| /* 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) |
| |
