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69 lines
1.5 KiB
69 lines
1.5 KiB
20 years ago
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/*
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* arch/v850/lib/memset.c -- Memory initialization
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*
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* Copyright (C) 2001,02,04 NEC Corporation
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* Copyright (C) 2001,02,04 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#include <linux/types.h>
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void *memset (void *dst, int val, __kernel_size_t count)
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{
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if (count) {
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register unsigned loop;
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register void *ptr asm ("ep") = dst;
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/* replicate VAL into a long. */
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val &= 0xff;
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val |= val << 8;
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val |= val << 16;
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/* copy initial unaligned bytes. */
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if ((long)ptr & 1) {
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*(char *)ptr = val;
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ptr = (void *)((char *)ptr + 1);
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count--;
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}
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if (count > 2 && ((long)ptr & 2)) {
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*(short *)ptr = val;
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ptr = (void *)((short *)ptr + 1);
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count -= 2;
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}
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/* 32-byte copying loop. */
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for (loop = count / 32; loop; loop--) {
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asm ("sst.w %0, 0[ep]; sst.w %0, 4[ep];"
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"sst.w %0, 8[ep]; sst.w %0, 12[ep];"
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"sst.w %0, 16[ep]; sst.w %0, 20[ep];"
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"sst.w %0, 24[ep]; sst.w %0, 28[ep]"
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:: "r" (val) : "memory");
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ptr += 32;
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}
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count %= 32;
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/* long copying loop. */
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for (loop = count / 4; loop; loop--) {
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*(long *)ptr = val;
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ptr = (void *)((long *)ptr + 1);
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}
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count %= 4;
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/* finish up with any trailing bytes. */
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if (count & 2) {
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*(short *)ptr = val;
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ptr = (void *)((short *)ptr + 1);
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}
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if (count & 1) {
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*(char *)ptr = val;
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}
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}
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return dst;
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}
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