added include/portio.h; using it to update cursor position in kputc()

git-svn-id: svn://anubis/hos/trunk@55 5b3e749e-e535-0410-8002-a9bb6afbdfca

kernel/include/portio.h

@@ -0,0 +1,37 @@
+
+#ifndef PORTIO_H
+#define PORTIO_H
+
+#include "hos_types.h"
+
+#define outportb(port, val) \
+    __asm__ __volatile__ ("outb %%al, %%dx" : : "a" (val), "d" (port));
+
+#define outportw(port, val) \
+    __asm__ __volatile__ ("outw %%ax, %%dx" : : "a" (val), "d" (port));
+
+#define outportd(port, val) \
+    __asm__ __volatile__ ("outl %%eax, %%dx" : : "a" (val), "d" (port));
+
+#define inportb(port) \
+    ({ \
+        u8_t val; \
+        __asm__ __volatile__ ("inb %%dx, %%al" : "=a" (val) : "d" (port)); \
+        val; \
+    });
+
+#define inportw(port) \
+    ({ \
+        u16_t val; \
+        __asm__ __volatile__ ("inw %%dx, %%al" : "=a" (val) : "d" (port)); \
+        val; \
+    });
+
+#define inportd(port) \
+    ({ \
+        u32_t val; \
+        __asm__ __volatile__ ("inl %%dx, %%al" : "=a" (val) : "d" (port)); \
+        val; \
+    });
+
+#endif