diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c6f9a44
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.vscode/settings.json
diff --git a/README.md b/README.md
index cedf6af..2aa7c91 100644
--- a/README.md
+++ b/README.md
@@ -22,3 +22,13 @@
 * https://www.slideshare.net/uchan_nos/uefielf
 * 最新情報処理概論 改訂版 P.96~P.98
 * 平成30年度キタミ式応用情報技術者 P.268~P.333
+
+# ビルド方法
+```git clone https://github.com/tianocore/edk2.git```  
+```cd edk2```  
+```git clone https://gitlab.pepepper.cf/ecri/sprinkleos.git```  
+```. edksetup.sh```  
+```make -C BaseTools/Source/C```  
+target.txtのACTIVE_PLATFORMをsprinkleos/sprinkleos.dscに TARGET_ARCHをX64に TOOL_CHAIN_TAGをGCC5に
+```build```
+出来上がったBuild/SprinkleOSX64/DEBUG_GCC5/X64/sprinkleos.efiを上手いこと起動
\ No newline at end of file
diff --git a/fb.c b/fb.c
new file mode 100644
index 0000000..f75dbd9
--- /dev/null
+++ b/fb.c
@@ -0,0 +1,17 @@
+#include "fb.h"
+struct FrameBuffer buffer;
+void FrameBuffer_init(
+    EFI_GRAPHICS_OUTPUT_PROTOCOL *gop) {  // Initialize framebuffer struct
+    buffer.BaseAddress = gop->Mode->FrameBufferBase;
+    buffer.Size = gop->Mode->FrameBufferSize;
+    buffer.HorizontalRes = gop->Mode->Info->HorizontalResolution;
+    buffer.VerticalRes = gop->Mode->Info->VerticalResolution;
+    buffer.PixelFormat = gop->Mode->Info->PixelFormat;
+}
+
+void RGBtoPixel(EFI_GRAPHICS_OUTPUT_BLT_PIXEL *pixel,
+                UINT32 RGB) {  // 0xaaaaaa format RGB to BGR Pixel format
+    pixel->Blue = RGB & 0xff;
+    pixel->Green = (RGB >> 8) & 0xff;
+    pixel->Red = (RGB >> 16) & 0xff;
+}
\ No newline at end of file
diff --git a/fb.h b/fb.h
new file mode 100644
index 0000000..5d7ae8b
--- /dev/null
+++ b/fb.h
@@ -0,0 +1,14 @@
+#include <Protocol/GraphicsOutput.h>
+
+struct FrameBuffer {
+    EFI_PHYSICAL_ADDRESS BaseAddress;
+    UINTN Size;
+    UINT32 HorizontalRes;
+    UINT32 VerticalRes;
+    EFI_GRAPHICS_PIXEL_FORMAT PixelFormat;
+};
+
+extern struct FrameBuffer buffer;
+
+void FrameBuffer_init(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop);
+void RGBtoPixel(EFI_GRAPHICS_OUTPUT_BLT_PIXEL *pixel, UINT32 RGB);
\ No newline at end of file
diff --git a/font.h b/font.h
new file mode 100644
index 0000000..2d0569f
--- /dev/null
+++ b/font.h
@@ -0,0 +1,513 @@
+char font[256][13] = {  // from mplus_f12r.bdf
+    {0x00, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x20, 0x70, 0xF8, 0x70, 0x20, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x54, 0xA8, 0x54, 0xA8, 0x54, 0xA8, 0x54, 0xA8, 0x54, 0xA8, 0x54,
+     0xA8},
+    {0x00, 0x88, 0x88, 0xF8, 0x88, 0x88, 0x00, 0xF8, 0x20, 0x20, 0x20, 0x20,
+     0x00},
+    {0x00, 0xF8, 0x80, 0xF8, 0x80, 0x80, 0x00, 0xF8, 0x80, 0xF8, 0x80, 0x80,
+     0x00},
+    {0x00, 0xF8, 0x88, 0x80, 0x88, 0xF8, 0x00, 0xF8, 0x88, 0xF8, 0x90, 0x88,
+     0x00},
+    {0x00, 0x80, 0x80, 0x80, 0x80, 0xF8, 0x00, 0xF8, 0x80, 0xF8, 0x80, 0x80,
+     0x00},
+    {0x00, 0x60, 0x90, 0x90, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x20, 0x20, 0xF8, 0x20, 0x20, 0x00, 0x00, 0xF8, 0x00,
+     0x00},
+    {0x00, 0x88, 0xC8, 0xA8, 0x98, 0x88, 0x00, 0x80, 0x80, 0x80, 0x80, 0xF8,
+     0x00},
+    {0x00, 0x88, 0x88, 0x88, 0x90, 0xE0, 0x00, 0xF8, 0x20, 0x20, 0x20, 0x20,
+     0x00},
+    {0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0xE0, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE0, 0x20, 0x20, 0x20, 0x20,
+     0x20},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3C, 0x20, 0x20, 0x20, 0x20,
+     0x20},
