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