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                                 /* Do not allow a 970 binary to run on non-970 systems */
  61                                 if (ms->cpu_subtype != CPU_SUBTYPE_POWERPC_970)
  62                                 break;
  63                 case CPU_SUBTYPE_POWERPC_7450:
  64                 case CPU_SUBTYPE_POWERPC_7400:
  65                 case CPU_SUBTYPE_POWERPC_750:
  66                 case CPU_SUBTYPE_POWERPC_ALL:
  67                         return (TRUE);
  68         }
  69
  70         return (FALSE);
  71 }
  72
  73 /*
  74  * Routine: grade_cpu_subtype()
  75  *
  76  * Function:
  77  *      Return a relative preference for cpu_subtypes in fat executable files.
  78  *      The higher the grade, the higher the preference.
  79  *      A grade of 0 means not acceptable.
  80  */
  81
  82 int
  83 grade_cpu_subtype(cpu_subtype_t cpu_subtype)
  84 {
  85         struct machine_slot *ms = &machine_slot[cpu_number()];
  86
  87         /*
  88          * This code should match cpusubtype_findbestarch() in best_arch.c in the
  89          * cctools project.  As of 2/16/98 this is what has been agreed upon for
  90          * the PowerPC subtypes.  If an exact match is not found the subtype will
  91          * be picked from the following order:
  92          *              970(but only on 970), 7450, 7400, 750, ALL
  93          * Note the 601 is NOT in the list above.  It is only picked via an exact
  94          * match. For details see Radar 2213821.
  95          *
  96          * To implement this function to follow what was agreed upon above, we use
  97          * the fact there are currently 4 different subtypes.  Exact matches return
  98          * the value 6, and the values 5 thru 1 are returned for the
  99          * subtypes listed in the order above.
 100          */
 101         if (ms->cpu_subtype == cpu_subtype)
 102                 return 6;
 103         switch (cpu_subtype) {
 104                 case CPU_SUBTYPE_POWERPC_970:
 105                                 /* Do not allow a 970 binary to run on non-970 systems */
 106                                 if (ms->cpu_subtype != CPU_SUBTYPE_POWERPC_970)
 107                                         break;
 108                         return 5;
 109                 case CPU_SUBTYPE_POWERPC_7450:
 110                         return 4;
 111                 case CPU_SUBTYPE_POWERPC_7400:
 112                         return 3;
 113                 case CPU_SUBTYPE_POWERPC_750:
 114                         return 2;
 115                 case CPU_SUBTYPE_POWERPC_ALL:
 116                         return 1;
 117         }
 118         /*
 119          * If we get here it is because it is a cpusubtype we don't support
 120          * or a new cpusubtype that was added since this code was written.  Both
 121          * will be considered unacceptable.
 122          */
 123         return 0;
 124 }
 125
 126 boolean_t
 127 kernacc(
 128     off_t       start,
 129     size_t      len
 130 )
 131 {
 132         off_t base;
 133         off_t end;
 134
 135         base = trunc_page_64(start);
 136         end = start + len;
 137
 138         while (base < end) {
 139                 if(kvtophys((vm_offset_t)base) == NULL)
 140                         return(FALSE);
 141                 base += page_size;
 142         }
 143
 144         return (TRUE);
 145 }