From b513f2f332a74e3c56f10256da6b930bda9f16ad Mon Sep 17 00:00:00 2001
From: Achilleas Anagnostopoulos <achilleas.imap.mbox@gmail.com>
Date: Thu, 23 Mar 2017 08:01:47 +0000
Subject: [PATCH] Define console interface

---
 kernel/driver/video/console/console.go | 52 ++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 kernel/driver/video/console/console.go

diff --git a/kernel/driver/video/console/console.go b/kernel/driver/video/console/console.go
new file mode 100644
index 0000000..b041fcc
--- /dev/null
+++ b/kernel/driver/video/console/console.go
@@ -0,0 +1,52 @@
+package console
+
+import "sync"
+
+// Attr defines a color attribute.
+type Attr uint16
+
+// The set of attributes that can be passed to Write().
+const (
+	Black Attr = iota
+	Blue
+	Green
+	Cyan
+	Red
+	Magenta
+	Brown
+	LightGrey
+	Grey
+	LightBlue
+	LightGreen
+	LightCyan
+	LightRed
+	LightMagenta
+	LightBrown
+	White
+)
+
+// ScrollDir defines a scroll direction.
+type ScrollDir uint8
+
+// The supported list of scroll directions for the console Scroll() calls.
+const (
+	Up ScrollDir = iota
+	Down
+)
+
+// The console.Interface is implemented by objects that can function as physical consoles.
+type Interface interface {
+	sync.Locker
+
+	// Dimensions returns the width and height of the console in characters.
+	Dimensions() (uint16, uint16)
+
+	// Clear clears the specified rectangular region
+	Clear(x, y, width, height uint16)
+
+	// Scroll a particular number of lines to the specified direction.
+	Scroll(dir ScrollDir, lines uint16)
+
+	// Write a char to the specified location.
+	Write(ch byte, attr Attr, x, y uint16)
+}