pexpert/i386/pe_identify_machine.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #include <pexpert/pexpert.h>
  29 #include <pexpert/protos.h>
  30 #include <pexpert/device_tree.h>
  31
  32 /* Local declarations */
  33 void pe_identify_machine(boot_args *args);
  34
  35 /* pe_identify_machine:
  36  *
  37  *   Sets up platform parameters.
  38  *   Returns:    nothing
  39  */
  40 void pe_identify_machine(__unused boot_args *args)
  41 {
  42   // Clear the gPEClockFrequencyInfo struct
  43   bzero((void *)&gPEClockFrequencyInfo, sizeof(clock_frequency_info_t));
  44
  45   // Start with default values.
  46   gPEClockFrequencyInfo.timebase_frequency_hz = 1000000000;
  47   gPEClockFrequencyInfo.bus_frequency_hz      =  100000000;
  48   gPEClockFrequencyInfo.cpu_frequency_hz      =  300000000;
  49
  50   gPEClockFrequencyInfo.bus_frequency_min_hz = gPEClockFrequencyInfo.bus_frequency_hz;
  51   gPEClockFrequencyInfo.bus_frequency_max_hz = gPEClockFrequencyInfo.bus_frequency_hz;
  52   gPEClockFrequencyInfo.cpu_frequency_min_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
  53   gPEClockFrequencyInfo.cpu_frequency_max_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
  54
  55   gPEClockFrequencyInfo.dec_clock_rate_hz = gPEClockFrequencyInfo.timebase_frequency_hz;
  56   gPEClockFrequencyInfo.bus_clock_rate_hz = gPEClockFrequencyInfo.bus_frequency_hz;
  57   gPEClockFrequencyInfo.cpu_clock_rate_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
  58
  59   // Get real number from some where.
  60
  61   // Set the num / den pairs form the hz values.
  62   gPEClockFrequencyInfo.bus_clock_rate_num = gPEClockFrequencyInfo.bus_clock_rate_hz;
  63   gPEClockFrequencyInfo.bus_clock_rate_den = 1;
  64
  65   gPEClockFrequencyInfo.bus_to_cpu_rate_num =
  66     (2 * gPEClockFrequencyInfo.cpu_clock_rate_hz) / gPEClockFrequencyInfo.bus_clock_rate_hz;
  67   gPEClockFrequencyInfo.bus_to_cpu_rate_den = 2;
  68
  69   gPEClockFrequencyInfo.bus_to_dec_rate_num = 1;
  70   gPEClockFrequencyInfo.bus_to_dec_rate_den =
  71     gPEClockFrequencyInfo.bus_clock_rate_hz / gPEClockFrequencyInfo.dec_clock_rate_hz;
  72 }