x86: support both keyboard input and serial COM1 input

Signed-off-by: Parai Wang <parai@foxmail.com>

bsp/x86/Makefile

@@ -14,4 +14,4 @@ floppy.img:
 	wget https://github.com/bajdcc/tinix/raw/master/floppy.img
 
 run:
-	qemu-system-i386 -fda floppy.img -boot a -m 64M
+	qemu-system-i386 -fda floppy.img -boot a -m 64M -serial stdio

bsp/x86/drivers/console.c

@@ -25,6 +25,10 @@ extern void init_keyboard();
 extern void rt_keyboard_isr(void);
 extern rt_bool_t rt_keyboard_getc(char* c);
 
+extern void rt_serial_init(void);
+extern char rt_serial_getc(void);
+extern void rt_serial_putc(const char c);
+
 static void rt_console_putc(int c);
 
 /**
@@ -126,7 +130,7 @@ static void rt_cga_putc(int c)
 static void rt_console_putc(int c)
 {
     rt_cga_putc(c);
-//    rt_serial_putc(c);
+    rt_serial_putc(c);
 }
 
 /* RT-Thread Device Interface */
@@ -217,9 +221,18 @@ static void rt_console_isr(int vector, void* param)
 	rt_bool_t ret;
     rt_base_t level;
 
-	rt_keyboard_isr();
+	if(INTUART0_RX == vector)
+	{
+		c = rt_serial_getc();
+		ret = RT_TRUE;
+	}
+	else
+	{
+		rt_keyboard_isr();
+
+		ret = rt_keyboard_getc(&c);
+	}
 
-	ret = rt_keyboard_getc(&c);
 	if(ret == RT_FALSE)
 	{
 		/* do nothing */
@@ -275,12 +288,16 @@ static void rt_console_isr(int vector, void* param)
 void rt_hw_console_init(void)
 {
     rt_cga_init();
+	rt_serial_init();
 	init_keyboard();
 
     /* install  keyboard isr */
     rt_hw_interrupt_install(INTKEYBOARD, rt_console_isr, RT_NULL, "kbd");
     rt_hw_interrupt_umask(INTKEYBOARD);
 
+    rt_hw_interrupt_install(INTUART0_RX, rt_console_isr, RT_NULL, "COM1");
+    rt_hw_interrupt_umask(INTUART0_RX);
+
     console_device.type 		= RT_Device_Class_Char;
     console_device.rx_indicate  = RT_NULL;
     console_device.tx_complete  = RT_NULL;

bsp/x86/drivers/serial.c

@@ -17,7 +17,6 @@
 #include <rthw.h>
 
 #include <bsp.h>
-extern char rt_keyboard_getc(void);
 
 /**
  * @addtogroup QEMU
@@ -45,13 +44,11 @@ void rt_serial_init(void)
  */
 char rt_serial_getc(void)
 {
-	return rt_keyboard_getc();
 
-#if 0
 	while(!(inb(COM1+COMSTATUS) & COMDATA));
 	
 	return inb(COM1+COMREAD);
-#endif
+
 }
 
 /**