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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright 2016 NXP Semiconductor, Inc.
- */
- #include <common.h>
- #include <cpu_func.h>
- #include <errno.h>
- #include <fdt_support.h>
- #include <image.h>
- #include <asm/cache.h>
- #include <linux/kernel.h>
- #include <asm/io.h>
- #include <asm/system.h>
- #include <asm/types.h>
- #include <asm/macro.h>
- #include <asm/armv8/sec_firmware.h>
- DECLARE_GLOBAL_DATA_PTR;
- extern void c_runtime_cpu_setup(void);
- #define SEC_FIRMWARE_LOADED 0x1
- #define SEC_FIRMWARE_RUNNING 0x2
- #define SEC_FIRMWARE_ADDR_MASK (~0x3)
- /*
- * Secure firmware load addr
- * Flags used: 0x1 secure firmware has been loaded to secure memory
- * 0x2 secure firmware is running
- */
- phys_addr_t sec_firmware_addr;
- #ifndef SEC_FIRMWARE_FIT_IMAGE
- #define SEC_FIRMWARE_FIT_IMAGE "firmware"
- #endif
- #ifndef SEC_FIRMWARE_FIT_CNF_NAME
- #define SEC_FIRMWARE_FIT_CNF_NAME "config-1"
- #endif
- #ifndef SEC_FIRMWARE_TARGET_EL
- #define SEC_FIRMWARE_TARGET_EL 2
- #endif
- static int sec_firmware_get_data(const void *sec_firmware_img,
- const void **data, size_t *size)
- {
- int conf_node_off, fw_node_off;
- char *conf_node_name = NULL;
- char *desc;
- int ret;
- conf_node_name = SEC_FIRMWARE_FIT_CNF_NAME;
- conf_node_off = fit_conf_get_node(sec_firmware_img, conf_node_name);
- if (conf_node_off < 0) {
- printf("SEC Firmware: %s: no such config\n", conf_node_name);
- return -ENOENT;
- }
- fw_node_off = fit_conf_get_prop_node(sec_firmware_img, conf_node_off,
- SEC_FIRMWARE_FIT_IMAGE);
- if (fw_node_off < 0) {
- printf("SEC Firmware: No '%s' in config\n",
- SEC_FIRMWARE_FIT_IMAGE);
- return -ENOLINK;
- }
- /* Verify secure firmware image */
- if (!(fit_image_verify(sec_firmware_img, fw_node_off))) {
- printf("SEC Firmware: Bad firmware image (bad CRC)\n");
- return -EINVAL;
- }
- if (fit_image_get_data(sec_firmware_img, fw_node_off, data, size)) {
- printf("SEC Firmware: Can't get %s subimage data/size",
- SEC_FIRMWARE_FIT_IMAGE);
- return -ENOENT;
- }
- ret = fit_get_desc(sec_firmware_img, fw_node_off, &desc);
- if (ret)
- printf("SEC Firmware: Can't get description\n");
- else
- printf("%s\n", desc);
- return ret;
- }
- /*
- * SEC Firmware FIT image parser checks if the image is in FIT
- * format, verifies integrity of the image and calculates raw
- * image address and size values.
- *
- * Returns 0 on success and a negative errno on error task fail.
- */
- static int sec_firmware_parse_image(const void *sec_firmware_img,
- const void **raw_image_addr,
- size_t *raw_image_size)
- {
- int ret;
- ret = sec_firmware_get_data(sec_firmware_img, raw_image_addr,
- raw_image_size);
- if (ret)
- return ret;
- debug("SEC Firmware: raw_image_addr = 0x%p, raw_image_size = 0x%lx\n",
- *raw_image_addr, *raw_image_size);
- return 0;
- }
- /*
- * SEC Firmware FIT image parser to check if any loadable is
- * present. If present, verify integrity of the loadable and
- * copy loadable to address provided in (loadable_h, loadable_l).
- *
- * Returns 0 on success and a negative errno on error task fail.
