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 /* Local declarations */
  27 void pe_identify_machine(boot_args *args);
  28
  29 /* pe_identify_machine:
  30  *
  31  *   Sets up platform parameters.
  32  *   Returns:    nothing
  33  */
  34 void pe_identify_machine(boot_args *args)
  35 {
  36   // Clear the gPEClockFrequencyInfo struct
  37   bzero((void *)&gPEClockFrequencyInfo, sizeof(clock_frequency_info_t));
  38
  39   // Start with default values.
  40   gPEClockFrequencyInfo.bus_clock_rate_hz = 100000000;
  41   gPEClockFrequencyInfo.cpu_clock_rate_hz = 300000000;
  42   gPEClockFrequencyInfo.dec_clock_rate_hz =  25000000;
  43
  44   // Get real number from some where.
  45
  46   // Set the num / den pairs form the hz values.
  47   gPEClockFrequencyInfo.bus_clock_rate_num = gPEClockFrequencyInfo.bus_clock_rate_hz;
  48   gPEClockFrequencyInfo.bus_clock_rate_den = 1;
  49
  50   gPEClockFrequencyInfo.bus_to_cpu_rate_num =
  51     (2 * gPEClockFrequencyInfo.cpu_clock_rate_hz) / gPEClockFrequencyInfo.bus_clock_rate_hz;
  52   gPEClockFrequencyInfo.bus_to_cpu_rate_den = 2;
  53
  54   gPEClockFrequencyInfo.bus_to_dec_rate_num = 1;
  55   gPEClockFrequencyInfo.bus_to_dec_rate_den =
  56     gPEClockFrequencyInfo.bus_clock_rate_hz / gPEClockFrequencyInfo.dec_clock_rate_hz;
  57 }