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|
/* 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/offsets.h>
#include <grub/machine/memory.h>
#include <grub/machine/kernel.h>
#include <grub/offsets.h>
#include <grub/mips/asm.h>
#define BASE_ADDR 8
.extern __bss_start
.extern _end
.extern _edata
.globl __start, _start, start
.set noreorder
.set nomacro
__start:
_start:
start:
bal codestart
nop
base:
.org GRUB_DECOMPRESSOR_MACHINE_COMPRESSED_SIZE
compressed_size:
.long 0
.org GRUB_DECOMPRESSOR_MACHINE_UNCOMPRESSED_SIZE
uncompressed_size:
.long 0
.org GRUB_DECOMPRESSOR_MACHINE_UNCOMPRESSED_ADDR
uncompressed_addr:
.long 0
codestart:
/* Save our base. */
move $s0, $ra
/* Parse arguments. Has to be done before relocation.
So need to do it in asm. */
#ifdef GRUB_MACHINE_MIPS_QEMU_MIPS
lui $t0, %hi (((16 << 20) - 264 + 4) | 0x80000000)
lw $t1, %lo (((16 << 20) - 264 + 4) | 0x80000000) ($t0)
lui $t2, 0x1234
ori $t2, 0x5678
bne $t1, $t2, 1f
nop
lui $t0, %hi (((16 << 20) - 264) | 0x80000000)
b 2f
lw $s4, %lo (((16 << 20) - 264) | 0x80000000) ($t0)
1:
li $s4, 0
2:
#endif
#ifdef GRUB_MACHINE_MIPS_LOONGSON
move $s2, $zero
move $s3, $zero
move $s4, $zero
move $s5, $zero
move $s7, $zero
/* $a2 has the environment. */
addiu $t0, $zero, -0x10
and $t1, $a2, $t0
beq $t0, $t1, argfw
nop
move $t0, $a2
argcont:
lw $t1, 0($t0)
beq $t1, $zero, argdone
nop
#define DO_PARSE(str, reg) \
addiu $t2, $s0, (str-base);\
bal parsestr;\
nop ;\
beq $v0, $zero, 1f;\
nop ;\
b 2f;\
move reg, $v0; \
1:
#define DO_CHECKT1(str, val) \
move $t6, $t1 ;\
addiu $t7, $s0, (str - base);\
bal do_check ;\
li $t2, val
DO_PARSE (busclockstr, $s2)
DO_PARSE (cpuclockstr, $s3)
DO_PARSE (memsizestr, $s4)
DO_PARSE (highmemsizestr, $s5)
DO_CHECKT1 (pmon_yeeloong_verstr, GRUB_ARCH_MACHINE_YEELOONG)
DO_CHECKT1 (pmon_fuloong2f_verstr, GRUB_ARCH_MACHINE_FULOONG2F)
2:
b argcont
addiu $t0, $t0, 4
parsestr:
move $v0, $zero
move $t3, $t1
3:
lb GRUB_ASM_T4, 0($t2)
lb GRUB_ASM_T5, 0($t3)
addiu $t2, $t2, 1
addiu $t3, $t3, 1
beq GRUB_ASM_T5, $zero, 1f
nop
beq GRUB_ASM_T5, GRUB_ASM_T4, 3b
nop
bne GRUB_ASM_T4, $zero, 1f
nop
addiu $t3, $t3, 0xffff
digcont:
lb GRUB_ASM_T5, 0($t3)
/* Substract '0' from digit. */
addiu GRUB_ASM_T5, GRUB_ASM_T5, 0xffd0
bltz GRUB_ASM_T5, 1f
nop
addiu GRUB_ASM_T4, GRUB_ASM_T5, 0xfff7
bgtz GRUB_ASM_T4, 1f
nop
/* Multiply $v0 by 10 with bitshifts. */
sll $v0, $v0, 1
sll GRUB_ASM_T4, $v0, 2
addu $v0, $v0, GRUB_ASM_T4
addu $v0, $v0, GRUB_ASM_T5
addiu $t3, $t3, 1
b digcont
nop
1:
jr $ra
nop
busclockstr: .asciz "busclock="
cpuclockstr: .asciz "cpuclock="
memsizestr: .asciz "memsize="
highmemsizestr: .asciz "highmemsize="
machtype_yeeloong_str1: .asciz "machtype=8.9"
machtype_yeeloong_str2: .asciz "machtype=lemote-yeeloong-"
machtype_fuloong2f_str: .asciz "machtype=lemote-fuloong-2f"
machtype_fuloong2e_str: .asciz "machtype=lemote-fuloong-2e"
pmon_yeeloong_str: .asciz "PMON_VER=LM8"
pmon_fuloong2f_str: .asciz "PMON_VER=LM6"
pmon_yeeloong_verstr: .asciz "Version=LM8"
