Implement HlReadApicRegister() and HlWriteApicRegister() routines for basic APIC support

xtoskrnl/hl/apic.c

@@ -0,0 +1,48 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/hl/apic.c
+ * DESCRIPTION:     Advanced Programmable Interrupt Controller (APIC) support
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <xtos.h>
+
+
+/**
+ * Reads from the local APIC register.
+ *
+ * @param Register
+ *        Supplies the APIC register to read from.
+ *
+ * @return This routine returns the value read from the APIC register.
+ *
+ * @since XT 1.0
+ */
+XTFASTCALL
+ULONG
+HlReadApicRegister(IN APIC_REGISTER Register)
+{
+    return RtlReadRegisterLong((PULONG)APIC_BASE + (Register << 4));
+}
+
+/**
+ * Writes to the local APIC register.
+ *
+ * @param Register
+ *        Supplies the APIC register to write to.
+ *
+ * @param Value
+ *        Supplies the value to write to the APIC register.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTFASTCALL
+VOID
+HlWriteApicRegister(IN APIC_REGISTER Register,
+                    IN ULONG Value)
+{
+    RtlWriteRegisterLong((PULONG)APIC_BASE + (Register << 4), Value);
+}