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authorEric Miao <eric.miao@canonical.com>2010-07-05 15:56:50 +0200
committerUwe Kleine-König <u.kleine-koenig@pengutronix.de>2010-07-12 10:11:50 +0200
commite69edc7939abda1f696c482faa8168d80420f75c (patch)
tree55209745a63b2c3fd4f85827dc1969fdd2a16b7a /arch
parentdb7b2b4b0e0513627420940d3d62be44a37f0524 (diff)
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: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Eric Miao <eric.miao@canonical.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/Kconfig99
-rw-r--r--arch/arm/boot/Makefile8
-rw-r--r--arch/arm/boot/compressed/Makefile3
-rw-r--r--arch/arm/boot/compressed/head.S12
4 files changed, 112 insertions, 10 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a53ac6570b6..0b0cf0d2872 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -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"
diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile
index 4a590f4113e..f705213caa8 100644
--- a/arch/arm/boot/Makefile
+++ b/arch/arm/boot/Makefile
@@ -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 ($(CONFIG_THUMB2_KERNEL),y)
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 2a80c9de6ea..cc8380b879f 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -4,6 +4,7 @@
# create a compressed vmlinuz image from the original vmlinux
#
+AFLAGS_head.o += -DTEXT_OFFSET=$(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
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index d27faa13179..abf4d65acf6 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -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