Commit e69edc79 authored by Eric Miao's avatar Eric Miao Committed by Uwe Kleine-König
Browse files

ARM: Auto calculate ZRELADDR and provide option for exceptions 



As long as the zImage is placed within the 128MB range from the start of
memory, ZRELADDR (Address where the decompressed kernel will be placed,
usually == PHYS_OFFSET + TEXT_OFFSET) can be determined at run-time by
masking PC with 0xf80000000.

Running through all the Makefile.boot, all those zreladdr-y
addresses == 0x[0-f][08]00_0000 + TEXT_OFFSET can be determined at
run-time.

Option CONFIG_AUTO_ZRELADDR and CONFIG_ZRELADDR are introduced,
CONFIG_ZRELADDR _must_ be explicitly specified if:

- ((zreladdr-y - TEXT_OFFSET) & ~0xf8000000) != 0, which means
  masking PC with 0xf8000000 will result in an incorrect address.
  Currently this is only a problem on u300.

- or the assumption of the zImage being loaded by the bootloader within
  the first 128MB of RAM is incorrect

- or when ZBOOT_ROM is used, where the above assumption is usually wrong.

[ukleinek: changed mask from 0xf0000000 to 0xf8000000 for mx1 and shark
+ some review fixes from the mailing list]

Original-Idea-and-Signed-off-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: default avatarEric Miao <eric.miao@canonical.com>
Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
parent db7b2b4b

arch/arm/Kconfig

+99 −0
Original line number Diff line number Diff line
@@ -1490,6 +1490,105 @@ config ATAGS_PROC 
	  Should the atags used to boot the kernel be exported in an "atags"

	  file in procfs. Useful with kexec.



config AUTO_ZRELADDR

	bool "Auto calculation of the decompressed kernel image address"

	depends on !ZBOOT_ROM && !ARCH_U300

	help

	  ZRELADDR is the physical address where the decompressed kernel

	  image will be placed. If AUTO_ZRELADDR is selected, the address

	  will be determined at run-time by masking the current IP with

	  0xf8000000. This assumes the zImage being placed in the first 128MB

	  from start of memory.



config ZRELADDR

	hex "Physical address of the decompressed kernel image"

	depends on !AUTO_ZRELADDR

	default 0x00008000 if ARCH_BCMRING ||\

		ARCH_CNS3XXX ||\

		ARCH_DOVE ||\

		ARCH_EBSA110 ||\

		ARCH_FOOTBRIDGE ||\

		ARCH_INTEGRATOR ||\

		ARCH_IOP13XX ||\

		ARCH_IOP33X ||\

		ARCH_IXP2000 ||\

		ARCH_IXP23XX ||\

		ARCH_IXP4XX ||\

		ARCH_KIRKWOOD ||\

		ARCH_KS8695 ||\

		ARCH_LOKI ||\

		ARCH_MMP ||\

		ARCH_MV78XX0 ||\

		ARCH_NOMADIK ||\

		ARCH_NUC93X ||\

		ARCH_NS9XXX ||\

		ARCH_ORION5X ||\

		ARCH_SPEAR3XX ||\

		ARCH_SPEAR6XX ||\

		ARCH_U8500 ||\

		ARCH_VERSATILE ||\

		ARCH_W90X900

	default 0x08008000 if ARCH_MX1 ||\

		ARCH_SHARK

	default 0x10008000 if ARCH_MSM ||\

		ARCH_OMAP1 ||\

		ARCH_RPC

	default 0x20008000 if ARCH_S5P6440 ||\

		ARCH_S5P6442 ||\

		ARCH_S5PC100 ||\

		ARCH_S5PV210

	default 0x30008000 if ARCH_S3C2410 ||\

		ARCH_S3C2400 ||\

		ARCH_S3C2412 ||\

		ARCH_S3C2416 ||\

		ARCH_S3C2440 ||\

		ARCH_S3C2443

	default 0x40008000 if ARCH_STMP378X ||\

		ARCH_STMP37XX ||\

		ARCH_SH7372 ||\

		ARCH_SH7377

	default 0x50008000 if ARCH_S3C64XX ||\

		ARCH_SH7367

	default 0x60008000 if ARCH_VEXPRESS

	default 0x80008000 if ARCH_MX25 ||\

		ARCH_MX3 ||\

		ARCH_NETX ||\

		ARCH_OMAP2PLUS ||\

		ARCH_PNX4008

	default 0x90008000 if ARCH_MX5 ||\

		ARCH_MX91231

	default 0xa0008000 if ARCH_IOP32X ||\

		ARCH_PXA ||\

		MACH_MX27

	default 0xc0008000 if ARCH_LH7A40X ||\

		MACH_MX21

	default 0xf0008000 if ARCH_AAEC2000 ||\

		ARCH_L7200

	default 0xc0028000 if ARCH_CLPS711X

	default 0x70008000 if ARCH_AT91 && (ARCH_AT91CAP9 || ARCH_AT91SAM9G45)

	default 0x20008000 if ARCH_AT91 && !(ARCH_AT91CAP9 || ARCH_AT91SAM9G45)

