125 lines
2.8 KiB
ArmAsm
125 lines
2.8 KiB
ArmAsm
/* startup.S - Startup code for the MIPS. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/symbol.h>
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#include <grub/offsets.h>
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#include <grub/machine/memory.h>
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#include <grub/machine/kernel.h>
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#include <grub/offsets.h>
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#define BASE_ADDR 8
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.globl __start, _start, start
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.set noreorder
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.set nomacro
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__start:
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_start:
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start:
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.extern __bss_start
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.extern _end
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bal cont
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nop
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.org GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE
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VARIABLE(grub_total_modules_size)
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.long 0
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VARIABLE (grub_arch_busclock)
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.long 0
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VARIABLE (grub_arch_cpuclock)
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.long 0
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VARIABLE (grub_arch_memsize)
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.long 0
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VARIABLE (grub_arch_highmemsize)
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.long 0
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#ifdef GRUB_MACHINE_MIPS_LOONGSON
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VARIABLE (grub_arch_machine)
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.long GRUB_ARCH_MACHINE_FULOONG2F
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#endif
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cont:
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/* Save our base. */
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move $s0, $ra
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#ifdef GRUB_MACHINE_MIPS_QEMU_MIPS
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lui $t1, %hi(grub_arch_busclock)
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addiu $t1, %lo(grub_arch_busclock)
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sw $s4, 8($t1)
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#endif
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#ifdef GRUB_MACHINE_MIPS_LOONGSON
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lui $t1, %hi(grub_arch_busclock)
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addiu $t1, %lo(grub_arch_busclock)
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sw $s2, 0($t1)
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sw $s3, 4($t1)
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sw $s4, 8($t1)
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sw $s5, 12($t1)
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sw $s7, 16($t1)
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#endif
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/* Move the modules out of BSS. */
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lui $t2, %hi(__bss_start)
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addiu $t2, %lo(__bss_start)
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lui $t1, %hi(_end)
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addiu $t1, %lo(_end)
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addiu $t1, (GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
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li $t3, (GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
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nor $t3, $t3, $0
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and $t1, $t1, $t3
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lw $t3, (GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE - BASE_ADDR)($s0)
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/* Backward copy. */
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add $t1, $t1, $t3
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add $t2, $t2, $t3
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addiu $t1, $t1, -1
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addiu $t2, $t2, -1
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/* $t2 is source. $t1 is destination. $t3 is size. */
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modulesmovcont:
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beq $t3, $0, modulesmovdone
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nop
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lb $t4, 0($t2)
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sb $t4, 0($t1)
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addiu $t2, $t2, -1
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addiu $t1, $t1, -1
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b modulesmovcont
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addiu $t3, $t3, -1
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modulesmovdone:
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/* Clean BSS. */
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lui $t1, %hi(__bss_start)
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addiu $t1, $t1, %lo(__bss_start)
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lui $t2, %hi(_end)
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addiu $t2, $t2, %lo(_end)
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bsscont:
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sb $0,0($t1)
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addiu $t1, $t1, 1
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sltu $t3, $t1, $t2
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bne $t3, $0, bsscont
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nop
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lui $t9, %hi(grub_main)
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addiu $t9, %lo(grub_main)
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lui $sp, %hi(GRUB_MACHINE_MEMORY_STACK_HIGH)
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jr $t9
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addiu $sp, $sp, %lo(GRUB_MACHINE_MEMORY_STACK_HIGH)
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