fix: kernel concurrency, interrupt context, and user VA safety

kernel/src/Drivers/PS2/Keyboard.cpp

@@ -150,7 +150,7 @@ namespace Drivers::PS2::Keyboard {
         Kt::KernelLogStream(Kt::OK, "PS2/KB") << "Keyboard driver initialized";
     }
 
-    void HandleIRQ(uint8_t irq) {
+    void HandleIRQ(uint8_t irq, bool) {
         (void)irq;
         uint8_t scancode = Io::In8(DataPort);
 

kernel/src/Drivers/PS2/Keyboard.hpp

@@ -39,7 +39,7 @@ namespace Drivers::PS2::Keyboard {
     void Initialize();
 
     // Interrupt handler -- called from IRQ dispatch (EOI is sent automatically)
-    void HandleIRQ(uint8_t irq);
+    void HandleIRQ(uint8_t irq, bool fromUser);
 
     // Public interface for consuming key events
     bool IsKeyAvailable();
@@ -52,4 +52,4 @@ namespace Drivers::PS2::Keyboard {
     // Inject a key event from an external source (e.g., USB HID keyboard)
     void InjectKeyEvent(const KeyEvent& event);
 
-};
+};

kernel/src/Drivers/PS2/Mouse.cpp

@@ -109,7 +109,7 @@ namespace Drivers::PS2::Mouse {
         Kt::KernelLogStream(Kt::OK, "PS2/Mouse") << "Mouse driver initialized";
     }
 
-    void HandleIRQ(uint8_t irq) {
+    void HandleIRQ(uint8_t irq, bool) {
         (void)irq;
         uint8_t data = Io::In8(DataPort);
 

kernel/src/Drivers/PS2/Mouse.hpp

@@ -24,7 +24,7 @@ namespace Drivers::PS2::Mouse {
     void Initialize();
 
     // Interrupt handler -- called from IRQ dispatch (EOI is sent automatically)
-    void HandleIRQ(uint8_t irq);
+    void HandleIRQ(uint8_t irq, bool fromUser);
 
     // Public interface
     MouseState GetMouseState();
@@ -42,4 +42,4 @@ namespace Drivers::PS2::Mouse {
     // Inject a mouse report from an external source (e.g., USB HID mouse)
     void InjectMouseReport(uint8_t buttons, int8_t deltaX, int8_t deltaY, int8_t scroll);
 
-};
+};