1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/**
* @file i386/timer.c
* i386 specific timer routines
*/
#include <libpayload.h>
#include <arch/rdtsc.h>
/**
* @ingroup arch
* Global variable containing the speed of the processor in KHz.
*/
u32 cpu_khz;
/**
* Calculate the speed of the processor for use in delays.
*
* @return The CPU speed in kHz.
*/
unsigned int get_cpu_speed(void)
{
unsigned long long start, end;
const uint32_t clock_rate = 1193182; // 1.193182 MHz
const uint16_t interval = (2 * clock_rate) / 1000; // 2 ms
/* Set up the PPC port - disable the speaker, enable the T2 gate. */
outb((inb(0x61) & ~0x02) | 0x01, 0x61);
/* Set the PIT to Mode 0, counter 2, word access. */
outb(0xB0, 0x43);
/* Load the interval into the counter. */
outb(interval & 0xff, 0x42);
outb((interval >> 8) & 0xff, 0x42);
/* Read the number of ticks during the period. */
start = rdtsc();
while (!(inb(0x61) & 0x20)) ;
end = rdtsc();
/*
* The number of milliseconds for a period is
* clock_rate / (interval * 1000). Multiply that by the number of
* measured clocks to get the kHz value.
*/
cpu_khz = (end - start) * clock_rate / (1000 * interval);
return cpu_khz;
}
static inline void _delay(unsigned long long delta)
{
unsigned long long timeout = rdtsc() + delta;
while (rdtsc() < timeout) ;
}
/**
* Delay for a specified number of nanoseconds.
*
* @param n Number of nanoseconds to delay for.
*/
void ndelay(unsigned int n)
{
_delay((unsigned long long)n * cpu_khz / 1000000);
}
/**
* Delay for a specified number of microseconds.
*
* @param n Number of microseconds to delay for.
*/
void udelay(unsigned int n)
{
_delay((unsigned long long)n * cpu_khz / 1000);
}
/**
* Delay for a specified number of milliseconds.
*
* @param m Number of milliseconds to delay for.
*/
void mdelay(unsigned int m)
{
_delay((unsigned long long)m * cpu_khz);
}
/**
* Delay for a specified number of seconds.
*
* @param s Number of seconds to delay for.
*/
void delay(unsigned int s)
{
int i;
for (i=0; i<1000; i++)
_delay((unsigned long long)s * cpu_khz);
}
|
