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 /*******************************************************************************
  22  * This function is responsible to:
  23  * Load SCP_BL2U if platform has defined SCP_BL2U_BASE
  24  * Perform platform setup.
  25  * Go back to EL3.
  26  ******************************************************************************/
  27 void bl2u_main(void)
  28 {
  29         NOTICE("BL2U: %s\n", version_string);
  30         NOTICE("BL2U: %s\n", build_message);
  31
  32 #if SCP_BL2U_BASE
  33         int rc;
  34         /* Load the subsequent bootloader images */
  35         rc = bl2u_plat_handle_scp_bl2u();
  36         if (rc) {
  37                 ERROR("Failed to load SCP_BL2U (%i)\n", rc);
  38                 panic();
  39         }
  40 #endif
  41
  42         /* Perform platform setup in BL2U after loading SCP_BL2U */
  43         bl2u_platform_setup();
  44
  45         console_flush();
  46
  47 #ifdef AARCH32
  48         /*
  49          * For AArch32 state BL1 and BL2U share the MMU setup.
  50          * Given that BL2U does not map BL1 regions, MMU needs
  51          * to be disabled in order to go back to BL1.
  52          */
  53         disable_mmu_icache_secure();
  54 #endif /* AARCH32 */
  55
  56         /*
  57          * Indicate that BL2U is done and resume back to
  58          * normal world via an SMC to BL1.
  59          * x1 could be passed to Normal world,
  60          * so DO NOT pass any secret information.
  61          */
  62         smc(FWU_SMC_SEC_IMAGE_DONE, 0, 0, 0, 0, 0, 0, 0);
  63         wfi();
  64 }