- */
- static int sec_firmware_check_copy_loadable(const void *sec_firmware_img,
- u32 *loadable_l, u32 *loadable_h)
- {
- phys_addr_t sec_firmware_loadable_addr = 0;
- int conf_node_off, ld_node_off, images;
- char *conf_node_name = NULL;
- const void *data;
- size_t size;
- ulong load;
- const char *name, *str, *type;
- int len;
- conf_node_name = SEC_FIRMWARE_FIT_CNF_NAME;
- conf_node_off = fit_conf_get_node(sec_firmware_img, conf_node_name);
- if (conf_node_off < 0) {
- printf("SEC Firmware: %s: no such config\n", conf_node_name);
- return -ENOENT;
- }
- /* find the node holding the images information */
- images = fdt_path_offset(sec_firmware_img, FIT_IMAGES_PATH);
- if (images < 0) {
- printf("%s: Cannot find /images node: %d\n", __func__, images);
- return -1;
- }
- type = FIT_LOADABLE_PROP;
- name = fdt_getprop(sec_firmware_img, conf_node_off, type, &len);
- if (!name) {
- /* Loadables not present */
- return 0;
- }
- printf("SEC Firmware: '%s' present in config\n", type);
- for (str = name; str && ((str - name) < len);
- str = strchr(str, '\0') + 1) {
- printf("%s: '%s'\n", type, str);
- ld_node_off = fdt_subnode_offset(sec_firmware_img, images, str);
- if (ld_node_off < 0) {
- printf("cannot find image node '%s': %d\n", str,
- ld_node_off);
- return -EINVAL;
- }
- /* Verify secure firmware image */
- if (!(fit_image_verify(sec_firmware_img, ld_node_off))) {
- printf("SEC Loadable: Bad loadable image (bad CRC)\n");
- return -EINVAL;
- }
- if (fit_image_get_data(sec_firmware_img, ld_node_off,
- &data, &size)) {
- printf("SEC Loadable: Can't get subimage data/size");
- return -ENOENT;
- }
- /* Get load address, treated as load offset to secure memory */
- if (fit_image_get_load(sec_firmware_img, ld_node_off, &load)) {
- printf("SEC Loadable: Can't get subimage load");
- return -ENOENT;
- }
- /* Compute load address for loadable in secure memory */
- sec_firmware_loadable_addr = (sec_firmware_addr -
- gd->arch.tlb_size) + load;
- /* Copy loadable to secure memory and flush dcache */
- debug("%s copied to address 0x%p\n",
- FIT_LOADABLE_PROP, (void *)sec_firmware_loadable_addr);
- memcpy((void *)sec_firmware_loadable_addr, data, size);
- flush_dcache_range(sec_firmware_loadable_addr,
- sec_firmware_loadable_addr + size);
- /* Populate loadable address only for Trusted OS */
- if (!strcmp(str, "trustedOS@1")) {
- /*
- * Populate address ptrs for loadable image with
- * loadbale addr
- */
- out_le32(loadable_l, (sec_firmware_loadable_addr &
- WORD_MASK));
- out_le32(loadable_h, (sec_firmware_loadable_addr >>
- WORD_SHIFT));
- }
- }
- return 0;
- }
- static int sec_firmware_copy_image(const char *title,
- u64 image_addr, u32 image_size, u64 sec_firmware)
- {
- debug("%s copied to address 0x%p\n", title, (void *)sec_firmware);
- memcpy((void *)sec_firmware, (void *)image_addr, image_size);
- flush_dcache_range(sec_firmware, sec_firmware + image_size);
- return 0;
- }
- /*
- * This function will parse the SEC Firmware image, and then load it
- * to secure memory. Also load any loadable if present along with SEC
- * Firmware image.
- */
- static int sec_firmware_load_image(const void *sec_firmware_img,
- u32 *loadable_l, u32 *loadable_h)
- {
- const void *raw_image_addr;
- size_t raw_image_size = 0;
- int ret;
- /*
- * The Excetpion Level must be EL3 to load and initialize
- * the SEC Firmware.
