src/soc/intel/baytrail/refcode.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 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
  16 #include <string.h>
  17 #include <arch/acpi.h>
  18 #include <cbmem.h>
  19 #include <console/console.h>
  20 #include <console/streams.h>
  21 #include <cpu/x86/tsc.h>
  22 #include <program_loading.h>
  23 #include <rmodule.h>
  24 #include <stage_cache.h>
  25
  26 #include <soc/ramstage.h>
  27 #include <soc/efi_wrapper.h>
  28
  29 static void ABI_X86 send_to_console(unsigned char b)
  30 {
  31         console_tx_byte(b);
  32 }
  33
  34 static efi_wrapper_entry_t load_refcode_from_cache(void)
  35 {
  36         struct prog refcode;
  37
  38         printk(BIOS_DEBUG, "refcode loading from cache.\n");
  39
  40         stage_cache_load_stage(STAGE_REFCODE, &refcode);
  41
  42         return (efi_wrapper_entry_t)prog_entry(&refcode);
  43 }
  44
  45 static efi_wrapper_entry_t load_reference_code(void)
  46 {
  47         struct prog prog =
  48                 PROG_INIT(ASSET_REFCODE, CONFIG_CBFS_PREFIX "/refcode");
  49         struct rmod_stage_load refcode = {
  50                 .cbmem_id = CBMEM_ID_REFCODE,
  51                 .prog = &prog,
  52         };
  53
  54         if (acpi_is_wakeup_s3()) {
  55                 return load_refcode_from_cache();
  56         }
  57
  58         if (prog_locate(&prog)) {
  59                 printk(BIOS_DEBUG, "Couldn't locate reference code.\n");
  60                 return NULL;
  61         }
  62
  63         if (rmodule_stage_load(&refcode)) {
  64                 printk(BIOS_DEBUG, "Error loading reference code.\n");
  65                 return NULL;
  66         }
  67
  68         /* Cache loaded reference code. */
  69         stage_cache_add(STAGE_REFCODE, &prog);
  70
  71         return prog_entry(&prog);
  72 }
  73
  74 void baytrail_run_reference_code(void)
  75 {
  76         int ret;
  77         efi_wrapper_entry_t entry;
  78         struct efi_wrapper_params wrp = {
  79                 .version = EFI_WRAPPER_VER,
  80                 .console_out = send_to_console,
  81         };
  82
  83         entry = load_reference_code();
  84
  85         if (entry == NULL)
  86                 return;
  87
  88         wrp.tsc_ticks_per_microsecond = tsc_freq_mhz();
  89
  90         /* Call into reference code. */
  91         ret = entry(&wrp);
  92
  93         if (ret != 0) {
  94                 printk(BIOS_DEBUG, "Reference code returned %d\n", ret);
  95                 return;
  96         }
  97 }