Documentation/mainboard_io_trap_handler_sample.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2008-2009 coresystems GmbH
   5  * Copyright 2013 Google Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <arch/io.h>
  18 #include <console/console.h>
  19 #include <cpu/x86/smm.h>
  20 #include <soc/pm.h>
  21 #include <soc/smm.h>
  22 #include <elog.h>
  23 #include <ec/google/chromeec/ec.h>
  24 #include <soc/gpio.h>
  25 #include <soc/iomap.h>
  26 #include <soc/nvs.h>
  27 #include <soc/pm.h>
  28 #include <soc/smm.h>
  29 #include "ec.h"
  30 #include "gpio.h"
  31
  32 int mainboard_io_trap_handler(int smif)
  33 {
  34        switch (smif) {
  35        case 0x99:
  36                printk(BIOS_DEBUG, "Sample\n");
  37                smm_get_gnvs()->smif = 0;
  38                break;
  39        default:
  40                return 0;
  41        }
  42
  43        /* On success, the IO Trap Handler returns 0
  44         * On failure, the IO Trap Handler returns a value != 0
  45         *
  46         * For now, we force the return value to 0 and log all traps to
  47         * see what's going on.
  48         */
  49        //smm_get_gnvs()->smif = 0;
  50        return 1;
  51 }