enter protected mode and jump to rust binary

boot1/link.ld

@@ -4,6 +4,7 @@ OUTPUT_FORMAT("binary")
 
 SECTIONS {
   .prelude : {
+    KEEP(*(.prelude))
     *(.prelude)
   }
   
@@ -27,8 +28,16 @@ SECTIONS {
     *(.rodata.*)
   }
   
+  .magic : {
+    /* Magic bytes the prelude uses to make sure it's loaded the subsequent sectors correctly. */
+    LONG(0x544e4150)
+  }
+
+  boot1_magic = ADDR(.magic);
+
   /* Define a symbol for the total length of the binary, so the prelude knows how many blocks to
    * load from disk.
    */
   boot1_bin_len = . - 0x8200;
+  boot1_bin_sectors = (boot1_bin_len + 511) / 512;
 }