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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2016 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <cbfs.h>
#include <compiler.h>
#include <console/console.h>
#include <arch/acpi.h>
#include <bootmode.h>
#include <bootstate.h>
#include "vbt.h"
#define VBT_SIGNATURE 0x54425624
__weak
const char *mainboard_vbt_filename(void)
{
return "vbt.bin";
}
static char vbt_data[8 * KiB];
static int vbt_data_used;
void *locate_vbt(void)
{
uint32_t vbtsig = 0;
if (vbt_data_used == 1)
return (void *)vbt_data;
const char *filename = mainboard_vbt_filename();
size_t file_size = cbfs_boot_load_file(filename,
vbt_data, sizeof(vbt_data), CBFS_TYPE_RAW);
if (file_size == 0)
return NULL;
memcpy(&vbtsig, vbt_data, sizeof(vbtsig));
if (vbtsig != VBT_SIGNATURE) {
printk(BIOS_ERR, "Missing/invalid signature in VBT data file!\n");
return NULL;
}
printk(BIOS_INFO, "Found a VBT of %zu bytes after decompression\n",
file_size);
vbt_data_used = 1;
return (void *)vbt_data;
}
void *vbt_get(void)
{
if (!IS_ENABLED(CONFIG_RUN_FSP_GOP))
return NULL;
/* Normal mode and S3 resume path PEIM GFX init is not needed.
* Passing NULL as VBT will not make PEIM GFX to execute. */
if (acpi_is_wakeup_s3())
return NULL;
if (!display_init_required())
return NULL;
return locate_vbt();
}
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