osfmk/i386/loose_ends.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52 #include <mach_assert.h>
  53
  54 #include <string.h>
  55 #include <mach/boolean.h>
  56 #include <mach/i386/vm_types.h>
  57 #include <mach/i386/vm_param.h>
  58 #include <kern/kern_types.h>
  59 #include <kern/misc_protos.h>
  60 #include <i386/misc_protos.h>
  61
  62         /*
  63          * Should be rewritten in asm anyway.
  64          */
  65
  66 /*
  67  * bcopy_phys - like bcopy but copies from/to physical addresses.
  68  *              this is trivial since all phys mem is mapped into
  69  *              kernel virtual space
  70  */
  71
  72 void
  73 bcopy_phys(const char *from, char *to, vm_size_t bytes)
  74 {
  75   bcopy((char *)phystokv(from), (char *)phystokv(to), bytes);
  76 }
  77
  78
  79 /*
  80  * ovbcopy - like bcopy, but recognizes overlapping ranges and handles
  81  *           them correctly.
  82  */
  83
  84 void
  85 ovbcopy(
  86         const char      *from,
  87         char            *to,
  88         vm_size_t       bytes)          /* num bytes to copy */
  89 {
  90         /* Assume that bcopy copies left-to-right (low addr first). */
  91         if (from + bytes <= to || to + bytes <= from || to == from)
  92                 bcopy_no_overwrite(from, to, bytes);    /* non-overlapping or no-op*/
  93         else if (from > to)
  94                 bcopy_no_overwrite(from, to, bytes);    /* overlapping but OK */
  95         else {
  96                 /* to > from: overlapping, and must copy right-to-left. */
  97                 from += bytes - 1;
  98                 to += bytes - 1;
  99                 while (bytes-- > 0)
 100                         *to-- = *from--;
 101         }
 102 }
 103
 104 void
 105 bcopy(
 106         const char      *from,
 107         char            *to,
 108         vm_size_t       bytes)          /* num bytes to copy */
 109 {
 110         ovbcopy(from, to, bytes);
 111 }
 112
 113 int bcmp(
 114         const char      *a,
 115         const char      *b,
 116         vm_size_t       len)
 117 {
 118         if (len == 0)
 119                 return 0;
 120
 121         do
 122                 if (*a++ != *b++)
 123                         break;
 124         while (--len);
 125
 126         return len;
 127 }
 128
 129 int
 130 memcmp(s1, s2, n)
 131         register char *s1, *s2;
 132         register n;
 133 {
 134         while (--n >= 0)
 135                 if (*s1++ != *s2++)
 136                         return (*--s1 - *--s2);
 137         return (0);
 138 }
 139
 140 /*
 141  * Abstract:
 142  * strlen returns the number of characters in "string" preceeding
 143  * the terminating null character.
 144  */
 145
 146 size_t
 147 strlen(
 148         register const char *string)
 149 {
 150         register const char *ret = string;
 151
 152         while (*string++ != '\0')
 153                 continue;
 154         return string - 1 - ret;
 155 }
 156
 157 #if     MACH_ASSERT
 158
 159 /*
 160  * Machine-dependent routine to fill in an array with up to callstack_max
 161  * levels of return pc information.
 162  */
 163 void machine_callstack(
 164         natural_t       *buf,
 165         vm_size_t       callstack_max)
 166 {
 167 }
 168
 169 #endif  /* MACH_ASSERT */