+    {0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x3C, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0xFC, 0x20, 0x20, 0x20, 0x20,
+     0x20},
+    {0x00, 0x00, 0x00, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFC, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFC, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFC,
+     0x00},
+    {0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x3C, 0x20, 0x20, 0x20, 0x20,
+     0x20},
+    {0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0xE0, 0x20, 0x20, 0x20, 0x20,
+     0x20},
+    {0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0xFC, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFC, 0x20, 0x20, 0x20, 0x20,
+     0x20},
+    {0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
+     0x20},
+    {0x00, 0x00, 0x10, 0x20, 0x40, 0x80, 0x40, 0x20, 0x10, 0x00, 0xF8, 0x00,
+     0x00},
+    {0x00, 0x00, 0x40, 0x20, 0x10, 0x08, 0x10, 0x20, 0x40, 0x00, 0xF8, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0x50, 0x50, 0x50, 0x90, 0x90, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x10, 0x10, 0xF8, 0x20, 0xF8, 0x40, 0x40, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x30, 0x48, 0x40, 0x40, 0xF0, 0x40, 0x40, 0x60, 0x98, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x70, 0x20, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x20, 0x00,
+     0x00},
+    {0x00, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x50, 0x50, 0xF8, 0x50, 0x50, 0x50, 0xF8, 0x50, 0x50, 0x00,
+     0x00},
+    {0x00, 0x00, 0x20, 0x78, 0xA0, 0xA0, 0x70, 0x28, 0x28, 0xF0, 0x20, 0x00,
+     0x00},
+    {0x00, 0x00, 0x40, 0xA0, 0x48, 0x10, 0x20, 0x40, 0x90, 0x28, 0x10, 0x00,
+     0x00},
+    {0x00, 0x00, 0x60, 0x90, 0x90, 0x60, 0x48, 0xA8, 0x90, 0x90, 0x68, 0x00,
+     0x00},
+    {0x00, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x10, 0x20, 0x20, 0x40, 0x40, 0x40, 0x40, 0x40, 0x20, 0x20, 0x10,
+     0x00},
+    {0x00, 0x40, 0x20, 0x20, 0x10, 0x10, 0x10, 0x10, 0x10, 0x20, 0x20, 0x40,
+     0x00},
+    {0x00, 0x00, 0x00, 0x20, 0xA8, 0x70, 0x20, 0x70, 0xA8, 0x20, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x20, 0x20, 0xF8, 0x20, 0x20, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x70, 0x20, 0x40,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x70, 0x20, 0x00,
+     0x00},
+    {0x00, 0x00, 0x08, 0x08, 0x10, 0x10, 0x20, 0x20, 0x40, 0x40, 0x80, 0x80,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x88, 0x98, 0xA8, 0xC8, 0x88, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x20, 0x60, 0xA0, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x88, 0x08, 0x10, 0x20, 0x40, 0x80, 0xF8, 0x00,
+     0x00},
+    {0x00, 0x00, 0xF8, 0x08, 0x10, 0x20, 0x70, 0x08, 0x08, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x30, 0x30, 0x50, 0x50, 0x90, 0x90, 0xF8, 0x10, 0x10, 0x00,
+     0x00},
+    {0x00, 0x00, 0xF8, 0x80, 0x80, 0xF0, 0x08, 0x08, 0x88, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x30, 0x40, 0x80, 0xF0, 0x88, 0x88, 0x88, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0xF8, 0x08, 0x10, 0x10, 0x20, 0x20, 0x40, 0x40, 0x40, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x88, 0x50, 0x20, 0x50, 0x88, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x88, 0x88, 0x88, 0x78, 0x08, 0x10, 0x60, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x20, 0x70, 0x20, 0x00, 0x20, 0x70, 0x20, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x20, 0x70, 0x20, 0x00, 0x20, 0x70, 0x20, 0x40,
+     0x00},
