feat: further kernel power and power optimizations

kernel/src/Drivers/PS2/Keyboard.cpp

@@ -13,6 +13,7 @@
 #include <Terminal/Terminal.hpp>
 #include <Hal/Apic/Interrupts.hpp>
 #include <Hal/Apic/IoApic.hpp>
+#include <Drivers/Input/InputEvents.hpp>
 
 namespace Drivers::PS2::Keyboard {
 
@@ -86,14 +87,15 @@ namespace Drivers::PS2::Keyboard {
         return shift ^ caps;
     }
 
-    static void BufferPush(const KeyEvent& event) {
+    static bool BufferPush(const KeyEvent& event) {
         uint32_t nextHead = (g_BufferHead + 1) & (KeyBufferSize - 1);
         if (nextHead == g_BufferTail) {
             // Buffer full, drop the event
-            return;
+            return false;
         }
         g_KeyBuffer[g_BufferHead] = event;
         g_BufferHead = nextHead;
+        return true;
     }
 
     static bool BufferPop(KeyEvent& event) {
@@ -105,6 +107,16 @@ namespace Drivers::PS2::Keyboard {
         return true;
     }
 
+    static void PushAndNotify(const KeyEvent& event) {
+        g_BufferLock.Acquire();
+        bool pushed = BufferPush(event);
+        g_BufferLock.Release();
+
+        if (pushed) {
+            Drivers::InputEvents::NotifyActivity();
+        }
+    }
+
     void Initialize() {
         Kt::KernelLogStream(Kt::INFO, "PS2/KB") << "Initializing keyboard driver";
 
@@ -169,9 +181,7 @@ namespace Drivers::PS2::Keyboard {
                 .Alt      = g_Modifiers.LeftAlt || g_Modifiers.RightAlt,
                 .CapsLock = g_Modifiers.CapsLock
             };
-            g_BufferLock.Acquire();
-            BufferPush(event);
-            g_BufferLock.Release();
+            PushAndNotify(event);
 
             return;
         }
@@ -229,9 +239,7 @@ namespace Drivers::PS2::Keyboard {
                 .Alt      = g_Modifiers.LeftAlt || g_Modifiers.RightAlt,
                 .CapsLock = g_Modifiers.CapsLock
             };
-            g_BufferLock.Acquire();
-            BufferPush(event);
-            g_BufferLock.Release();
+            PushAndNotify(event);
             return;
         }
         if (isModifier) return;
@@ -256,9 +264,7 @@ namespace Drivers::PS2::Keyboard {
             .CapsLock = g_Modifiers.CapsLock
         };
 
-        g_BufferLock.Acquire();
-        BufferPush(event);
-        g_BufferLock.Release();
+        PushAndNotify(event);
     }
 
     bool IsKeyAvailable() {
@@ -292,9 +298,7 @@ namespace Drivers::PS2::Keyboard {
     }
 
     void InjectKeyEvent(const KeyEvent& event) {
-        g_BufferLock.Acquire();
-        BufferPush(event);
-        g_BufferLock.Release();
+        PushAndNotify(event);
     }
 
-};
+};