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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#ifndef _BOOT_DEVICE_H_
#define _BOOT_DEVICE_H_
#include <commonlib/region.h>
/*
* Boot device region can be protected by 2 sources, media and controller.
* The following modes are identified. It depends on the flash chip and the
* controller if mode is actually supported.
*
* MEDIA_WP : Flash/Boot device enforces write protect
* CTRLR_WP : Controller device enforces write protect
* CTRLR_RP : Controller device enforces read protect
* CTRLR_RWP : Controller device enforces read-write protect
*/
enum bootdev_prot_type {
CTRLR_WP = 1,
CTRLR_RP = 2,
CTRLR_RWP = 3,
MEDIA_WP = 4,
};
/*
* Please note that the read-only boot device may not be coherent with
* the read-write boot device. Thus, mixing mmap() and writeat() is
* most likely not to work so don't rely on such semantics.
*/
/* Return the region_device for the read-only boot device. */
const struct region_device *boot_device_ro(void);
/* Return the region_device for the read-write boot device. */
const struct region_device *boot_device_rw(void);
/*
* Create a sub-region of the read-only boot device.
* Returns 0 on success, < 0 on error.
*/
int boot_device_ro_subregion(const struct region *sub,
struct region_device *subrd);
/*
* Create a sub-region of the read-write boot device.
* Returns 0 on success, < 0 on error.
*/
int boot_device_rw_subregion(const struct region *sub,
struct region_device *subrd);
/*
* Write protect a sub-region of the boot device represented
* by the region device.
* Returns 0 on success, < 0 on error.
*/
int boot_device_wp_region(const struct region_device *rd,
const enum bootdev_prot_type type);
/*
* Initialize the boot device. This may be called multiple times within
* a stage so boot device implementations should account for this behavior.
**/
void boot_device_init(void);
/*
* Restrict read/write access to the bootmedia using platform defined rules.
*/
#if CONFIG(BOOTMEDIA_LOCK_NONE)
static inline void boot_device_security_lockdown(void) {}
#else
void boot_device_security_lockdown(void);
#endif
#endif /* _BOOT_DEVICE_H_ */
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