ARM: Use the serial port as console for now, as VT100.

* Subclass ConsoleNode as VTConsole
* use it to implement SerialConsole
* Use it as the default console for now to simplify debugging.
VTConsole could probably be factored out into boot/platform/generic/ someday.

src/system/boot/platform/u-boot/console.cpp

@@ -6,6 +6,7 @@
 
 #include "console.h"
 #include "keyboard.h"
+#include "serial.h"
 
 #include <SupportDefs.h>
 #include <util/kernel_cpp.h>
@@ -22,9 +23,25 @@ class Console : public ConsoleNode {
 		virtual ssize_t WriteAt(void *cookie, off_t pos, const void *buffer, size_t bufferSize);
 };
 
+class VTConsole : public ConsoleNode {
+	public:
+		VTConsole();
+		void	ClearScreen();
+		void	SetCursor(int32 x, int32 y);
+		void	SetColor(int32 foreground, int32 background);
+};
+
+class SerialConsole : public VTConsole {
+	public:
+		SerialConsole();
+
+		virtual ssize_t ReadAt(void *cookie, off_t pos, void *buffer, size_t bufferSize);
+		virtual ssize_t WriteAt(void *cookie, off_t pos, const void *buffer, size_t bufferSize);
+};
 
 
 static Console sInput, sOutput;
+static SerialConsole sSerial;
 FILE *stdin, *stdout, *stderr;
 
 
@@ -62,10 +79,82 @@ Console::WriteAt(void *cookie, off_t /*pos*/, const void *buffer, size_t bufferS
 //	#pragma mark -
 
 
+VTConsole::VTConsole()
+	: ConsoleNode()
+{
+}
+
+void
+VTConsole::ClearScreen()
+{
+	WriteAt(NULL, 0LL, "\033E", 2);
+}
+
+
+void
+VTConsole::SetCursor(int32 x, int32 y)
+{
+	char buff[] = "\033Y  ";
+	x = MIN(79,MAX(0,x));
+	y = MIN(24,MAX(0,y));
+	buff[3] += (char)x;
+	buff[2] += (char)y;
+	WriteAt(NULL, 0LL, buff, 4);
+}
+
+
+void
+VTConsole::SetColor(int32 foreground, int32 background)
+{
+	static const char cmap[] = {
+		15, 4, 2, 6, 1, 5, 3, 7,
+		8, 12, 10, 14, 9, 13, 11, 0 };
+	char buff[] = "\033b \033c ";
+
+	if (foreground < 0 && foreground >= 16)
+		return;
+	if (background < 0 && background >= 16)
+		return;
+
+	buff[2] += cmap[foreground];
+	buff[5] += cmap[background];
+	WriteAt(NULL, 0LL, buff, 6);
+}
+
+
+//	#pragma mark -
+
+
+SerialConsole::SerialConsole()
+	: VTConsole()
+{
+}
+
+
+ssize_t
+SerialConsole::ReadAt(void *cookie, off_t pos, void *buffer, size_t bufferSize)
+{
+	// don't seek in character devices
+	// not implemented (and not yet? needed)
+	return B_ERROR;
+}
+
+
+ssize_t
+SerialConsole::WriteAt(void *cookie, off_t /*pos*/, const void *buffer, size_t bufferSize)
+{
+	serial_puts((const char *)buffer, bufferSize);
+	return bufferSize;
+}
+
+
+//	#pragma mark -
+
+
 void
 console_clear_screen(void)
 {
-
+	sSerial.ClearScreen();
 }
 
 
@@ -86,7 +175,7 @@ console_height(void)
 void
 console_set_cursor(int32 x, int32 y)
 {
-
+	sSerial.SetCursor(x, y);
 }
 
 
@@ -105,7 +194,7 @@ console_hide_cursor(void)
 void
 console_set_color(int32 foreground, int32 background)
 {
-
+	sSerial.SetColor(foreground, background);
 }
 
 
@@ -119,6 +208,8 @@ console_wait_for_key(void)
 status_t
 console_init(void)
 {
+	stdin = (FILE *)&sSerial;
+	stdout = stderr = (FILE *)&sSerial;
 	return B_OK;
 }