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Diffstat (limited to '')
-rw-r--r-- | c/src/lib/libbsp/c4x/c4xsim/timer/timer.c | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/c/src/lib/libbsp/c4x/c4xsim/timer/timer.c b/c/src/lib/libbsp/c4x/c4xsim/timer/timer.c deleted file mode 100644 index 8b61bfb6d3..0000000000 --- a/c/src/lib/libbsp/c4x/c4xsim/timer/timer.c +++ /dev/null @@ -1,105 +0,0 @@ -/* timer.c - * - * This file manages the benchmark timer used by the RTEMS Timing Test - * Suite. Each measured time period is demarcated by calls to - * benchmark_timer_initialize() and benchmark_timer_read(). benchmark_timer_read() usually returns - * the number of microseconds since benchmark_timer_initialize() exitted. - * - * NOTE: It is important that the timer start/stop overhead be - * determined when porting or modifying this code. - * - * COPYRIGHT (c) 1989-1999. - * On-Line Applications Research Corporation (OAR). - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.com/license/LICENSE. - * - * $Id$ - */ - -#include <rtems.h> -#include <bsp.h> -#include <rtems/tic4x/c4xio.h> - -uint32_t Timer_interrupts; -bool benchmark_timer_find_average_overhead; - -static uint32_t start; - -void benchmark_timer_initialize( void ) -{ - - /* - * Timer has never overflowed. This may not be necessary on some - * implemenations of timer but .... - */ - - c4x_timer_stop(C4X_TIMER_0); - c4x_timer_set_period(C4X_TIMER_0, 0xffffffff); /* so no interupts */ - c4x_timer_start(C4X_TIMER_0); - start = c4x_timer_get_counter(C4X_TIMER_0); - - Timer_interrupts = 0; - - /* - * Somehow start the timer - */ -} - -/* - * The following controls the behavior of benchmark_timer_read(). - * - * 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 0 /* It typically takes X.X microseconds */ - /* (Y countdowns) to start/stop the timer. */ - /* This value is in microseconds. */ -#define LEAST_VALID 1 /* Don't trust a clicks value lower than this */ - -int benchmark_timer_read( void ) -{ - uint32_t clicks; - uint32_t total; - int tmp; - - /* - * Read the timer and see how many clicks it has been since we started. - */ - - clicks = c4x_timer_get_counter(C4X_TIMER_0); - clicks -= start; - - /* - * Total is calculated by taking into account the number of timer overflow - * interrupts since the timer was initialized and clicks since the last - * interrupts. - */ - - total = clicks * 1; - - if ( benchmark_timer_find_average_overhead == true ) { - return total; /* in count units where each count is */ - /* 1 / (clock frequency/2) */ - } else { - if ( total < LEAST_VALID ) - return 0; /* below timer resolution */ - /* - * Somehow convert total into microseconds - */ - tmp = (int) ((float) total * ((1.0 / 25.0))); - return (tmp - AVG_OVERHEAD); - } -} - -void benchmark_timer_disable_subtracting_average_overhead( - bool find_flag -) -{ - benchmark_timer_find_average_overhead = find_flag; -} |