[fix] Better color?

kernel/main.cpp

@@ -94,30 +94,6 @@ extern "C" void kernel_main() {
     serial_write("Sylva: init heap...\n");
     init_heap();
 
-    // test kmalloc/kfree
-    serial_write("Sylva: kmalloc test...\n");
-    void* p1 = kmalloc(64);
-    void* p2 = kmalloc(128);
-    void* p3 = kmalloc(256);
-    serial_write("Sylva: p1 = ");
-    serial_write_hex((UINTN)p1);
-    serial_write("  p2 = ");
-    serial_write_hex((UINTN)p2);
-    serial_write("  p3 = ");
-    serial_write_hex((UINTN)p3);
-    serial_write("\n");
-
-    serial_write("Sylva: kfree test...\n");
-    kfree(p2);
-    kfree(p1);
-    kfree(p3);
-
-    void* p4 = kmalloc(32);
-    serial_write("Sylva: realloc p4 = ");
-    serial_write_hex((UINTN)p4);
-    serial_write("\n");
-    kfree(p4);
-
     serial_write("Sylva: memory init done.\n");
 
     serial_write("Sylva: FS init...\n");
@@ -129,10 +105,10 @@ extern "C" void kernel_main() {
         fs_list();
     }
 
-    pf_print("Welcome to Sylva OS!\n");
     serial_write(" Kernel prepared well.\n");
 
     prepare((UINT32) g_gfx.vr, (UINT32) g_gfx.hr);
+    pf_print("Hello from SylvaOS!", 100, 100);
 
     // --- Interrupt infrastructure ---
     serial_write("Sylva: init GDT...\n");
@@ -155,37 +131,7 @@ extern "C" void kernel_main() {
     ASM("sti");
     serial_write("Sylva: interrupts enabled\n");
 
-    // --- Multitasking demo ---
-    serial_write("Sylva: creating tasks...\n");
-
-    // Task A: prints messages — preemption handles time slicing
-    task_create("taskA", []() {
-        for (int i = 0; i < 10; i++) {
-            serial_write("[taskA] running iteration ");
-            serial_write_hex(i);
-            serial_write("\n");
-            for (volatile int j = 0; j < 50000000; j++) {}
-        }
-        serial_write("[taskA] done\n");
-    });
-
-    // Task B: prints messages
-    task_create("taskB", []() {
-        for (int i = 0; i < 5; i++) {
-            serial_write("[taskB] hello from taskB #");
-            serial_write_hex(i);
-            serial_write("\n");
-            for (volatile int j = 0; j < 50000000; j++) {}
-        }
-        serial_write("[taskB] done\n");
-    });
-
-    // Task C: short task
-    task_create("taskC", []() {
-        serial_write("[taskC] quick task\n");
-        for (volatile int j = 0; j < 50000000; j++) {}
-        serial_write("[taskC] finished\n");
-    });
+    // 现在还没有任何tasks
 
     serial_write("Sylva: starting preemptive scheduler\n");
     scheduler_run();  // never returns