pmon_fuloong2f_verstr: .asciz "Version=LM6"
.p2align 2
argdone:
beq $a0, $zero, cmdlinedone
nop
#define DO_CHECKA1(str, val) \
lw $t6, 0($a1) ;\
addiu $t7, $s0, (str - base);\
bal do_check ;\
li $t2, val
DO_CHECKA1 (machtype_yeeloong_str1, GRUB_ARCH_MACHINE_YEELOONG)
DO_CHECKA1 (machtype_yeeloong_str2, GRUB_ARCH_MACHINE_YEELOONG)
DO_CHECKA1 (pmon_yeeloong_str, GRUB_ARCH_MACHINE_YEELOONG)
DO_CHECKA1 (machtype_fuloong2f_str, GRUB_ARCH_MACHINE_FULOONG2F)
DO_CHECKA1 (machtype_fuloong2e_str, GRUB_ARCH_MACHINE_FULOONG2E)
DO_CHECKA1 (pmon_fuloong2f_str, GRUB_ARCH_MACHINE_FULOONG2F)
addiu $a0, $a0, -1
b argdone
addiu $a1, $a1, 4
do_check:
lb GRUB_ASM_T4, 0($t7)
beq GRUB_ASM_T4, $zero, 1f
lb $t3, 0($t6)
bne $t3, GRUB_ASM_T4, 2f
addiu $t6, $t6, 1
b do_check
addiu $t7, $t7, 1
1:
move $s7, $t2
2:
jr $ra
nop
argfw:
not $s7, $a2
cmdlinedone:
#endif
#ifdef GRUB_MACHINE_ARC
lui $t0, %hi(_start - 256)
addiu $t0, $t0, %lo(_start - 256)
addiu $t3, $t0, 255
lw $t1, 0($a1)
1:
bne $t0, $t3, 2f
lb $t2, 0($t1)
move $t2, $zero
2:
sb $t2, 0($t0)
addiu $t0, $t0, 1
bnez $t2, 1b
addiu $t1, $t1, 1
#endif
/* Copy the decompressor. */
lui $t1, %hi(base)
addiu $t1, $t1, %lo(base)
lui $t3, %hi(__bss_start)
addiu $t3, $t3, %lo(__bss_start)
move $t2, $s0
1:
beq $t1, $t3, 2f
lb GRUB_ASM_T4, 0($t2)
sb GRUB_ASM_T4, 0($t1)
addiu $t1, $t1, 1
b 1b
addiu $t2, $t2, 1
2:
/* Clean out its BSS. */
lui $t1, %hi(__bss_start)
addiu $t1, $t1, %lo(__bss_start)
lui $t2, %hi(_end)
addiu $t2, $t2, %lo(_end)
1:
beq $t1, $t2, 2f
nop
sb $zero, 0($t1)
b 1b
addiu $t1, $t1, 1
2:
lui $a0, %hi(base)
addiu $a0, $a0, %lo(base)
lui $a1, %hi(_end)
addiu $a1, %lo(_end)
subu $a1,$a1,$a0
#include "../../kern/mips/cache_flush.S"
/* Decompress the payload. */
lui $a0, %hi(_edata)
addiu $a0, $a0, %lo(_edata)
lui $t0, %hi(base)
addiu $t0, $t0, %lo(base)
subu $a0, $a0, $t0
addu $a0, $a0, $s0
lw $a1, (GRUB_DECOMPRESSOR_MACHINE_UNCOMPRESSED_ADDR - BASE_ADDR)($s0)
lw $a2, (GRUB_DECOMPRESSOR_MACHINE_COMPRESSED_SIZE - BASE_ADDR)($s0)
lw $a3, (GRUB_DECOMPRESSOR_MACHINE_UNCOMPRESSED_SIZE - BASE_ADDR)($s0)
move $s1, $a1
/* $a0 contains source compressed address, $a1 is destination,
$a2 is compressed size, $a3 is uncompressed size.
*/
move $s6, $a3
lui $t9, %hi(EXT_C(grub_decompress_core))
addiu $t9, $t9, %lo(EXT_C(grub_decompress_core))
#ifdef GRUB_MACHINE_ARC
lui $sp, %hi(_start - 512)
jalr $t9
addiu $sp, $sp, %lo(_start - 512)
#else
lui $sp, %hi(_start - 256)
jalr $t9
addiu $sp, $sp, %lo(_start - 256)
#endif
move $a0, $s1
move $a1, $s6
#include "../../kern/mips/cache_flush.S"
lui $t1, %hi(GRUB_MACHINE_LINK_ADDR)
addiu $t1, %lo(GRUB_MACHINE_LINK_ADDR)
jr $t1
nop
/* Ensure that .data section is created. In code we suppose that _edata
is first location not in decompressor image. Strictly speaking it's
_edata only when .data is present and _etext otherwise. But checking
for .data presence would cost more in code than it is to ensure that
.data is created.
*/
.data
.long 0
|
