arch/arm/mach-k3/security.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * K3: Security functions
   4  *
   5  * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
   6  *      Andrew F. Davis <afd@ti.com>
   7  */
   8
   9 #include <common.h>
  10 #include <cpu_func.h>
  11 #include <dm.h>
  12 #include <hang.h>
  13 #include <image.h>
  14 #include <log.h>
  15 #include <asm/cache.h>
  16 #include <linux/soc/ti/ti_sci_protocol.h>
  17 #include <mach/spl.h>
  18 #include <spl.h>
  19 #include <asm/arch/sys_proto.h>
  20
  21 void ti_secure_image_post_process(void **p_image, size_t *p_size)
  22 {
  23         struct ti_sci_handle *ti_sci = get_ti_sci_handle();
  24         struct ti_sci_proc_ops *proc_ops = &ti_sci->ops.proc_ops;
  25         u64 image_addr;
  26         u32 image_size;
  27         int ret;
  28
  29         image_addr = (uintptr_t)*p_image;
  30         image_size = *p_size;
  31
  32         debug("Authenticating image at address 0x%016llx\n", image_addr);
  33         debug("Authenticating image of size %d bytes\n", image_size);
  34
  35         flush_dcache_range((unsigned long)image_addr,
  36                            ALIGN((unsigned long)image_addr + image_size,
  37                                  ARCH_DMA_MINALIGN));
  38
  39         /* Authenticate image */
  40         ret = proc_ops->proc_auth_boot_image(ti_sci, &image_addr, &image_size);
  41         if (ret) {
  42                 printf("Authentication failed!\n");
  43                 hang();
  44         }
  45
  46         if (image_size)
  47                 invalidate_dcache_range((unsigned long)image_addr,
  48                                         ALIGN((unsigned long)image_addr +
  49                                               image_size, ARCH_DMA_MINALIGN));
  50
  51         /*
  52          * The image_size returned may be 0 when the authentication process has
  53          * moved the image. When this happens no further processing on the
  54          * image is needed or often even possible as it may have also been
  55          * placed behind a firewall when moved.
  56          */
  57         *p_size = image_size;
  58
  59         /*
  60          * Output notification of successful authentication to re-assure the
  61          * user that the secure code is being processed as expected. However
  62          * suppress any such log output in case of building for SPL and booting
  63          * via YMODEM. This is done to avoid disturbing the YMODEM serial
  64          * protocol transactions.
  65          */
  66         if (!(IS_ENABLED(CONFIG_SPL_BUILD) &&
  67               IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) &&
  68               spl_boot_device() == BOOT_DEVICE_UART))
  69                 printf("Authentication passed\n");
  70 }