projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 8ad349bb | 4 | * @APPLE_LICENSE_OSREFERENCE_HEADER_START@ |
| 1c79356b | 5 | * |
| 8ad349bb A |
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 | |
| 10 | * License may not be used to create, or enable the creation or | |
| 11 | * redistribution of, unlawful or unlicensed copies of an Apple operating | |
| 12 | * system, or to circumvent, violate, or enable the circumvention or | |
| 13 | * violation of, any terms of an Apple operating system software license | |
| 14 | * agreement. | |
| 15 | * | |
| 16 | * Please obtain a copy of the License at | |
| 17 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 18 | * file. | |
| 19 | * | |
| 20 | * The Original Code and all software distributed under the License are | |
| 21 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 22 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 23 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 24 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 25 | * Please see the License for the specific language governing rights and | |
| 26 | * limitations under the License. | |
| 27 | * | |
| 28 | * @APPLE_LICENSE_OSREFERENCE_HEADER_END@ | |
| 1c79356b A |
29 | */ |
| 30 | #include <pexpert/pexpert.h> | |
| 31 | #include <pexpert/protos.h> | |
| 32 | #include <pexpert/device_tree.h> | |
| 33 | ||
| 34 | /* Local declarations */ | |
| 35 | void pe_identify_machine(boot_args *args); | |
| 36 | ||
| 37 | /* pe_identify_machine: | |
| 38 | * | |
| 39 | * Sets up platform parameters. | |
| 40 | * Returns: nothing | |
| 41 | */ | |
| 91447636 | 42 | void pe_identify_machine(__unused boot_args *args) |
| 1c79356b A |
43 | { |
| 44 | // Clear the gPEClockFrequencyInfo struct | |
| 45 | bzero((void *)&gPEClockFrequencyInfo, sizeof(clock_frequency_info_t)); | |
| 46 | ||
| 47 | // Start with default values. | |
| 91447636 A |
48 | gPEClockFrequencyInfo.timebase_frequency_hz = 1000000000; |
| 49 | gPEClockFrequencyInfo.bus_frequency_hz = 100000000; | |
| 50 | gPEClockFrequencyInfo.cpu_frequency_hz = 300000000; | |
| 43866e37 A |
51 | |
| 52 | gPEClockFrequencyInfo.bus_frequency_min_hz = gPEClockFrequencyInfo.bus_frequency_hz; | |
| 53 | gPEClockFrequencyInfo.bus_frequency_max_hz = gPEClockFrequencyInfo.bus_frequency_hz; | |
| 54 | gPEClockFrequencyInfo.cpu_frequency_min_hz = gPEClockFrequencyInfo.cpu_frequency_hz; | |
| 55 | gPEClockFrequencyInfo.cpu_frequency_max_hz = gPEClockFrequencyInfo.cpu_frequency_hz; | |
| 56 | ||
| 57 | gPEClockFrequencyInfo.dec_clock_rate_hz = gPEClockFrequencyInfo.timebase_frequency_hz; | |
| 58 | gPEClockFrequencyInfo.bus_clock_rate_hz = gPEClockFrequencyInfo.bus_frequency_hz; | |
| 59 | gPEClockFrequencyInfo.cpu_clock_rate_hz = gPEClockFrequencyInfo.cpu_frequency_hz; | |
| 1c79356b A |
60 | |
| 61 | // Get real number from some where. | |
| 62 | ||
| 63 | // Set the num / den pairs form the hz values. | |
| 64 | gPEClockFrequencyInfo.bus_clock_rate_num = gPEClockFrequencyInfo.bus_clock_rate_hz; | |
| 65 | gPEClockFrequencyInfo.bus_clock_rate_den = 1; | |
| 66 | ||
| 67 | gPEClockFrequencyInfo.bus_to_cpu_rate_num = | |
| 68 | (2 * gPEClockFrequencyInfo.cpu_clock_rate_hz) / gPEClockFrequencyInfo.bus_clock_rate_hz; | |
| 69 | gPEClockFrequencyInfo.bus_to_cpu_rate_den = 2; | |
| 70 | ||
| 71 | gPEClockFrequencyInfo.bus_to_dec_rate_num = 1; | |
| 72 | gPEClockFrequencyInfo.bus_to_dec_rate_den = | |
| 73 | gPEClockFrequencyInfo.bus_clock_rate_hz / gPEClockFrequencyInfo.dec_clock_rate_hz; | |
| 74 | } |