| 0,0 → 1,136 |
|---|
| /* |
| * Copyright (C) 2005 Sergey Bondari |
| * 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. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 __amd64_MEMSTR_H__ |
| #define __amd64_MEMSTR_H__ |
| |
| /** Copy memory |
| * |
| * Copy a given number of bytes (3rd argument) |
| * from the memory location defined by 2nd argument |
| * to the memory location defined by 1st argument. |
| * The memory areas cannot overlap. |
| * |
| * @param dst Destination |
| * @param src Source |
| * @param cnt Number of bytes |
| * @return Destination |
| */ |
| static inline void * memcpy(void * dst, const void * src, size_t cnt) |
| { |
| __native d0, d1, d2; |
| |
| __asm__ __volatile__( |
| "rep movsq\n\t" |
| "movq %4, %%rcx\n\t" |
| "andq $7, %%rcx\n\t" |
| "jz 1f\n\t" |
| "rep movsb\n\t" |
| "1:\n" |
| : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
| : "0" ((__native)(cnt / 8)), "g" ((__native)cnt), "1" ((__native) dst), "2" ((__native) src) |
| : "memory"); |
| |
| return dst; |
| } |
| |
| |
| /** Compare memory regions for equality |
| * |
| * Compare a given number of bytes (3rd argument) |
| * at memory locations defined by 1st and 2nd argument |
| * for equality. If bytes are equal function returns 0. |
| * |
| * @param src Region 1 |
| * @param dst Region 2 |
| * @param cnt Number of bytes |
| * @return Zero if bytes are equal, non-zero otherwise |
| */ |
| static inline int memcmp(const void * src, const void * dst, size_t cnt) |
| { |
| __native d0, d1, d2; |
| __native ret; |
| |
| __asm__ ( |
| "repe cmpsb\n\t" |
| "je 1f\n\t" |
| "movq %3, %0\n\t" |
| "addq $1, %0\n\t" |
| "1:\n" |
| : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2) |
| : "0" (0), "1" (src), "2" (dst), "3" ((__native)cnt) |
| ); |
| |
| return ret; |
| } |
| |
| /** Fill memory with words |
| * Fill a given number of words (2nd argument) |
| * at memory defined by 1st argument with the |
| * word value defined by 3rd argument. |
| * |
| * @param dst Destination |
| * @param cnt Number of words |
| * @param x Value to fill |
| */ |
| static inline void memsetw(__address dst, size_t cnt, __u16 x) |
| { |
| __native d0, d1; |
| |
| __asm__ __volatile__ ( |
| "rep stosw\n\t" |
| : "=&D" (d0), "=&c" (d1), "=a" (x) |
| : "0" (dst), "1" ((__native)cnt), "2" (x) |
| : "memory" |
| ); |
| |
| } |
| |
| /** Fill memory with bytes |
| * Fill a given number of bytes (2nd argument) |
| * at memory defined by 1st argument with the |
| * word value defined by 3rd argument. |
| * |
| * @param dst Destination |
| * @param cnt Number of bytes |
| * @param x Value to fill |
| */ |
| static inline void memsetb(__address dst, size_t cnt, __u8 x) |
| { |
| __native d0, d1; |
| |
| __asm__ __volatile__ ( |
| "rep stosb\n\t" |
| : "=&D" (d0), "=&c" (d1), "=a" (x) |
| : "0" (dst), "1" ((__native)cnt), "2" (x) |
| : "memory" |
| ); |
| |
| } |
| |
| #endif |