78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2015 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _BOOT_DEVICE_H_
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#define _BOOT_DEVICE_H_
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#include <commonlib/region.h>
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/*
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* Boot device region can be protected by 2 sources, media and controller.
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* The following modes are identified. It depends on the flash chip and the
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* controller if mode is actually supported.
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*
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* MEDIA_WP : Flash/Boot device enforces write protect
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* CTRLR_WP : Controller device enforces write protect
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* CTRLR_RP : Controller device enforces read protect
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* CTRLR_RWP : Controller device enforces read-write protect
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*/
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enum bootdev_prot_type {
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CTRLR_WP = 1,
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CTRLR_RP = 2,
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CTRLR_RWP = 3,
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MEDIA_WP = 4,
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};
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/*
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* Please note that the read-only boot device may not be coherent with
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* the read-write boot device. Thus, mixing mmap() and writeat() is
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* most likely not to work so don't rely on such semantics.
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*/
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/* Return the region_device for the read-only boot device. */
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const struct region_device *boot_device_ro(void);
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/* Return the region_device for the read-write boot device. */
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const struct region_device *boot_device_rw(void);
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/*
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* Create a sub-region of the read-only boot device.
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* Returns 0 on success, < 0 on error.
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*/
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int boot_device_ro_subregion(const struct region *sub,
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struct region_device *subrd);
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/*
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* Create a sub-region of the read-write boot device.
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* Returns 0 on success, < 0 on error.
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*/
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int boot_device_rw_subregion(const struct region *sub,
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struct region_device *subrd);
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/*
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* Write protect a sub-region of the boot device represented
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* by the region device.
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* Returns 0 on success, < 0 on error.
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*/
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int boot_device_wp_region(struct region_device *rd,
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const enum bootdev_prot_type type);
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/*
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* Initialize the boot device. This may be called multiple times within
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* a stage so boot device implementations should account for this behavior.
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**/
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void boot_device_init(void);
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#endif /* _BOOT_DEVICE_H_ */
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