[PATCH 05/12] Add compressed image support
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Fri Aug 3 06:25:15 EDT 2012
This allows for creating a lzo compressed binary unsing the pbl.
Only copy the piggydata if needed.
Add CONFIG_PBL_FORCE_PIGGYDATA_COPY option
In some case we need to copy the PIGGYDATA as the link address
as example we run from SRAM and shutdown the SDRAM/DDR for
reconfiguration but most of the time we just need to copy the
executable code.
based on Sascha Hauer
Add compressed image support
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
arch/arm/cpu/start-pbl.c | 59 +++++++++++++++++++++++++++++++++++++---
arch/arm/pbl/zbarebox.lds.S | 1 +
common/Kconfig | 12 +++++++-
include/asm-generic/sections.h | 2 ++
4 files changed, 69 insertions(+), 5 deletions(-)
diff --git a/arch/arm/cpu/start-pbl.c b/arch/arm/cpu/start-pbl.c
index 28d6f34..17e0829 100644
--- a/arch/arm/cpu/start-pbl.c
+++ b/arch/arm/cpu/start-pbl.c
@@ -33,8 +33,33 @@ void __naked __section(.text_head_entry) pbl_start(void)
barebox_arm_head();
}
-void barebox_pbl(uint32_t offset)
+extern void *input_data;
+extern void *input_data_end;
+
+#define STATIC static
+
+#ifdef CONFIG_IMAGE_COMPRESSION_LZO
+#include "../../../lib/decompress_unlzo.c"
+#endif
+
+static void barebox_uncompress(void *compressed_start, unsigned int len)
{
+ void (*barebox)(void);
+
+ if (IS_ENABLED(CONFIG_THUMB2_BAREBOX))
+ barebox = (void *)(TEXT_BASE + 1);
+ else
+ barebox = (void *)TEXT_BASE;
+
+ decompress((void *)compressed_start,
+ len,
+ NULL, NULL,
+ (void *)TEXT_BASE, NULL, NULL);
+
+ /* flush I-cache before jumping to the uncompressed binary */
+ __asm__ __volatile__("mcr p15, 0, %0, c7, c5, 0" : : "r" (0));
+
+ barebox();
}
/*
@@ -44,6 +69,7 @@ void barebox_pbl(uint32_t offset)
void __naked __section(.text_ll_return) board_init_lowlevel_return(void)
{
uint32_t r, addr, offset;
+ uint32_t pg_start, pg_end, pg_len;
/*
* Get runtime address of this function. Do not
@@ -58,6 +84,30 @@ void __naked __section(.text_ll_return) board_init_lowlevel_return(void)
/* Get offset between linked address and runtime address */
offset = (uint32_t)__ll_return - addr;
+ pg_start = (uint32_t)&input_data - offset;
+ pg_end = (uint32_t)&input_data_end - offset;
+ pg_len = pg_end - pg_start;
+
+ if (IS_ENABLED(CONFIG_PBL_FORCE_PIGGYDATA_COPY))
+ goto copy_piggy_link;
+
+ /*
+ * Check if the piggydata binary will be overwritten
+ * by the uncompressed binary or by the pbl relocation
+ */
+ if (!offset ||
+ !((pg_start >= TEXT_BASE && pg_start < TEXT_BASE + pg_len * 4) ||
+ ((uint32_t)_text >= pg_start && (uint32_t)_text <= pg_end)))
+ goto copy_link;
+
+copy_piggy_link:
+ /*
+ * copy piggydata binary to its link address
+ */
+ memcpy(&input_data, (void *)pg_start, pg_len);
+ pg_start = (uint32_t)&input_data;
+
+copy_link:
/* relocate to link address if necessary */
if (offset)
memcpy((void *)_text, (void *)(_text - offset),
@@ -69,12 +119,13 @@ void __naked __section(.text_ll_return) board_init_lowlevel_return(void)
/* flush I-cache before jumping to the copied binary */
__asm__ __volatile__("mcr p15, 0, %0, c7, c5, 0" : : "r" (0));
- r = (unsigned int)&barebox_pbl;
+ r = (unsigned int)&barebox_uncompress;
/* call barebox_uncompress with its absolute address */
__asm__ __volatile__(
"mov r0, %1\n"
+ "mov r1, %2\n"
"mov pc, %0\n"
:
- : "r"(r), "r"(offset),
- : "r0");
+ : "r"(r), "r"(pg_start), "r"(pg_len)
+ : "r0", "r1");
}
diff --git a/arch/arm/pbl/zbarebox.lds.S b/arch/arm/pbl/zbarebox.lds.S
index d587090..2dca278 100644
--- a/arch/arm/pbl/zbarebox.lds.S
+++ b/arch/arm/pbl/zbarebox.lds.S
@@ -74,4 +74,5 @@ SECTIONS
__piggydata_end = .;
_barebox_image_size = __piggydata_end - HEAD_TEXT_BASE;
+ _barebox_pbl_size = __bss_start - HEAD_TEXT_BASE;
}
diff --git a/common/Kconfig b/common/Kconfig
index 7b5a307..828fc05 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -111,11 +111,20 @@ config PBL_IMAGE
bool "Pre-Bootloader image"
depends on HAVE_PBL_IMAGE
+config PBL_FORCE_PIGGYDATA_COPY
+ bool
+ help
+ In some case we need to copy the PIGGYDATA as the link address
+ as example we run from SRAM and shutdown the SDRAM/DDR for
+ reconfiguration but most of the time we just need to copy the
+ executable code.
+
if PBL_IMAGE
config IMAGE_COMPRESSION
- bool "Compressed image"
+ bool
depends on HAVE_IMAGE_COMPRESSION
+ default y
if IMAGE_COMPRESSION
@@ -511,6 +520,7 @@ config DEFAULT_ENVIRONMENT
config DEFAULT_ENVIRONMENT_COMPRESSED
bool
depends on DEFAULT_ENVIRONMENT
+ depends on !IMAGE_COMPRESSION_LZO
default y if ZLIB
default y if BZLIB
default y if LZO_DECOMPRESS
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index 5484b6f..17d5fd1 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -7,8 +7,10 @@ extern char __bare_init_start[], __bare_init_end[];
extern char _end[];
extern void *_barebox_image_size;
extern void *_barebox_bare_init_size;
+extern void *_barebox_pbl_size;
#define barebox_image_size (unsigned int)&_barebox_image_size
#define barebox_bare_init_size (unsigned int)&_barebox_bare_init_size
+#define barebox_pbl_size (unsigned int)&_barebox_pbl_size
#endif /* _ASM_GENERIC_SECTIONS_H_ */
--
1.7.10.4
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