- */
- if (current_el() != 3) {
- ret = -EACCES;
- goto out;
- }
- #ifdef CONFIG_SYS_MEM_RESERVE_SECURE
- /*
- * The SEC Firmware must be stored in secure memory.
- * Append SEC Firmware to secure mmu table.
- */
- if (!(gd->arch.secure_ram & MEM_RESERVE_SECURE_MAINTAINED)) {
- ret = -ENXIO;
- goto out;
- }
- sec_firmware_addr = (gd->arch.secure_ram & MEM_RESERVE_SECURE_ADDR_MASK) +
- gd->arch.tlb_size;
- #else
- #error "The CONFIG_SYS_MEM_RESERVE_SECURE must be defined when enabled SEC Firmware support"
- #endif
- /* Align SEC Firmware base address to 4K */
- sec_firmware_addr = (sec_firmware_addr + 0xfff) & ~0xfff;
- debug("SEC Firmware: Load address: 0x%llx\n",
- sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK);
- ret = sec_firmware_parse_image(sec_firmware_img, &raw_image_addr,
- &raw_image_size);
- if (ret)
- goto out;
- /* TODO:
- * Check if the end addr of SEC Firmware has been extend the secure
- * memory.
- */
- /* Copy the secure firmware to secure memory */
- ret = sec_firmware_copy_image("SEC Firmware", (u64)raw_image_addr,
- raw_image_size, sec_firmware_addr &
- SEC_FIRMWARE_ADDR_MASK);
- if (ret)
- goto out;
- /*
- * Check if any loadable are present along with firmware image, if
- * present load them.
- */
- ret = sec_firmware_check_copy_loadable(sec_firmware_img, loadable_l,
- loadable_h);
- if (ret)
- goto out;
- sec_firmware_addr |= SEC_FIRMWARE_LOADED;
- debug("SEC Firmware: Entry point: 0x%llx\n",
- sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK);
- return 0;
- out:
- printf("SEC Firmware: error (%d)\n", ret);
- sec_firmware_addr = 0;
- return ret;
- }
- static int sec_firmware_entry(u32 *eret_hold_l, u32 *eret_hold_h)
- {
- const void *entry = (void *)(sec_firmware_addr &
- SEC_FIRMWARE_ADDR_MASK);
- return _sec_firmware_entry(entry, eret_hold_l, eret_hold_h);
- }
- /* Check the secure firmware FIT image */
- __weak bool sec_firmware_is_valid(const void *sec_firmware_img)
- {
- if (fdt_check_header(sec_firmware_img)) {
- printf("SEC Firmware: Bad firmware image (not a FIT image)\n");
- return false;
- }
- if (!fit_check_format(sec_firmware_img)) {
- printf("SEC Firmware: Bad firmware image (bad FIT header)\n");
- return false;
- }
- return true;
- }
- #ifdef CONFIG_SEC_FIRMWARE_ARMV8_PSCI
- /*
- * The PSCI_VERSION function is added from PSCI v0.2. When the PSCI
- * v0.1 received this function, the NOT_SUPPORTED (0xffff_ffff) error
- * number will be returned according to SMC Calling Conventions. But
- * when getting the NOT_SUPPORTED error number, we cannot ensure if
- * the PSCI version is v0.1 or other error occurred. So, PSCI v0.1
- * won't be supported by this framework.
- * And if the secure firmware isn't running, return NOT_SUPPORTED.
- *
- * The return value on success is PSCI version in format
- * major[31:16]:minor[15:0].
