grub/grub-core/kern/mips/startup.S

/* 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)
kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00			`/* 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>`
Fill info tables for qemu, sparc and mips 2010-04-26 12:42:40 +00:00			`#include <grub/offsets.h>`
kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00			`#include <grub/machine/memory.h>`
fuloong support 2011-01-18 14:28:44 +00:00			`#include <grub/machine/kernel.h>`
Some cleanups 2010-04-26 19:11:16 +00:00			`#include <grub/offsets.h>`
mips: Make the assembly-code N32-compatible. There are no $t4 or $t5 in N32 but there are $a4 and $a5. 2015-10-10 08:34:55 +00:00			`#include <grub/mips/asm.h>`
kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00
asm part for mips decompressor 2010-09-21 08:14:08 +00:00			`#define BASE_ADDR 8`

kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00			`.globl __start, _start, start`
asm part for mips decompressor 2010-09-21 08:14:08 +00:00			`.set noreorder`
			`.set nomacro`
kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00			`__start:`
			`_start:`
asm part for mips decompressor 2010-09-21 08:14:08 +00:00			`start:`
			`.extern __bss_start`
			`.extern _end`
			`bal cont`
			`nop`
Startup code cleanup 2009-12-06 14:32:32 +00:00
mips: Switch to more portable .org Binary is unchanged. 2015-02-21 19:43:57 +00:00			`.org GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE`
Reduce memory footprint on SGI by putting modules before the kernel as opposed to after. * grub-core/Makefile.core.def (kernel): Increase linking address. (none_decompress): Likewise. (xz_decompress): Likewise. * grub-core/boot/mips/startup_raw.S: Use prewritten uncompression address. * grub-core/kern/mips/arc/init.c (grub_machine_init): Handle memory layout change. (grub_arch_modules_addr): New function. * grub-core/kern/mips/init.c (grub_arch_modules_addr): Moved from here... * grub-core/kern/mips/loongson/init.c (grub_arch_modules_addr): .. here * grub-core/kern/mips/qemu_mips/init.c (grub_arch_modules_addr): ... and here. * grub-core/kern/mips/startup.S (total_size): Rename to ... (grub_total_modules_size): ... this. Make global. [GRUB_MACHINE_ARC]: Don't attempt to move modules out of the bss. * include/grub/offsets.h (GRUB_KERNEL_MIPS_LOONGSON_UNCOMPRESSED_ADDR): New definition. (GRUB_KERNEL_MIPS_QEMU_MIPS_UNCOMPRESSED_ADDR): Likewise. (GRUB_KERNEL_MIPS_ARC_UNCOMPRESSED_ADDR): Likewise. (GRUB_KERNEL_MACHINE_UNCOMPRESSED_ADDR): Likewise. (GRUB_KERNEL_MIPS_ARC_LINK_ADDR): Increased. * util/grub-mkimage.c (image_target_desc): New flag PLATFORM_FLAGS_MODULES_BEFORE_KERNEL. (image_targets): Set PLATFORM_FLAGS_MODULES_BEFORE_KERNEL on mips-arc. (generate_image): Handle images with modules before kernel. 2011-05-17 19:15:54 +00:00			`VARIABLE(grub_total_modules_size)`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`.long 0`

