Add runtime testing harness

src/kernel/arch/x86/gdt.zig

@@ -305,4 +305,5 @@ pub fn init() void {
 
     // Load the TSS
     arch.ltr();
+    log.logInfo("Done\n");
 }

src/kernel/arch/x86/idt.zig

@@ -122,4 +122,5 @@ pub fn closeInterruptGate(index: u8) void {
 pub fn init() void {
     log.logInfo("Init idt\n");
     arch.lidt(&idt_ptr);
+    log.logInfo("Done\n");
 }

src/kernel/arch/x86/pit.zig

@@ -273,6 +273,7 @@ pub fn getFrequency() u32 {
 /// Initialise the PIT with a handler to IRQ 0.
 ///
 pub fn init() void {
+    log.logInfo("Init pit\n");
     // Set up counter 0 at 1000hz in a square wave mode counting in binary
     const f: u32 = 10000;
     setupCounter(OCW_SELECT_COUNTER_0, f, OCW_MODE_SQUARE_WAVE_GENERATOR | OCW_BINARY_COUNT_BINARY);
@@ -281,4 +282,5 @@ pub fn init() void {
 
     // Installs 'pitHandler' to IRQ0 (pic.IRQ_PIT)
     irq.registerIrq(pic.IRQ_PIT, pitHandler);
+    log.logInfo("Done\n");
 }

src/kernel/kmain.zig

@@ -32,10 +32,11 @@ pub export fn kmain(mb_info: *multiboot.multiboot_info_t, mb_magic: u32) void {
 
         log.logInfo("Init arch " ++ @tagName(builtin.arch) ++ "\n");
         arch.init(&mem_profile, &fixed_allocator.allocator);
+        log.logInfo("Arch init done\n");
         vga.init();
         tty.init();
 
-        log.logInfo("Finished init\n");
+        log.logInfo("Init done\n");
         tty.print("Hello Pluto from kernel :)\n");
     }
 }

src/kernel/tty.zig

@@ -644,6 +644,7 @@ pub fn init() void {
     printLogo();
     displayPageNumber();
     updateCursor();
+    log.logInfo("Done\n");
 }
 
 fn resetGlobals() void {