41 printf("SEC Firmware: %s: no such config\n", conf_node_name); 42 return -ENOENT; 43 } 44 45 fw_node_off = fit_conf_get_prop_node(sec_firmware_img, conf_node_off, 46 SEC_FIRMWARE_FIT_IMAGE); 47 if (fw_node_off < 0) { 48 printf("SEC Firmware: No '%s' in config\n", 49 SEC_FIRMWARE_FIT_IMAGE); 50 return -ENOLINK; 51 } 52 53 /* Verify secure firmware image */ 54 if (!(fit_image_verify(sec_firmware_img, fw_node_off))) { 55 printf("SEC Firmware: Bad firmware image (bad CRC)\n"); 56 return -EINVAL; 57 } 58 59 if (fit_image_get_data(sec_firmware_img, fw_node_off, data, size)) { 60 printf("SEC Firmware: Can't get %s subimage data/size", 61 SEC_FIRMWARE_FIT_IMAGE); 62 return -ENOENT; 63 } 64 65 ret = fit_get_desc(sec_firmware_img, fw_node_off, &desc); 66 if (ret) 67 printf("SEC Firmware: Can't get description\n"); 68 else 69 printf("%s\n", desc); 70 71 return ret; 72 } 73 74 /* 75 * SEC Firmware FIT image parser checks if the image is in FIT 76 * format, verifies integrity of the image and calculates raw 77 * image address and size values. 78 * 79 * Returns 0 on success and a negative errno on error task fail. 80 */ 81 static int sec_firmware_parse_image(const void *sec_firmware_img, 82 const void **raw_image_addr, 83 size_t *raw_image_size) 84 { 85 int ret; 86 87 ret = sec_firmware_get_data(sec_firmware_img, raw_image_addr, 88 raw_image_size); 89 if (ret) 90 return ret; 91 92 debug("SEC Firmware: raw_image_addr = 0x%p, raw_image_size = 0x%lx\n", 93 *raw_image_addr, *raw_image_size); 94 95 return 0; 96 } 97 98 static int sec_firmware_copy_image(const char *title, 99 u64 image_addr, u32 image_size, u64 sec_firmware) 100 { 101 debug("%s copied to address 0x%p\n", title, (void *)sec_firmware); 102 memcpy((void *)sec_firmware, (void *)image_addr, image_size); 103 flush_dcache_range(sec_firmware, sec_firmware + image_size); 104 105 return 0; 106 } 107 108 /* 109 * This function will parse the SEC Firmware image, and then load it 110 * to secure memory. 111 */ 112 static int sec_firmware_load_image(const void *sec_firmware_img) 113 { 114 const void *raw_image_addr; 115 size_t raw_image_size = 0; 116 int ret; 117 118 /* 119 * The Excetpion Level must be EL3 to load and initialize 120 * the SEC Firmware. 121 */ 122 if (current_el() != 3) { 123 ret = -EACCES; 124 goto out; 125 } 126 127 #ifdef CONFIG_SYS_MEM_RESERVE_SECURE 128 /* 129 * The SEC Firmware must be stored in secure memory. 130 * Append SEC Firmware to secure mmu table. 131 */ 132 if (!(gd->arch.secure_ram & MEM_RESERVE_SECURE_MAINTAINED)) { 133 ret = -ENXIO; 134 goto out; 135 } 136 137 sec_firmware_addr = (gd->arch.secure_ram & MEM_RESERVE_SECURE_ADDR_MASK) + 138 gd->arch.tlb_size; 139 #else 140 #error "The CONFIG_SYS_MEM_RESERVE_SECURE must be defined when enabled SEC Firmware support" 141 #endif 142 143 /* Align SEC Firmware base address to 4K */ 144 sec_firmware_addr = (sec_firmware_addr + 0xfff) & ~0xfff; 145 debug("SEC Firmware: Load address: 0x%llx\n", 146 sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK); 147 148 ret = sec_firmware_parse_image(sec_firmware_img, &raw_image_addr, 149 &raw_image_size); 150 if (ret) 151 goto out; 152 153 /* TODO: 154 * Check if the end addr of SEC Firmware has been extend the secure 155 * memory. 