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  * 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  *      Copyright (C) 1990, 1993  NeXT, Inc.
  24  *      Copyright (C) 1997  Apple Computer, Inc.
  25  *
  26  *      File:   next/kern_machdep.c
  27  *      Author: John Seamons
  28  *
  29  *      Machine-specific kernel routines.
  30  *
  31  * HISTORY
  32  *  8-Dec-91  Peter King (king) at NeXT
  33  *      Added grade_cpu_subtype().
  34  *      FIXME: Do we want to merge this with check_cpu_subtype()?
  35  *
  36  *  5-Mar-90  John Seamons (jks) at NeXT
  37  *      Created.
  38  */
  39
  40 #include        <sys/types.h>
  41 #include        <sys/param.h>
  42 #include        <mach/machine.h>
  43 #include        <mach/boolean.h>
  44 #include        <mach/vm_param.h>
  45 #include        <kern/cpu_number.h>
  46
  47 int
  48 check_cpu_subtype(cpu_subtype_t cpu_subtype)
  49 {
  50         struct machine_slot *ms = &machine_slot[cpu_number()];
  51
  52         if (cpu_subtype == ms->cpu_subtype)
  53                 return (TRUE);
  54
  55         if (cpu_subtype == CPU_SUBTYPE_POWERPC_601)
  56                 return (FALSE);
  57
  58         switch (cpu_subtype) {
  59                 case CPU_SUBTYPE_POWERPC_7450:
  60                 case CPU_SUBTYPE_POWERPC_7400:
  61                 case CPU_SUBTYPE_POWERPC_750:
  62                 case CPU_SUBTYPE_POWERPC_604e:
  63                 case CPU_SUBTYPE_POWERPC_604:
  64                 case CPU_SUBTYPE_POWERPC_603ev:
  65                 case CPU_SUBTYPE_POWERPC_603e:
  66                 case CPU_SUBTYPE_POWERPC_603:
  67                 case CPU_SUBTYPE_POWERPC_ALL:
  68                         return (TRUE);
  69         }
  70
  71         return (FALSE);
  72 }
  73
  74 /*
  75  * Routine: grade_cpu_subtype()
  76  *
  77  * Function:
  78  *      Return a relative preference for cpu_subtypes in fat executable files.
  79  *      The higher the grade, the higher the preference.
  80  *      A grade of 0 means not acceptable.
  81  */
  82
  83 int
  84 grade_cpu_subtype(cpu_subtype_t cpu_subtype)
  85 {
  86         struct machine_slot *ms = &machine_slot[cpu_number()];
  87
  88         /*
  89          * This code should match cpusubtype_findbestarch() in best_arch.c in the
  90          * cctools project.  As of 2/16/98 this is what has been agreed upon for
  91          * the PowerPC subtypes.  If an exact match is not found the subtype will
  92          * be picked from the following order:
  93          *              7400, 750, 604e, 604, 603ev, 603e, 603, ALL
  94          * Note the 601 is NOT in the list above.  It is only picked via an exact
  95          * match. For details see Radar 2213821.
  96          *
  97          * To implement this function to follow what was agreed upon above, we use
  98          * the fact there are currently 10 different subtypes.  Exact matches return
  99          * the value 10, the value 0 is returned for 601 that is not an exact match,
 100          * and the values 9 thru 1 are returned for the subtypes listed in the order
 101          * above.
 102          */
 103         if (ms->cpu_subtype == cpu_subtype)
 104                 return 10;
 105         if (cpu_subtype == CPU_SUBTYPE_POWERPC_601)
 106                 return 0;
 107         switch (cpu_subtype) {
 108                 case CPU_SUBTYPE_POWERPC_7450:
 109                         return 9;
 110                 case CPU_SUBTYPE_POWERPC_7400:
 111                         return 8;
 112                 case CPU_SUBTYPE_POWERPC_750:
 113                         return 7;
 114                 case CPU_SUBTYPE_POWERPC_604e:
 115                         return 6;
 116                 case CPU_SUBTYPE_POWERPC_604:
 117                         return 5;
 118                 case CPU_SUBTYPE_POWERPC_603ev:
 119                         return 4;
 120                 case CPU_SUBTYPE_POWERPC_603e:
 121                         return 3;
 122                 case CPU_SUBTYPE_POWERPC_603:
 123                         return 2;
 124                 case CPU_SUBTYPE_POWERPC_ALL:
 125                         return 1;
 126         }
 127         /*
 128          * If we get here it is because it is a cpusubtype we don't support (602 and
 129          * 620) or new cpusubtype that was added since this code was written.  Both
 130          * will be considered unacceptable.
 131          */
 132         return 0;
 133 }
 134
 135 boolean_t
 136 kernacc(
 137     off_t       start,
 138     size_t      len
 139 )
 140 {
 141         off_t base;
 142         off_t end;
 143
 144         base = trunc_page(start);
 145         end = start + len;
 146
 147         while (base < end) {
 148                 if(kvtophys((vm_offset_t)base) == NULL)
 149                         return(FALSE);
 150                 base += page_size;
 151         }
 152
 153         return (TRUE);
 154 }