diff options
Diffstat (limited to 'grub-core/kern/mips/startup.S')
| -rw-r--r-- | grub-core/kern/mips/startup.S | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/grub-core/kern/mips/startup.S b/grub-core/kern/mips/startup.S new file mode 100644 index 0000000..1fdb58a --- /dev/null +++ b/grub-core/kern/mips/startup.S @@ -0,0 +1,126 @@ +/* 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 + + .globl __start, _start, start + .set noreorder + .set nomacro +__start: +_start: +start: +.extern __bss_start +.extern _end + bal cont + nop + + .org GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE +VARIABLE(grub_total_modules_size) + .long 0 + +VARIABLE (grub_arch_busclock) + .long 0 +VARIABLE (grub_arch_cpuclock) + .long 0 +VARIABLE (grub_arch_memsize) + .long 0 +VARIABLE (grub_arch_highmemsize) + .long 0 +#ifdef GRUB_MACHINE_MIPS_LOONGSON +VARIABLE (grub_arch_machine) + .long GRUB_ARCH_MACHINE_FULOONG2F +#endif +cont: + /* Save our base. */ + move $s0, $ra + +#ifdef GRUB_MACHINE_MIPS_QEMU_MIPS + lui $t1, %hi(grub_arch_busclock) + addiu $t1, %lo(grub_arch_busclock) + sw $s4, 8($t1) +#endif + +#ifdef GRUB_MACHINE_MIPS_LOONGSON + lui $t1, %hi(grub_arch_busclock) + addiu $t1, %lo(grub_arch_busclock) + sw $s2, 0($t1) + sw $s3, 4($t1) + sw $s4, 8($t1) + sw $s5, 12($t1) + sw $s7, 16($t1) +#endif + + /* Move the modules out of BSS. */ + lui $t2, %hi(__bss_start) + addiu $t2, %lo(__bss_start) + + lui $t1, %hi(_end) + addiu $t1, %lo(_end) + addiu $t1, (GRUB_KERNEL_MACHINE_MOD_ALIGN - 1) + li $t3, (GRUB_KERNEL_MACHINE_MOD_ALIGN - 1) + nor $t3, $t3, $0 + and $t1, $t1, $t3 + + lw $t3, (GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE - BASE_ADDR)($s0) + + /* Backward copy. */ + add $t1, $t1, $t3 + add $t2, $t2, $t3 + addiu $t1, $t1, -1 + addiu $t2, $t2, -1 + + /* $t2 is source. $t1 is destination. $t3 is size. */ +modulesmovcont: + beq $t3, $0, modulesmovdone + nop + lb GRUB_ASM_T4, 0($t2) + sb GRUB_ASM_T4, 0($t1) + addiu $t2, $t2, -1 + addiu $t1, $t1, -1 + b modulesmovcont + addiu $t3, $t3, -1 +modulesmovdone: + + /* Clean BSS. */ + + lui $t1, %hi(__bss_start) + addiu $t1, $t1, %lo(__bss_start) + lui $t2, %hi(_end) + addiu $t2, $t2, %lo(_end) +bsscont: + sb $0,0($t1) + addiu $t1, $t1, 1 + sltu $t3, $t1, $t2 + bne $t3, $0, bsscont + nop + + lui $t9, %hi(grub_main) + addiu $t9, %lo(grub_main) + + lui $sp, %hi(GRUB_MACHINE_MEMORY_STACK_HIGH) + jr $t9 + addiu $sp, $sp, %lo(GRUB_MACHINE_MEMORY_STACK_HIGH) + |