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         switch (cpu_subtype) {
  56                 case CPU_SUBTYPE_POWERPC_970:
  57                                 /* Do not allow a 970 binary to run on non-970 systems */
  58                                 if (ms->cpu_subtype != CPU_SUBTYPE_POWERPC_970)
  59                                 break;
  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(but only on 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                                 /* Do not allow a 970 binary to run on non-970 systems */
 103                                 if (ms->cpu_subtype != CPU_SUBTYPE_POWERPC_970)
 104                                         break;
 105                         return 5;
 106                 case CPU_SUBTYPE_POWERPC_7450:
 107                         return 4;
 108                 case CPU_SUBTYPE_POWERPC_7400:
 109                         return 3;
 110                 case CPU_SUBTYPE_POWERPC_750:
 111                         return 2;
 112                 case CPU_SUBTYPE_POWERPC_ALL:
 113                         return 1;
 114         }
 115         /*
 116          * If we get here it is because it is a cpusubtype we don't support
 117          * or a new cpusubtype that was added since this code was written.  Both
 118          * will be considered unacceptable.
 119          */
 120         return 0;
 121 }
 122
 123 boolean_t
 124 kernacc(
 125     off_t       start,
 126     size_t      len
 127 )
 128 {
 129         off_t base;
 130         off_t end;
 131
 132         base = trunc_page_64(start);
 133         end = start + len;
 134
 135         while (base < end) {
 136                 if(kvtophys((vm_offset_t)base) == NULL)
 137                         return(FALSE);
 138                 base += page_size;
 139         }
 140
 141         return (TRUE);
 142 }