Kernel IO

kernel/kernio.cpp

@@ -0,0 +1,13 @@
+#include "kernio.h"
+
+inline void outb(uint16_t port, uint8_t b) {
+    asm("outb %0, %1" : : "a"(b), "Nd"(port));
+}
+
+inline uint8_t inb(uint16_t port) {
+    uint8_t ret;
+    asm volatile ( "inb %1, %0"
+                   : "=a"(ret)    // Output
+                   : "Nd"(port)); // Input
+    return ret;
+}

kernel/kernio.h

@@ -0,0 +1,4 @@
+#include <lib/stdint.h>
+
+inline void outb(uint16_t port, uint8_t b);
+inline uint8_t inb(uint16_t port);