Implement APIC timer initialization and calibration

xtoskrnl/includes/hl.hh

@@ -21,6 +21,7 @@
 #include <hl/irq.hh>
 #include <hl/pic.hh>
 #include <hl/runlevel.hh>
+#include <hl/timer.hh>
 
 
 #endif /* __XTOSKRNL_HL_HH */

xtoskrnl/includes/hl/timer.hh

@@ -0,0 +1,38 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/includes/hl/timer.hh
+ * DESCRIPTION:     ACPI Timer support
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#ifndef __XTOSKRNL_HL_TIMER_HH
+#define __XTOSKRNL_HL_TIMER_HH
+
+#include <xtos.hh>
+
+
+/* Hardware Layer */
+namespace HL
+{
+    class Timer
+    {
+        private:
+            STATIC ULONG ProfilingInterval;
+            STATIC ULONG TimerFrequency;
+
+        public:
+            STATIC XTAPI VOID InitializeApicTimer(VOID);
+            STATIC XTAPI ULONG_PTR SetProfileInterval(IN ULONG_PTR Interval);
+            STATIC XTAPI VOID StartProfileInterrupt(IN KPROFILE_SOURCE ProfileSource);
+            STATIC XTAPI VOID StopProfileInterrupt(IN KPROFILE_SOURCE ProfileSource);
+
+        private:
+            STATIC XTAPI XTSTATUS CalibrateApicTimer();
+            STATIC XTAPI XTSTATUS GetApicTimerFrequency(OUT PULONG Frequency);
+            STATIC XTAPI VOID PitStallExecution(IN ULONG Us);
+            STATIC XTAPI VOID StallExecution(IN ULONG MicroSeconds);
+    };
+}
+
+#endif /* __XTOSKRNL_HL_TIMER_HH */