mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
9f67b56772
Signed-off-by: Thomas Hebb <tommyhebb@gmail.com>
498 lines
12 KiB
C
498 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2016 NXP Semiconductor, Inc.
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <errno.h>
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#include <linux/kernel.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/types.h>
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#include <asm/macro.h>
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#include <asm/armv8/sec_firmware.h>
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DECLARE_GLOBAL_DATA_PTR;
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extern void c_runtime_cpu_setup(void);
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#define SEC_FIRMWARE_LOADED 0x1
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#define SEC_FIRMWARE_RUNNING 0x2
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#define SEC_FIRMWARE_ADDR_MASK (~0x3)
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/*
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* Secure firmware load addr
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* Flags used: 0x1 secure firmware has been loaded to secure memory
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* 0x2 secure firmware is running
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*/
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phys_addr_t sec_firmware_addr;
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#ifndef SEC_FIRMWARE_FIT_IMAGE
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#define SEC_FIRMWARE_FIT_IMAGE "firmware"
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#endif
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#ifndef SEC_FIRMWARE_FIT_CNF_NAME
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#define SEC_FIRMWARE_FIT_CNF_NAME "config-1"
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#endif
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#ifndef SEC_FIRMWARE_TARGET_EL
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#define SEC_FIRMWARE_TARGET_EL 2
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#endif
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static int sec_firmware_get_data(const void *sec_firmware_img,
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const void **data, size_t *size)
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{
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int conf_node_off, fw_node_off;
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char *conf_node_name = NULL;
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char *desc;
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int ret;
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conf_node_name = SEC_FIRMWARE_FIT_CNF_NAME;
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conf_node_off = fit_conf_get_node(sec_firmware_img, conf_node_name);
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if (conf_node_off < 0) {
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printf("SEC Firmware: %s: no such config\n", conf_node_name);
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return -ENOENT;
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}
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fw_node_off = fit_conf_get_prop_node(sec_firmware_img, conf_node_off,
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SEC_FIRMWARE_FIT_IMAGE);
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if (fw_node_off < 0) {
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printf("SEC Firmware: No '%s' in config\n",
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SEC_FIRMWARE_FIT_IMAGE);
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return -ENOLINK;
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}
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/* Verify secure firmware image */
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if (!(fit_image_verify(sec_firmware_img, fw_node_off))) {
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printf("SEC Firmware: Bad firmware image (bad CRC)\n");
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return -EINVAL;
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}
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if (fit_image_get_data(sec_firmware_img, fw_node_off, data, size)) {
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printf("SEC Firmware: Can't get %s subimage data/size",
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SEC_FIRMWARE_FIT_IMAGE);
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return -ENOENT;
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}
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ret = fit_get_desc(sec_firmware_img, fw_node_off, &desc);
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if (ret)
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printf("SEC Firmware: Can't get description\n");
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else
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printf("%s\n", desc);
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return ret;
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}
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/*
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* SEC Firmware FIT image parser checks if the image is in FIT
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* format, verifies integrity of the image and calculates raw
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* image address and size values.
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*
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* Returns 0 on success and a negative errno on error task fail.
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*/
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static int sec_firmware_parse_image(const void *sec_firmware_img,
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const void **raw_image_addr,
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size_t *raw_image_size)
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{
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int ret;
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ret = sec_firmware_get_data(sec_firmware_img, raw_image_addr,
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raw_image_size);
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if (ret)
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return ret;
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debug("SEC Firmware: raw_image_addr = 0x%p, raw_image_size = 0x%lx\n",
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*raw_image_addr, *raw_image_size);
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return 0;
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}
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/*
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* SEC Firmware FIT image parser to check if any loadable is
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* present. If present, verify integrity of the loadable and
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* copy loadable to address provided in (loadable_h, loadable_l).
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*
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* Returns 0 on success and a negative errno on error task fail.
