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dolphin/Externals/polarssl/library/timing.c

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/*
* Portable interface to the CPU cycle counter
*
* Copyright (C) 2006-2014, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#if defined(POLARSSL_SELF_TEST) && defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#include <stdio.h>
#define polarssl_printf printf
#endif
#if defined(POLARSSL_TIMING_C) && !defined(POLARSSL_TIMING_ALT)
#include "polarssl/timing.h"
#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
#include <windows.h>
#include <winbase.h>
struct _hr_time
{
LARGE_INTEGER start;
};
#else
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <signal.h>
#include <time.h>
struct _hr_time
{
struct timeval start;
};
#endif /* _WIN32 && !EFIX64 && !EFI32 */
#if !defined(POLARSSL_HAVE_HARDCLOCK) && defined(POLARSSL_HAVE_ASM) && \
( defined(_MSC_VER) && defined(_M_IX86) ) || defined(__WATCOMC__)
#define POLARSSL_HAVE_HARDCLOCK
unsigned long hardclock( void )
{
unsigned long tsc;
__asm rdtsc
__asm mov [tsc], eax
return( tsc );
}
#endif /* !POLARSSL_HAVE_HARDCLOCK && POLARSSL_HAVE_ASM &&
( _MSC_VER && _M_IX86 ) || __WATCOMC__ */
#if !defined(POLARSSL_HAVE_HARDCLOCK) && defined(POLARSSL_HAVE_ASM) && \
defined(__GNUC__) && defined(__i386__)
#define POLARSSL_HAVE_HARDCLOCK
unsigned long hardclock( void )
{
unsigned long lo, hi;
asm volatile( "rdtsc" : "=a" (lo), "=d" (hi) );
return( lo );
}
#endif /* !POLARSSL_HAVE_HARDCLOCK && POLARSSL_HAVE_ASM &&
__GNUC__ && __i386__ */
#if !defined(POLARSSL_HAVE_HARDCLOCK) && defined(POLARSSL_HAVE_ASM) && \
defined(__GNUC__) && ( defined(__amd64__) || defined(__x86_64__) )
#define POLARSSL_HAVE_HARDCLOCK
unsigned long hardclock( void )
{
unsigned long lo, hi;
asm volatile( "rdtsc" : "=a" (lo), "=d" (hi) );
return( lo | ( hi << 32 ) );
}
#endif /* !POLARSSL_HAVE_HARDCLOCK && POLARSSL_HAVE_ASM &&
__GNUC__ && ( __amd64__ || __x86_64__ ) */
#if !defined(POLARSSL_HAVE_HARDCLOCK) && defined(POLARSSL_HAVE_ASM) && \
defined(__GNUC__) && ( defined(__powerpc__) || defined(__ppc__) )
#define POLARSSL_HAVE_HARDCLOCK
unsigned long hardclock( void )
{
unsigned long tbl, tbu0, tbu1;
do
{
asm volatile( "mftbu %0" : "=r" (tbu0) );
asm volatile( "mftb %0" : "=r" (tbl ) );
asm volatile( "mftbu %0" : "=r" (tbu1) );
}
while( tbu0 != tbu1 );
return( tbl );
}
#endif /* !POLARSSL_HAVE_HARDCLOCK && POLARSSL_HAVE_ASM &&
__GNUC__ && ( __powerpc__ || __ppc__ ) */
#if !defined(POLARSSL_HAVE_HARDCLOCK) && defined(POLARSSL_HAVE_ASM) && \
defined(__GNUC__) && defined(__sparc64__)
#if defined(__OpenBSD__)
#warning OpenBSD does not allow access to tick register using software version instead
#else
#define POLARSSL_HAVE_HARDCLOCK
unsigned long hardclock( void )
{
unsigned long tick;
asm volatile( "rdpr %%tick, %0;" : "=&r" (tick) );
return( tick );
}
#endif /* __OpenBSD__ */
#endif /* !POLARSSL_HAVE_HARDCLOCK && POLARSSL_HAVE_ASM &&
__GNUC__ && __sparc64__ */
#if !defined(POLARSSL_HAVE_HARDCLOCK) && defined(POLARSSL_HAVE_ASM) && \
defined(__GNUC__) && defined(__sparc__) && !defined(__sparc64__)
#define POLARSSL_HAVE_HARDCLOCK
unsigned long hardclock( void )
{
unsigned long tick;
asm volatile( ".byte 0x83, 0x41, 0x00, 0x00" );
asm volatile( "mov %%g1, %0" : "=r" (tick) );
return( tick );
}
#endif /* !POLARSSL_HAVE_HARDCLOCK && POLARSSL_HAVE_ASM &&
