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