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*/
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static int sec_firmware_check_copy_loadable(const void *sec_firmware_img,
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u32 *loadable_l, u32 *loadable_h)
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{
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phys_addr_t sec_firmware_loadable_addr = 0;
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int conf_node_off, ld_node_off, images;
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char *conf_node_name = NULL;
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const void *data;
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size_t size;
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ulong load;
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const char *name, *str, *type;
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int len;
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conf_node_name = SEC_FIRMWARE_FIT_CNF_NAME;
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conf_node_off = fit_conf_get_node(sec_firmware_img, conf_node_name);
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if (conf_node_off < 0) {
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printf("SEC Firmware: %s: no such config\n", conf_node_name);
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return -ENOENT;
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}
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/* find the node holding the images information */
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images = fdt_path_offset(sec_firmware_img, FIT_IMAGES_PATH);
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if (images < 0) {
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printf("%s: Cannot find /images node: %d\n", __func__, images);
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return -1;
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}
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type = FIT_LOADABLE_PROP;
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name = fdt_getprop(sec_firmware_img, conf_node_off, type, &len);
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if (!name) {
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/* Loadables not present */
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return 0;
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}
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printf("SEC Firmware: '%s' present in config\n", type);
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for (str = name; str && ((str - name) < len);
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str = strchr(str, '\0') + 1) {
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printf("%s: '%s'\n", type, str);
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ld_node_off = fdt_subnode_offset(sec_firmware_img, images, str);
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if (ld_node_off < 0) {
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printf("cannot find image node '%s': %d\n", str,
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ld_node_off);
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return -EINVAL;
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}
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/* Verify secure firmware image */
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if (!(fit_image_verify(sec_firmware_img, ld_node_off))) {
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printf("SEC Loadable: Bad loadable image (bad CRC)\n");
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return -EINVAL;
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}
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if (fit_image_get_data(sec_firmware_img, ld_node_off,
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&data, &size)) {
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printf("SEC Loadable: Can't get subimage data/size");
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return -ENOENT;
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}
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/* Get load address, treated as load offset to secure memory */
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if (fit_image_get_load(sec_firmware_img, ld_node_off, &load)) {
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printf("SEC Loadable: Can't get subimage load");
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return -ENOENT;
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}
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/* Compute load address for loadable in secure memory */
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sec_firmware_loadable_addr = (sec_firmware_addr -
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gd->arch.tlb_size) + load;
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/* Copy loadable to secure memory and flush dcache */
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debug("%s copied to address 0x%p\n",
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FIT_LOADABLE_PROP, (void *)sec_firmware_loadable_addr);
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memcpy((void *)sec_firmware_loadable_addr, data, size);
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flush_dcache_range(sec_firmware_loadable_addr,
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sec_firmware_loadable_addr + size);
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/* Populate loadable address only for Trusted OS */
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if (!strcmp(str, "trustedOS@1")) {
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/*
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* Populate address ptrs for loadable image with
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* loadbale addr
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*/
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out_le32(loadable_l, (sec_firmware_loadable_addr &
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WORD_MASK));
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out_le32(loadable_h, (sec_firmware_loadable_addr >>
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WORD_SHIFT));
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}
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}
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return 0;
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}
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static int sec_firmware_copy_image(const char *title,
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u64 image_addr, u32 image_size, u64 sec_firmware)
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{
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debug("%s copied to address 0x%p\n", title, (void *)sec_firmware);
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memcpy((void *)sec_firmware, (void *)image_addr, image_size);
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flush_dcache_range(sec_firmware, sec_firmware + image_size);
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return 0;
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}
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/*
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* This function will parse the SEC Firmware image, and then load it
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* to secure memory. Also load any loadable if present along with SEC
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* Firmware image.
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*/
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static int sec_firmware_load_image(const void *sec_firmware_img,
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u32 *loadable_l, u32 *loadable_h)
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{
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const void *raw_image_addr;
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size_t raw_image_size = 0;
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int ret;
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/*
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* The Excetpion Level must be EL3 to load and initialize
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* the SEC Firmware.