156 */ 157 158 /* Copy the secure firmware to secure memory */ 159 ret = sec_firmware_copy_image("SEC Firmware", (u64)raw_image_addr, 160 raw_image_size, sec_firmware_addr & 161 SEC_FIRMWARE_ADDR_MASK); 162 if (ret) 163 goto out; 164 165 sec_firmware_addr |= SEC_FIRMWARE_LOADED; 166 debug("SEC Firmware: Entry point: 0x%llx\n", 167 sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK); 168 169 return 0; 170 171 out: 172 printf("SEC Firmware: error (%d)\n", ret); 173 sec_firmware_addr = 0; 174 175 return ret; 176 } 177 178 static int sec_firmware_entry(u32 *eret_hold_l, u32 *eret_hold_h) 179 { 180 const void *entry = (void *)(sec_firmware_addr & 181 SEC_FIRMWARE_ADDR_MASK); 182 183 return _sec_firmware_entry(entry, eret_hold_l, eret_hold_h); 184 } 185 186 /* Check the secure firmware FIT image */ 187 __weak bool sec_firmware_is_valid(const void *sec_firmware_img) 188 { 189 if (fdt_check_header(sec_firmware_img)) { 190 printf("SEC Firmware: Bad firmware image (not a FIT image)\n"); 191 return false; 192 } 193 194 if (!fit_check_format(sec_firmware_img)) { 195 printf("SEC Firmware: Bad firmware image (bad FIT header)\n"); 196 return false; 197 } 198 199 return true; 200 } 201 202 #ifdef CONFIG_ARMV8_PSCI 203 /* 204 * The PSCI_VERSION function is added from PSCI v0.2. When the PSCI 205 * v0.1 received this function, the NOT_SUPPORTED (0xffff_ffff) error 206 * number will be returned according to SMC Calling Conventions. But 207 * when getting the NOT_SUPPORTED error number, we cannot ensure if 208 * the PSCI version is v0.1 or other error occurred. So, PSCI v0.1 209 * won't be supported by this framework. 210 * And if the secure firmware isn't running, return NOT_SUPPORTED. 211 * 212 * The return value on success is PSCI version in format 213 * major[31:16]:minor[15:0]. 214 */ 215 unsigned int sec_firmware_support_psci_version(void) 216 { 217 if (sec_firmware_addr & SEC_FIRMWARE_RUNNING) 218 return _sec_firmware_support_psci_version(); 219 220 return 0xffffffff; 221 } 222 #endif 223 224 /* 225 * sec_firmware_init - Initialize the SEC Firmware 226 * @sec_firmware_img: the SEC Firmware image address 227 * @eret_hold_l: the address to hold exception return address low 228 * @eret_hold_h: the address to hold exception return address high 229 */ 230 int sec_firmware_init(const void *sec_firmware_img, 231 u32 *eret_hold_l, 232 u32 *eret_hold_h) 233 { 234 int ret; 235 236 if (!sec_firmware_is_valid(sec_firmware_img)) 237 return -EINVAL; 238 239 ret = sec_firmware_load_image(sec_firmware_img); 240 if (ret) { 241 printf("SEC Firmware: Failed to load image\n"); 242 return ret; 243 } else if (sec_firmware_addr & SEC_FIRMWARE_LOADED) { 244 ret = sec_firmware_entry(eret_hold_l, eret_hold_h); 245 if (ret) { 246 printf("SEC Firmware: Failed to initialize\n"); 247 return ret; 248 } 249 } 250 251 debug("SEC Firmware: Return from SEC Firmware: current_el = %d\n", 252 current_el()); 253 254 /* 255 * The PE will be turned into target EL when returned from 256 * SEC Firmware. 257 */ 258 if (current_el() != SEC_FIRMWARE_TARGET_EL) 259 return -EACCES; 260 261 sec_firmware_addr |= SEC_FIRMWARE_RUNNING; 262 263 /* Set exception table and enable caches if it isn't EL3 */ 264 if (current_el() != 3) { 265 c_runtime_cpu_setup(); 266 enable_caches(); 267 } 268 269 return 0; 270 } 271