feat: setup structure for block devices

added ide block device
added mbr block device driver
started fat block device driver

reordered boot
start timer before pci/ide/etc.
enable interrupts earlier

fixed exception from ide controller

cleanup code
more printfs

kernel/libc/kprintf.c

@@ -74,11 +74,22 @@ u32 vasprintf(char *buf, const char *fmt, va_list args) {
     return ptr;
 }
 
-void printf(const char *fmt, ...) {
+int printf(const char *fmt, ...) {
+    int result;
     char buf[1024] = {-1};
     va_list args;
     va_start(args, fmt);
-    vasprintf(buf, fmt, args);
+    result = vasprintf(buf, fmt, args);
     va_end(args);
     kprint(buf);
+    return result;
 }
+
+int sprintf(char* target, const char*fmt, ...) {
+    int result;
+    va_list args;
+    va_start(args, fmt);
+    result = vasprintf(target, fmt, args);
+    va_end(args);
+    return result;
+}