i386: Add new arch support! (woefully incomplete)

2012-11-15 00:38:10 -05:00
parent c76991b1b5
commit cee0ac7dda
8 changed files with 201 additions and 0 deletions
--- a/arch/i386/start.S
+++ b/arch/i386/start.S
@ -0,0 +1,56 @@
+/*
+    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