diff options
Diffstat (limited to 'c/src/lib/libcpu/mips/timer/timer.c')
| -rw-r--r-- | c/src/lib/libcpu/mips/timer/timer.c | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/c/src/lib/libcpu/mips/timer/timer.c b/c/src/lib/libcpu/mips/timer/timer.c deleted file mode 100644 index 4e3cfb06b0..0000000000 --- a/c/src/lib/libcpu/mips/timer/timer.c +++ /dev/null @@ -1,136 +0,0 @@ -/* timer.c - * - * This file contains the initialization code for the IDT 4650 timer driver. - * - * Author: Craig Lebakken <craigl@transition.com> - * - * COPYRIGHT (c) 1996 by Transition Networks Inc. - * - * To anyone who acknowledges that this file is provided "AS IS" - * without any express or implied warranty: - * permission to use, copy, modify, and distribute this file - * for any purpose is hereby granted without fee, provided that - * the above copyright notice and this notice appears in all - * copies, and that the name of Transition Networks not be used in - * advertising or publicity pertaining to distribution of the - * software without specific, written prior permission. - * Transition Networks makes no representations about the suitability - * of this software for any purpose. - * - * derived from src/lib/libbsp/no_cpu/no_bsp/timer/timer.c - * - * This file manages the benchmark timer used by the RTEMS Timing Test - * Suite. Each measured time period is demarcated by calls to - * Timer_initialize() and Read_timer(). Read_timer() usually returns - * the number of microseconds since Timer_initialize() exitted. - * - * NOTE: It is important that the timer start/stop overhead be - * determined when porting or modifying this code. - * - * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. - * On-Line Applications Research Corporation (OAR). - * All rights assigned to U.S. Government, 1994. - * - * This material may be reproduced by or for the U.S. Government pursuant - * to the copyright license under the clause at DFARS 252.227-7013. This - * notice must appear in all copies of this file and its derivatives. - * - * $Id$ - */ - -#ifndef lint -static char _sccsid[] = "@(#)timer.c 08/20/96 1.5\n"; -#endif - -#include <rtems.h> -#include <bsp.h> - -#define CLOCKS_PER_MICROSECOND ( CPU_CLOCK_RATE_MHZ ) -#define TIMER_MAX_VALUE 0xffffffff - -extern unsigned32 mips_read_timer( void ); - -static rtems_boolean Timer_driver_Find_average_overhead; -static unsigned32 Timer_initial_value = 0; - -void Timer_initialize( void ) -{ - Timer_initial_value = mips_read_timer(); - /* - * Somehow start the timer - */ - - /* Timer on 4650 is always running */ -} - -/* - * The following controls the behavior of Read_timer(). - * - * AVG_OVEREHAD is the overhead for starting and stopping the timer. It - * is usually deducted from the number returned. - * - * LEAST_VALID is the lowest number this routine should trust. Numbers - * below this are "noise" and zero is returned. - */ - -#define AVG_OVERHEAD 8 /* It typically takes X.X microseconds */ - /* (Y countdowns) to start/stop the timer. */ - /* This value is in cycles. */ -#define LEAST_VALID 1 /* Don't trust a clicks value lower than this */ - -int Read_timer( void ) -{ - unsigned64 clicks; - unsigned32 total; - - /* - * Read the timer and see how many clicks it has been since we started. - */ - - clicks = mips_read_timer(); /* XXX: read some HW here */ - if (clicks < Timer_initial_value) - { - clicks += TIMER_MAX_VALUE; - } - clicks -= Timer_initial_value; - - /* - * Total is calculated by taking into account the number of timer overflow - * interrupts since the timer was initialized and clicks since the last - * interrupts. - */ -#if 0 /* leave total in number of cycles */ - total = clicks / CLOCKS_PER_MICROSECOND; -#else - total = clicks; -#endif - - if ( Timer_driver_Find_average_overhead == 1 ) - return total; /* in # cycles units */ - else { - if ( total < LEAST_VALID ) - return 0; /* below timer resolution */ - /* - * leave total in cycles - */ - return (total - AVG_OVERHEAD); - } -} - -/* - * Empty function call used in loops to measure basic cost of looping - * in Timing Test Suite. - */ - -rtems_status_code Empty_function( void ) -{ - return RTEMS_SUCCESSFUL; -} - -void Set_find_average_overhead( - rtems_boolean find_flag -) -{ - Timer_driver_Find_average_overhead = find_flag; -} - |