1 /* 2 * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef __UTILS_H__ 32 #define __UTILS_H__ 33 34 #if !ERROR_DEPRECATED 35 #include <utils_def.h> 36 #endif 37 38 /* 39 * C code should be put in this part of the header to avoid breaking ASM files 40 * or linker scripts including it. 41 */ 42 #if !(defined(__LINKER__) || defined(__ASSEMBLY__)) 43 44 #include <types.h> 45 46 /* 47 * Fill a region of normal memory of size "length" in bytes with zero bytes. 48 * 49 * WARNING: This function can only operate on normal memory. This means that 50 * the MMU must be enabled when using this function. Otherwise, use 51 * zeromem. 52 */ 53 void zero_normalmem(void *mem, u_register_t length); 54 55 /* 56 * Fill a region of memory of size "length" in bytes with null bytes. 57 * 58 * Unlike zero_normalmem, this function has no restriction on the type of 59 * memory targeted and can be used for any device memory as well as normal 60 * memory. This function must be used instead of zero_normalmem when MMU is 61 * disabled. 62 * 63 * NOTE: When data cache and MMU are enabled, prefer zero_normalmem for faster 64 * zeroing. 65 */ 66 void zeromem(void *mem, u_register_t length); 67 #endif /* !(defined(__LINKER__) || defined(__ASSEMBLY__)) */ 68 69 #endif /* __UTILS_H__ */ 70