src/arch/arm/stages.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright 2012 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.
  18  */
  19
  20 /*
  21  * This file contains entry/exit functions for each stage during coreboot
  22  * execution (bootblock entry and ramstage exit will depend on external
  23  * loading).
  24  *
  25  * Entry points should be set in the linker script and honored by CBFS,
  26  * so text section layout shouldn't matter. Still, it doesn't hurt to put
  27  * stage_entry first (which XXXstage.ld will do automatically through the
  28  * .text.stage_entry section created by -ffunction-sections).
  29  */
  30
  31 #include <arch/stages.h>
  32 #include <arch/cache.h>
  33
  34 /**
  35  * generic stage entry point. override this if board specific code is needed.
  36  */
  37 __attribute__((weak)) void stage_entry(void)
  38 {
  39         main();
  40 }
  41
  42 /* we had marked 'doit' as 'noreturn'.
  43  * There is no apparent harm in leaving it as something we can return from, and in the one
  44  * case where we call a payload, the payload is allowed to return.
  45  * Hence, leave it as something we can return from.
  46  */
  47 void stage_exit(void *addr)
  48 {
  49         void (*doit)(void) = addr;
  50         /*
  51          * Most stages load code so we need to sync caches here. Should maybe
  52          * go into cbfs_load_stage() instead...
  53          */
  54         cache_sync_instructions();
  55         doit();
  56 }