137 lines
3.1 KiB
ArmAsm
137 lines
3.1 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/cpu/kernel.h>
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#include <grub/machine/memory.h>
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#define BASE_ADDR 8
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.extern __bss_start
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.extern _end
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.globl __start, _start, start
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__start:
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_start:
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start:
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bal codestart
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. = _start + GRUB_KERNEL_CPU_COMPRESSED_SIZE
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compressed_size:
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.long 0
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. = _start + GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE
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total_module_size:
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.long 0
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. = _start + GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE
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kernel_image_size:
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.long 0
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codestart:
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/* Decompress the payload. */
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move $s0, $ra
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addiu $a0, $s0, GRUB_KERNEL_CPU_RAW_SIZE - BASE_ADDR
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lui $a1, %hi(compressed)
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addiu $a1, %lo(compressed)
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lw $a2, (GRUB_KERNEL_CPU_COMPRESSED_SIZE - BASE_ADDR)($s0)
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move $s1, $a1
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/* $a0 contains source compressed address, $a1 is destination,
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$a2 is compressed size. FIXME: put LZMA here. Don't clober $s0, $s1.
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On return $v0 contains uncompressed size.
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*/
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move $v0, $a2
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reloccont:
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lb $t4, 0($a0)
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sb $t4, 0($a1)
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addiu $a1,$a1,1
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addiu $a0,$a0,1
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addiu $a2, 0xffff
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bne $a2, $0, reloccont
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move $a0, $s1
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move $a1, $v0
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#include "cache_flush.S"
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lui $t1, %hi(cont)
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addiu $t1, %lo(cont)
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jr $t1
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. = _start + GRUB_KERNEL_CPU_RAW_SIZE
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compressed:
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. = _start + GRUB_KERNEL_CPU_PREFIX
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VARIABLE(grub_prefix)
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/* to be filled by grub-mkelfimage */
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/*
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* Leave some breathing room for the prefix.
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*/
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. = _start + GRUB_KERNEL_CPU_DATA_END
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cont:
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/* Move the modules out of BSS. */
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lui $t1, %hi(_start)
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addiu $t1, %lo(_start)
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lw $t2, (GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE - BASE_ADDR)($s0)
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addu $t2, $t1, $t2
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lui $t1, %hi(_end)
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addiu $t1, %lo(_end)
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addiu $t1, (GRUB_MOD_ALIGN-1)
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li $t3, (GRUB_MOD_ALIGN-1)
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nor $t3, $t3, $0
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and $t1, $t1, $t3
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lw $t3, (GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE - BASE_ADDR)($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, 0xffff
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addiu $t2, $t2, 0xffff
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/* $t2 is source. $t1 is destination. $t3 is size. */
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modulesmovcont:
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lb $t4, 0($t2)
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sb $t4, 0($t1)
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addiu $t1,$t1,0xffff
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addiu $t2,$t2,0xffff
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addiu $t3, 0xffff
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bne $t3, $0, modulesmovcont
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/* Clean BSS. */
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lui $t1, %hi(__bss_start)
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addiu $t1, %lo(__bss_start)
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lui $t2, %hi(_end)
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addiu $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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li $sp, GRUB_MACHINE_MEMORY_STACK_HIGH
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lui $t1, %hi(grub_main)
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addiu $t1, %lo(grub_main)
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jr $t1
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