Import XT kernel mode library

sdk/xtklib/hl/amd64/cpufunc.c

@@ -0,0 +1,56 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            sdk/xtklib/hl/cpufunc.c
+ * DESCRIPTION:     Routines to provide access to special AMD64 CPU instructions
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include "xtkmapi.h"
+
+
+/**
+ * Reads the data from the specified I/O port.
+ *
+ * @param Port
+ *        Specifies the port number in the range of 0-0xFFFF.
+ *
+ * @return The value read from the port.
+ *
+ * @since XT 1.0
+ */
+UCHAR
+XTAPI
+HlIoPortInByte(IN USHORT Port)
+{
+    UCHAR Value;
+    asm volatile("inb %1, %0"
+                 : "=a"(Value)
+                 : "Nd"(Port));
+    return Value;
+}
+
+/**
+ * Writes the data to the specified I/O port.
+ *
+ * @param Port
+ *        Specifies the port number in the range of 0-0xFFFF.
+ *
+ * @param Value
+ *        Supplies the value to write.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+VOID
+XTAPI
+HlIoPortOutByte(IN USHORT Port,
+                IN UCHAR Value)
+{
+    asm volatile("outb %0, %1"
+                 :
+                 :
+                 "a"(Value),
+                 "Nd"(Port));
+}