projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
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 | } |