diff options
author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-08-03 17:03:01 +0800 |
---|---|---|
committer | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-08-03 18:09:15 +0800 |
commit | 5c3db111daa298b0fdab421e1fbd87427e9a108c (patch) | |
tree | 251925b6bf3e2c8a66e1ccfa887d26d4d2e7675a /arch | |
parent | 53391b5a8dda0b8d33b5433db21e43c82cb5246d (diff) | |
download | barebox-5c3db111daa298b0fdab421e1fbd87427e9a108c.tar.gz barebox-5c3db111daa298b0fdab421e1fbd87427e9a108c.tar.xz |
Add compressed image support
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@pengutronix.de>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/cpu/start-pbl.c | 59 | ||||
-rw-r--r-- | arch/arm/pbl/zbarebox.lds.S | 1 |
2 files changed, 56 insertions, 4 deletions
diff --git a/arch/arm/cpu/start-pbl.c b/arch/arm/cpu/start-pbl.c index 28d6f34449..17e0829da3 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 d58709030e..2dca278318 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; } |