diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/ts_386ex/timer/timer.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/ts_386ex/timer/timer.c | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/c/src/lib/libbsp/i386/ts_386ex/timer/timer.c b/c/src/lib/libbsp/i386/ts_386ex/timer/timer.c deleted file mode 100644 index be68f24185..0000000000 --- a/c/src/lib/libbsp/i386/ts_386ex/timer/timer.c +++ /dev/null @@ -1,174 +0,0 @@ -/* - * 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/btimer.h> -#include <stdlib.h> - -volatile uint32_t Ttimer_val; /* Updated from ISR!!! */ -bool benchmark_timer_find_average_overhead; - -extern void timerisr(void); - -/* - * Number of us per timer interrupt. Note: 1 us == 1 tick. - */ - -#define US_PER_ISR 250 - -void TimerOn(const rtems_raw_irq_connect_data* used) -{ - - Ttimer_val = 0; /* clear timer ISR count */ - - /* Select timer, stay in mode 0 */ - outport_byte (TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN); - - /* Set to 250 usec interval */ - outport_byte (TIMER_CNTR0, US_PER_ISR & 0xFF ); - outport_byte (TIMER_CNTR0, (US_PER_ISR >> 8) & 0xFF ); - - /* Enable all timers */ - outport_byte (TIMER_CONFIG, 0x00); - - /* - * enable interrrupt at i8259 level - */ - BSP_irq_enable_at_i8259s(used->idtIndex - BSP_IRQ_VECTOR_BASE); -} - -static int TimerIsOn (const rtems_raw_irq_connect_data *used) -{ - return BSP_irq_enabled_at_i8259s(used->idtIndex - BSP_IRQ_VECTOR_BASE); -} - -void TimerOff(const rtems_raw_irq_connect_data* used) -{ - /* Disable all timers */ - outport_byte (TIMER_CONFIG, 0x80); - - /* - * disable interrrupt at i8259 level - */ - BSP_irq_disable_at_i8259s(used->idtIndex - BSP_IRQ_VECTOR_BASE); - /* reset timer mode to standard (DOS) value */ -} - -static rtems_raw_irq_connect_data timer_raw_irq_data = { - BSP_PERIODIC_TIMER + BSP_IRQ_VECTOR_BASE, - timerisr, - TimerOn, - TimerOff, - TimerIsOn -}; - -static rtems_raw_irq_connect_data old_raw_irq_data = { - BSP_PERIODIC_TIMER + BSP_IRQ_VECTOR_BASE, -}; - -void Timer_exit(void) -{ - if (!i386_delete_idt_entry(&timer_raw_irq_data)) { - printk("Timer_exit:Timer raw handler removal failed\n"); - rtems_fatal_error_occurred(1); - } -} - -void benchmark_timer_initialize(void) -{ - - static bool First = true; - - if (First) - { - First = false; - - if (!i386_get_current_idt_entry (&old_raw_irq_data)) { - printk("benchmark_timer_initialize: failed to get old raw irq entry.\n"); - rtems_fatal_error_occurred(1); - } - - if (!i386_delete_idt_entry (&old_raw_irq_data)) { - printk("benchmark_timer_initialize: failed to delete old raw irq entry.\n"); - rtems_fatal_error_occurred(1); - } - - atexit(Timer_exit); /* Try not to hose the system at exit. */ - if (!i386_set_idt_entry (&timer_raw_irq_data)) { - printk("benchmark_timer_initialize: raw handler installation failed.\n"); - rtems_fatal_error_occurred(1); - } - } - - /* wait for ISR to be called at least once */ - Ttimer_val = 0; - while (Ttimer_val == 0) - continue; - Ttimer_val = 0; -} - -#define AVG_OVERHEAD 3 /* It typically takes 3.0 microseconds */ - /* (3 ticks) to start/stop the timer. */ -#define LEAST_VALID 4 /* Don't trust a value lower than this */ - -uint32_t benchmark_timer_read(void) -{ - register uint32_t clicks, total; - register uint8_t lsb, msb; - - /* latch the count */ - outport_byte (TIMER_MODE, TIMER_SEL0|TIMER_LATCH ); - - /* read the count */ - inport_byte (TIMER_CNTR0, lsb ); - inport_byte (TIMER_CNTR0, msb ); - - /* - * Timer ISR increments Ttimer_val every US_PER_ISR clock ticks, - * where 1 tick == 1 us. Below, 'click' is in microseconds. - * - * This assumes the timer input clocks are sourced from the system's - * prescaled clock (PSCLK), which is set to be at 1MHz. - */ - clicks = (msb << 8) | lsb; - total = Ttimer_val * US_PER_ISR + (US_PER_ISR - clicks); - - if ( benchmark_timer_find_average_overhead == true ) - return total; /* in one microsecond units */ - else if ( total < LEAST_VALID ) - return 0; /* below timer resolution */ - else - return (total - AVG_OVERHEAD); -} - -void benchmark_timer_disable_subtracting_average_overhead( - bool find_flag -) -{ - benchmark_timer_find_average_overhead = find_flag; -} - -/* - * Wait_X_ms: a delay loop used by the network driver... - */ - -#define SLOW_DOWN_IO 0x80 /* I/O port which does nothing */ -#define LOOP1MS 320 /* Just a guess.... */ - -void Wait_X_ms (unsigned timeToWait) -{ - unsigned i, j; - - for (j=0; j<timeToWait; j++) - for (i=0; i<LOOP1MS; i++) - outport_byte (SLOW_DOWN_IO, 0); -} |