+    {0x00, 0x00, 0x08, 0x10, 0x20, 0x40, 0x80, 0x40, 0x20, 0x10, 0x08, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0x00, 0xF8, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x80, 0x40, 0x20, 0x10, 0x08, 0x10, 0x20, 0x40, 0x80, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x88, 0x08, 0x10, 0x20, 0x20, 0x00, 0x20, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0xB8, 0xA8, 0xA8, 0xA8, 0xB8, 0x80, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x20, 0x20, 0x50, 0x50, 0x50, 0xF8, 0x88, 0x88, 0x88, 0x00,
+     0x00},
+    {0x00, 0x00, 0xF0, 0x88, 0x88, 0x88, 0xF0, 0x88, 0x88, 0x88, 0xF0, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x80, 0x80, 0x80, 0x80, 0x80, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0xE0, 0x90, 0x88, 0x88, 0x88, 0x88, 0x88, 0x90, 0xE0, 0x00,
+     0x00},
+    {0x00, 0x00, 0xF8, 0x80, 0x80, 0x80, 0xF0, 0x80, 0x80, 0x80, 0xF8, 0x00,
+     0x00},
+    {0x00, 0x00, 0xF8, 0x80, 0x80, 0x80, 0xF0, 0x80, 0x80, 0x80, 0x80, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x80, 0x80, 0xB8, 0x88, 0x88, 0x88, 0x78, 0x00,
+     0x00},
+    {0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0xF8, 0x88, 0x88, 0x88, 0x88, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x88, 0x88, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x88, 0x90, 0xA0, 0xC0, 0xC0, 0xA0, 0x90, 0x88, 0x88, 0x00,
+     0x00},
+    {0x00, 0x00, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0xF8, 0x00,
+     0x00},
+    {0x00, 0x00, 0x88, 0xD8, 0xA8, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x00,
+     0x00},
+    {0x00, 0x00, 0x88, 0xC8, 0xA8, 0x98, 0x88, 0x88, 0x88, 0x88, 0x88, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0xF0, 0x88, 0x88, 0x88, 0xF0, 0x80, 0x80, 0x80, 0x80, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x70, 0x10,
+     0x0C},
+    {0x00, 0x00, 0xF0, 0x88, 0x88, 0x88, 0xF0, 0xA0, 0x90, 0x88, 0x88, 0x00,
+     0x00},
+    {0x00, 0x00, 0x70, 0x88, 0x80, 0x80, 0x70, 0x08, 0x08, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0xF8, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00,
+     0x00},
+    {0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0x50, 0x50, 0x50, 0x20, 0x20, 0x00,
+     0x00},
+    {0x00, 0x00, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, 0x50, 0x50, 0x50, 0x00,
+     0x00},
+    {0x00, 0x00, 0x88, 0x88, 0x50, 0x50, 0x20, 0x50, 0x50, 0x88, 0x88, 0x00,
+     0x00},
+    {0x00, 0x00, 0x88, 0x88, 0x50, 0x50, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00,
+     0x00},
+    {0x00, 0x00, 0xF8, 0x08, 0x10, 0x10, 0x20, 0x40, 0x40, 0x80, 0xF8, 0x00,
+     0x00},
+    {0x00, 0x70, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x70,
+     0x00},
+    {0x00, 0x00, 0x80, 0x80, 0x40, 0x40, 0x20, 0x20, 0x10, 0x10, 0x08, 0x08,
+     0x00},
+    {0x00, 0x70, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x70,
+     0x00},
+    {0x00, 0x20, 0x50, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8,
+     0x00},
+    {0x00, 0x40, 0x40, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x08, 0x78, 0x88, 0x88, 0x78, 0x00,
+     0x00},
+    {0x00, 0x00, 0x80, 0x80, 0x80, 0xF0, 0x88, 0x88, 0x88, 0x88, 0xF0, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x88, 0x80, 0x80, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x08, 0x08, 0x08, 0x78, 0x88, 0x88, 0x88, 0x88, 0x78, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x88, 0xF8, 0x80, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x18, 0x20, 0x20, 0x20, 0xF8, 0x20, 0x20, 0x20, 0x20, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x88, 0x88, 0x88, 0x78, 0x08, 0x88,
