Replace busy-wait with time-based sleep in sweden.c

src/kernel/cli_apps/cli_utils.c

@@ -1,4 +1,5 @@
 #include "cli_utils.h"
+#include "wm.h"
 
 // Forward declarations - these will be provided by cmd.c
 extern void cmd_putchar(char c);
@@ -78,3 +79,14 @@ void cli_delay(int iterations) {
         __asm__ __volatile__("nop");
     }
 }
+
+void cli_sleep(int ms) {
+    // Timer is ~60Hz, so 1 tick = 16.66ms
+    uint32_t ticks = ms / 16;
+    if (ticks == 0 && ms > 0) ticks = 1;
+    
+    uint32_t target = wm_get_ticks() + ticks;
+    while (wm_get_ticks() < target) {
+        __asm__ __volatile__("hlt");
+    }
+}

src/kernel/cli_apps/cli_utils.h

@@ -19,6 +19,7 @@ void cli_putchar(char c);
 
 // Timing utility
 void cli_delay(int iterations);
+void cli_sleep(int ms);
 
 // CLI Command declarations
 void cli_cmd_shutdown(char *args);

src/kernel/cli_apps/sweden.c

@@ -13,10 +13,10 @@ void play_note(int freq, int duration_ms) {
     }
     
 
-    cli_delay(duration_ms * 300000); 
+    cli_sleep(duration_ms); 
     
     outb(0x61, inb(0x61) & 0xFC);
-    cli_delay(2000000); 
+    cli_sleep(20); 
 }
 
 void cli_cmd_minecraft(char *args) {

src/kernel/wm.c

@@ -1729,6 +1729,10 @@ void wm_init(void) {
     force_redraw = true;
 }
 
+uint32_t wm_get_ticks(void) {
+    return timer_ticks;
+}
+
 // Called by timer interrupt ~60Hz
 void wm_timer_tick(void) {
     timer_ticks++;

src/kernel/wm.h

@@ -54,6 +54,7 @@ void wm_refresh(void);
 void wm_paint(void);
 void wm_refresh_desktop(void);
 void wm_timer_tick(void);
+uint32_t wm_get_ticks(void);
 int wm_get_desktop_icon_count(void);
 void wm_show_message(const char *title, const char *message);