extracted assembly wrappers into src/x86_64/asm.c

Makefile

@@ -8,6 +8,7 @@ include config.mk
 KERNEL_SOURCES_x86_64 := \
 	src/x86_64/uart.c \
 	src/x86_64/mem.c \
+	src/x86_64/asm.c \
 	# end of x86_64 specific kernel sources list
 
 # Architecture-agnostic kernel sources.

include/asm.h

@@ -0,0 +1,11 @@
+#ifndef KARLOS_ASM_H
+#define KARLOS_ASM_H
+
+#include <stdint.h>
+
+int inb(int port);
+uint32_t inl(int port);
+void outb(int port, int value);
+void outl(int port, uint32_t value);
+
+#endif

src/x86_64/asm.c

@@ -0,0 +1,27 @@
+#include "asm.h"
+
+int
+inb(int port)
+{
+	unsigned char value;
+	__asm__ ("inb %%dx" : "=a"(value) : "d"(port));
+	return value;
+}
+
+uint32_t inl(int port) {
+    uint32_t value;
+    __asm__ ("inl %%dx" : "=a"(value) : "d"(port));
+    return value;
+}
+
+void
+outb(int port, int value)
+{
+	__asm__ ("outb %%dx" :: "d"(port), "a"(value));
+}
+
+void
+outl(int port, uint32_t value)
+{
+	__asm__ ("outl %%dx" :: "d"(port), "a"(value));
+}

src/x86_64/uart.c

@@ -1,19 +1,7 @@
+#include "asm.h"
+
 #define COM1_BASE_PORT 0x3F8
 
-int
-inb(int port)
-{
-	unsigned char value;
-	__asm__ ("inb %%dx" : "=a"(value) : "d"(port));
-	return value;
-}
-
-void
-outb(int port, int value)
-{
-	__asm__ ("outb %%dx" :: "d"(port), "a"(value));
-}
-
 void
 uart_write_char(char c)
 {