	default 0xc0008000 if ARCH_DAVINCI && ARCH_DAVINCI_DA8XX

	default 0x80008000 if ARCH_DAVINCI && !ARCH_DAVINCI_DA8XX

	default 0x00008000 if ARCH_EP93XX && EP93XX_SDCE3_SYNC_PHYS_OFFSET

	default 0xc0008000 if ARCH_EP93XX && EP93XX_SDCE0_PHYS_OFFSET

	default 0xd0008000 if ARCH_EP93XX && EP93XX_SDCE1_PHYS_OFFSET

	default 0xe0008000 if ARCH_EP93XX && EP93XX_SDCE2_PHYS_OFFSET

	default 0xf0008000 if ARCH_EP93XX && EP93XX_SDCE3_ASYNC_PHYS_OFFSET

	default 0x00008000 if ARCH_GEMINI && GEMINI_MEM_SWAP

	default 0x10008000 if ARCH_GEMINI && !GEMINI_MEM_SWAP

	default 0x70008000 if ARCH_REALVIEW && REALVIEW_HIGH_PHYS_OFFSET

	default 0x00008000 if ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET

	default 0xc0208000 if ARCH_SA1100 && SA1111

	default 0xc0008000 if ARCH_SA1100 && !SA1111

	default 0x30108000 if ARCH_S3C2410 && PM_H1940

	default 0x28E08000 if ARCH_U300 && MACH_U300_SINGLE_RAM

	default 0x48008000 if ARCH_U300 && !MACH_U300_SINGLE_RAM

	help

	  ZRELADDR is the physical address where the decompressed kernel

	  image will be placed. ZRELADDR has to be specified when the

	  assumption of AUTO_ZRELADDR is not valid, or when ZBOOT_ROM is

	  selected.



endmenu



menu "CPU Power Management"

arch/arm/boot/Makefile

+3 −5
Original line number Diff line number Diff line
@@ -14,18 +14,16 @@ 
MKIMAGE         := $(srctree)/scripts/mkuboot.sh



ifneq ($(MACHINE),)

include $(srctree)/$(MACHINE)/Makefile.boot

-include $(srctree)/$(MACHINE)/Makefile.boot

endif



# Note: the following conditions must always be true:

#   ZRELADDR == virt_to_phys(PAGE_OFFSET + TEXT_OFFSET)

#   PARAMS_PHYS must be within 4MB of ZRELADDR

#   INITRD_PHYS must be in RAM

ZRELADDR    := $(zreladdr-y)

PARAMS_PHYS := $(params_phys-y)

INITRD_PHYS := $(initrd_phys-y)



export ZRELADDR INITRD_PHYS PARAMS_PHYS

export INITRD_PHYS PARAMS_PHYS



targets := Image zImage xipImage bootpImage uImage
@@ -67,7 +65,7 @@ quiet_cmd_uimage = UIMAGE $@ 
ifeq ($(CONFIG_ZBOOT_ROM),y)

$(obj)/uImage: LOADADDR=$(CONFIG_ZBOOT_ROM_TEXT)

else

$(obj)/uImage: LOADADDR=$(ZRELADDR)

$(obj)/uImage: LOADADDR=$(CONFIG_ZRELADDR)

endif



ifeq ($(CONFIG_THUMB2_KERNEL),y)

arch/arm/boot/compressed/Makefile

+1 −2
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
# create a compressed vmlinuz image from the original vmlinux

#



AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)

HEAD	= head.o

OBJS	= misc.o decompress.o

FONTC	= $(srctree)/drivers/video/console/font_acorn_8x8.c
@@ -79,8 +80,6 @@ endif 
EXTRA_CFLAGS  := -fpic -fno-builtin

EXTRA_AFLAGS  := -Wa,-march=all



# Supply ZRELADDR to the decompressor via a linker symbol.

LDFLAGS_vmlinux := --defsym zreladdr=$(ZRELADDR)

ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)

LDFLAGS_vmlinux += --be8

endif

arch/arm/boot/compressed/head.S

+9 −3
Original line number Diff line number Diff line
@@ -170,9 +170,16 @@ not_angel: 


		.text

		adr	r0, LC0

 ARM(		ldmia	r0, {r1, r2, r3, r4, r5, r6, r11, ip, sp})

 THUMB(		ldmia	r0, {r1, r2, r3, r4, r5, r6, r11, ip}	)

 ARM(		ldmia	r0, {r1, r2, r3, r5, r6, r11, ip, sp})

 THUMB(		ldmia	r0, {r1, r2, r3, r5, r6, r11, ip}	)

 THUMB(		ldr	sp, [r0, #32]				)

#ifdef CONFIG_AUTO_ZRELADDR

		@ determine final kernel image address

		and	r4, pc, #0xf8000000

		add	r4, r4, #TEXT_OFFSET

#else

		ldr	r4, =CONFIG_ZRELADDR

#endif

		subs	r0, r0, r1		@ calculate the delta offset



						@ if delta is zero, we are
@@ -310,7 +317,6 @@ wont_overwrite: mov r0, r4 
LC0:		.word	LC0			@ r1

		.word	__bss_start		@ r2

		.word	_end			@ r3

		.word	zreladdr		@ r4

		.word	_start			@ r5

		.word	_image_size		@ r6

		.word	_got_start		@ r11

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