Make asm wrapper functions for inl and outl

src/asm.h

@@ -2,7 +2,8 @@
   asm.h contains x86 specific functions for executing low level code
 */
 
-#pragma once
+#ifndef _ASM_INC
+#define _ASM_INC
 #include <stdint.h>
 
 // Wrapper for outb
@@ -20,6 +21,20 @@ inline uint8_t inb(uint16_t port)
     return ret;
 }
 
+// Wrapper for outl
+inline void outl(uint16_t port, uint32_t val)
+{
+    asm volatile("outl %0, %1" : : "a"(val), "Nd"(port));
+}
+
+// Wrapper for inl
+inline uint32_t inl(uint16_t port)
+{
+    uint32_t ret;
+    asm volatile ("inl %1, %0" : "=a"(ret) : "Nd"(port));
+    return ret;
+}
+
 inline void disable_int()
 {
     asm volatile ("cli");
@@ -29,3 +44,5 @@ inline void enable_int()
 {
     asm volatile ("sti");
 }
+
+#endif