src/arch/arm64/boot.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright 2013 Google Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include <arch/cache.h>
  21 #include <arch/lib_helpers.h>
  22 #include <arch/secmon.h>
  23 #include <arch/stages.h>
  24 #include <arch/spintable.h>
  25 #include <arch/transition.h>
  26 #include <cbmem.h>
  27 #include <console/console.h>
  28 #include <program_loading.h>
  29 #include <string.h>
  30
  31 void arch_payload_run(const struct payload *payload)
  32 {
  33         void (*payload_entry)(void *) = payload->entry;
  34
  35         void *cb_tables = cbmem_find(CBMEM_ID_CBTABLE);
  36         uint8_t current_el = get_current_el();
  37
  38         printk(BIOS_SPEW, "entry    = %p\n", payload->entry);
  39
  40         secmon_run(payload_entry, cb_tables);
  41
  42         /* Start the other CPUs spinning. */
  43         spintable_start();
  44
  45         /* If current EL is not EL3, jump to payload at same EL. */
  46         if (current_el != EL3) {
  47                 cache_sync_instructions();
  48                 /* Point of no-return */
  49                 payload_entry(cb_tables);
  50         }
  51
  52         /* If current EL is EL3, we transition to payload in EL2. */
  53         struct exc_state exc_state;
  54
  55         memset(&exc_state, 0, sizeof(exc_state));
  56
  57         exc_state.elx.spsr = get_eret_el(EL2, SPSR_USE_L);
  58
  59         cache_sync_instructions();
  60         transition_with_entry(payload->entry, cb_tables, &exc_state);
  61 }