/*
    Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>

    This file is part of Aedrix.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

.global start /* making entry point visible to linker */

/* setting up the Multiboot header - see GRUB docs for details */
.set ALIGN,    1<<0                     /* align loaded modules on page boundaries */
.set MEMINFO,  1<<1                     /* provide memory map */
.set FLAGS,    ALIGN | MEMINFO          /* this is the Multiboot 'flag' field */
.set MAGIC,    0x1BADB002               /* 'magic number' lets bootloader find the header */
.set CHECKSUM, -(MAGIC + FLAGS)         /* checksum required */

.align 4
.long MAGIC
.long FLAGS
.long CHECKSUM

/* reserve initial kernel stack space */
.set STACKSIZE, 0x4000                  /* that is, 16k. */
.align 32
.lcomm stack, STACKSIZE                 /* reserve 16k stack on a doubleword boundary */
.comm  mbd, 4                           /* we will use this in i386_main */
.comm  magic, 4                         /* we will use this in i386_main */

start:
    movl  $(stack + STACKSIZE), %esp    /* set up the stack */
    movl  %eax, magic                   /* Multiboot magic number */
    movl  %ebx, mbd                     /* Multiboot data structure */

    call  i386_main                     /* call kernel proper */

    cli
hang:
    hlt                                 /* halt machine should kernel return */
    jmp   hang

.globl atags_ptr
atags_ptr:
	.word 0