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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>
/* A node in a linked list of edges, each at position "pos". */
typedef struct memory_wipe_edge_t {
struct memory_wipe_edge_t *next;
uintptr_t pos;
} memory_wipe_edge_t;
/*
* Data describing memory to wipe. Contains a linked list of edges between the
* regions of memory to wipe and not wipe.
*/
typedef struct memory_wipe_t {
memory_wipe_edge_t head;
} memory_wipe_t;
/*
* Initializes the memory region that needs to be cleared.
*
* @param wipe Wipe structure to initialize.
*/
void memory_wipe_init(memory_wipe_t *wipe);
/*
* Adds a memory region to be cleared.
*
* @param wipe Wipe structure to add the region to.
* @param start The start of the region.
* @param end The end of the region.
*/
void memory_wipe_add(memory_wipe_t *wipe, uintptr_t start, uintptr_t end);
/*
* Subtracts a memory region.
*
* @param wipe Wipe structure to subtract the region from.
* @param start The start of the region.
* @param end The end of the region.
*/
void memory_wipe_sub(memory_wipe_t *wipe, uintptr_t start, uintptr_t end);
/*
* Executes the memory wipe.
*
* @param wipe Wipe structure to execute.
*/
void memory_wipe_execute(memory_wipe_t *wipe);
#endif /* CHROMEOS_MEMORY_WIPE_H */
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