pe_identify_machine.c   [plain text]

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#include <pexpert/pexpert.h>
#include <pexpert/protos.h>
#include <pexpert/device_tree.h>

/* Local declarations */
void pe_identify_machine(boot_args *args);

/* pe_identify_machine:
 *
 *   Sets up platform parameters.
 *   Returns:    nothing
 */
void pe_identify_machine(__unused boot_args *args)
{
  // Clear the gPEClockFrequencyInfo struct
  bzero((void *)&gPEClockFrequencyInfo, sizeof(clock_frequency_info_t));
  
  // Start with default values.
  gPEClockFrequencyInfo.timebase_frequency_hz = 1000000000;
  gPEClockFrequencyInfo.bus_frequency_hz      =  100000000;
  gPEClockFrequencyInfo.cpu_frequency_hz      =  300000000;
  
  gPEClockFrequencyInfo.bus_frequency_min_hz = gPEClockFrequencyInfo.bus_frequency_hz;
  gPEClockFrequencyInfo.bus_frequency_max_hz = gPEClockFrequencyInfo.bus_frequency_hz;
  gPEClockFrequencyInfo.cpu_frequency_min_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
  gPEClockFrequencyInfo.cpu_frequency_max_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
  
  gPEClockFrequencyInfo.dec_clock_rate_hz = gPEClockFrequencyInfo.timebase_frequency_hz;
  gPEClockFrequencyInfo.bus_clock_rate_hz = gPEClockFrequencyInfo.bus_frequency_hz;
  gPEClockFrequencyInfo.cpu_clock_rate_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
  
  // Get real number from some where.
  
  // Set the num / den pairs form the hz values.
  gPEClockFrequencyInfo.bus_clock_rate_num = gPEClockFrequencyInfo.bus_clock_rate_hz;
  gPEClockFrequencyInfo.bus_clock_rate_den = 1;
  
  gPEClockFrequencyInfo.bus_to_cpu_rate_num =
    (2 * gPEClockFrequencyInfo.cpu_clock_rate_hz) / gPEClockFrequencyInfo.bus_clock_rate_hz;
  gPEClockFrequencyInfo.bus_to_cpu_rate_den = 2;
  
  gPEClockFrequencyInfo.bus_to_dec_rate_num = 1;
  gPEClockFrequencyInfo.bus_to_dec_rate_den =
    gPEClockFrequencyInfo.bus_clock_rate_hz / gPEClockFrequencyInfo.dec_clock_rate_hz;
}