timer.h

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#pragma once
 
#include "kernel.h"
#include "stdint.h"
#include "sys/list_head.h"
#include "klib/spinlock.h"
#include "process/process.h"
#include "time.h"
 
#define ENABLE_REAL_TIMER_SYSTEM
 
//#define ENABLE_REAL_TIMER_SYSTEM_DUMP
 
#define ITIMER_REAL 0
#define ITIMER_VIRTUAL 1
#define ITIMER_PROF 2
 
#define TICKS_PER_SECOND 1193
 
void timer_handler(pt_regs *f);
 
void timer_install(void);
 
uint64_t timer_get_seconds(void);
 
unsigned long timer_get_ticks(void);
 
void timer_phase(const uint32_t hz);
 
// ===============================================================================
// Per-CPU timer vectors
 
#ifdef ENABLE_REAL_TIMER_SYSTEM
 
#define TVN_COUNT 4
#define TVN_BITS 6
#define TVR_BITS 8
#define TVN_SIZE (1 << TVN_BITS)
#define TVR_SIZE (1 << TVR_BITS)
#define TVN_MASK (TVN_SIZE - 1)
#define TVR_MASK (TVR_SIZE - 1)
#define TIMER_TICKS_BITS(tv) (TVR_BITS + TVN_BITS * (tv))
#define TIMER_TICKS(tv) (1 << TIMER_TICKS_BITS(tv))
 
#endif
 
typedef struct tvec_base_s {
    spinlock_t lock;
    struct timer_list *running_timer;
#ifdef ENABLE_REAL_TIMER_SYSTEM
    unsigned long timer_ticks;
 
    list_head tvr[TVR_SIZE];
    list_head tvn[TVN_COUNT][TVN_SIZE];
 
#else
    struct list_head list;
#endif
 
} tvec_base_t;
 
struct timer_list {
    spinlock_t lock;
    struct list_head entry;
    unsigned long expires;
    void (*function)(unsigned long);
    unsigned long data;
    tvec_base_t *base;
};
 
void dynamic_timers_install(void);
 
void init_timer(struct timer_list *timer);
 
void run_timer_softirq(void);
 
void add_timer(struct timer_list *timer);
 
void remove_timer(struct timer_list *timer);
 
int sys_nanosleep(const struct timespec *req, struct timespec *rem);
 
unsigned sys_alarm(int seconds);
 
int sys_getitimer(int which, struct itimerval *curr_value);
 
int sys_setitimer(int which, const struct itimerval *new_value, struct itimerval *old_value);
 
void update_process_profiling_timer(task_struct *proc);