pexpert/i386/pe_identify_machine.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 #include <pexpert/pexpert.h>
  23 #include <pexpert/protos.h>
  24 #include <pexpert/device_tree.h>
  25
  26 /* External declarations */
  27 unsigned int LockTimeOut = 12500000; /* XXX - Need real value for i386 */
  28
  29 /* Local declarations */
  30 void pe_identify_machine(boot_args *args);
  31
  32 /* pe_identify_machine:
  33  *
  34  *   Sets up platform parameters.
  35  *   Returns:    nothing
  36  */
  37 void pe_identify_machine(boot_args *args)
  38 {
  39   // Clear the gPEClockFrequencyInfo struct
  40   bzero((void *)&gPEClockFrequencyInfo, sizeof(clock_frequency_info_t));
  41
  42   // Start with default values.
  43   gPEClockFrequencyInfo.bus_clock_rate_hz = 100000000;
  44   gPEClockFrequencyInfo.cpu_clock_rate_hz = 300000000;
  45   gPEClockFrequencyInfo.dec_clock_rate_hz =  25000000;
  46
  47   // Get real number from some where.
  48
  49   // Set the num / den pairs form the hz values.
  50   gPEClockFrequencyInfo.bus_clock_rate_num = gPEClockFrequencyInfo.bus_clock_rate_hz;
  51   gPEClockFrequencyInfo.bus_clock_rate_den = 1;
  52
  53   gPEClockFrequencyInfo.bus_to_cpu_rate_num =
  54     (2 * gPEClockFrequencyInfo.cpu_clock_rate_hz) / gPEClockFrequencyInfo.bus_clock_rate_hz;
  55   gPEClockFrequencyInfo.bus_to_cpu_rate_den = 2;
  56
  57   gPEClockFrequencyInfo.bus_to_dec_rate_num = 1;
  58   gPEClockFrequencyInfo.bus_to_dec_rate_den =
  59     gPEClockFrequencyInfo.bus_clock_rate_hz / gPEClockFrequencyInfo.dec_clock_rate_hz;
  60 }