Remove the BUILD_INFO_FILE variable
[akaros.git] / kern / arch / x86 / time.c
index 547251c..2c3d506 100644 (file)
 #include <trap.h>
 #include <assert.h>
 #include <stdio.h>
+#include <ros/procinfo.h>
 
-system_timing_t system_timing = {0, 0, 0xffff, 0};
+static uint16_t pit_divisor;
+static uint8_t pit_mode;
 
 // timer init calibrates both tsc timer and lapic timer using PIT
 void timer_init(void){
@@ -26,8 +28,8 @@ void timer_init(void){
        tscval[0] = read_tsc();
        udelay_pit(1000000);
        tscval[1] = read_tsc();
-       system_timing.tsc_freq = tscval[1] - tscval[0];
-       cprintf("TSC Frequency: %llu\n", system_timing.tsc_freq);
+       __proc_global_info.tsc_freq = tscval[1] - tscval[0];
+       cprintf("TSC Frequency: %llu\n", __proc_global_info.tsc_freq);
        __lapic_set_timer(0xffffffff, IdtLAPIC_TIMER, FALSE,
                          LAPIC_TIMER_DIVISOR_BITS);
        // Mask the LAPIC Timer, so we never receive this interrupt (minor race)
@@ -35,13 +37,14 @@ void timer_init(void){
        timercount[0] = apicrget(MSR_LAPIC_CURRENT_COUNT);
        udelay_pit(1000000);
        timercount[1] = apicrget(MSR_LAPIC_CURRENT_COUNT);
-       system_timing.bus_freq = (timercount[0] - timercount[1])
+       __proc_global_info.bus_freq = (timercount[0] - timercount[1])
                                 * LAPIC_TIMER_DIVISOR_VAL;
+       assert(__proc_global_info.bus_freq);
        /* The time base for the timer is derived from the processor's bus clock,
         * divided by the value specified in the divide configuration register.
         * Note we mult and div by the divisor, saving the actual freq (even though
         * we don't use it yet). */
-       cprintf("Bus Frequency: %llu\n", system_timing.bus_freq);
+       cprintf("Bus Frequency: %llu\n", __proc_global_info.bus_freq);
 }
 
 void pit_set_timer(uint32_t divisor, uint32_t mode)
@@ -52,8 +55,8 @@ void pit_set_timer(uint32_t divisor, uint32_t mode)
        outb(TIMER_MODE, mode);
        outb(TIMER_CNTR0, divisor & 0xff);
        outb(TIMER_CNTR0, (divisor >> 8) );
-       system_timing.pit_mode = mode;
-       system_timing.pit_divisor = divisor;
+       pit_mode = mode;
+       pit_divisor = divisor;
        // cprintf("timer mode set to %d, divisor %d\n",mode, divisor);
 }
 
@@ -75,7 +78,7 @@ static int getpit()
 void udelay(uint64_t usec)
 {
        #if !defined(__BOCHS__)
-       if (system_timing.tsc_freq != 0)
+       if (__proc_global_info.tsc_freq != 0)
        {
                uint64_t start, end, now;
 
@@ -100,33 +103,23 @@ void udelay(uint64_t usec)
 void udelay_pit(uint64_t usec)
 {
        int64_t delta, prev_tick, tick, ticks_left;
+
+       if (usec <= 0)
+               return;
+
        prev_tick = getpit();
        /*
-        * Calculate (n * (i8254_freq / 1e6)) without using floating point
-        * and without any avoidable overflows.
+        * Calculate ticks as (usec * (i8254_freq / 1e6)) rounded up
+        * without using floating point and without any avoidable overflows.
         */
-       if (usec <= 0)
-               ticks_left = 0;
-       // some optimization from bsd code
-       else if (usec < 256)
-               /*
-                * Use fixed point to avoid a slow division by 1000000.
-                * 39099 = 1193182 * 2^15 / 10^6 rounded to nearest.
-                * 2^15 is the first power of 2 that gives exact results
-                * for n between 0 and 256.
-                */
-               ticks_left = ((uint64_t)usec * 39099 + (1 << 15) - 1) >> 15;
-       else
-               // round up the ticks left
-               ticks_left = ((uint64_t)usec * (long long)PIT_FREQ+ 999999)
-                            / 1000000;
+       ticks_left = ((usec * PIT_FREQ) + 999999) / 1000000;
        while (ticks_left > 0) {
                tick = getpit();
                delta = prev_tick - tick;
                prev_tick = tick;
                if (delta < 0) {
                        // counter looped around during the delta time period
-                       delta += system_timing.pit_divisor; // maximum count
+                       delta += pit_divisor; // maximum count
                        if (delta < 0)
                                delta = 0;
                }
@@ -141,7 +134,7 @@ uint64_t gettimer(void)
 
 uint64_t getfreq(void)
 {
-       return system_timing.tsc_freq;
+       return __proc_global_info.tsc_freq;
 }
 
 void set_core_timer(uint32_t usec, bool periodic)