Enable PIT ISR to count milliseconds

src/hulk/pit.d

@@ -5,12 +5,13 @@ module hulk.pit;
 
 import hulk.cpu;
 import hulk.klog;
+import hulk.console;
 
 struct Pit
 {
     /** PIT input frequency in 1/1000 Hz. */
     private enum ulong PIT_FREQUENCY_1000HZ = 1_193_181_667u;
-    private enum ulong TARGET_INTERRUPT_HZ = 100u;
+    private enum ulong TARGET_INTERRUPT_HZ = 1000u;
     private enum ulong TARGET_INTERRUPT_1000HZ = TARGET_INTERRUPT_HZ * 1000u;
     private enum ulong PIT_DIVIDER = (PIT_FREQUENCY_1000HZ + TARGET_INTERRUPT_1000HZ / 2u) / TARGET_INTERRUPT_1000HZ;
 
@@ -28,8 +29,11 @@ struct Pit
     private enum ubyte MC_RATE_GENERATOR = 0x04u;
     private enum ubyte MC_BINARY = 0x00u;
 
+    private static __gshared ulong milliseconds;
+
     public static void initialize()
     {
+        Klog.writefln("\a3Initializing PIT");
         out8(PORT_MC, MC_CH_0 | MC_LO_HI | MC_RATE_GENERATOR | MC_BINARY);
         out8(PORT_CH_0, PIT_DIVIDER & 0xFFu);
         out8(PORT_CH_0, PIT_DIVIDER >> 8u);
@@ -37,6 +41,6 @@ struct Pit
 
     public static void isr()
     {
-        Klog.writefln("PIT ISR");
+        milliseconds++;
     }
 }