ramips: add code for relocating a kernel to the right place
(used if the boot loader wants a different loadaddr/entry) Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 44014
This commit is contained in:
Felix Fietkau
parent
82f21058a1
commit
33848f14d3
5 changed files with 365 additions and 0 deletions
72
target/linux/ramips/image/relocate/Makefile
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72
target/linux/ramips/image/relocate/Makefile
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#
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# Makefile for the LZMA compressed kernel loader for
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# Atheros AR7XXX/AR9XXX based boards
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#
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# Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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#
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# Some parts of this file was based on the OpenWrt specific lzma-loader
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# for the BCM47xx and ADM5120 based boards:
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# Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
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# Copyright (C) 2005 Mineharu Takahara <mtakahar@yahoo.com>
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# Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License version 2 as published
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# by the Free Software Foundation.
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#
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LOADADDR :=
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LZMA_TEXT_START := 0x81000000
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LOADER_DATA :=
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BOARD :=
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FLASH_OFFS :=
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FLASH_MAX :=
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PLATFORM :=
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CC := $(CROSS_COMPILE)gcc
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LD := $(CROSS_COMPILE)ld
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OBJCOPY := $(CROSS_COMPILE)objcopy
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OBJDUMP := $(CROSS_COMPILE)objdump
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BIN_FLAGS := -O binary -R .reginfo -R .note -R .comment -R .mdebug -S
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CFLAGS = -D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -Os \
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-fno-strict-aliasing -fno-common -fomit-frame-pointer -G 0 \
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-mno-abicalls -fno-pic -ffunction-sections -pipe -mlong-calls \
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-fno-common -ffreestanding -fhonour-copts \
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-mabi=32 -march=mips32r2 \
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-Wa,-32 -Wa,-march=mips32r2 -Wa,-mips32r2 -Wa,--trap \
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-DCONFIG_CACHELINE_SIZE=32 -DKERNEL_ADDR=$(KERNEL_ADDR)
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ASFLAGS = $(CFLAGS) -D__ASSEMBLY__
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LDFLAGS = -static --gc-sections -no-warn-mismatch
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LDFLAGS += -e startup -T loader.lds -Ttext $(LZMA_TEXT_START)
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O_FORMAT = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
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OBJECTS := head.o
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all: head.o loader.bin
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# Don't build dependencies, this may die if $(CC) isn't gcc
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dep:
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install:
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%.o : %.c
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$(CC) $(CFLAGS) -c -o $@ $<
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%.o : %.S
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$(CC) $(ASFLAGS) -c -o $@ $<
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loader: $(OBJECTS)
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$(LD) $(LDFLAGS) -o $@ $(OBJECTS)
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loader.bin: loader
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$(OBJCOPY) $(BIN_FLAGS) $< $@
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mrproper: clean
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clean:
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rm -f loader *.elf *.bin *.o
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85
target/linux/ramips/image/relocate/cacheops.h
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85
target/linux/ramips/image/relocate/cacheops.h
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@ -0,0 +1,85 @@
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/*
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* Cache operations for the cache instruction.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* (C) Copyright 1996, 97, 99, 2002, 03 Ralf Baechle
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* (C) Copyright 1999 Silicon Graphics, Inc.
