bzero.s

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        bzero.s,v $
   29  * Revision 2.5  93/02/04  07:55:45  danner
   30  *      Convert asm comment "/" over to "/ *" "* /"
   31  *      [93/01/27            rvb]
   32  * 
   33  * Revision 2.4  91/05/14  16:04:14  mrt
   34  *      Correcting copyright
   35  * 
   36  * Revision 2.3  91/02/05  17:10:53  mrt
   37  *      Changed to new Mach copyright
   38  *      [91/02/01  17:30:45  mrt]
   39  * 
   40  * Revision 2.2  90/05/03  15:24:56  dbg
   41  *      From Bob Baron.
   42  *      [90/04/30            dbg]
   43  * 
   44  */
   45 
   46 #include <i386/asm.h>
   47 
   48 /*
   49  * bzero(char * addr, unsigned int length)
   50  */
   51 Entry(blkclr)
   52 ENTRY(bzero)
   53         pushl   %ebp
   54         movl    %esp,%ebp
   55         pushl   %edi
   56         movl    B_ARG1,%edx
   57         movl    B_ARG0,%edi
   58         xorl    %eax,%eax
   59         cld
   60 /* zero longs */
   61         movl    %edx,%ecx
   62         shrl    $2,%ecx
   63         rep
   64         stosl
   65 /* zero bytes */
   66         movl    %edx,%ecx
   67         andl    $3,%ecx
   68         rep
   69         stosb
   70         popl    %edi
   71         leave
   72         ret

Cache object: 16a67edc476348d8040ef967baed27a6

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FreeBSD/Linux Kernel Cross Reference sys/i386/bzero.s

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sys/i386/bzero.s