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Viewing changes to roms/skiboot/libc/string/memset.c

  • Committer: Phil Dennis-Jordan
  • Date: 2017-07-21 08:03:43 UTC
  • mfrom: (1.1.1)
  • Revision ID: phil@philjordan.eu-20170721080343-2yr2vdj7713czahv
New upstream release 2.9.0.

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roms/skiboot/libc/string/memset.c
 
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/******************************************************************************
 
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 * Copyright (c) 2004, 2008 IBM Corporation
 
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 * All rights reserved.
 
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 * This program and the accompanying materials
 
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 * are made available under the terms of the BSD License
 
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 * which accompanies this distribution, and is available at
 
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 * http://www.opensource.org/licenses/bsd-license.php
 
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 *
 
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 * Contributors:
 
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 *     IBM Corporation - initial implementation
 
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 *****************************************************************************/
 
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#include "string.h"
 
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#define CACHE_LINE_SIZE 128
 
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void *
 
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memset(void *dest, int c, size_t size)
 
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{
 
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        unsigned char *d = (unsigned char *)dest;
 
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#if defined(__powerpc__) || defined(__powerpc64__)
 
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        if (size > CACHE_LINE_SIZE && c==0) {
 
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                while ((unsigned long long)d % CACHE_LINE_SIZE) {
 
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                        *d++ = (unsigned char)c;
 
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                        size--;
 
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                }
 
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                while (size >= CACHE_LINE_SIZE) {
 
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                        asm volatile ("dcbz 0,%0\n" : : "r"(d) : "memory");
 
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                        d+= CACHE_LINE_SIZE;
 
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                        size-= CACHE_LINE_SIZE;
 
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                }
 
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        }
 
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#endif
 
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        while (size >= 8 && c == 0) {
 
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                *((unsigned long long*)d) = 0ULL;
 
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                d+=8;
 
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                size-=8;
 
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        }
 
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        while (size-- > 0) {
 
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                *d++ = (unsigned char)c;
 
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        }
 
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        return dest;
 
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}