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*/
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#ifndef __ASM_CACHEOPS_H
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#define __ASM_CACHEOPS_H
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/*
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* Cache Operations available on all MIPS processors with R4000-style caches
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*/
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#define Index_Invalidate_I 0x00
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#define Index_Writeback_Inv_D 0x01
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#define Index_Load_Tag_I 0x04
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#define Index_Load_Tag_D 0x05
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#define Index_Store_Tag_I 0x08
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#define Index_Store_Tag_D 0x09
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#if defined(CONFIG_CPU_LOONGSON2)
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#define Hit_Invalidate_I 0x00
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#else
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#define Hit_Invalidate_I 0x10
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#endif
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#define Hit_Invalidate_D 0x11
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#define Hit_Writeback_Inv_D 0x15
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/*
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* R4000-specific cacheops
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*/
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#define Create_Dirty_Excl_D 0x0d
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#define Fill 0x14
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#define Hit_Writeback_I 0x18
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#define Hit_Writeback_D 0x19
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/*
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* R4000SC and R4400SC-specific cacheops
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*/
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#define Index_Invalidate_SI 0x02
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#define Index_Writeback_Inv_SD 0x03
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#define Index_Load_Tag_SI 0x06
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#define Index_Load_Tag_SD 0x07
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#define Index_Store_Tag_SI 0x0A
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#define Index_Store_Tag_SD 0x0B
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#define Create_Dirty_Excl_SD 0x0f
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#define Hit_Invalidate_SI 0x12
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#define Hit_Invalidate_SD 0x13
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#define Hit_Writeback_Inv_SD 0x17
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#define Hit_Writeback_SD 0x1b
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#define Hit_Set_Virtual_SI 0x1e
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#define Hit_Set_Virtual_SD 0x1f
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/*
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* R5000-specific cacheops
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*/
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#define R5K_Page_Invalidate_S 0x17
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/*
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* RM7000-specific cacheops
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*/
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#define Page_Invalidate_T 0x16
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/*
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* R10000-specific cacheops
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*
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* Cacheops 0x02, 0x06, 0x0a, 0x0c-0x0e, 0x16, 0x1a and 0x1e are unused.
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* Most of the _S cacheops are identical to the R4000SC _SD cacheops.
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*/
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#define Index_Writeback_Inv_S 0x03
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#define Index_Load_Tag_S 0x07
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#define Index_Store_Tag_S 0x0B
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#define Hit_Invalidate_S 0x13
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#define Cache_Barrier 0x14
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#define Hit_Writeback_Inv_S 0x17
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#define Index_Load_Data_I 0x18
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#define Index_Load_Data_D 0x19
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#define Index_Load_Data_S 0x1b
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#define Index_Store_Data_I 0x1c
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#define Index_Store_Data_D 0x1d
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#define Index_Store_Data_S 0x1f
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#endif /* __ASM_CACHEOPS_H */
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39
target/linux/ramips/image/relocate/cp0regdef.h
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39
target/linux/ramips/image/relocate/cp0regdef.h
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@ -0,0 +1,39 @@
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/*
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* Copyright (C) 1994, 1995, 1996, 1997, 2000, 2001 by Ralf Baechle
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*
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* Copyright (C) 2001, Monta Vista Software
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* Author: jsun@mvista.com or jsun@junsun.net
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*/
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#ifndef _cp0regdef_h_
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#define _cp0regdef_h_
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#define CP0_INDEX $0
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#define CP0_RANDOM $1
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#define CP0_ENTRYLO0 $2
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#define CP0_ENTRYLO1 $3
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#define CP0_CONTEXT $4
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#define CP0_PAGEMASK $5
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#define CP0_WIRED $6
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#define CP0_BADVADDR $8
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#define CP0_COUNT $9
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#define CP0_ENTRYHI $10
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#define CP0_COMPARE $11
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#define CP0_STATUS $12
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#define CP0_CAUSE $13
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#define CP0_EPC $14
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#define CP0_PRID $15
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#define CP0_CONFIG $16
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#define CP0_LLADDR $17
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#define CP0_WATCHLO $18
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#define CP0_WATCHHI $19
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#define CP0_XCONTEXT $20
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#define CP0_FRAMEMASK $21
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#define CP0_DIAGNOSTIC $22
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#define CP0_PERFORMANCE $25
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#define CP0_ECC $26
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#define CP0_CACHEERR $27
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#define CP0_TAGLO $28
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#define CP0_TAGHI $29
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#define CP0_ERROREPC $30
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#endif
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153
target/linux/ramips/image/relocate/head.S
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153
target/linux/ramips/image/relocate/head.S
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/*
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* LZMA compressed kernel loader for Atheros AR7XXX/AR9XXX based boards
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*
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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*
