[BOOT] Print functions for debugging

kernel/arch/ports.c

@@ -0,0 +1,27 @@
+#include <ports.h>
+#include <stdint.h>
+
+void outb(uint16_t port, uint8_t value)
+{
+  // Send byte to port
+  asm volatile("outb %1, %0" : : "dN" (port), "a" (value));
+}
+
+uint8_t inb(uint16_t port)
+{
+  uint8_t ret;
+  asm volatile("inb %1, %0" : "=a" (ret) : "dN" (port));
+  return ret;
+}
+
+void outw(uint16_t port, uint16_t value)
+{
+  asm volatile("outw %1, %0" : : "dN" (port), "a" (value));
+}
+
+uint16_t inw(uint16_t port)
+{
+  uint16_t ret;
+  asm volatile("inw %1, %0" : "=a" (ret) : "dN" (port));
+  return ret;
+}