coreboot-kgpe-d16/src/security/vboot/vboot_common.h

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2014 Google, Inc.
 *
 * 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.
 */
#ifndef __VBOOT_VBOOT_COMMON_H__
#define __VBOOT_VBOOT_COMMON_H__

#include <commonlib/region.h>
#include <stdint.h>
#include <vboot_api.h>
#include <vboot_struct.h>

/* Locate vboot area by name. Returns 0 on success and -1 on error. */
int vboot_named_region_device(const char *name, struct region_device *rdev);

/* Like vboot_named_region_device() but provides a RW region device. */
int vboot_named_region_device_rw(const char *name, struct region_device *rdev);

/*
 * Function to check if there is a request to enter recovery mode. Returns
 * reason code if request to enter recovery mode is present, otherwise 0.
 */
int vboot_check_recovery_request(void);

/* ============================ VBOOT REBOOT ============================== */
/*
 * vboot_reboot handles the reboot requests made by vboot_reference library. It
 * allows the platform to run any preparation steps before the reboot and then
 * does a hard reset.
 */
void vboot_reboot(void);

/* Allow the platform to do any clean up work when vboot requests a reboot. */
void vboot_platform_prepare_reboot(void);

/* ============================ VBOOT RESUME ============================== */
/*
 * Save the provided hash digest to a secure location to check against in
 * the resume path. Returns 0 on success, < 0 on error.
 */
int vboot_save_hash(void *digest, size_t digest_size);

/*
 * Retrieve the previously saved hash digest.  Returns 0 on success,
 * < 0 on error.
 */
int vboot_retrieve_hash(void *digest, size_t digest_size);

/*
 * Determine if the platform is resuming from suspend. Returns 0 when
 * not resuming, > 0 if resuming, and < 0 on error.
 */
int vboot_platform_is_resuming(void);

/* ============================= VERSTAGE ================================== */
/*
 * Main logic for verified boot. verstage_main() is just the core vboot logic.
 * If the verstage is a separate stage, it should be entered via main().
 */
void verstage_main(void);
void verstage_mainboard_init(void);

/* Check boot modes */
#if CONFIG(VBOOT)
int vboot_developer_mode_enabled(void);
int vboot_recovery_mode_enabled(void);
int vboot_recovery_mode_memory_retrain(void);
int vboot_can_enable_udc(void);
#else /* !CONFIG_VBOOT */
static inline int vboot_developer_mode_enabled(void) { return 0; }
static inline int vboot_recovery_mode_enabled(void) { return 0; }
static inline int vboot_recovery_mode_memory_retrain(void) { return 0; }
/* If VBOOT is not enabled, we are okay enabling USB device controller (UDC). */
static inline int vboot_can_enable_udc(void) { return 1; }
#endif

#endif /* __VBOOT_VBOOT_COMMON_H__ */