+     0x70},
+    {0x00, 0x00, 0x80, 0x80, 0x80, 0xB0, 0xC8, 0x88, 0x88, 0x88, 0x88, 0x00,
+     0x00},
+    {0x00, 0x20, 0x00, 0x00, 0x00, 0x60, 0x20, 0x20, 0x20, 0x20, 0x70, 0x00,
+     0x00},
+    {0x00, 0x10, 0x00, 0x00, 0x00, 0x30, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+     0xE0},
+    {0x00, 0x00, 0x80, 0x80, 0x80, 0x90, 0xA0, 0xC0, 0xA0, 0x90, 0x88, 0x00,
+     0x00},
+    {0x00, 0x00, 0x60, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x30, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0xA8, 0xA8, 0xA8, 0xA8, 0xA8, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0xB0, 0xC8, 0x88, 0x88, 0x88, 0x88, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x88, 0x88, 0x88, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x88, 0x88, 0x88, 0xF0, 0x80, 0x80,
+     0x80},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x88, 0x88, 0x88, 0x78, 0x08, 0x08,
+     0x08},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0xB0, 0xC8, 0x80, 0x80, 0x80, 0x80, 0x00,
+     0x00},
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x88, 0x70, 0x08, 0x88, 0x70, 0x00,
+     0x00},
+    {0x00, 0x00, 0x40, 0x40, 0x40, 0xF0, 0x40, 0x40, 0x40, 0x48, 0x30, 0x00,
+     0x00},
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+    {0x00, 0x20, 0x10, 0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0x98, 0x68, 0x00,
+     0x00},
+    {0x00, 0x10, 0x20, 0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0x98, 0x68, 0x00,
+     0x00},
+    {0x00, 0x30, 0x48, 0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0x98, 0x68, 0x00,
+     0x00},
+    {0x00, 0x50, 0x50, 0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0x98, 0x68, 0x00,
+     0x00},
+    {0x00, 0x10, 0x20, 0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0x78, 0x08, 0x88,
+     0x70},
+    {0x00, 0x00, 0x00, 0x80, 0x80, 0xF0, 0x88, 0x88, 0x88, 0xF0, 0x80, 0x80,
+     0x80},
+    {0x00, 0x50, 0x50, 0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0x78, 0x08, 0x88,
+     0x70}};
\ No newline at end of file
diff --git a/gdt.c b/gdt.c
new file mode 100644
index 0000000..fc8d529
--- /dev/null
+++ b/gdt.c
@@ -0,0 +1,48 @@
+#include <Library/BaseLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PrintLib.h>
+#include <Library/UefiLib.h>
+#include <Uefi.h>
+
+#include "io.h"
+
+UINT64 SegmentDescriptors[] = {
+    0x0000000000000000,  // NULL Descriptor
+    0x00AF9A000000FFFF,  // BaseAddress 0 Granularity 1
+    // SegmentSize 1048575*4069=4294963200(4GB) Segment Present
+    // Plivilege 0 Code Segment Read+Exec
+    0x00CF93000000FFFF  // BaseAddress 0 Granularity 1
+                        // SegmentSize 1048575*4069=4294963200(4GB) Segment
+                        // Present Plivilege 0 Data Segment Read+Write
+};
+IA32_DESCRIPTOR Descriptor;
+
+void sendparallelstub(UINT8 byte) {
+    mapped_io_write(0x378, byte);
+    UINT8 control = mapped_io_read(0x37a);
+    mapped_io_write(0x37a, control | 1);
+    int a;
+    for (int i = 0; i < 200; i++) a += control;
+    mapped_io_write(0x37a, control);
+}
+
+void GDT_init() {
+    Descriptor.Limit = (UINT16)(sizeof(UINT64) * 3 - 1);
+    Descriptor.Base = (UINT32)(UINTN)(VOID *)SegmentDescriptors;
+    AsmWriteGdtr(&Descriptor);
+    asm volatile(
+        "mov $16, %ax\n"
+        "mov %ax, %ss\n"
+        "mov %ax, %ds\n"
+        "mov %ax, %es\n"
+        "mov %ax, %fs\n"
+        "mov %ax, %gs\n"
+        "sub $16,%rsp\n"
+        "leaq end(%rip),%rax\n"
+        "mov %rax,(%rsp)\n"
