Simplified boot script.

boot.s

@@ -1,58 +1,32 @@
-global start
+; http://wiki.osdev.org/Bare_Bones_with_NASM
-extern kernel_main        ; Allow main() to be called from the assembly code
+MBALIGN  equ  1<<0              ; align loaded modules on page boundaries
-extern start_ctors, end_ctors, start_dtors, end_dtors
+MEMINFO  equ  1<<1              ; provide memory map
- 
+FLAGS    equ  MBALIGN | MEMINFO ; this is the Multiboot 'flag' field
-MODULEALIGN        equ        1<<0
+MAGIC    equ  0x1BADB002        ; 'magic number' lets bootloader find the header
-MEMINFO            equ        1<<1
+CHECKSUM equ -(MAGIC + FLAGS)   ; checksum of above, to prove we are multiboot
-FLAGS              equ        MODULEALIGN | MEMINFO
-MAGIC              equ        0x1BADB002
-CHECKSUM           equ        -(MAGIC + FLAGS)
- 
-section .text      ; Next is the Grub Multiboot Header
 
+section .multiboot
 align 4
-MultiBootHeader:
 	dd MAGIC
 	dd FLAGS
 	dd CHECKSUM
 
-STACKSIZE equ 0x4000  ; 16 KiB if you're wondering
+section .bss
+align 16
+stack_bottom:
+resb 16384 ; 16 KiB
+stack_top:
 
-static_ctors_loop:
+section .text
-   mov ebx, start_ctors
+global _start:function (_start.end - _start)
-   jmp .test
+_start:
-.body:
-   call [ebx]
-   add ebx,4
-.test:
-   cmp ebx, end_ctors
-   jb .body
 
-start:
+	mov esp, stack_top
-       mov esp, STACKSIZE+stack
- 
-       push eax
-       push ebx
 
+	extern kernel_main
 	call kernel_main
 
-static_dtors_loop:
+	cli
-   mov ebx, start_dtors
+.hang:	hlt
-   jmp .test
+	jmp .hang
-.body:
+.end:
-   call [ebx]
-   add ebx,4
-.test:
-   cmp ebx, end_dtors
-   jb .body
- 
- 
-cpuhalt:
-       hlt
-       jmp cpuhalt
- 
-section .bss
-align 32
- 
-stack:
-      resb      STACKSIZE