/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2006 by Thom Johansen * * All files in this archive are subject to the GNU General Public License. * See the file COPYING in the source tree root for full license agreement. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "config.h" .section .icode,"ax",%progbits .align 2 /* The following code is based on code from the Linux kernel version 2.6.15.3, * linux/arch/arm/lib/memset.S * * Copyright (C) 1995-2000 Russell King */ .global memset16 .type memset16,%function memset16: tst r0, #2 @ unaligned? cmpne r2, #0 strneh r1, [r0], #2 @ store one halfword to align subne r2, r2, #1 /* * we know that the pointer in r0 is aligned to a word boundary. */ orr r1, r1, r1, lsl #16 mov r3, r1 cmp r2, #8 blt 4f /* * We need an extra register for this loop - save the return address and * use the LR */ str lr, [sp, #-4]! mov ip, r1 mov lr, r1 2: subs r2, r2, #32 stmgeia r0!, {r1, r3, ip, lr} @ 64 bytes at a time. stmgeia r0!, {r1, r3, ip, lr} stmgeia r0!, {r1, r3, ip, lr} stmgeia r0!, {r1, r3, ip, lr} bgt 2b ldmeqfd sp!, {pc} @ Now <64 bytes to go. /* * No need to correct the count; we're only testing bits from now on */ tst r2, #16 stmneia r0!, {r1, r3, ip, lr} stmneia r0!, {r1, r3, ip, lr} tst r2, #8 stmneia r0!, {r1, r3, ip, lr} ldr lr, [sp], #4 4: tst r2, #4 stmneia r0!, {r1, r3} tst r2, #2 strne r1, [r0], #4 tst r2, #1 strneh r1, [r0], #2 bx lr .end: .size memset16,.end-memset16