+        "mov $8,%ax\n"
+        "mov %ax,4(%rsp)\n"
+        "ljmp *(%rsp)\n"
+        "end:\n"
+        "add $16,%rsp");
+}
\ No newline at end of file
diff --git a/gdt.h b/gdt.h
new file mode 100644
index 0000000..e9f575e
--- /dev/null
+++ b/gdt.h
@@ -0,0 +1 @@
+void GDT_init();
\ No newline at end of file
diff --git a/int_handler.s b/int_handler.s
new file mode 100644
index 0000000..b5ce07c
--- /dev/null
+++ b/int_handler.s
@@ -0,0 +1,29 @@
+.global null_handler
+
+null_handler:
+    hlt
+    jmp null_handler
+
+.global kbd_handler
+
+kbd_handler:
+    push %rax
+    push %rcx
+    push %rdx
+    push %rsi
+    push %rdi
+    push %r8
+    push %r9
+    push %r10
+    push %r11
+    call keyboard_int_proc
+    pop %r11
+    pop %r10
+    pop %r9
+    pop %r8
+    pop %rdi
+    pop %rsi
+    pop %rdx
+    pop %rcx
+    pop %rax
+    iretq
\ No newline at end of file
diff --git a/interrupt.c b/interrupt.c
new file mode 100644
index 0000000..7e9c4f6
--- /dev/null
+++ b/interrupt.c
@@ -0,0 +1,122 @@
+#include <Library/BaseLib.h>
+
+#include "io.h"
+#include "text.h"
+#define SPECIAL_SHIFT_L 0b00000001
+#define SPECIAL_SHIFT_R 0b00000010
+#define SPECIAL_CTRL_L 0b00000100
+#define SPECIAL_CTRL_R 0b00001000
+#define SPECIAL_ALT_L 0b00010000
+#define SPECIAL_ALT_R 0b00100000
+#define SPECIAL_SUPER_L 0b01000000
+#define SPECIAL_SUPER_R 0b10000000
+
+void null_handler();
+void kbd_handler();
+IA32_IDT_GATE_DESCRIPTOR descriptors[256];
+
+void descriptor_init() {
+    for (int i = 0; i < 256; i++) {
+        descriptors[i].Bits.Selector = 0x08;
+        descriptors[i].Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32;
+        descriptors[i].Bits.OffsetLow = (UINT32)(UINTN)(VOID *)null_handler;
+        descriptors[i].Bits.OffsetHigh =
+            (UINT32)((UINTN)(VOID *)null_handler >> 16);
+        descriptors[i].Bits.OffsetUpper =
+            (UINT32)((UINTN)(VOID *)null_handler >> 32);
+    }  // null descriptor set
+}
+
+void set_handler(int num, UINTN handler) {
+    descriptors[num].Bits.OffsetLow = (UINT32)handler;
+    descriptors[num].Bits.OffsetHigh = (UINT32)(handler >> 16);
+    descriptors[num].Bits.OffsetUpper = (UINT32)(handler >> 32);
+}
+
+void master_pic_init() {
+    mapped_io_write(0x0020, 0x11);  // ICW1
+    mapped_io_write(0x0021, 32);    // ICW2
+    mapped_io_write(0x0021, 0x04);  // ICW3
+    mapped_io_write(0x0021, 0x01);  // ICW4
+    mapped_io_write(0x0021, 0xFF);  // OCW1
+}
+
+void slave_pic_init() {
+    mapped_io_write(0x00A0, 0x11);
+    mapped_io_write(0x00A1, 40);
+    mapped_io_write(0x00A1, 0x02);
+    mapped_io_write(0x00A1, 0x01);
+    mapped_io_write(0x00A1, 0xff);
+}
+
+void unmask_interrupt(UINT8 interrupt_num) {
+    if (interrupt_num < 40) {
+        UINT8 mask = mapped_io_read(0x0021);
+        mapped_io_write(0x0021, mask & ~(1 << (interrupt_num - 32)));
+    } else {
+        UINT8 mask = mapped_io_read(0x00A1);
+        mapped_io_write(0x00A1, mask & ~(1 << (interrupt_num - 40)));
+    }
+}
+
+void end_of_interrupt(UINT8 interrupt_num) {
+    if (interrupt_num < 40) {
+        mapped_io_write(0x0020, 0x60 | (interrupt_num - 32));
+    } else {
+        mapped_io_write(0x00A0, 0x60 | (interrupt_num - 40));
+    }
+}
+
+void interrupt_init() {
+    IA32_DESCRIPTOR Descriptor;
+    descriptor_init();
+    set_handler(33, (UINTN)(VOID *)kbd_handler);
+    Descriptor.Limit = (UINT16)(sizeof(descriptors) - 1);
+    Descriptor.Base = (UINT32)(UINTN)(VOID *)descriptors;
+    AsmWriteIdtr(&Descriptor);
