Changeset 41d33ac in mainline for genarch/src/i8042/i8042.c

Timestamp:

2006-05-31T22:18:40Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

e7ed9868

Parents:

018f95a

Message:

Added syscall that lets kernel regain access to keyboard.

File:

• genarch/src/i8042/i8042.c (modified) (2 diffs)

genarch/src/i8042/i8042.c

@@ -268 +268 @@
 static void i8042_wait(void);
 
-/** Initialize i8042. */
-void i8042_init(void)
-{
-        int i;
-
-        exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt);
+static iroutine oldvector;
+/** Initialize keyboard and service interrupts using kernel routine */
+void i8042_grab(void)
+{
+        oldvector = exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt);
         i8042_wait();
         i8042_command_write(i8042_SET_COMMAND);
@@ -279 +278 @@
         i8042_data_write(i8042_COMMAND);
         i8042_wait();
+}
+/** Resume the former interrupt vector */
+void i8042_release(void)
+{
+        if (oldvector)
+                exc_register(VECTOR_KBD, "user_interrupt", oldvector);
+}
+
+/** Initialize i8042. */
+void i8042_init(void)
+{
+        int i;
+
+        i8042_grab();
+        /* Prevent user from accidentaly releasing calling i8042_resume
+         * and disabling keyboard 
+         */
+        oldvector = NULL; 
 
         trap_virtual_enable_irqs(1<<IRQ_KBD);