arm-trusted-firmware/include/lib/utils.h

/*
 * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __UTILS_H__
#define __UTILS_H__

#if !ERROR_DEPRECATED
#include <utils_def.h>
#endif

/*
 * C code should be put in this part of the header to avoid breaking ASM files
 * or linker scripts including it.
 */
#if !(defined(__LINKER__) || defined(__ASSEMBLY__))

#include <types.h>

/*
 * Fill a region of normal memory of size "length" in bytes with zero bytes.
 *
 * WARNING: This function can only operate on normal memory. This means that
 *          the MMU must be enabled when using this function. Otherwise, use
 *          zeromem.
 */
void zero_normalmem(void *mem, u_register_t length);

/*
 * Fill a region of memory of size "length" in bytes with null bytes.
 *
 * Unlike zero_normalmem, this function has no restriction on the type of
 * memory targeted and can be used for any device memory as well as normal
 * memory. This function must be used instead of zero_normalmem when MMU is
 * disabled.
 *
 * NOTE: When data cache and MMU are enabled, prefer zero_normalmem for faster
 *       zeroing.
 */
void zeromem(void *mem, u_register_t length);
#endif /* !(defined(__LINKER__) || defined(__ASSEMBLY__)) */

#endif /* __UTILS_H__ */