+    EnableInterrupts();
+    master_pic_init();
+    slave_pic_init();
+    unmask_interrupt(33);
+}
+
+void keyboard_int_proc() {
+    UINT8 data;
+    // static char keyboard_special_keys = 0;
+    data = mapped_io_read(0x64);
+    if ((data & 0b00000001) == 0)  // output buffer is not full
+        goto eoi;
+    data = mapped_io_read(0x60);
+    /*
+    if (data & 0b10000000){  // key is broken
+        switch (data & 0b01111111) {
+            case 44:
+                keyboard_special_keys &= ~SPECIAL_SHIFT_L;
+                return;
+            case 57:
+                keyboard_special_keys &= ~SPECIAL_SHIFT_R;
+                return;
+            case 58:
+                keyboard_special_keys &= ~SPECIAL_CTRL_L;
+                return;
+            case 64:
+                keyboard_special_keys &= ~SPECIAL_CTRL_R;
+                return;
+            case 60:
+                keyboard_special_keys &= ~SPECIAL_ALT_L;
+                return;
+            case 62:
+                keyboard_special_keys &= ~SPECIAL_ALT_R;
+                return;
+            case :
+                keyboard_special_keys &= ~SPECIAL_CTRL_L;
+                return;
+            default:
+                return;
+        }
+    }
+    */
+    textout('0');
+eoi:
+    end_of_interrupt(33);
+}
\ No newline at end of file
diff --git a/interrupt.h b/interrupt.h
new file mode 100644
index 0000000..db2cbe2
--- /dev/null
+++ b/interrupt.h
@@ -0,0 +1 @@
+void interrupt_init();
\ No newline at end of file
diff --git a/io.c b/io.c
new file mode 100644
index 0000000..91b1c0a
--- /dev/null
+++ b/io.c
@@ -0,0 +1,10 @@
+#include "io.h"
+UINT8 mapped_io_read(UINT16 addr) {
+    UINT8 data;
+    asm volatile("inb %1,%0" : "=a"(data) : "d"(addr));
+    return data;
+}
+
+void mapped_io_write(UINT16 addr, UINT8 data) {
+    asm volatile("outb %0,%1" ::"a"(data), "d"(addr));
+}
diff --git a/io.h b/io.h
new file mode 100644
index 0000000..35968ab
--- /dev/null
+++ b/io.h
@@ -0,0 +1,4 @@
+#include <Uefi.h>
+#include <Uefi/UefiSpec.h>
+UINT8 mapped_io_read(UINT16 addr);
+void mapped_io_write(UINT16 addr, UINT8 data);
\ No newline at end of file
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..9c6fbbf
--- /dev/null
+++ b/main.c
@@ -0,0 +1,88 @@
+#include <Library/BaseMemoryLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PrintLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+/*
+#include <Pi/PiMultiPhase.h>
+#include <Protocol/MpService.h>
+*/
+
+#include <Uefi.h>
+#include <Uefi/UefiSpec.h>
+
+#include "fb.h"
+#include "gdt.h"
+#include "interrupt.h"
+#include "text.h"
+
+EFI_STATUS EFIAPI UefiMain(IN EFI_HANDLE ImageHandle,
+                           IN EFI_SYSTEM_TABLE *SystemTable) {
+    EFI_STATUS Status;
+    EFI_GRAPHICS_OUTPUT_PROTOCOL *gop;
+    EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *fsp;
+    // EFI_MP_SERVICES_PROTOCOL *mps;
+
+    SystemTable->BootServices->SetWatchdogTimer(
+        0, 0, 0, NULL);  // Disable watch dog timer
+
+    Status = SystemTable->BootServices->LocateProtocol(
+        &gEfiGraphicsOutputProtocolGuid, NULL,
+        (VOID **)&gop);  // Get GOP Protocol
+    if (EFI_ERROR(Status)) {
+        Print(L"Error:Failed to locate EFI Graphics Output Protocol - %r",
+              Status);
+        return Status;
+    }
+
+    Status = SystemTable->BootServices->LocateProtocol(
+        &gEfiSimpleFileSystemProtocolGuid, NULL, (VOID **)&fsp);
+    if (EFI_ERROR(Status)) {
+        Print(L"Error:Failed to locate EFI Simple FileSystem Protocol - %r",
