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

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
......@@ -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"
......
......@@ -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 ($(CONFIG_THUMB2_KERNEL),y)
......
......@@ -4,6 +4,7 @@
# create a compressed vmlinuz image from the original vmlinux
#
AFLAGS_head.o += -DTEXT_OFFSET=$(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
......
......@@ -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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