Fix long-standing issues in qemu/bochs

and possibly other environments - fixes the long-standing issue with
keyboard/mouse getting disabled sometimes on bootup, especially if you
tried to interact with the qemu window during the boot process

kernel/devices/kbd.c

@@ -49,7 +49,6 @@ keyboard_handler(
 	scancode = inportb(KEY_DEVICE);
 	irq_ack(KEYBOARD_IRQ);
 
-
 	putch(scancode);
 
 }
@@ -73,6 +72,13 @@ keyboard_install() {
 	bfinish(0);
 }
 
+void keyboard_reset_ps2() {
+	uint8_t tmp = inportb(0x61);
+	outportb(0x61, tmp | 0x80);
+	outportb(0x61, tmp & 0x7F);
+	inportb(KEY_DEVICE);
+}
+
 /*
  * Wait on the keyboard.
  */

kernel/devices/mouse.c

@@ -20,6 +20,7 @@ int8_t  mouse_byte[3];
 #define MOUSE_BBIT   0x01
 #define MOUSE_WRITE  0xD4
 #define MOUSE_F_BIT  0x20
+#define MOUSE_V_BIT  0x08
 
 fs_node_t * mouse_pipe;
 
@@ -66,6 +67,7 @@ void mouse_handler(struct regs *r) {
 			switch (mouse_cycle) {
 				case 0:
 					mouse_byte[0] = mouse_in;
+					if (!(mouse_in & MOUSE_V_BIT)) return;
 					++mouse_cycle;
 					break;
 				case 1:

kernel/include/system.h

@@ -146,6 +146,7 @@ extern void timer_wait(int ticks);
 
 /* Keyboard */
 extern void keyboard_install();
+extern void keyboard_reset_ps2();
 extern void keyboard_wait();
 extern void putch(unsigned char c);
 

kernel/main.c

@@ -134,8 +134,8 @@ int main(struct multiboot *mboot, uint32_t mboot_mag, uintptr_t esp) {
 	shm_install();		/* Install shared memory */
 
 	keyboard_install();	/* Keyboard interrupt handler */
-
 	mouse_install();	/* Mouse driver */
+	keyboard_reset_ps2();
 
 	if (cmdline) {
 		parse_args(cmdline);