+              Status);
+        return Status;
+    }
+
+    /*
+        Status = SystemTable->BootServices->LocateProtocol(
+            &gEfiMpServiceProtocolGuid, NULL,
+            (VOID **)&mps);  // Get MultiProcessor Protocol
+        if (EFI_ERROR(Status)) {
+            Print(L"Error:Failed to locate EFI MP Services Protocol - %r",
+       Status); return Status;
+        }
+    */
+
+    FrameBuffer_init(gop);
+    UINTN MemoryMapSize = 1, MapKey, DescriptorSize;
+    UINT32 DescriptorVersion;
+    do {
+        EFI_MEMORY_DESCRIPTOR *mem_desc =
+            (EFI_MEMORY_DESCRIPTOR *)AllocatePool(MemoryMapSize);
+        Status = SystemTable->BootServices->GetMemoryMap(
+            &MemoryMapSize, mem_desc, &MapKey, &DescriptorSize,
+            &DescriptorVersion);
+        if (EFI_ERROR(Status)) continue;
+        Status =
+            SystemTable->BootServices->ExitBootServices(ImageHandle, MapKey);
+    } while (EFI_ERROR(Status));
+    GDT_init();
+    interrupt_init();
+    for (int y = 0; y < buffer.VerticalRes; y++) {
+        for (int x = 0; x < buffer.HorizontalRes; x++) {
+            EFI_GRAPHICS_OUTPUT_BLT_PIXEL *pixel =
+                (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *)buffer.BaseAddress +
+                (buffer.HorizontalRes * y) + x;
+            RGBtoPixel(pixel, 0xFF0000);
+        }
+    }
+    textout('A');
+    textout('p');
+    textout('p');
+    textout('l');
+    textout('e');
+    while (1) asm volatile("hlt");
+    return Status;
+}
\ No newline at end of file
diff --git a/sprinkleos.dec b/sprinkleos.dec
new file mode 100644
index 0000000..04f89d2
--- /dev/null
+++ b/sprinkleos.dec
@@ -0,0 +1,5 @@
+[Defines]
+  DEC_SPECIFICATION              = 0x00010005
+  PACKAGE_NAME                   = sprinkleos
+  PACKAGE_GUID                   = c6ef5994-becc-4b31-8bb9-9746211704b9
+  PACKAGE_VERSION                = 0.1
\ No newline at end of file
diff --git a/sprinkleos.dsc b/sprinkleos.dsc
new file mode 100644
index 0000000..262c516
--- /dev/null
+++ b/sprinkleos.dsc
@@ -0,0 +1,35 @@
+[Defines]
+  PLATFORM_NAME                  = sprinkleos
+  PLATFORM_GUID                  = a285f937-1da6-4f62-ba24-a5b8ec562189
+  PLATFORM_VERSION               = 0.1
+  DSC_SPECIFICATION              = 0x00010005
+  OUTPUT_DIRECTORY               = Build/SprinkleOS$(ARCH)
+  SUPPORTED_ARCHITECTURES        = X64
+  BUILD_TARGETS                  = DEBUG|RELEASE|NOOPT
+
+  DEFINE DEBUG_ENABLE_OUTPUT     = FALSE
+
+[LibraryClasses]
+  # Entry point
+  UefiApplicationEntryPoint|MdePkg/Library/UefiApplicationEntryPoint/UefiApplicationEntryPoint.inf
+
+  # Common Libraries
+  BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
+  BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
+  PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
+  UefiBootServicesTableLib|MdePkg/Library/UefiBootServicesTableLib/UefiBootServicesTableLib.inf
+  !if $(DEBUG_ENABLE_OUTPUT)
+    DebugLib|MdePkg/Library/UefiDebugLibConOut/UefiDebugLibConOut.inf
+    DebugPrintErrorLevelLib|MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
+  !else   ## DEBUG_ENABLE_OUTPUT
+    DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
+  !endif  ## DEBUG_ENABLE_OUTPUT
+
+  UefiLib|MdePkg/Library/UefiLib/UefiLib.inf
+  PrintLib|MdePkg/Library/BasePrintLib/BasePrintLib.inf
+  MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
+  UefiRuntimeServicesTableLib|MdePkg/Library/UefiRuntimeServicesTableLib/UefiRuntimeServicesTableLib.inf
