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| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2011-04-19 15:42:43 -0400 |
|---|---|---|
| committer | Nicolas Pitre <nico@fluxnic.net> | 2011-05-07 00:07:59 -0400 |
| commit | 34cc1a8fe0d3f89f3602b49f1121a99d2bfc5efc (patch) | |
| tree | d8c70249ddd62093a3074996fd8b25b46a4ad211 | |
| parent | ea9df3b168e641e87dbf889afae16390119e4179 (diff) | |
| download | blackbird-op-linux-34cc1a8fe0d3f89f3602b49f1121a99d2bfc5efc.tar.gz blackbird-op-linux-34cc1a8fe0d3f89f3602b49f1121a99d2bfc5efc.zip | |
ARM: zImage: no need to get the decompressed size from the filesystem
In commit d239b1dc093d the hardcoded 4x estimate for the decompressed
kernel size was replaced by the exact Image file size and passed to
the linker as a symbol value. Turns out that this is unneeded as the
size is already included at the end of the compressed piggy data.
For those compressed formats that don't include this data, the build
system already takes care of appending it using size_append in
scripts/Makefile.lib. So let's use that instead.
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Tony Lindgren <tony@atomide.com>
| -rw-r--r-- | arch/arm/boot/compressed/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/boot/compressed/head.S | 18 |
2 files changed, 16 insertions, 4 deletions
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 0c6852d93506..79b5c62746df 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -98,8 +98,6 @@ endif ccflags-y := -fpic -fno-builtin asflags-y := -Wa,-march=all -# Provide size of uncompressed kernel to the decompressor via a linker symbol. -LDFLAGS_vmlinux = --defsym _image_size=$(shell stat -c "%s" $(obj)/../Image) # Supply ZRELADDR to the decompressor via a linker symbol. ifneq ($(CONFIG_AUTO_ZRELADDR),y) LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR) diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index d1fd1cfca9c2..b541217bd040 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -187,7 +187,7 @@ not_angel: bl cache_on restart: adr r0, LC0 - ldmia r0, {r1, r2, r3, r6, r9, r11, r12} + ldmia r0, {r1, r2, r3, r6, r10, r11, r12} ldr sp, [r0, #28] /* @@ -196,6 +196,20 @@ restart: adr r0, LC0 */ sub r0, r0, r1 @ calculate the delta offset add r6, r6, r0 @ _edata + add r10, r10, r0 @ inflated kernel size location + + /* + * The kernel build system appends the size of the + * decompressed kernel at the end of the compressed data + * in little-endian form. + */ + ldrb r9, [r10, #0] + ldrb lr, [r10, #1] + orr r9, r9, lr, lsl #8 + ldrb lr, [r10, #2] + ldrb r10, [r10, #3] + orr r9, r9, lr, lsl #16 + orr r9, r9, r10, lsl #24 #ifndef CONFIG_ZBOOT_ROM /* malloc space is above the relocated stack (64k max) */ @@ -355,7 +369,7 @@ LC0: .word LC0 @ r1 .word __bss_start @ r2 .word _end @ r3 .word _edata @ r6 - .word _image_size @ r9 + .word input_data_end - 4 @ r10 (inflated size location) .word _got_start @ r11 .word _got_end @ ip .word user_stack_end @ sp |