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* Some parts of this code was based on the OpenWrt specific lzma-loader
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* for the BCM47xx and ADM5120 based boards:
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* Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
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* Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <asm/asm.h>
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#include <asm/regdef.h>
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#include "cp0regdef.h"
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#include "cacheops.h"
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#define KSEG0 0x80000000
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.macro ehb
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sll zero, 3
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.endm
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.macro reset
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li t0, 0xbe000034
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lw t1, 0(t0)
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ori t1, 1
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sw t1, 0(t0)
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.endm
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.text
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LEAF(startup)
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.set noreorder
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.set mips32
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.fill 0x10000
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mtc0 zero, CP0_WATCHLO # clear watch registers
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mtc0 zero, CP0_WATCHHI
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mtc0 zero, CP0_CAUSE # clear before writing status register
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mfc0 t0, CP0_STATUS
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li t1, 0x1000001f
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or t0, t1
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xori t0, 0x1f
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mtc0 t0, CP0_STATUS
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ehb
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mtc0 zero, CP0_COUNT
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mtc0 zero, CP0_COMPARE
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ehb
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la t0, __reloc_label # get linked address of label
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bal __reloc_label # branch and link to label to
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nop # get actual address
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__reloc_label:
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subu t0, ra, t0 # get reloc_delta
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/* Copy our code to the right place */
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la t1, _code_start # get linked address of _code_start
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la t2, _code_end # get linked address of _code_end
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addu t4, t2, t0 # calculate actual address of _code_end
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lw t5, 0(t4) # get extra data size
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add t2, t5
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add t2, 4
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add t0, t1 # calculate actual address of _code_start
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__reloc_copy:
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lw t3, 0(t0)
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sw t3, 0(t1)
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add t1, 4
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blt t1, t2, __reloc_copy
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add t0, 4
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/* flush cache */
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la t0, _code_start
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la t1, _code_end
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li t2, ~(CONFIG_CACHELINE_SIZE - 1)
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and t0, t2
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and t1, t2
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li t2, CONFIG_CACHELINE_SIZE
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b __flush_check
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nop
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__flush_line:
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cache Hit_Writeback_Inv_D, 0(t0)
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cache Hit_Invalidate_I, 0(t0)
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add t0, t2
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__flush_check:
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bne t0, t1, __flush_line
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nop
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sync
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la t0, __reloc_back
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j t0
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nop
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__reloc_back:
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la t0, _code_end
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add t0, 4
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addu t1, t0, t5
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li t2, KERNEL_ADDR
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__kernel_copy:
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lw t3, 0(t0)
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sw t3, 0(t2)
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add t0, 4
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blt t0, t1, __kernel_copy
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add t2, 4
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/* flush cache */
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li t0, KERNEL_ADDR
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addu t1, t0, t5
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add t1, CONFIG_CACHELINE_SIZE - 1
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li t2, ~(CONFIG_CACHELINE_SIZE - 1)
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and t0, t2
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and t1, t2
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li t2, CONFIG_CACHELINE_SIZE
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b __kernel_flush_check
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nop
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__kernel_flush_line:
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cache Hit_Writeback_Inv_D, 0(t0)
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cache Hit_Invalidate_I, 0(t0)
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add t0, t2
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__kernel_flush_check:
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bne t0, t1, __kernel_flush_line
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nop
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sync
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li t0, KERNEL_ADDR
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jr t0
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nop
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.set reorder
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END(startup)
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16
target/linux/ramips/image/relocate/loader.lds
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16
target/linux/ramips/image/relocate/loader.lds
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@ -0,0 +1,16 @@
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OUTPUT_ARCH(mips)
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SECTIONS {
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.text : {
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_code_start = .;
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*(.text)
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*(.text.*)
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*(.rodata)
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*(.rodata.*)
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*(.data)
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*(.data.*)
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}
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. = ALIGN(32);
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_code_end = .;
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}
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