+  DevicePathLib|MdePkg/Library/UefiDevicePathLib/UefiDevicePathLib.inf
+
+[Components]
+  sprinkleos/sprinkleos.inf
\ No newline at end of file
diff --git a/sprinkleos.inf b/sprinkleos.inf
new file mode 100644
index 0000000..017a210
--- /dev/null
+++ b/sprinkleos.inf
@@ -0,0 +1,23 @@
+[Defines]
+  INF_VERSION                    = 0x00010006
+  BASE_NAME                      = sprinkleos
+  FILE_GUID                      = 26213998-6ebc-422b-b917-a396a364fb81
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 0.1
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  main.c
+  fb.c
+  gdt.c
+  interrupt.c
+  io.c
+  text.c
+  int_handler.s
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiLib
+  UefiApplicationEntryPoint
\ No newline at end of file
diff --git a/text.c b/text.c
new file mode 100644
index 0000000..b38780f
--- /dev/null
+++ b/text.c
@@ -0,0 +1,76 @@
+#include "text.h"
+
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PrintLib.h>
+#include <Protocol/SimpleFileSystem.h>
+
+#include "fb.h"
+#include "font.h"
+/*
+char keycode[] = {
+0x0,
+};
+*/
+/*
+void textinit(EFI_SIMPLE_FILE_SYSTEM_PROTOCOL* fsp) {
+    EFI_FILE_PROTOCOL *root, *file;
+
+    EFI_STATUS Status = fsp->OpenVolume(fsp, &root);
+    if (EFI_ERROR(Status)) {
+        Print(L"Error:Failed to open root filesystem - %r", Status);
+        return;
+    }
+
+    Status = root->Open(root, &file, L"font.bdf", EFI_FILE_MODE_READ,
+                        EFI_FILE_READ_ONLY);
+    if (EFI_ERROR(Status)) {
+        Print(L"Error:Failed to open font file - %r", Status);
+        return;
+    }
+    UINTN buf_size = 1;
+    char* fontfiledata = AllocateRuntimeZeroPool(buf_size);
+    if (!fontfiledata) {
+        Print(L"Error:Failed to allocate font memory");
+        return;
+    }
+
+    Status = file->Read(file, &buf_size, (VOID*)fontfiledata);
+    if (Status == EFI_BUFFER_TOO_SMALL) {
+        FreePool(fontfiledata);
+        fontfiledata = AllocateRuntimeZeroPool(buf_size);
+        if (!fontfiledata) {
+            Print(L"Error:Failed to allocate font memory");
+            return;
+        }
+        Status = file->Read(file, &buf_size, (VOID*)fontfiledata);
+        if (EFI_ERROR(Status)) {
+            Print(L"Error:Failed to read font file - %r", Status);
+            return;
+        }
+    } else if (EFI_ERROR(Status)) {
+        Print(L"Error:Failed to read font file - %r", Status);
+        return;
+    }
+    file->Close(file);
+    root->Close(root);
+}*/
+
+void textout(UINT8 code) {
+    static UINTN x = 0, y = 0;
+    for (int row = 0; row < 13; row++) {
+        for (int column = 0; column < 8; column++) {
+            EFI_GRAPHICS_OUTPUT_BLT_PIXEL *pixel =
+                (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *)buffer.BaseAddress +
+                y * 13 * buffer.HorizontalRes + row * buffer.HorizontalRes +
+                8 * x + column;
+            if ((font[code][row] >> (7 - column)) & 0x1)
+                RGBtoPixel(pixel, 0x00FF00);
+        }
+    }
+    if (x < (buffer.HorizontalRes / 8) - 1)
+        x++;
+    else if (y < buffer.VerticalRes / 13) {
+        x = 0;
+        y++;
+    }
+}
\ No newline at end of file
diff --git a/text.h b/text.h
new file mode 100644
index 0000000..605f875
--- /dev/null
+++ b/text.h
@@ -0,0 +1,6 @@
+#include <Protocol/SimpleFileSystem.h>
+#include <Uefi.h>
+#include <Uefi/UefiSpec.h>
+// extern char keycode[];
+
+void textout(UINT8 code);
\ No newline at end of file