bl2u/bl2u_main.c

   1 /*
   2  * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
   3  *
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  */
   6
   7 #include <assert.h>
   8 #include <stdint.h>
   9
  10 #include <platform_def.h>
  11
  12 #include <arch.h>
  13 #include <arch_helpers.h>
  14 #include <bl1/bl1.h>
  15 #include <bl2u/bl2u.h>
  16 #include <common/bl_common.h>
  17 #include <common/debug.h>
  18 #include <drivers/auth/auth_mod.h>
  19 #include <drivers/console.h>
  20 #include <plat/common/platform.h>
  21
  22 /*******************************************************************************
  23  * This function is responsible to:
  24  * Load SCP_BL2U if platform has defined SCP_BL2U_BASE
  25  * Perform platform setup.
  26  * Go back to EL3.
  27  ******************************************************************************/
  28 void bl2u_main(void)
  29 {
  30         NOTICE("BL2U: %s\n", version_string);
  31         NOTICE("BL2U: %s\n", build_message);
  32
  33 #if SCP_BL2U_BASE
  34         int rc;
  35         /* Load the subsequent bootloader images */
  36         rc = bl2u_plat_handle_scp_bl2u();
  37         if (rc) {
  38                 ERROR("Failed to load SCP_BL2U (%i)\n", rc);
  39                 panic();
  40         }
  41 #endif
  42
  43         /* Perform platform setup in BL2U after loading SCP_BL2U */
  44         bl2u_platform_setup();
  45
  46         console_flush();
  47
  48 #ifdef AARCH32
  49         /*
  50          * For AArch32 state BL1 and BL2U share the MMU setup.
  51          * Given that BL2U does not map BL1 regions, MMU needs
  52          * to be disabled in order to go back to BL1.
  53          */
  54         disable_mmu_icache_secure();
  55 #endif /* AARCH32 */
  56
  57         /*
  58          * Indicate that BL2U is done and resume back to
  59          * normal world via an SMC to BL1.
  60          * x1 could be passed to Normal world,
  61          * so DO NOT pass any secret information.
  62          */
  63         smc(FWU_SMC_SEC_IMAGE_DONE, 0, 0, 0, 0, 0, 0, 0);
  64         wfi();
  65 }