rename _start -> hos_start

src/boot.S

@@ -4,9 +4,9 @@ bootloader will jump to this position once the kernel has been loaded. It
 doesn't make sense to return from this function as the bootloader is gone.
 */
 .section .text
-.global _start
-.type _start, @function
-_start:
+.global hos_start
+.type hos_start, @function
+hos_start:
     mov $_stack_end, %esp
  
     /*
@@ -38,8 +38,4 @@ _start:
 1:  hlt
     jmp 1b
  
-/*
-Set the size of the _start symbol to the current location '.' minus its start.
-This is useful when debugging or when you implement call tracing.
-*/
-.size _start, . - _start
+.size hos_start, . - hos_start

src/link.ld

@@ -1,4 +1,4 @@
-ENTRY(_start)
+ENTRY(hos_start)
 
 SECTIONS
 {