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https://opencores.org/ocsvn/openrisc/openrisc/trunk
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- This comparison shows the changes necessary to convert path
/openrisc/trunk/rtos/rtems/c/src/lib/libbsp/i386/ts_386ex/timer
- from Rev 30 to Rev 173
- ↔ Reverse comparison
Rev 30 → Rev 173
/timerisr.S
0,0 → 1,39
/* timer_isr() |
* |
* This routine provides the ISR for the Z8036 timer on the MVME136 |
* board. The timer is set up to generate an interrupt at maximum |
* intervals. |
* |
* Input parameters: NONE |
* |
* Output parameters: NONE |
* |
* 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.OARcorp.com/rtems/license.html. |
* |
* $Id: timerisr.S,v 1.2 2001-09-27 11:59:50 chris Exp $ |
*/ |
|
#include "asm.h" |
|
BEGIN_CODE |
|
EXTERN (Ttimer_val) |
|
PUBLIC (timerisr) |
SYM (timerisr): |
incl SYM (Ttimer_val) # add another tick |
pushl eax |
movb 0xa0,al /* signal generic End Of Interrupt (EOI) to slave PIC */ |
outb al, $0x20 |
movb $0x20, al |
outb al, $0x20 /* signal generic EOI to Master PIC */ |
popl eax |
iret |
|
END_CODE |
END |
/timer.c
0,0 → 1,194
/* Timer_init() |
* |
* This routine initializes the timer on the FORCE CPU-386 board. |
* |
* Input parameters: NONE |
* |
* Output parameters: NONE |
* |
* NOTE: This routine will not work if the optimizer is enabled |
* for some compilers. The multiple writes to the Z8036 |
* may be optimized away. |
* |
* 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.OARcorp.com/rtems/license.html. |
* |
* $Id: timer.c,v 1.2 2001-09-27 11:59:50 chris Exp $ |
*/ |
|
|
#include <rtems.h> |
#include <bsp.h> |
#include <stdlib.h> |
|
volatile rtems_unsigned32 Ttimer_val; /* Updated from ISR!!! */ |
rtems_boolean Timer_driver_Find_average_overhead; |
|
extern void timerisr(); |
|
/* |
* 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() |
{ |
if (!i386_delete_idt_entry(&timer_raw_irq_data)) { |
printk("Timer_exit:Timer raw handler removal failed\n"); |
rtems_fatal_error_occurred(1); |
} |
} |
|
void Timer_initialize(void) |
{ |
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static rtems_boolean First = TRUE; |
|
if (First) |
{ |
First = FALSE; |
|
if (!i386_get_current_idt_entry (&old_raw_irq_data)) { |
printk("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("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("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 */ |
|
int Read_timer(void) |
{ |
register rtems_unsigned32 clicks, total; |
register rtems_unsigned8 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 ( Timer_driver_Find_average_overhead == 1 ) |
return total; /* in one microsecond units */ |
else if ( total < LEAST_VALID ) |
return 0; /* below timer resolution */ |
else |
return (total - AVG_OVERHEAD); |
} |
|
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; |
} |
|
/* |
* 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); |
} |
/Makefile.am
0,0 → 1,33
## |
## $Id: Makefile.am,v 1.2 2001-09-27 11:59:50 chris Exp $ |
## |
|
AUTOMAKE_OPTIONS = foreign 1.4 |
|
PGM = $(ARCH)/timer.rel |
|
## sources |
C_FILES = timer.c |
S_FILES = timerisr.S |
timer_rel_OBJECTS = $(C_FILES:%.c=$(ARCH)/%.o) $(S_FILES:%.S=$(ARCH)/%.o) |
|
include $(RTEMS_ROOT)/make/custom/@RTEMS_BSP@.cfg |
include $(top_srcdir)/../../../../../../automake/lib.am |
|
# |
# (OPTIONAL) Add local stuff here using += |
# |
|
$(PGM): $(timer_rel_OBJECTS) |
$(make-rel) |
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# the .rel file built here will be put into libbsp.a by |
# ../wrapup/Makefile |
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all-local: $(ARCH) $(timer_rel_OBJECTS) $(PGM) |
|
.PRECIOUS: $(PGM) |
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EXTRA_DIST = timer.c timerisr.S |
|
include $(top_srcdir)/../../../../../../automake/local.am |