minix/kernel/clock.h

#ifndef __CLOCK_H__
#define __CLOCK_H__

#include "kernel.h"
#include "arch_clock.h"

_PROTOTYPE(int boot_cpu_init_timer, (unsigned freq));
_PROTOTYPE(int app_cpu_init_timer, (unsigned freq));

_PROTOTYPE(int timer_int_handler, (void));

_PROTOTYPE(int arch_init_local_timer, (unsigned freq));
_PROTOTYPE(void arch_stop_local_timer, (void));
_PROTOTYPE(int arch_register_local_timer_handler, (irq_handler_t handler));

_PROTOTYPE( u64_t ms_2_cpu_time, (unsigned ms));

#endif /* __CLOCK_H__ */
Clock task split - preemption handled in the clock timer interrupt handler, not in the clock task - more achitecture independent clock timer handling code - smp ready as each CPU can have its own timer 2009-11-06 10:04:15 +01:00			`#ifndef __CLOCK_H__`
			`#define __CLOCK_H__`

			`#include "kernel.h"`
Convert kernel over to bsdmake 2010-04-02 00:22:33 +02:00			`#include "arch_clock.h"`
Clock task split - preemption handled in the clock timer interrupt handler, not in the clock task - more achitecture independent clock timer handling code - smp ready as each CPU can have its own timer 2009-11-06 10:04:15 +01:00
			`_PROTOTYPE(int boot_cpu_init_timer, (unsigned freq));`
SMP - Only a single APIC timer handler - bsp_timer_int_handler() and ap_timer_int_handler() unified into timer_int_handler() - global realtime updated only on BSP 2010-09-15 16:10:09 +02:00			`_PROTOTYPE(int app_cpu_init_timer, (unsigned freq));`
Clock task split - preemption handled in the clock timer interrupt handler, not in the clock task - more achitecture independent clock timer handling code - smp ready as each CPU can have its own timer 2009-11-06 10:04:15 +01:00
SMP - Only a single APIC timer handler - bsp_timer_int_handler() and ap_timer_int_handler() unified into timer_int_handler() - global realtime updated only on BSP 2010-09-15 16:10:09 +02:00			`_PROTOTYPE(int timer_int_handler, (void));`
Clock task split - preemption handled in the clock timer interrupt handler, not in the clock task - more achitecture independent clock timer handling code - smp ready as each CPU can have its own timer 2009-11-06 10:04:15 +01:00
			`_PROTOTYPE(int arch_init_local_timer, (unsigned freq));`
			`_PROTOTYPE(void arch_stop_local_timer, (void));`
			`_PROTOTYPE(int arch_register_local_timer_handler, (irq_handler_t handler));`

scheduling - time quantum in miliseconds - Currently the cpu time quantum is timer-ticks based. Thus the remaining quantum is decreased only if the processes is interrupted by a timer tick. As processes block a lot this typically does not happen for normal user processes. Also the quantum depends on the frequency of the timer. - This change makes the quantum miliseconds based. Internally the miliseconds are translated into cpu cycles. Everytime userspace execution is interrupted by kernel the cycles just consumed by the current process are deducted from the remaining quantum. - It makes the quantum system timer frequency independent. - The boot processes quantum is loosely derived from the tick-based quantas and 60Hz timer and subject to future change - the 64bit arithmetics is a little ugly, will be changes once we have compiler support for 64bit integers (soon) 2010-05-25 10:06:14 +02:00			`_PROTOTYPE( u64_t ms_2_cpu_time, (unsigned ms));`

Clock task split - preemption handled in the clock timer interrupt handler, not in the clock task - more achitecture independent clock timer handling code - smp ready as each CPU can have its own timer 2009-11-06 10:04:15 +01:00			`#endif /* __CLOCK_H__ */`