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*/
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if (current_el() != 3) {
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ret = -EACCES;
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goto out;
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}
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#ifdef CONFIG_SYS_MEM_RESERVE_SECURE
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/*
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* The SEC Firmware must be stored in secure memory.
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* Append SEC Firmware to secure mmu table.
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*/
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if (!(gd->arch.secure_ram & MEM_RESERVE_SECURE_MAINTAINED)) {
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ret = -ENXIO;
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goto out;
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}
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sec_firmware_addr = (gd->arch.secure_ram & MEM_RESERVE_SECURE_ADDR_MASK) +
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gd->arch.tlb_size;
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#else
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#error "The CONFIG_SYS_MEM_RESERVE_SECURE must be defined when enabled SEC Firmware support"
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#endif
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/* Align SEC Firmware base address to 4K */
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sec_firmware_addr = (sec_firmware_addr + 0xfff) & ~0xfff;
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debug("SEC Firmware: Load address: 0x%llx\n",
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sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK);
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ret = sec_firmware_parse_image(sec_firmware_img, &raw_image_addr,
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&raw_image_size);
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if (ret)
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goto out;
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/* TODO:
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* Check if the end addr of SEC Firmware has been extend the secure
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* memory.
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*/
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/* Copy the secure firmware to secure memory */
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ret = sec_firmware_copy_image("SEC Firmware", (u64)raw_image_addr,
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raw_image_size, sec_firmware_addr &
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SEC_FIRMWARE_ADDR_MASK);
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if (ret)
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goto out;
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/*
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* Check if any loadable are present along with firmware image, if
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* present load them.
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*/
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ret = sec_firmware_check_copy_loadable(sec_firmware_img, loadable_l,
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loadable_h);
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if (ret)
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goto out;
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sec_firmware_addr |= SEC_FIRMWARE_LOADED;
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debug("SEC Firmware: Entry point: 0x%llx\n",
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sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK);
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return 0;
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out:
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printf("SEC Firmware: error (%d)\n", ret);
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sec_firmware_addr = 0;
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return ret;
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}
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static int sec_firmware_entry(u32 *eret_hold_l, u32 *eret_hold_h)
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{
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const void *entry = (void *)(sec_firmware_addr &
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SEC_FIRMWARE_ADDR_MASK);
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return _sec_firmware_entry(entry, eret_hold_l, eret_hold_h);
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}
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/* Check the secure firmware FIT image */
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__weak bool sec_firmware_is_valid(const void *sec_firmware_img)
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{
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if (fdt_check_header(sec_firmware_img)) {
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printf("SEC Firmware: Bad firmware image (not a FIT image)\n");
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return false;
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}
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if (!fit_check_format(sec_firmware_img)) {
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printf("SEC Firmware: Bad firmware image (bad FIT header)\n");
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return false;
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}
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return true;
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}
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#ifdef CONFIG_SEC_FIRMWARE_ARMV8_PSCI
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/*
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* The PSCI_VERSION function is added from PSCI v0.2. When the PSCI
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* v0.1 received this function, the NOT_SUPPORTED (0xffff_ffff) error
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* number will be returned according to SMC Calling Conventions. But
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* when getting the NOT_SUPPORTED error number, we cannot ensure if
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* the PSCI version is v0.1 or other error occurred. So, PSCI v0.1
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* won't be supported by this framework.
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* And if the secure firmware isn't running, return NOT_SUPPORTED.
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*
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* The return value on success is PSCI version in format
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* major[31:16]:minor[15:0].
