bl2u/bl2u_main.c

   1 /*
   2  * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
   3  *
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  */
   6
   7 #include <arch.h>
   8 #include <arch_helpers.h>
   9 #include <assert.h>
  10 #include <auth_mod.h>
  11 #include <bl_common.h>
  12 #include <bl1.h>
  13 #include <console.h>
  14 #include <debug.h>
  15 #include <platform.h>
  16 #include <platform_def.h>
  17 #include <stdint.h>
  18
  19 /*******************************************************************************
  20  * This function is responsible to:
  21  * Load SCP_BL2U if platform has defined SCP_BL2U_BASE
  22  * Perform platform setup.
  23  * Go back to EL3.
  24  ******************************************************************************/
  25 void bl2u_main(void)
  26 {
  27         NOTICE("BL2U: %s\n", version_string);
  28         NOTICE("BL2U: %s\n", build_message);
  29
  30 #if SCP_BL2U_BASE
  31         int rc;
  32         /* Load the subsequent bootloader images */
  33         rc = bl2u_plat_handle_scp_bl2u();
  34         if (rc) {
  35                 ERROR("Failed to load SCP_BL2U (%i)\n", rc);
  36                 panic();
  37         }
  38 #endif
  39
  40         /* Perform platform setup in BL2U after loading SCP_BL2U */
  41         bl2u_platform_setup();
  42
  43         console_flush();
  44
  45 #ifdef AARCH32
  46         /*
  47          * For AArch32 state BL1 and BL2U share the MMU setup.
  48          * Given that BL2U does not map BL1 regions, MMU needs
  49          * to be disabled in order to go back to BL1.
  50          */
  51         disable_mmu_icache_secure();
  52 #endif /* AARCH32 */
  53
  54         /*
  55          * Indicate that BL2U is done and resume back to
  56          * normal world via an SMC to BL1.
  57          * x1 could be passed to Normal world,
  58          * so DO NOT pass any secret information.
  59          */
  60         smc(FWU_SMC_SEC_IMAGE_DONE, 0, 0, 0, 0, 0, 0, 0);
  61         wfi();
  62 }