120 lines
3.1 KiB
ArmAsm
120 lines
3.1 KiB
ArmAsm
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 1999,2000,2001,2002,2003,2005,2006,2007,2008 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB 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 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
/*
|
|
* Note: These functions defined in this file may be called from C.
|
|
* Be careful of that you must not modify some registers. Quote
|
|
* from gcc-2.95.2/gcc/config/i386/i386.h:
|
|
|
|
1 for registers not available across function calls.
|
|
These must include the FIXED_REGISTERS and also any
|
|
registers that can be used without being saved.
|
|
The latter must include the registers where values are returned
|
|
and the register where structure-value addresses are passed.
|
|
Aside from that, you can include as many other registers as you like.
|
|
|
|
ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7,arg
|
|
{ 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
|
|
*/
|
|
|
|
/*
|
|
* Note: GRUB is compiled with the options -mrtd and -mregparm=3.
|
|
* So the first three arguments are passed in %eax, %edx, and %ecx,
|
|
* respectively, and if a function has a fixed number of arguments
|
|
* and the number if greater than three, the function must return
|
|
* with "ret $N" where N is ((the number of arguments) - 3) * 4.
|
|
*/
|
|
|
|
/*
|
|
* This is the area for all of the special variables.
|
|
*/
|
|
|
|
.p2align 2 /* force 4-byte alignment */
|
|
|
|
/*
|
|
* void grub_linux_boot_zimage (void)
|
|
*/
|
|
VARIABLE(grub_linux_prot_size)
|
|
.long 0
|
|
VARIABLE(grub_linux_tmp_addr)
|
|
.long 0
|
|
VARIABLE(grub_linux_real_addr)
|
|
.long 0
|
|
VARIABLE(grub_linux_is_bzimage)
|
|
.long 0
|
|
|
|
FUNCTION(grub_linux16_real_boot)
|
|
/* Must be done before zImage copy. */
|
|
call EXT_C(grub_dl_unload_all)
|
|
|
|
movl EXT_C(grub_linux_is_bzimage), %ebx
|
|
test %ebx, %ebx
|
|
jne bzimage
|
|
|
|
/* copy the kernel */
|
|
movl EXT_C(grub_linux_prot_size), %ecx
|
|
addl $3, %ecx
|
|
shrl $2, %ecx
|
|
movl $GRUB_LINUX_BZIMAGE_ADDR, %esi
|
|
movl $GRUB_LINUX_ZIMAGE_ADDR, %edi
|
|
cld
|
|
rep
|
|
movsl
|
|
|
|
bzimage:
|
|
movl EXT_C(grub_linux_real_addr), %ebx
|
|
|
|
/* copy the real mode code */
|
|
movl EXT_C(grub_linux_tmp_addr), %esi
|
|
movl %ebx, %edi
|
|
movl $GRUB_LINUX_SETUP_MOVE_SIZE, %ecx
|
|
cld
|
|
rep
|
|
movsb
|
|
|
|
/* change %ebx to the segment address */
|
|
shrl $4, %ebx
|
|
movl %ebx, %eax
|
|
addl $0x20, %eax
|
|
movw %ax, linux_setup_seg
|
|
|
|
/* XXX new stack pointer in safe area for calling functions */
|
|
movl $0x4000, %esp
|
|
call EXT_C(grub_stop_floppy)
|
|
|
|
/* final setup for linux boot */
|
|
call prot_to_real
|
|
.code16
|
|
|
|
cli
|
|
movw %bx, %ss
|
|
movw $GRUB_LINUX_SETUP_STACK, %sp
|
|
|
|
movw %bx, %ds
|
|
movw %bx, %es
|
|
movw %bx, %fs
|
|
movw %bx, %gs
|
|
|
|
/* ljmp */
|
|
.byte 0xea
|
|
.word 0
|
|
linux_setup_seg:
|
|
.word 0
|
|
.code32
|
|
|