bl1/aarch64/bl1_entrypoint.S

   1 /*
   2  * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
   3  *
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  */
   6
   7 #include <arch.h>
   8 #include <el3_common_macros.S>
   9
  10         .globl  bl1_entrypoint
  11
  12
  13         /* -----------------------------------------------------
  14          * bl1_entrypoint() is the entry point into the trusted
  15          * firmware code when a cpu is released from warm or
  16          * cold reset.
  17          * -----------------------------------------------------
  18          */
  19
  20 func bl1_entrypoint
  21         /* ---------------------------------------------------------------------
  22          * If the reset address is programmable then bl1_entrypoint() is
  23          * executed only on the cold boot path. Therefore, we can skip the warm
  24          * boot mailbox mechanism.
  25          * ---------------------------------------------------------------------
  26          */
  27         el3_entrypoint_common                                   \
  28                 _init_sctlr=1                                   \
  29                 _warm_boot_mailbox=!PROGRAMMABLE_RESET_ADDRESS  \
  30                 _secondary_cold_boot=!COLD_BOOT_SINGLE_CPU      \
  31                 _init_memory=1                                  \
  32                 _init_c_runtime=1                               \
  33                 _exception_vectors=bl1_exceptions
  34
  35         /* --------------------------------------------------------------------
  36          * Perform BL1 setup
  37          * --------------------------------------------------------------------
  38          */
  39         bl      bl1_setup
  40
  41         /* --------------------------------------------------------------------
  42          * Enable pointer authentication
  43          * --------------------------------------------------------------------
  44          */
  45 #if ENABLE_PAUTH
  46         mrs     x0, sctlr_el3
  47         orr     x0, x0, #SCTLR_EnIA_BIT
  48         msr     sctlr_el3, x0
  49         isb
  50 #endif /* ENABLE_PAUTH */
  51
  52         /* --------------------------------------------------------------------
  53          * Initialize platform and jump to our c-entry point
  54          * for this type of reset.
  55          * --------------------------------------------------------------------
  56          */
  57         bl      bl1_main
  58
  59         /* --------------------------------------------------------------------
  60          * Disable pointer authentication before jumping to BL31 or that will
  61          * cause an authentication failure during the early platform init.
  62          * --------------------------------------------------------------------
  63          */
  64 #if ENABLE_PAUTH
  65         mrs     x0, sctlr_el3
  66         bic     x0, x0, #SCTLR_EnIA_BIT
  67         msr     sctlr_el3, x0
  68         isb
  69 #endif /* ENABLE_PAUTH */
  70
  71         /* --------------------------------------------------
  72          * Do the transition to next boot image.
  73          * --------------------------------------------------
  74          */
  75         b       el3_exit
  76 endfunc bl1_entrypoint