feat: further kernel power and power optimizations

programs/include/Api/Syscall.hpp

@@ -156,6 +156,7 @@ namespace Montauk {
     static constexpr uint64_t SYS_CLIPBOARD_GET_INFO = 120;
     static constexpr uint64_t SYS_CLIPBOARD_GET_TEXT = 121;
     static constexpr uint64_t SYS_CLIPBOARD_CLEAR    = 122;
+    static constexpr uint64_t SYS_INPUT_WAIT          = 123;
 
     static constexpr uint32_t CLIPBOARD_MAX_TEXT_BYTES = 256 * 1024;
 

programs/include/montauk/syscall.h

@@ -177,6 +177,9 @@ namespace montauk {
     inline bool is_key_available() { return (bool)syscall0(Montauk::SYS_ISKEYAVAILABLE); }
     inline void getkey(Montauk::KeyEvent* out) { syscall1(Montauk::SYS_GETKEY, (uint64_t)out); }
     inline char getchar() { return (char)syscall0(Montauk::SYS_GETCHAR); }
+    inline uint64_t input_wait(uint64_t observedSerial, uint64_t timeoutMs) {
+        return (uint64_t)syscall2(Montauk::SYS_INPUT_WAIT, observedSerial, timeoutMs);
+    }
 
     // Networking
     inline int32_t ping(uint32_t ip, uint32_t timeoutMs = 3000) {

programs/src/desktop/main.cpp

@@ -551,6 +551,7 @@ bool desktop_poll_external_windows(DesktopState* ds) {
 void gui::desktop_run(DesktopState* ds) {
     uint64_t lastClockToken = 0;
     uint64_t lastLauncherBlinkToken = ~0ull;
+    uint64_t inputSerial = montauk::input_wait(0, 0);
     bool firstFrame = true;
 
     for (;;) {
@@ -628,11 +629,10 @@ void gui::desktop_run(DesktopState* ds) {
             firstFrame = false;
         }
 
-        if (desktop_has_active_interaction(ds)) {
-            montauk::sleep_ms(1);
-        } else {
-            montauk::sleep_ms(sceneChanged ? 4 : 16);
-        }
+        uint64_t waitMs = (desktop_has_active_interaction(ds) || mouseChanged || keyboardChanged)
+            ? 1
+            : (sceneChanged ? 4 : 16);
+        inputSerial = montauk::input_wait(inputSerial, waitMs);
     }
 }