9 #define TIMER_QUANTUM 100
10 // 2^(15-rate), 15: 1HZ, 5: 1024Hz, 2: 8192Hz
11 // (Max: 15, Min: 2) - 15 = 1Hz, 13 = 4Hz, 12 = 8Hz, 11 = 16Hz 10 = 32Hz, 2 = 8192Hz
13 //#define TIMER_RATE 12
14 //#define TIMER_RATE 15
15 #define TIMER_FREQ (0x8000>>TIMER_RATE) //Hz
16 #define MS_PER_TICK_WHOLE (1000/(TIMER_FREQ))
17 #define MS_PER_TICK_FRACT ((0x80000000*(1000%TIMER_FREQ))/TIMER_FREQ)
20 extern Sint64 giTimestamp;
21 extern Uint64 giTicks;
22 extern Uint64 giPartMiliseconds;
23 extern void Timer_CallTimers(void);
26 void Time_Interrupt(int);
30 * \fn int Time_Setup(void)
31 * \brief Sets the system time from the Realtime-Clock
37 Log_Log("Timer", "RTC Timer firing at %iHz (%i divisor), %i.0x%08x",
38 TIMER_FREQ, TIMER_RATE, MS_PER_TICK_WHOLE, MS_PER_TICK_FRACT);
40 outb(0x70, inb(0x70)&0x7F); // Disable NMIs
41 __asm__ __volatile__ ("cli"); // Disable normal interrupts
43 // Set IRQ8 firing rate
44 outb(0x70, 0x0A); // Set the index to register A
45 val = inb(0x71); // Get the current value of register A
46 outb(0x70, 0x0A); // Reset index to A
49 outb(0x71, val); // Update the timer rate
52 outb(0x70, 0x0B); // Set the index to register B
53 val = inb(0x71); // Read the current value of register B
54 outb(0x70, 0x0B); // Set the index again (a read will reset the index to register D)
55 outb(0x71, val | 0x40); // Write the previous value or'd with 0x40. This turns on bit 6 of register D
57 __asm__ __volatile__ ("sti"); // Re-enable normal interrupts
58 outb(0x70, inb(0x70)|0x80); // Re-enable NMIs
60 // Install IRQ Handler
61 IRQ_AddHandler(8, Time_Interrupt);
63 // Make sure the RTC actually fires
64 outb(0x70, 0x0C); // Select register C
65 inb(0x71); // Just throw away contents.
71 * \brief Called on the timekeeping IRQ
72 * \param irq IRQ number (unused)
74 void Time_Interrupt(int irq)
79 giTimestamp += MS_PER_TICK_WHOLE;
80 giPartMiliseconds += MS_PER_TICK_FRACT;
81 if(giPartMiliseconds > 0x80000000) {
83 giPartMiliseconds -= 0x80000000;
88 // Make sure the RTC Fires again
89 outb(0x70, 0x0C); // Select register C
90 inb(0x71); // Just throw away contents.
95 * \fn void Time_TimerThread(void)
97 void Time_TimerThread(void)
100 Threads_SetName("TIMER");
102 next = giTimestamp + TIMER_QUANTUM;
105 while(giTimestamp < next) Threads_Yield();
106 next = giTimestamp + TIMER_QUANTUM;