diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/psim/clock/clock.c')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/psim/clock/clock.c | 242 |
1 files changed, 30 insertions, 212 deletions
diff --git a/c/src/lib/libbsp/powerpc/psim/clock/clock.c b/c/src/lib/libbsp/powerpc/psim/clock/clock.c index 8ac1b2bd77..4367e0d0a1 100644 --- a/c/src/lib/libbsp/powerpc/psim/clock/clock.c +++ b/c/src/lib/libbsp/powerpc/psim/clock/clock.c @@ -1,233 +1,51 @@ /* - * Clock Tick Device Driver - * - * This routine utilizes the Decrementer Register common to the PPC family. - * - * The tick frequency is directly programmed to the configured number of - * microseconds per tick. - * - * COPYRIGHT (c) 1989-1999. - * On-Line Applications Research Corporation (OAR). - * - * The license and distribution terms for this file may be - * found in found in the file LICENSE in this distribution or at - * http://www.OARcorp.com/rtems/license.html. + * Instantiate the clock driver shell for psim based + * on the decrementer register. * * $Id$ */ -#include <stdlib.h> - -#include <bsp.h> -#include <rtems/libio.h> +#include <rtems.h> /* - * The Real Time Clock Counter Timer uses this trap type. + * If defined, speed up the clock ticks while the idle task is running so + * time spent in the idle task is minimized. This significantly reduces + * the wall time required to execute the RTEMS test suites. */ -#define CLOCK_VECTOR PPC_IRQ_DECREMENTER - -/* - * Clock ticks since initialization - */ +#define CLOCK_DRIVER_USE_FAST_IDLE -volatile rtems_unsigned32 Clock_driver_ticks; +#define CLOCK_VECTOR PPC_IRQ_DECREMENTER -/* - * This is the value programmed into the count down timer. It - * is artificially lowered when PSIM_FAST_IDLE is defined to - * cut down how long we spend in the idle task while executing on - * the simulator. +/* On psim, each click of the decrementer register corresponds + * to 1 instruction. By setting this to 100, we are indicating + * that we are assuming it can execute 100 instructions per + * microsecond. This corresponds to sustaining 1 instruction + * per cycle at 100 Mhz. Whether this is a good guess or not + * is anyone's guess. */ -extern rtems_unsigned32 CPU_PPC_CLICKS_PER_TICK; - -rtems_isr_entry Old_ticker; +extern int PSIM_INSTRUCTIONS_PER_MICROSECOND; -void Clock_exit( void ); - -/* - * These are set by clock driver during its init - */ - -rtems_device_major_number rtems_clock_major = ~0; -rtems_device_minor_number rtems_clock_minor; +unsigned int PPC_DECREMENTER_CLICKS; -/* - * Clock_isr - * - * This is the clock tick interrupt handler. - * - * Input parameters: - * vector - vector number - * - * Output parameters: NONE - * - * Return values: NONE - * - */ +#define Clock_driver_support_install_isr( _new, _old ) \ + do { \ + _old = (rtems_isr_entry) set_vector( _new, CLOCK_VECTOR, 1 ); \ + PPC_DECREMENTER_CLICKS = (unsigned int)&PSIM_INSTRUCTIONS_PER_MICROSECOND; \ + PPC_DECREMENTER_CLICKS *= rtems_configuration_get_microseconds_per_tick(); \ + PPC_DECREMENTER_CLICKS = 1000; \ + } while(0) -#define PPC_Set_decrementer( _clicks ) \ +#define Clock_driver_support_initialize_hardware() \ do { \ - asm volatile( "mtdec %0" : "=r" ((_clicks)) : "r" ((_clicks)) ); \ + unsigned int _clicks = PPC_DECREMENTER_CLICKS; \ + PPC_Set_decrementer( _clicks ); \ } while (0) -rtems_isr Clock_isr( - rtems_vector_number vector -) -{ - /* - * Whether or not we we are in "fast idle" mode, the value for clicks - * per tick must be programmed. If we are using "fast idle" mode for - * a simulator, then the clicks per tick value is lowered to decrease - * the amount of time spent executing the idle task while using the - * an instruction simulator like psim. - */ - - - PPC_Set_decrementer( CPU_PPC_CLICKS_PER_TICK ); +#define Clock_driver_support_at_tick() \ + Clock_driver_support_initialize_hardware() - /* - * The driver has seen another tick. - */ - - Clock_driver_ticks += 1; - - /* - * Real Time Clock counter/timer is set to automatically reload. - */ - - rtems_clock_tick(); -} - -/* - * Install_clock - * - * This routine actually performs the hardware initialization for the clock. - * - * Input parameters: - * clock_isr - clock interrupt service routine entry point - * - * Output parameters: NONE - * - * Return values: NONE - * - */ - -extern int CLOCK_SPEED; - -void Install_clock( - rtems_isr_entry clock_isr -) -{ - Clock_driver_ticks = 0; - - Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); - - PPC_Set_decrementer( CPU_PPC_CLICKS_PER_TICK ); - - atexit( Clock_exit ); -} - -/* - * Clock_exit - * - * This routine allows the clock driver to exit by masking the interrupt and - * disabling the clock's counter. - * - * Input parameters: NONE - * - * Output parameters: NONE - * - * Return values: NONE - * - */ - -void Clock_exit( void ) -{ - /* nothing to do */; - - /* do not restore old vector */ -} - -/* - * Clock_initialize - * - * This routine initializes the clock driver. - * - * Input parameters: - * major - clock device major number - * minor - clock device minor number - * parg - pointer to optional device driver arguments - * - * Output parameters: NONE - * - * Return values: - * rtems_device_driver status code - */ - -rtems_device_driver Clock_initialize( - rtems_device_major_number major, - rtems_device_minor_number minor, - void *pargp -) -{ - Install_clock( Clock_isr ); - - /* - * make major/minor avail to others such as shared memory driver - */ - - rtems_clock_major = major; - rtems_clock_minor = minor; - - return RTEMS_SUCCESSFUL; -} - -/* - * Clock_control - * - * This routine is the clock device driver control entry point. - * - * Input parameters: - * major - clock device major number - * minor - clock device minor number - * parg - pointer to optional device driver arguments - * - * Output parameters: NONE - * - * Return values: - * rtems_device_driver status code - */ +#define Clock_driver_support_shutdown_hardware() -rtems_device_driver Clock_control( - rtems_device_major_number major, - rtems_device_minor_number minor, - void *pargp -) -{ - rtems_unsigned32 isrlevel; - rtems_libio_ioctl_args_t *args = pargp; - - if (args == 0) - goto done; - - /* - * This is hokey, but until we get a defined interface - * to do this, it will just be this simple... - */ - - if (args->command == rtems_build_name('I', 'S', 'R', ' ')) - { - Clock_isr(CLOCK_VECTOR); - } - else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) - { - rtems_interrupt_disable( isrlevel ); - (void) set_vector( args->buffer, CLOCK_VECTOR, 1 ); - rtems_interrupt_enable( isrlevel ); - } - -done: - return RTEMS_SUCCESSFUL; -} +#include "../../../shared/clockdrv_shell.c" |