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*/
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unsigned int sec_firmware_support_psci_version(void)
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{
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if (current_el() == SEC_FIRMWARE_TARGET_EL)
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return _sec_firmware_support_psci_version();
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return PSCI_INVALID_VER;
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}
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#endif
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/*
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* Check with sec_firmware if it supports random number generation
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* via HW RNG
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*
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* The return value will be true if it is supported
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*/
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bool sec_firmware_support_hwrng(void)
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{
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#ifdef CONFIG_TFABOOT
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/* return true as TFA has one job ring reserved */
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return true;
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#endif
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if (sec_firmware_addr & SEC_FIRMWARE_RUNNING) {
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return true;
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}
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return false;
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}
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/*
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* sec_firmware_get_random - Get a random number from SEC Firmware
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* @rand: random number buffer to be filled
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* @bytes: Number of bytes of random number to be supported
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* @eret: -1 in case of error, 0 for success
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*/
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int sec_firmware_get_random(uint8_t *rand, int bytes)
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{
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unsigned long long num;
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struct pt_regs regs;
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int param1;
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if (!bytes || bytes > 8) {
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printf("Max Random bytes genration supported is 8\n");
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return -1;
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}
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#define SIP_RNG_64 0xC200FF11
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regs.regs[0] = SIP_RNG_64;
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if (bytes <= 4)
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param1 = 0;
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else
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param1 = 1;
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regs.regs[1] = param1;
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smc_call(®s);
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if (regs.regs[0])
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return -1;
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num = regs.regs[1];
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memcpy(rand, &num, bytes);
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return 0;
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}
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/*
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* sec_firmware_init - Initialize the SEC Firmware
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* @sec_firmware_img: the SEC Firmware image address
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* @eret_hold_l: the address to hold exception return address low
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* @eret_hold_h: the address to hold exception return address high
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* @loadable_l: the address to hold loadable address low
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* @loadable_h: the address to hold loadable address high
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*/
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int sec_firmware_init(const void *sec_firmware_img,
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u32 *eret_hold_l,
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u32 *eret_hold_h,
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u32 *loadable_l,
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u32 *loadable_h)
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{
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int ret;
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if (!sec_firmware_is_valid(sec_firmware_img))
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return -EINVAL;
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ret = sec_firmware_load_image(sec_firmware_img, loadable_l,
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loadable_h);
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if (ret) {
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printf("SEC Firmware: Failed to load image\n");
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return ret;
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} else if (sec_firmware_addr & SEC_FIRMWARE_LOADED) {
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ret = sec_firmware_entry(eret_hold_l, eret_hold_h);
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if (ret) {
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printf("SEC Firmware: Failed to initialize\n");
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return ret;
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}
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}
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debug("SEC Firmware: Return from SEC Firmware: current_el = %d\n",
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current_el());
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/*
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* The PE will be turned into target EL when returned from
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* SEC Firmware.
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*/
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if (current_el() != SEC_FIRMWARE_TARGET_EL)
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return -EACCES;
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sec_firmware_addr |= SEC_FIRMWARE_RUNNING;
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/* Set exception table and enable caches if it isn't EL3 */
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if (current_el() != 3) {
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c_runtime_cpu_setup();
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enable_caches();
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}
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return 0;
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}
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/*
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* fdt_fix_kaslr - Add kalsr-seed node in Device tree
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* @fdt: Device tree
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* @eret: 0 in case of error, 1 for success
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*/
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int fdt_fixup_kaslr(void *fdt)
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{
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int nodeoffset;
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int err, ret = 0;
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u8 rand[8];
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#if defined(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT)
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/* Check if random seed generation is supported */
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if (sec_firmware_support_hwrng() == false) {
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printf("WARNING: SEC firmware not running, no kaslr-seed\n");
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return 0;
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}
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ret = sec_firmware_get_random(rand, 8);
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if (ret < 0) {
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printf("WARNING: No random number to set kaslr-seed\n");
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return 0;
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}
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err = fdt_check_header(fdt);
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if (err < 0) {
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printf("fdt_chosen: %s\n", fdt_strerror(err));
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return 0;
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}
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/* find or create "/chosen" node. */
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nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
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if (nodeoffset < 0)
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return 0;
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err = fdt_setprop(fdt, nodeoffset, "kaslr-seed", rand,
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sizeof(rand));
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if (err < 0) {
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printf("WARNING: can't set kaslr-seed %s.\n",
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fdt_strerror(err));
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return 0;
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}
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ret = 1;
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#endif
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return ret;
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}
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