bsd/dev/ppc/kern_machdep.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  *      Copyright (C) 1990, 1993  NeXT, Inc.
  27  *      Copyright (C) 1997  Apple Computer, Inc.
  28  *
  29  *      File:   next/kern_machdep.c
  30  *      Author: John Seamons
  31  *
  32  *      Machine-specific kernel routines.
  33  *
  34  * HISTORY
  35  *  8-Dec-91  Peter King (king) at NeXT
  36  *      Added grade_cpu_subtype().
  37  *      FIXME: Do we want to merge this with check_cpu_subtype()?
  38  *
  39  *  5-Mar-90  John Seamons (jks) at NeXT
  40  *      Created.
  41  */
  42
  43 #include        <sys/types.h>
  44 #include        <sys/param.h>
  45 #include        <mach/machine.h>
  46 #include        <mach/boolean.h>
  47 #include        <mach/vm_param.h>
  48 #include        <kern/cpu_number.h>
  49
  50 int
  51 check_cpu_subtype(cpu_subtype_t cpu_subtype)
  52 {
  53         struct machine_slot *ms = &machine_slot[cpu_number()];
  54
  55         if (cpu_subtype == ms->cpu_subtype)
  56                 return (TRUE);
  57
  58         switch (cpu_subtype) {
  59                 case CPU_SUBTYPE_POWERPC_970:
  60                 case CPU_SUBTYPE_POWERPC_7450:
  61                 case CPU_SUBTYPE_POWERPC_7400:
  62                 case CPU_SUBTYPE_POWERPC_750:
  63                 case CPU_SUBTYPE_POWERPC_ALL:
  64                         return (TRUE);
  65         }
  66
  67         return (FALSE);
  68 }
  69
  70 /*
  71  * Routine: grade_cpu_subtype()
  72  *
  73  * Function:
  74  *      Return a relative preference for cpu_subtypes in fat executable files.
  75  *      The higher the grade, the higher the preference.
  76  *      A grade of 0 means not acceptable.
  77  */
  78
  79 int
  80 grade_cpu_subtype(cpu_subtype_t cpu_subtype)
  81 {
  82         struct machine_slot *ms = &machine_slot[cpu_number()];
  83
  84         /*
  85          * This code should match cpusubtype_findbestarch() in best_arch.c in the
  86          * cctools project.  As of 2/16/98 this is what has been agreed upon for
  87          * the PowerPC subtypes.  If an exact match is not found the subtype will
  88          * be picked from the following order:
  89          *              970, 7450, 7400, 750, ALL
  90          * Note the 601 is NOT in the list above.  It is only picked via an exact
  91          * match. For details see Radar 2213821.
  92          *
  93          * To implement this function to follow what was agreed upon above, we use
  94          * the fact there are currently 4 different subtypes.  Exact matches return
  95          * the value 6, and the values 5 thru 1 are returned for the
  96          * subtypes listed in the order above.
  97          */
  98         if (ms->cpu_subtype == cpu_subtype)
  99                 return 6;
 100         switch (cpu_subtype) {
 101                 case CPU_SUBTYPE_POWERPC_970:
 102                         return 5;
 103                 case CPU_SUBTYPE_POWERPC_7450:
 104                         return 4;
 105                 case CPU_SUBTYPE_POWERPC_7400:
 106                         return 3;
 107                 case CPU_SUBTYPE_POWERPC_750:
 108                         return 2;
 109                 case CPU_SUBTYPE_POWERPC_ALL:
 110                         return 1;
 111         }
 112         /*
 113          * If we get here it is because it is a cpusubtype we don't support
 114          * or a new cpusubtype that was added since this code was written.  Both
 115          * will be considered unacceptable.
 116          */
 117         return 0;
 118 }
 119
 120 boolean_t
 121 kernacc(
 122     off_t       start,
 123     size_t      len
 124 )
 125 {
 126         off_t base;
 127         off_t end;
 128
 129         base = trunc_page_64(start);
 130         end = start + len;
 131
 132         while (base < end) {
 133                 if(kvtophys((vm_offset_t)base) == NULL)
 134                         return(FALSE);
 135                 base += page_size;
 136         }
 137
 138         return (TRUE);
 139 }