retrieve firmware arguments 2009-12-07 01:09:39 +00:00			`VARIABLE (grub_arch_busclock)`
			`.long 0`
* grub-core/kern/mips/startup.S (grub_arch_cpuclock): Move to the right place. 2011-05-17 16:39:32 +00:00			`VARIABLE (grub_arch_cpuclock)`
			`.long 0`
retrieve firmware arguments 2009-12-07 01:09:39 +00:00			`VARIABLE (grub_arch_memsize)`
			`.long 0`
			`VARIABLE (grub_arch_highmemsize)`
			`.long 0`
Prevent potential loss of memory map by overwrite on qemu-mips. * grub-core/boot/mips/startup_raw.S [GRUB_MACHINE_MIPS_QEMU_MIPS]: Save ram size in $s4. * grub-core/kern/mips/qemu_mips/init.c (RAMSIZE): Removed. All users changed to grub_arch_memsize. * grub-core/kern/mips/startup.S (grub_arch_machine): Restrict to Loongson. [GRUB_MACHINE_MIPS_QEMU_MIPS]: Save grub_arch_memsize. * grub-core/loader/mips/linux.c (grub_linux_boot): Pass memory size. * include/grub/mips/qemu_mips/memory.h (grub_arch_memsize): New external variable. 2011-05-17 17:32:51 +00:00			`#ifdef GRUB_MACHINE_MIPS_LOONGSON`
fuloong support 2011-01-18 14:28:44 +00:00			`VARIABLE (grub_arch_machine)`
Rename Fuloong into Fuloong 2F. Add new ID for Fuloong2E. * grub-core/Makefile.core.def (fwstart_fuloong): Rename fwstart_fuloong into fwstart_fuloong2f. Use boot/mips/loongson/fuloong2f.S. * grub-core/boot/mips/loongson/fuloong.S: Rename to ... * grub-core/boot/mips/loongson/fuloong2f.S: ... this. (FULOONG): Rename to ... (FULOONG2F): ... this. All users updated. * grub-core/boot/mips/startup_raw.S (machtype_fuloong_str): Rename to (machtype_fuloong2f_str): ... this. (machtype_fuloong2e_str): New string. Check for machtype_fuloong2e_str. * grub-core/loader/mips/linux.c (loongson_machtypes) [GRUB_MACHINE_MIPS_LOONGSON]: Add GRUB_ARCH_MACHINE_FULOONG2E. * grub-core/term/serial.c (loongson_defserial) [GRUB_MACHINE_MIPS_LOONGSON]: New array. (grub_serial_register) [GRUB_MACHINE_MIPS_LOONGSON]: Use loongson_defserial. * include/grub/mips/loongson/kernel.h (GRUB_ARCH_MACHINE_FULOONG): Rename to ... (GRUB_ARCH_MACHINE_FULOONG2F): ... this. (GRUB_ARCH_MACHINE_FULOONG2E): New const. * util/grub-mkimage.c (image_target_desc): Rename IMAGE_FULOONG_FLASH to IMAGE_FULOONG2F_FLASH. All users updated. (image_targets): Rename images. * util/grub-mkstandalone.in: Accept fuloong2f and fuloong2e. 2011-08-19 20:46:11 +00:00			`.long GRUB_ARCH_MACHINE_FULOONG2F`
Prevent potential loss of memory map by overwrite on qemu-mips. * grub-core/boot/mips/startup_raw.S [GRUB_MACHINE_MIPS_QEMU_MIPS]: Save ram size in $s4. * grub-core/kern/mips/qemu_mips/init.c (RAMSIZE): Removed. All users changed to grub_arch_memsize. * grub-core/kern/mips/startup.S (grub_arch_machine): Restrict to Loongson. [GRUB_MACHINE_MIPS_QEMU_MIPS]: Save grub_arch_memsize. * grub-core/loader/mips/linux.c (grub_linux_boot): Pass memory size. * include/grub/mips/qemu_mips/memory.h (grub_arch_memsize): New external variable. 2011-05-17 17:32:51 +00:00			`#endif`
Startup code cleanup 2009-12-06 14:32:32 +00:00			`cont:`
asm part for mips decompressor 2010-09-21 08:14:08 +00:00			`/* Save our base. */`
			`move $s0, $ra`
kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00
Prevent potential loss of memory map by overwrite on qemu-mips. * grub-core/boot/mips/startup_raw.S [GRUB_MACHINE_MIPS_QEMU_MIPS]: Save ram size in $s4. * grub-core/kern/mips/qemu_mips/init.c (RAMSIZE): Removed. All users changed to grub_arch_memsize. * grub-core/kern/mips/startup.S (grub_arch_machine): Restrict to Loongson. [GRUB_MACHINE_MIPS_QEMU_MIPS]: Save grub_arch_memsize. * grub-core/loader/mips/linux.c (grub_linux_boot): Pass memory size. * include/grub/mips/qemu_mips/memory.h (grub_arch_memsize): New external variable. 2011-05-17 17:32:51 +00:00			`#ifdef GRUB_MACHINE_MIPS_QEMU_MIPS`
			`lui $t1, %hi(grub_arch_busclock)`
			`addiu $t1, %lo(grub_arch_busclock)`
			`sw $s4, 8($t1)`
			`#endif`

