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/kernel.c

@@ -15,13 +15,16 @@
 #include <drivers/pci.h>
 #include <drivers/ide.h>
 #include <libc/kprintf.h>
+#include <fs/mbr.h>
+#include <fs/blockdev.h>
 
 #define BOOTLOADER_NAME_MAX_LENGTH 64
 #define CMDLINE_MAX_LENGTH 256
 
 const char *msg_booted = "Booted Successfully!\n";
-const char *newline = "\n";
-const char *msg_unknown_command = "Unknown command: ";
+const int version_major = 0,
+    version_minor = 0,
+    version_patch = 1;
 
 char bootloader_name[BOOTLOADER_NAME_MAX_LENGTH];
 char cmdline[CMDLINE_MAX_LENGTH];
@@ -67,8 +70,7 @@ void help(const char* arg) {
 }
 
 void echo(const char *arg) {
-    kprint(arg);
-    kprint(newline);
+    printf("%s\n", arg);
 }
 
 void print(const char *arg) {
@@ -85,19 +87,19 @@ void print(const char *arg) {
     } else if (strcmp(arg, "ide") == 0) {
         ide_print_devices();
     } else {
-        kprint("Unknown print ");
-        kprint(arg);
-        kprint(newline);
+        printf("Unknown print %s\n", arg);
     }
 }
 
 void ide(const char* arg) {
-    if (strcmp(arg, "devices") == 0) {
+    if (strcmp(arg, "block_devices") == 0) {
+        block_dev_print_info();
+    } else if (strcmp(arg, "ide_devices") == 0) {
         ide_print_devices();
+    } else if (strcmp(arg, "mbr") == 0) {
+        mbr_read_from_ide(0);
     } else {
-        kprint("Unknown print ");
-        kprint(arg);
-        kprint(newline);
+        printf("Unknown print %s\n", arg);
     }
 }
 
@@ -142,6 +144,14 @@ void init_pci_system() {
     pci_init_drivers();
 }
 
+void init_block_devices() {
+    // register drivers
+    mbr_register_block_driver();
+
+    // scan
+    block_dev_scan_repeat();
+}
+
 void kmain(multiboot_info_t *multiboot_info) {
     isr_install();
     vga_clear_screen();
@@ -153,22 +163,18 @@ void kmain(multiboot_info_t *multiboot_info) {
     store_bootloader_info(multiboot_info);
     init_mmap(multiboot_info);
 
-    init_pci_system();
-
-    kprint(msg_booted);
-    kprint(newline);
-
     // init done, enable interrupts
     __asm__ __volatile__("sti");
-    // init timer for future task switching
     init_timer(1000);
-    // setup PS/2 keyboard
     init_keyboard();
+    init_pci_system();
+    init_block_devices();
 
+    printf("%s v%d.%d.%d\n", msg_booted, version_major, version_minor, version_patch);
 //    print_gdt();
 
 //    u8* tmp = malloc(4096);
-//    ide_read_access(0, 0, 0, 16, tmp);
+//    ide_access(0, 0, 0, 16, tmp);
 
     // enter main loop
     while (true) {
@@ -183,9 +189,7 @@ void main_loop() {
     int test_index = 0;
     while (true) {
         if (cmd_handlers[test_index].cmd == 0) {
-            kprint(msg_unknown_command);
-            kprint(msg);
-            kprint(newline);
+            printf("Unknown command: %s\n", msg);
             break;
         }
         if (strcmp(cmd_handlers[test_index].cmd, msg) == 0) {