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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 <console/console.h>
#include <arch/acpi.h>
#include <bootmode.h>
#include "vbt.h"
#define VBT_SIGNATURE 0x54425624
enum cb_err locate_vbt(struct region_device *rdev)
{
uint32_t vbtsig = 0;
struct cbfsf file_desc;
if (cbfs_boot_locate(&file_desc, "vbt.bin", NULL) < 0) {
printk(BIOS_ERR, "Could not locate a VBT file in in CBFS\n");
return CB_ERR;
}
cbfs_file_data(rdev, &file_desc);
rdev_readat(rdev, &vbtsig, 0, sizeof(uint32_t));
if (vbtsig != VBT_SIGNATURE) {
printk(BIOS_ERR, "Missing/invalid signature in VBT data file!\n");
return CB_ERR;
}
return CB_SUCCESS;
}
void *vbt_get(struct region_device *rdev)
{
void *vbt_data;
/* 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;
if (locate_vbt(rdev) != CB_ERR) {
vbt_data = rdev_mmap_full(rdev);
return vbt_data;
} else {
return NULL;
}
}
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