Added port I/O and print function

Author: Retr0-code

bootloader/printf.asm

@@ -1,4 +1,4 @@
-global _printf
+global _printformat
 
 section .text:
     _printformat:

build/OS.bin

@@ -0,0 +1,46 @@
+#include "port_io.h"
+
+// Send byte
+void pb_out(uint16_t port, uint8_t data)
+{
+    __asm__("outb %%al, %%dx" : : "a"(data), "d"(port));
+	return;
+}
+
+// Send word
+void pw_out(uint16_t port, uint16_t data)
+{
+    __asm__("outw %%ax, %%dx" : : "a"(data), "d"(port));
+	return;
+}
+
+// Send dword
+void pd_out(uint16_t port, uint32_t data)
+{
+    __asm__("outl %%eax, %%edx" : : "a"(data), "d"(port));
+	return;
+}
+
+// Receive byte
+uint8_t pb_in(uint16_t port)
+{
+    uint8_t result = 0;
+    __asm__("inb %%dx, %%al" : "=a"(result) : "d"(port));
+    return result;
+}
+
+// Receive word
+uint16_t pw_in(uint16_t port)
+{
+    uint16_t result = 0;
+    __asm__("inw %%dx, %%ax" : "=a"(result) : "d"(port));
+    return result;
+}
+
+// Receive dword
+uint32_t pd_in(uint16_t port)
+{
+    uint32_t result = 0;
+    __asm__("inl %%edx, %%eax" : "=a"(result) : "d"(port));
+    return result;
+}

build/full_kernel.bin

@@ -0,0 +1,14 @@
+#ifndef PORT_IO_H
+#define PORT_IO_H
+
+#include "../lib/std/datatypes.h"
+
+void pb_out(uint16_t port, uint8_t data);
+void pw_out(uint16_t port, uint16_t data);
+void pd_out(uint16_t port, uint32_t data);
+
+uint8_t pb_in(uint16_t port);
+uint16_t pw_in(uint16_t port);
+uint32_t pd_in(uint16_t port);
+
+#endif

build/kernel.o

@@ -1,4 +1,7 @@
-extern void main(){
-    *(char*)0xb8000 = 'Q';
+#include "lib/std/io.h"
+
+extern void main()
+{
+    _printk("Hey! I am writing straight to video memory", 0x0f);
     return;
 }

build/printk.o

@@ -0,0 +1,14 @@
+#ifndef DATATYPES_H
+#define DATATYPES_H
+
+typedef char int8_t;
+typedef short int int16_t;
+typedef int int32_t;
+typedef long long int int64_t;
+
+typedef unsigned char uint8_t;
+typedef unsigned short int uint16_t;
+typedef unsigned int uint32_t;
+typedef unsigned long long int uint64_t;
+
+#endif

kernel/drivers/port_io.c

@@ -0,0 +1,9 @@
+#ifndef VGA_TEXT_MODE_H
+#define VGA_TEXT_MODE_H
+
+#include "datatypes.h"
+#include "../../drivers/port_io.h"
+
+void _printk(const char*, uint8_t);
+
+#endif