- */
- unsigned int sec_firmware_support_psci_version(void)
- {
- if (current_el() == SEC_FIRMWARE_TARGET_EL)
- return _sec_firmware_support_psci_version();
- return PSCI_INVALID_VER;
- }
- #endif
- /*
- * Check with sec_firmware if it supports random number generation
- * via HW RNG
- *
- * The return value will be true if it is supported
- */
- bool sec_firmware_support_hwrng(void)
- {
- #ifdef CONFIG_TFABOOT
- /* return true as TFA has one job ring reserved */
- return true;
- #endif
- if (sec_firmware_addr & SEC_FIRMWARE_RUNNING) {
- return true;
- }
- return false;
- }
- /*
- * sec_firmware_get_random - Get a random number from SEC Firmware
- * @rand: random number buffer to be filled
- * @bytes: Number of bytes of random number to be supported
- * @eret: -1 in case of error, 0 for success
- */
- int sec_firmware_get_random(uint8_t *rand, int bytes)
- {
- unsigned long long num;
- struct pt_regs regs;
- int param1;
- if (!bytes || bytes > 8) {
- printf("Max Random bytes genration supported is 8\n");
- return -1;
- }
- #define SIP_RNG_64 0xC200FF11
- regs.regs[0] = SIP_RNG_64;
- if (bytes <= 4)
- param1 = 0;
- else
- param1 = 1;
- regs.regs[1] = param1;
- smc_call(®s);
- if (regs.regs[0])
- return -1;
- num = regs.regs[1];
- memcpy(rand, &num, bytes);
- return 0;
- }
- /*
- * sec_firmware_init - Initialize the SEC Firmware
- * @sec_firmware_img: the SEC Firmware image address
- * @eret_hold_l: the address to hold exception return address low
- * @eret_hold_h: the address to hold exception return address high
- * @loadable_l: the address to hold loadable address low
- * @loadable_h: the address to hold loadable address high
- */
- int sec_firmware_init(const void *sec_firmware_img,
- u32 *eret_hold_l,
- u32 *eret_hold_h,
- u32 *loadable_l,
- u32 *loadable_h)
- {
- int ret;
- if (!sec_firmware_is_valid(sec_firmware_img))
- return -EINVAL;
- ret = sec_firmware_load_image(sec_firmware_img, loadable_l,
- loadable_h);
- if (ret) {
- printf("SEC Firmware: Failed to load image\n");
- return ret;
- } else if (sec_firmware_addr & SEC_FIRMWARE_LOADED) {
- ret = sec_firmware_entry(eret_hold_l, eret_hold_h);
- if (ret) {
- printf("SEC Firmware: Failed to initialize\n");
- return ret;
- }
- }
- debug("SEC Firmware: Return from SEC Firmware: current_el = %d\n",
- current_el());
- /*
- * The PE will be turned into target EL when returned from
- * SEC Firmware.
- */
- if (current_el() != SEC_FIRMWARE_TARGET_EL)
- return -EACCES;
- sec_firmware_addr |= SEC_FIRMWARE_RUNNING;
- /* Set exception table and enable caches if it isn't EL3 */
- if (current_el() != 3) {
- c_runtime_cpu_setup();
- enable_caches();
- }
- return 0;
- }
- /*
- * fdt_fix_kaslr - Add kalsr-seed node in Device tree
- * @fdt: Device tree
- * @eret: 0 in case of error, 1 for success
- */
- int fdt_fixup_kaslr(void *fdt)
- {
- int nodeoffset;
- int err, ret = 0;
- u8 rand[8];
- #if defined(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT)
- /* Check if random seed generation is supported */
- if (sec_firmware_support_hwrng() == false) {
- printf("WARNING: SEC firmware not running, no kaslr-seed\n");
- return 0;
- }
- ret = sec_firmware_get_random(rand, 8);
- if (ret < 0) {
- printf("WARNING: No random number to set kaslr-seed\n");
- return 0;
- }
- err = fdt_check_header(fdt);
- if (err < 0) {
- printf("fdt_chosen: %s\n", fdt_strerror(err));
- return 0;
- }
- /* find or create "/chosen" node. */
- nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
- if (nodeoffset < 0)
- return 0;
- err = fdt_setprop(fdt, nodeoffset, "kaslr-seed", rand,
- sizeof(rand));
- if (err < 0) {
- printf("WARNING: can't set kaslr-seed %s.\n",
- fdt_strerror(err));
- return 0;
- }
- ret = 1;
- #endif
- return ret;
- }
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