The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/pexpert/i386/pe_identify_machine.c

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    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 = 1250000000; /* 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(__unused 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.timebase_frequency_hz = 1000000000;
   44   gPEClockFrequencyInfo.bus_frequency_hz      =  100000000;
   45   gPEClockFrequencyInfo.cpu_frequency_hz      =  300000000;
   46   
   47   gPEClockFrequencyInfo.bus_frequency_min_hz = gPEClockFrequencyInfo.bus_frequency_hz;
   48   gPEClockFrequencyInfo.bus_frequency_max_hz = gPEClockFrequencyInfo.bus_frequency_hz;
   49   gPEClockFrequencyInfo.cpu_frequency_min_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
   50   gPEClockFrequencyInfo.cpu_frequency_max_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
   51   
   52   gPEClockFrequencyInfo.dec_clock_rate_hz = gPEClockFrequencyInfo.timebase_frequency_hz;
   53   gPEClockFrequencyInfo.bus_clock_rate_hz = gPEClockFrequencyInfo.bus_frequency_hz;
   54   gPEClockFrequencyInfo.cpu_clock_rate_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
   55   
   56   // Get real number from some where.
   57   
   58   // Set the num / den pairs form the hz values.
   59   gPEClockFrequencyInfo.bus_clock_rate_num = gPEClockFrequencyInfo.bus_clock_rate_hz;
   60   gPEClockFrequencyInfo.bus_clock_rate_den = 1;
   61   
   62   gPEClockFrequencyInfo.bus_to_cpu_rate_num =
   63     (2 * gPEClockFrequencyInfo.cpu_clock_rate_hz) / gPEClockFrequencyInfo.bus_clock_rate_hz;
   64   gPEClockFrequencyInfo.bus_to_cpu_rate_den = 2;
   65   
   66   gPEClockFrequencyInfo.bus_to_dec_rate_num = 1;
   67   gPEClockFrequencyInfo.bus_to_dec_rate_den =
   68     gPEClockFrequencyInfo.bus_clock_rate_hz / gPEClockFrequencyInfo.dec_clock_rate_hz;
   69 }

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