126 lines
3 KiB
ArmAsm
126 lines
3 KiB
ArmAsm
/* startup.S - Startup code for the MIPS. */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2009 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/>.
|
|
*/
|
|
|
|
#include <grub/symbol.h>
|
|
#include <grub/cpu/kernel.h>
|
|
#include <grub/machine/memory.h>
|
|
|
|
#define BASE_ADDR 8
|
|
|
|
.extern __bss_start
|
|
.extern _end
|
|
|
|
.globl __start, _start, start
|
|
__start:
|
|
_start:
|
|
start:
|
|
bal codestart
|
|
. = _start + GRUB_KERNEL_CPU_COMPRESSED_SIZE
|
|
compressed_size:
|
|
.long 0
|
|
. = _start + GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE
|
|
total_module_size:
|
|
.long 0
|
|
. = _start + GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE
|
|
kernel_image_size:
|
|
.long 0
|
|
codestart:
|
|
/* Decompress the payload. */
|
|
move $t9, $ra
|
|
addiu $t2, $t9, GRUB_KERNEL_CPU_RAW_SIZE - BASE_ADDR
|
|
lui $t1, %hi(compressed)
|
|
addiu $t1, %lo(compressed)
|
|
lw $t3, (GRUB_KERNEL_CPU_COMPRESSED_SIZE - BASE_ADDR)($t9)
|
|
|
|
/* $t2 contains source compressed address, $t1 is destination,
|
|
$t3 is compressed size. FIXME: put LZMA here. Don't clober $t9
|
|
*/
|
|
reloccont:
|
|
lb $t4, 0($t2)
|
|
sb $t4, 0($t1)
|
|
addiu $t1,$t1,1
|
|
addiu $t2,$t2,1
|
|
addiu $t3, 0xffff
|
|
bne $t3, $0, reloccont
|
|
|
|
/* Move the modules out of BSS. */
|
|
lui $t1, %hi(_start)
|
|
addiu $t1, %lo(_start)
|
|
lw $t2, (GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE - BASE_ADDR)($t9)
|
|
addu $t2, $t1, $t2
|
|
|
|
lui $t1, %hi(_end)
|
|
addiu $t1, %lo(_end)
|
|
addiu $t1, (GRUB_MOD_ALIGN-1)
|
|
li $t3, (GRUB_MOD_ALIGN-1)
|
|
nor $t3, $t3, $0
|
|
and $t1, $t1, $t3
|
|
/* Pass modules address as first argument. */
|
|
// move $a0, $t1
|
|
|
|
lw $t3, (GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE - BASE_ADDR)($t9)
|
|
|
|
/* Backward copy. */
|
|
add $t1, $t1, $t3
|
|
add $t2, $t2, $t3
|
|
addiu $t1, $t1, 0xffff
|
|
addiu $t2, $t2, 0xffff
|
|
|
|
/* $t2 is source. $t1 is destination. $t3 is size. */
|
|
modulesmovcont:
|
|
lb $t4, 0($t2)
|
|
sb $t4, 0($t1)
|
|
addiu $t1,$t1,0xffff
|
|
addiu $t2,$t2,0xffff
|
|
addiu $t3, 0xffff
|
|
bne $t3, $0, modulesmovcont
|
|
|
|
/* Clean BSS. */
|
|
|
|
lui $t1, %hi(__bss_start)
|
|
addiu $t1, %lo(__bss_start)
|
|
lui $t2, %hi(_end)
|
|
addiu $t2, %lo(_end)
|
|
bsscont:
|
|
sb $0,0($t1)
|
|
addiu $t1,$t1,1
|
|
sltu $t3,$t1,$t2
|
|
bne $t3, $0, bsscont
|
|
|
|
li $sp, GRUB_MACHINE_MEMORY_STACK_HIGH
|
|
lui $t1, %hi(grub_main)
|
|
addiu $t1, %lo(grub_main)
|
|
|
|
#if __mips >= 2
|
|
sync
|
|
#endif
|
|
jr $t1
|
|
|
|
. = _start + GRUB_KERNEL_CPU_RAW_SIZE
|
|
compressed:
|
|
. = _start + GRUB_KERNEL_CPU_PREFIX
|
|
|
|
VARIABLE(grub_prefix)
|
|
/* to be filled by grub-mkelfimage */
|
|
|
|
/*
|
|
* Leave some breathing room for the prefix.
|
|
*/
|
|
|
|
. = _start + GRUB_KERNEL_CPU_DATA_END
|