Implement spurious interrupt handler

xtoskrnl/ar/amd64/archsup.S

@@ -4,6 +4,7 @@
  * FILE:            xtoskrnl/ar/amd64/archsup.S
  * DESCRIPTION:     Provides AMD64 architecture features not implementable in C
  * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ *                  Aiken Harris <harraiken91@gmail.com>
  */
 
 #include <ar/amd64/asmsup.h>
@@ -224,3 +225,14 @@ ArTrapEntry:
         .quad ArTrap0x\i\j
     .endr
 .endr
+
+/**
+ * Handles a spurious interrupt allowing it to end up.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+.global ArHandleSpuriousInterrupt
+ArHandleSpuriousInterrupt:
+    iretq

xtoskrnl/ar/i686/archsup.S

@@ -213,3 +213,14 @@ _ArTrapEntry:
         .endif
     .endr
 .endr
+
+/**
+ * Handles a spurious interrupt allowing it to end up.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+.global _ArHandleSpuriousInterrupt
+_ArHandleSpuriousInterrupt:
+    iret

xtoskrnl/includes/ar/amd64/assembly.hh

@@ -25,6 +25,11 @@ XTCLINK PVOID ArStartApplicationProcessorEnd[];
 XTCLINK ULONG_PTR ArTrapEntry[256];
 
 /* Forward reference for assembler code */
+XTCLINK
+XTCDECL
+VOID
+ArHandleSpuriousInterrupt(VOID);
+
 XTCLINK
 XTCDECL
 VOID

xtoskrnl/includes/ar/i686/assembly.hh

@@ -22,6 +22,11 @@ XTCLINK PVOID ArStartApplicationProcessorEnd[];
 XTCLINK ULONG_PTR ArTrapEntry[256];
 
 /* Forward reference for assembler code */
+XTCLINK
+XTCDECL
+VOID
+ArHandleSpuriousInterrupt(VOID);
+
 XTCLINK
 XTCDECL
 VOID