__GNUC__ && __sparc__ && !__sparc64__ */
#if !defined(POLARSSL_HAVE_HARDCLOCK) && defined(POLARSSL_HAVE_ASM) && \
defined(__GNUC__) && defined(__alpha__)
#define POLARSSL_HAVE_HARDCLOCK
unsigned long hardclock( void )
{
unsigned long cc;
asm volatile( "rpcc %0" : "=r" (cc) );
return( cc & 0xFFFFFFFF );
}
#endif /* !POLARSSL_HAVE_HARDCLOCK && POLARSSL_HAVE_ASM &&
__GNUC__ && __alpha__ */
#if !defined(POLARSSL_HAVE_HARDCLOCK) && defined(POLARSSL_HAVE_ASM) && \
defined(__GNUC__) && defined(__ia64__)
#define POLARSSL_HAVE_HARDCLOCK
unsigned long hardclock( void )
{
unsigned long itc;
asm volatile( "mov %0 = ar.itc" : "=r" (itc) );
return( itc );
}
#endif /* !POLARSSL_HAVE_HARDCLOCK && POLARSSL_HAVE_ASM &&
__GNUC__ && __ia64__ */
#if !defined(POLARSSL_HAVE_HARDCLOCK) && defined(_MSC_VER) && \
!defined(EFIX64) && !defined(EFI32)
#define POLARSSL_HAVE_HARDCLOCK
unsigned long hardclock( void )
{
LARGE_INTEGER offset;
QueryPerformanceCounter( &offset );
return( (unsigned long)( offset.QuadPart ) );
}
#endif /* !POLARSSL_HAVE_HARDCLOCK && _MSC_VER && !EFIX64 && !EFI32 */
#if !defined(POLARSSL_HAVE_HARDCLOCK)
#define POLARSSL_HAVE_HARDCLOCK
static int hardclock_init = 0;
static struct timeval tv_init;
unsigned long hardclock( void )
{
struct timeval tv_cur;
if( hardclock_init == 0 )
{
gettimeofday( &tv_init, NULL );
hardclock_init = 1;
}
gettimeofday( &tv_cur, NULL );
return( ( tv_cur.tv_sec - tv_init.tv_sec ) * 1000000
+ ( tv_cur.tv_usec - tv_init.tv_usec ) );
}
#endif /* !POLARSSL_HAVE_HARDCLOCK */
volatile int alarmed = 0;
#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
unsigned long get_timer( struct hr_time *val, int reset )
{
unsigned long delta;
LARGE_INTEGER offset, hfreq;
struct _hr_time *t = (struct _hr_time *) val;
QueryPerformanceCounter( &offset );
QueryPerformanceFrequency( &hfreq );
delta = (unsigned long)( ( 1000 *
( offset.QuadPart - t->start.QuadPart ) ) /
hfreq.QuadPart );
if( reset )
QueryPerformanceCounter( &t->start );
return( delta );
}
DWORD WINAPI TimerProc( LPVOID uElapse )
{
Sleep( (DWORD) uElapse );
alarmed = 1;
return( TRUE );
}
void set_alarm( int seconds )
{
DWORD ThreadId;
alarmed = 0;
CloseHandle( CreateThread( NULL, 0, TimerProc,
(LPVOID) ( seconds * 1000 ), 0, &ThreadId ) );
}
void m_sleep( int milliseconds )
{
Sleep( milliseconds );
}
#else /* _WIN32 && !EFIX64 && !EFI32 */
unsigned long get_timer( struct hr_time *val, int reset )
{
unsigned long delta;
struct timeval offset;
struct _hr_time *t = (struct _hr_time *) val;
gettimeofday( &offset, NULL );
delta = ( offset.tv_sec - t->start.tv_sec ) * 1000
+ ( offset.tv_usec - t->start.tv_usec ) / 1000;
if( reset )
{
t->start.tv_sec = offset.tv_sec;
t->start.tv_usec = offset.tv_usec;
}
return( delta );
}
#if defined(INTEGRITY)
void m_sleep( int milliseconds )
{
usleep( milliseconds * 1000 );
}
#else /* INTEGRITY */
static void sighandler( int signum )
{
alarmed = 1;
signal( signum, sighandler );
}
void set_alarm( int seconds )
{
alarmed = 0;
signal( SIGALRM, sighandler );
alarm( seconds );
}
void m_sleep( int milliseconds )
{
struct timeval tv;
tv.tv_sec = milliseconds / 1000;
tv.tv_usec = ( milliseconds % 1000 ) * 1000;
select( 0, NULL, NULL, NULL, &tv );
}
#endif /* INTEGRITY */
#endif /* _WIN32 && !EFIX64 && !EFI32 */
#if defined(POLARSSL_SELF_TEST)
/* To test net_usleep against our functions */
#if defined(POLARSSL_NET_C)
#include "polarssl/net.h"
#endif
/*
* Busy-waits for the given number of milliseconds.
