diff options
Diffstat (limited to 'c/src/lib/libcpu/hppa1.1/clock/clock.c')
-rw-r--r-- | c/src/lib/libcpu/hppa1.1/clock/clock.c | 267 |
1 files changed, 0 insertions, 267 deletions
diff --git a/c/src/lib/libcpu/hppa1.1/clock/clock.c b/c/src/lib/libcpu/hppa1.1/clock/clock.c deleted file mode 100644 index 85ecabd263..0000000000 --- a/c/src/lib/libcpu/hppa1.1/clock/clock.c +++ /dev/null @@ -1,267 +0,0 @@ -/* Clock - * - * This routine initializes the interval timer on the - * PA-RISC CPU. The tick frequency is specified by the bsp. - * - * 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. - * - * $Id$ - */ - -#include <rtems.h> -#include <rtems/libio.h> - -/* should get this from bsp.h, but it is not installed yet */ -rtems_isr_entry set_vector(rtems_isr_entry, rtems_vector_number, int); -extern rtems_configuration_table BSP_Configuration; - -#include <stdlib.h> /* for atexit() */ - -extern rtems_cpu_table Cpu_table; /* owned by BSP */ - -typedef unsigned long long hppa_click_count_t; - -/* - * These are set by clock driver during its init - */ - -rtems_device_major_number rtems_clock_major = ~0; -rtems_device_minor_number rtems_clock_minor; - -/* - * CPU_HPPA_CLICKS_PER_TICK is either a #define or an rtems_unsigned32 - * allocated and set by bsp_start() - */ - -#ifndef CPU_HPPA_CLICKS_PER_TICK -extern rtems_unsigned32 CPU_HPPA_CLICKS_PER_TICK; -#endif - -volatile rtems_unsigned32 Clock_driver_ticks; -rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ - -rtems_unsigned32 most_recent_itimer_value; - -rtems_unsigned64 Clock_clicks; /* running total of cycles */ - -rtems_unsigned32 Clock_clicks_interrupt; - -void Clock_exit(void); - -void -ReInstall_clock(rtems_isr_entry new_clock_isr) -{ - rtems_unsigned32 isrlevel = 0; - - rtems_interrupt_disable(isrlevel); - (void) set_vector( - new_clock_isr, - HPPA_INTERRUPT_EXTERNAL_INTERVAL_TIMER, - 1 - ); - rtems_interrupt_enable(isrlevel); -} - -/* - * read itimer and update Clock_clicks as appropriate - */ - -rtems_unsigned32 -Clock_read_itimer() -{ - rtems_unsigned32 isrlevel; - rtems_unsigned32 itimer_value; - rtems_unsigned32 wrap_count; - rtems_unsigned32 recent_count; - - rtems_interrupt_disable(isrlevel); - - wrap_count = (Clock_clicks & 0xFFFFFFFF00000000ULL) >> 32; - recent_count = (rtems_unsigned32) Clock_clicks; - - itimer_value = get_itimer(); - - if (itimer_value < recent_count) - wrap_count++; - Clock_clicks = (((rtems_unsigned64) wrap_count) << 32) + itimer_value; - - rtems_interrupt_enable(isrlevel); - - return itimer_value; -} - - -void Install_clock(rtems_isr_entry clock_isr) -{ - Clock_driver_ticks = 0; - Clock_clicks_interrupt = 0; - Clock_clicks = 0; - - Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; - - if (BSP_Configuration.ticks_per_timeslice) - { - /* - * initialize the interval here - * First tick is set to right amount of time in the future - * Future ticks will be incremented over last value set - * in order to provide consistent clicks in the face of - * interrupt overhead - */ - - Clock_clicks_interrupt = Clock_read_itimer() + CPU_HPPA_CLICKS_PER_TICK; - set_itimer((rtems_unsigned32) Clock_clicks_interrupt); - - (void) set_vector(clock_isr, HPPA_INTERRUPT_EXTERNAL_INTERVAL_TIMER, 1); - } - atexit(Clock_exit); -} - -rtems_isr -Clock_isr(rtems_vector_number vector) -{ - rtems_unsigned32 clicks_til_next_interrupt; - rtems_unsigned32 itimer_value; - - /* - * setup for next interrupt; making sure the new value is reasonably - * in the future.... in case we lost out on an interrupt somehow - */ - - itimer_value = Clock_read_itimer(); - Clock_clicks_interrupt += CPU_HPPA_CLICKS_PER_TICK; - - /* - * how far away is next interrupt *really* - * It may be a long time; this subtraction works even if - * Clock_clicks_interrupt < Clock_clicks_low_order via - * the miracle of unsigned math. - */ - clicks_til_next_interrupt = Clock_clicks_interrupt - itimer_value; - - /* - * If it is too soon then bump it up. - * This should only happen if CPU_HPPA_CLICKS_PER_TICK is too small. - * But setting it low is useful for debug, so... - */ - - if (clicks_til_next_interrupt < 400) - { - Clock_clicks_interrupt = itimer_value + 1000; - /* XXX: count these! this should be rare */ - } - - /* - * If it is too late, that means we missed the interrupt somehow. - * Rather than wait 35-50s for a wrap, we just fudge it here. - */ - - if (clicks_til_next_interrupt > CPU_HPPA_CLICKS_PER_TICK) - { - Clock_clicks_interrupt = itimer_value + 1000; - /* XXX: count these! this should never happen :-) */ - } - - set_itimer((rtems_unsigned32) Clock_clicks_interrupt); - - Clock_driver_ticks++; - - if (Clock_isrs == 1) - { - rtems_clock_tick(); - Clock_isrs = BSP_Configuration.microseconds_per_tick / 10000; - if (Clock_isrs == 0) - Clock_isrs = 1; - } - else - Clock_isrs--; -} - -/* - * Called via atexit() - * Remove the clock interrupt handler by setting handler to NULL - */ - -void -Clock_exit(void) -{ - if ( BSP_Configuration.ticks_per_timeslice ) - { - (void) set_vector(0, HPPA_INTERRUPT_EXTERNAL_INTERVAL_TIMER, 1); - } -} - -/* - * spin delay for specified number of microseconds - * used by RTEMS delay macro - */ - -void -Clock_delay(rtems_unsigned32 microseconds) -{ - rtems_unsigned64 future_time; - - (void) Clock_read_itimer(); - future_time = Clock_clicks + - ((rtems_unsigned64) microseconds) * - Cpu_table.itimer_clicks_per_microsecond; - - for (;;) - { - (void) Clock_read_itimer(); - if (future_time <= Clock_clicks) - break; - } -} - -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; -} - -rtems_device_driver Clock_control( - rtems_device_major_number major, - rtems_device_minor_number minor, - void *pargp -) -{ - 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(HPPA_INTERRUPT_EXTERNAL_INTERVAL_TIMER); - } - else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) - { - ReInstall_clock(args->buffer); - } - -done: - return RTEMS_SUCCESSFUL; -} |