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