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clock.h

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/*!     \file include/kernel/clock.h
 *      \brief The system clock headers.
 *      \author Andrea Righi <drizzt@inwind.it>
 *      \date Last update: 2003-11-01
 *      \note Copyright (&copy;) 2003 Andrea Righi
 */

#ifndef CLOCK_H
#define CLOCK_H

/** \ingroup Kernel
 *  \defgroup KClock Clock Manager
 *  The system clock manager.
 *  @{
 */

#define LATCH_COUNT     0x00    //!< To copy chip count.
#define TIMER0          0x40    //!< I/O port for timer channel 0.
#define TIMER2          0x42    //!< I/O port for timer channel 2.
#define TIMER_MODE      0x43    //!< I/O port for timer mode control.
#define SQUARE_WAVE     0x36    //!< The sqare-wave form.
#define TIMER_FREQ      1193182L //!< Clock frequency for timer in PC.

//! Value to initialize timer.
#define TIMER_COUNT     (unsigned)(TIMER_FREQ/HZ)

//! LATCH is used for the interval timer.
#define LATCH           ((TIMER_FREQ + HZ/2) / HZ)

//! Clock Frequancy (User settable, default=200Hz)
#define HZ              200

//! Timeout variable structure.
typedef struct timeout
{
        dword start_ticks;
        dword ticks_to_wait;
} timeout_t;

// --- Prototypes ----------------------------------------------------- //

void init_clock();
void stop_clock();
dword sys_get_ticks(void);
void delay(dword millisec);

//! Macro equivalent to delay(dword millisec).
#define usleep(m)       delay(m)

void set_timeout(timeout_t *t, unsigned int millisec);
bool is_timeout(timeout_t *t);

void clock_thread();

/** @} */ // end of KClock

#endif

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