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/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*/
/*
* Memory wipe library for easily set and exclude memory regions that need
* to be cleared.
*
* The following methods must be called in order:
* memory_wipe_init
* memory_wipe_exclude
* memory_wipe_execute
*/
#ifndef CHROMEOS_MEMORY_WIPE_H_
#define CHROMEOS_MEMORY_WIPE_H_
#include <linux/types.h>
#define MAX_EXCLUDED_REGIONS 16
typedef struct {
uintptr_t start;
uintptr_t end;
} memory_region_t;
typedef struct {
memory_region_t whole;
memory_region_t excluded[MAX_EXCLUDED_REGIONS];
int excluded_count;
} memory_wipe_t;
/*
* Initializes the memory region that needs to be cleared.
*/
void memory_wipe_init(memory_wipe_t *wipe, uintptr_t start, uintptr_t end);
/*
* Excludes a memory region from the to-be-cleared region.
* The function returns 0 on success; otherwise -1.
*/
int memory_wipe_exclude(memory_wipe_t *wipe, uintptr_t start, uintptr_t end);
/*
* Executes the memory wipe to the memory regions which was not excluded.
*/
void memory_wipe_execute(memory_wipe_t *wipe);
#endif /* CHROMEOS_MEMORY_WIPE_H */
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