* Used for testing hardclock.
*/
static void busy_msleep( unsigned long msec )
{
struct hr_time hires;
unsigned long i = 0; /* for busy-waiting */
volatile unsigned long j; /* to prevent optimisation */
(void) get_timer( &hires, 1 );
while( get_timer( &hires, 0 ) < msec )
i++;
j = i;
(void) j;
}
/*
* Checkup routine
*
* Warning: this is work in progress, some tests may not be reliable enough
* yet! False positives may happen.
*/
int timing_self_test( int verbose )
{
unsigned long cycles, ratio;
unsigned long millisecs, secs;
int hardfail;
struct hr_time hires;
if( verbose != 0 )
polarssl_printf( " TIMING tests note: will take some time!\n" );
if( verbose != 0 )
polarssl_printf( " TIMING test #1 (m_sleep / get_timer): " );
for( secs = 1; secs <= 3; secs++ )
{
(void) get_timer( &hires, 1 );
m_sleep( 500 * secs );
millisecs = get_timer( &hires, 0 );
if( millisecs < 450 * secs || millisecs > 550 * secs )
{
if( verbose != 0 )
polarssl_printf( "failed\n" );
return( 1 );
}
}
if( verbose != 0 )
polarssl_printf( "passed\n" );
if( verbose != 0 )
polarssl_printf( " TIMING test #2 (set_alarm / get_timer): " );
for( secs = 1; secs <= 3; secs++ )
{
(void) get_timer( &hires, 1 );
set_alarm( secs );
while( !alarmed )
;
millisecs = get_timer( &hires, 0 );
if( millisecs < 900 * secs || millisecs > 1100 * secs )
{
if( verbose != 0 )
polarssl_printf( "failed\n" );
return( 1 );
}
}
if( verbose != 0 )
polarssl_printf( "passed\n" );
if( verbose != 0 )
polarssl_printf( " TIMING test #3 (hardclock / get_timer): " );
/*
* Allow one failure for possible counter wrapping.
* On a 4Ghz 32-bit machine the cycle counter wraps about once per second;
* since the whole test is about 10ms, it shouldn't happen twice in a row.
*/
hardfail = 0;
hard_test:
if( hardfail > 1 )
{
if( verbose != 0 )
polarssl_printf( "failed\n" );
return( 1 );
}
/* Get a reference ratio cycles/ms */
millisecs = 1;
cycles = hardclock();
busy_msleep( millisecs );
cycles = hardclock() - cycles;
ratio = cycles / millisecs;
/* Check that the ratio is mostly constant */
for( millisecs = 2; millisecs <= 4; millisecs++ )
{
cycles = hardclock();
busy_msleep( millisecs );
cycles = hardclock() - cycles;
/* Allow variation up to 20% */
if( cycles / millisecs < ratio - ratio / 5 ||
cycles / millisecs > ratio + ratio / 5 )
{
hardfail++;
goto hard_test;
}
}
if( verbose != 0 )
polarssl_printf( "passed\n" );
#if defined(POLARSSL_NET_C)
if( verbose != 0 )
polarssl_printf( " TIMING test #4 (net_usleep/ get_timer): " );
for( secs = 1; secs <= 3; secs++ )
{
(void) get_timer( &hires, 1 );
net_usleep( 500000 * secs );
millisecs = get_timer( &hires, 0 );
if( millisecs < 450 * secs || millisecs > 550 * secs )
{
if( verbose != 0 )
polarssl_printf( "failed\n" );
return( 1 );
}
}
if( verbose != 0 )
polarssl_printf( "passed\n" );
#endif /* POLARSSL_NET_C */
if( verbose != 0 )
polarssl_printf( "\n" );
return( 0 );
}
#endif /* POLARSSL_SELF_TEST */
#endif /* POLARSSL_TIMING_C && !POLARSSL_TIMING_ALT */
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