9 #define TIMER_QUANTUM 100
10 // 2^(15-rate), 15: 1HZ, 5: 1024Hz, 2: 8192Hz
11 #define TIMER_RATE 12 // (Max: 15, Min: 2) - 15 = 1Hz, 13 = 4Hz, 12 = 8Hz, 11 = 16Hz 10 = 32Hz, 2
12 #define TIMER_FREQ (0x8000>>TIMER_RATE) //Hz
13 #define MS_PER_TICK_WHOLE (1000/(TIMER_FREQ))
14 #define MS_PER_TICK_FRACT ((Uint64)(1000*TIMER_FREQ-((Uint64)MS_PER_TICK_WHOLE)*0x80000000/TIMER_FREQ))
17 extern Sint64 giTimestamp;
18 extern Uint64 giTicks;
19 extern Uint64 giPartMiliseconds;
20 extern void Timer_CallTimers(void);
23 void Time_Interrupt(int);
27 * \fn int Time_Setup(void)
28 * \brief Sets the system time from the Realtime-Clock
34 outb(0x70, inb(0x70)&0x7F); // Disable NMIs
35 __asm__ __volatile__ ("cli"); // Disable normal interrupts
37 // Set IRQ8 firing rate
38 outb(0x70, 0x0A); // Set the index to register A
39 val = inb(0x71); // Get the current value of register A
40 outb(0x70, 0x0A); // Reset index to A
43 outb(0x71, val); // Update the timer rate
46 outb(0x70, 0x0B); // Set the index to register B
47 val = inb(0x71); // Read the current value of register B
48 outb(0x70, 0x0B); // Set the index again (a read will reset the index to register D)
49 outb(0x71, val | 0x40); // Write the previous value or'd with 0x40. This turns on bit 6 of register D
51 __asm__ __volatile__ ("sti"); // Disable normal interrupts
52 outb(0x70, inb(0x70)|0x80); // Disable NMIs
54 // Install IRQ Handler
55 IRQ_AddHandler(8, Time_Interrupt);
60 * \fn void Time_Interrupt(void)
61 * \brief Called on the timekeeping IRQ
63 void Time_Interrupt(int irq)
66 giTimestamp += MS_PER_TICK_WHOLE;
67 giPartMiliseconds += MS_PER_TICK_FRACT;
68 if(giPartMiliseconds > 0x80000000) {
70 giPartMiliseconds -= 0x80000000;
75 // Make sure the RTC Fires again
76 outb(0x70, 0x0C); // Select register C
77 inb(0x71); // Just throw away contents.
82 * \fn void Time_TimerThread(void)
84 void Time_TimerThread(void)
87 Threads_SetName("TIMER");
89 next = giTimestamp + TIMER_QUANTUM;
92 while(giTimestamp < next) Threads_Yield();
93 next = giTimestamp + TIMER_QUANTUM;