[console] Allow console input and output to be disabled independently

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/i386/core/video_subr.c

@@ -104,7 +104,7 @@ static void vga_putc(int byte)
 
 struct console_driver vga_console __console_driver = {
 	.putchar = vga_putc,
-	.disabled = 1,
+	.disabled = CONSOLE_DISABLED,
 	.usage = CONSOLE_DIRECT_VGA,
 };
 

src/arch/i386/interface/vmware/vmconsole.c

@@ -102,7 +102,7 @@ static void vmconsole_putchar ( int character ) {
 /** VMware logfile console driver */
 struct console_driver vmconsole __console_driver = {
 	.putchar = vmconsole_putchar,
-	.disabled = 1,
+	.disabled = CONSOLE_DISABLED,
 	.usage = CONSOLE_VMWARE,
 };
 

src/arch/x86/core/debugcon.c

@@ -74,7 +74,7 @@ static void debugcon_init ( void ) {
 	check = inb ( DEBUG_PORT );
 	if ( check != DEBUG_PORT_CHECK ) {
 		DBG ( "Debug port not present; disabling console\n" );
-		debugcon_console.disabled = 1;
+		debugcon_console.disabled = CONSOLE_DISABLED;
 	}
 }