Disable legacy 8259 PIC before enabling APIC

Reviewed-on: #5
Reviewed-by: Rafal Kupiec <belliash@noreply.codingworkshop.git>
Co-authored-by: Jozef Nagy <schkwve@gmail.com>
Co-committed-by: Jozef Nagy <schkwve@gmail.com>

xtoskrnl/hl/x86/pic.c

@@ -4,10 +4,25 @@
  * FILE:            xtoskrnl/hl/x86/pic.c
  * DESCRIPTION:     Programmable Interrupt Controller (PIC) for x86 (i686/AMD64) support
  * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ *                  Jozef Nagy <schkwve@gmail.com>
  */
 
 #include <xtos.h>
 
+/**
+ * Disables the 8259 PIC.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+VOID
+HlDisablePic(VOID)
+{
+    HlIoPortOutByte(PIC1_DATA_PORT, 0xFF);
+    HlIoPortOutByte(PIC2_DATA_PORT, 0xFF);
+}
 
 /**
  * Reads from the APIC register.

xtoskrnl/includes/hl.h

@@ -11,8 +11,11 @@
 
 #include <xtos.h>
 
-
 /* HAL library routines forward references */
+XTCDECL
+VOID
+HlDisablePic(VOID);
+
 XTAPI
 VOID
 HlClearScreen(VOID);

xtoskrnl/ke/amd64/krnlinit.c

@@ -69,6 +69,9 @@ KepInitializeMachine(VOID)
     /* Re-enable IDE interrupts */
     HlIoPortOutByte(0x376, 0);
     HlIoPortOutByte(0x3F6, 0);
+
+    /* Disable the legacy PIC */
+    HlDisablePic();
 }
 
 /**

xtoskrnl/ke/i686/krnlinit.c

@@ -69,6 +69,9 @@ KepInitializeMachine(VOID)
     /* Re-enable IDE interrupts */
     HlIoPortOutByte(0x376, 0);
     HlIoPortOutByte(0x3F6, 0);
+
+	/* Disable the legacy PIC */
+    HlDisablePic();
 }
 
 /**