LXR uboot/arch/arm/cpu/armv8/sec

   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
  16DECLARE_GLOBAL_DATA_PTR;
  17extern 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
  29static 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 */
  81static 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
  98static 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 */
 112static 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
 171out:
 172        printf("SEC Firmware: error (%d)\n", ret);
 173        sec_firmware_addr = 0;
 174
 175        return ret;
 176}
 177
 178static 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 */
 215unsigned 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 */
 230int 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