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 <machine/machine_routines.h>
29#include <pexpert/pexpert.h>
30#include <pexpert/protos.h>
31
32/* Local declarations */
33void pe_identify_machine(boot_args *args);
34
35/* pe_identify_machine:
36 *
37 *   Sets up platform parameters.
38 *   Returns:    nothing
39 */
40void 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}
73