| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2006 by Thom Johansen |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * 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 |