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spl: spl_legacy: Add lzma decompression support for legacy image

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This patch adds support for decompressing LZMA compressed u-boot payload
in legacy uImage format.

Using this patch together with u-boot-lzma.img may be useful for some
platforms as they can reduce the size and load time of u-boot payload.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
This commit is contained in:
Weijie Gao 2020-04-21 09:28:45 +02:00 committed by Daniel Schwierzeck
parent f1b0f1550b
commit aba6e77a30
1 changed files with 60 additions and 2 deletions
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62
common/spl/spl_legacy.c
View file

@ -4,8 +4,15 @@
*/
#include <common.h>
#include <malloc.h>
#include <spl.h>
#include <lzma/LzmaTypes.h>
#include <lzma/LzmaDec.h>
#include <lzma/LzmaTools.h>
#define LZMA_LEN (1 << 20)
int spl_parse_legacy_header(struct spl_image_info *spl_image,
const struct image_header *header)
{
@ -52,10 +59,27 @@ int spl_parse_legacy_header(struct spl_image_info *spl_image,
return 0;
}
/*
* This function is added explicitly to avoid code size increase, when
* no compression method is enabled. The compiler will optimize the
* following switch/case statement in spl_load_legacy_img() away due to
* Dead Code Elimination.
*/
static inline int spl_image_get_comp(const struct image_header *hdr)
{
if (IS_ENABLED(CONFIG_SPL_LZMA))
return image_get_comp(hdr);
return IH_COMP_NONE;
}
int spl_load_legacy_img(struct spl_image_info *spl_image,
struct spl_load_info *load, ulong header)
{
__maybe_unused SizeT lzma_len;
__maybe_unused void *src;
struct image_header hdr;
ulong dataptr;
int ret;
/* Read header into local struct */
@ -65,9 +89,43 @@ int spl_load_legacy_img(struct spl_image_info *spl_image,
if (ret)
return ret;
dataptr = header + sizeof(hdr);
/* Read image */
load->read(load, header + sizeof(hdr), spl_image->size,
(void *)(unsigned long)spl_image->load_addr);
switch (spl_image_get_comp(&hdr)) {
case IH_COMP_NONE:
load->read(load, dataptr, spl_image->size,
(void *)(unsigned long)spl_image->load_addr);
break;
case IH_COMP_LZMA:
lzma_len = LZMA_LEN;
debug("LZMA: Decompressing %08lx to %08lx\n",
dataptr, spl_image->load_addr);
src = malloc(spl_image->size);
if (!src) {
printf("Unable to allocate %d bytes for LZMA\n",
spl_image->size);
return -ENOMEM;
}
load->read(load, dataptr, spl_image->size, src);
ret = lzmaBuffToBuffDecompress((void *)spl_image->load_addr,
&lzma_len, src, spl_image->size);
if (ret) {
printf("LZMA decompression error: %d\n", ret);
return ret;
}
spl_image->size = lzma_len;
break;
default:
debug("Compression method %s is not supported\n",
genimg_get_comp_short_name(image_get_comp(&hdr)));
return -EINVAL;
}
return 0;
}