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/cpu/isr.c

@@ -3,11 +3,11 @@
 //
 
 #include "isr.h"
-#include <kprint.h>
 
 #include <cpu/idt.h>
 #include <libc/libc.h>
 #include <drivers/ports.h>
+#include <libc/kprintf.h>
 
 #define PIC_END_OF_INTERRUPT 0x20
 
@@ -119,13 +119,7 @@ char *exception_messages[] = {
 };
 
 void isr_handler(registers_t r) {
-    kprint("received interrupt: ");
-    char s[3];
-    itoa(r.int_no, s, 10);
-    kprint(s);
-    kprint("\n");
-    kprint(exception_messages[r.int_no]);
-    kprint("\n");
+    printf("Received interrupt: %d - %s\n", r.int_no, exception_messages[r.int_no]);
 }
 
 void register_interrupt_handler(u8 n, isr_t handler) {

kernel/cpu/timer.c

@@ -40,7 +40,7 @@ static void timer_callback(registers_t regs) {
 
 void sleep(u32 milliseconds) {
     u32 done = tick + milliseconds;
-    while (done != milliseconds) {
+    while (tick != done) {
         k_wait_for_interrupt();
     }
 }