Remove all locking code

Since the Go runtime is not yet setup there is no support for
spinlocking if a lock cannot be acquired. This makes the locking code
useless for now.

kernel/driver/tty/vt.go

@@ -12,7 +12,7 @@ const (
 type Vt struct {
 	// Go interfaces will not work before we can get memory allocation working.
 	// Till then we need to use concrete types instead.
-	cons *console.Vga
+	cons *console.Ega
 
 	width  uint16
 	height uint16
@@ -22,7 +22,9 @@ type Vt struct {
 	curAttr console.Attr
 }
 
-func (t *Vt) Init(cons *console.Vga) {
+// AttachTo links the terminal with the specified console device and updates
+// the terminal's dimensions to match the ones reported by the attached device.
+func (t *Vt) AttachTo(cons *console.Ega) {
 	t.cons = cons
 	t.width, t.height = cons.Dimensions()
 	t.curX = 0
@@ -30,30 +32,20 @@ func (t *Vt) Init(cons *console.Vga) {
 
 	// Default to lightgrey on black text.
 	t.curAttr = makeAttr(defaultFg, defaultBg)
-
 }
 
 // Clear clears the terminal.
 func (t *Vt) Clear() {
-	t.cons.Lock()
-	defer t.cons.Unlock()
-
 	t.clear()
 }
 
 // Position returns the current cursor position (x, y).
 func (t *Vt) Position() (uint16, uint16) {
-	t.cons.Lock()
-	defer t.cons.Unlock()
-
 	return t.curX, t.curY
 }
 
 // SetPosition sets the current cursor position to (x,y).
 func (t *Vt) SetPosition(x, y uint16) {
-	t.cons.Lock()
-	defer t.cons.Unlock()
-
 	if x >= t.width {
 		x = t.width - 1
 	}
@@ -67,9 +59,6 @@ func (t *Vt) SetPosition(x, y uint16) {
 
 // Write implements io.Writer.
 func (t *Vt) Write(data []byte) (int, error) {
-	t.cons.Lock()
-	defer t.cons.Unlock()
-
 	attr := t.curAttr
 	for _, b := range data {
 		switch b {

kernel/driver/tty/vt_test.go

@@ -2,6 +2,7 @@ package tty
 
 import (
 	"testing"
+	"unsafe"
 
 	"github.com/achilleasa/gopher-os/kernel/driver/video/console"
 )
@@ -18,11 +19,12 @@ func TestVtPosition(t *testing.T) {
 		{100, 100, 79, 24},
 	}
 
-	var cons console.Vga
+	fb := make([]uint16, 80*25)
-	cons.Init()
+	var cons console.Ega
+	cons.Init(80, 25, uintptr(unsafe.Pointer(&fb[0])))
 
 	var vt Vt
-	vt.Init(&cons)
+	vt.AttachTo(&cons)
 
 	for specIndex, spec := range specs {
 		vt.SetPosition(spec.inX, spec.inY)
@@ -34,12 +36,11 @@ func TestVtPosition(t *testing.T) {
 
 func TestWrite(t *testing.T) {
 	fb := make([]uint16, 80*25)
-	cons := &console.Vga{}
+	var cons console.Ega
-	cons.OverrideFb(fb)
+	cons.Init(80, 25, uintptr(unsafe.Pointer(&fb[0])))
-	cons.Init()
 
 	var vt Vt
-	vt.Init(cons)
+	vt.AttachTo(&cons)
 
 	vt.Clear()
 	vt.SetPosition(0, 1)

kernel/driver/video/console/console.go

@@ -1,7 +1,5 @@
 package console
 
-import "sync"
-
 // Attr defines a color attribute.
 type Attr uint16
 
@@ -36,8 +34,6 @@ const (
 
 // The Console interface is implemented by objects that can function as physical consoles.
 type Console interface {
-	sync.Locker
-
 	// Dimensions returns the width and height of the console in characters.
 	Dimensions() (uint16, uint16)
 

kernel/driver/video/console/ega.go

@@ -2,7 +2,6 @@ package console
 
 import (
 	"reflect"
-	"sync"
 	"unsafe"
 )
 
@@ -16,8 +15,6 @@ const (
 // allocator, each console will use its own framebuffer while the active console
 // will periodically sync its internal buffer with the physical screen buffer.
 type Ega struct {
-	sync.Mutex
-
 	width  uint16
 	height uint16