Rename mipsel-yeeloong to mipsel-loongson 2011-02-19 12:18:05 +00:00			`#ifdef GRUB_MACHINE_MIPS_LOONGSON`
retrieve firmware arguments 2009-12-07 01:09:39 +00:00			`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)`
machtype autodetection 2011-01-18 18:04:27 +00:00			`sw $s7, 16($t1)`
retrieve firmware arguments 2009-12-07 01:09:39 +00:00			`#endif`

new image format for mips. Asm part 2009-10-18 12:10:31 +00:00			`/* Move the modules out of BSS. */`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`lui $t2, %hi(__bss_start)`
			`addiu $t2, %lo(__bss_start)`
new image format for mips. Asm part 2009-10-18 12:10:31 +00:00
			`lui $t1, %hi(_end)`
			`addiu $t1, %lo(_end)`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`addiu $t1, (GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)`
			`li $t3, (GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)`
new image format for mips. Asm part 2009-10-18 12:10:31 +00:00			`nor $t3, $t3, $0`
			`and $t1, $t1, $t3`

Fill info tables for qemu, sparc and mips 2010-04-26 12:42:40 +00:00			`lw $t3, (GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE - BASE_ADDR)($s0)`
kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00
copy modules backwards 2009-10-18 14:10:42 +00:00			`/* Backward copy. */`
			`add $t1, $t1, $t3`
			`add $t2, $t2, $t3`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`addiu $t1, $t1, -1`
			`addiu $t2, $t2, -1`
copy modules backwards 2009-10-18 14:10:42 +00:00
new image format for mips. Asm part 2009-10-18 12:10:31 +00:00			`/* $t2 is source. $t1 is destination. $t3 is size. */`
			`modulesmovcont:`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`beq $t3, $0, modulesmovdone`
			`nop`
mips: Make the assembly-code N32-compatible. There are no $t4 or $t5 in N32 but there are $a4 and $a5. 2015-10-10 08:34:55 +00:00			`lb GRUB_ASM_T4, 0($t2)`
			`sb GRUB_ASM_T4, 0($t1)`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`addiu $t2, $t2, -1`
asm part for mips decompressor 2010-09-21 08:14:08 +00:00			`addiu $t1, $t1, -1`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`b modulesmovcont`
			`addiu $t3, $t3, -1`
			`modulesmovdone:`

new image format for mips. Asm part 2009-10-18 12:10:31 +00:00			`/* Clean BSS. */`

kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00			`lui $t1, %hi(__bss_start)`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`addiu $t1, $t1, %lo(__bss_start)`
kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00			`lui $t2, %hi(_end)`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`addiu $t2, $t2, %lo(_end)`
kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00			`bsscont:`
			`sb $0,0($t1)`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`addiu $t1, $t1, 1`
asm part for mips decompressor 2010-09-21 08:14:08 +00:00			`sltu $t3, $t1, $t2`
new image format for mips. Asm part 2009-10-18 12:10:31 +00:00			`bne $t3, $0, bsscont`
Fix bugs in asm code 2010-09-21 22:53:34 +00:00			`nop`
kernel.img compiles on mipsel-qemu-r4k 2009-10-09 17:50:31 +00:00
Use $t9 for indirect calls from asm to C as PIC ABI requires. 2013-11-22 03:45:05 +00:00			`lui $t9, %hi(grub_main)`
			`addiu $t9, %lo(grub_main)`
new image format for mips. Asm part 2009-10-18 12:10:31 +00:00
MAke a separate scratch for decompressor 2010-09-21 17:39:51 +00:00			`lui $sp, %hi(GRUB_MACHINE_MEMORY_STACK_HIGH)`
Use $t9 for indirect calls from asm to C as PIC ABI requires. 2013-11-22 03:45:05 +00:00			`jr $t9`
MAke a separate scratch for decompressor 2010-09-21 17:39:51 +00:00			`addiu $sp, $sp, %lo(GRUB_MACHINE_MEMORY_STACK_HIGH)`
new image format for mips. Asm part 2009-10-18 12:10:31 +00:00