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authorDaisuke Nojiri <dnojiri@chromium.org>2015-07-09 15:07:45 -0700
committerPatrick Georgi <pgeorgi@google.com>2015-09-17 18:52:56 +0000
commitd66f1da846f8e524a6211518c46a993d563b4ffc (patch)
tree9b3de5f0c8aa4e3baf6afdf3f29770876bdd10f8 /payloads/libpayload
parent5c6dc72501329226b9ead5a184fb49f5af732dd3 (diff)
downloadcoreboot-d66f1da846f8e524a6211518c46a993d563b4ffc.tar.xz
libpayload: allow compression at file header level
Decompression is handled transparently within cbfs_get_file_content: const char *name = "foo.bmp"; void *dst = cbfs_get_file_content(media, name, type, NULL); To keep things consistent, a couple of API changes were necessary: - cbfs_get_file_content always returns a copy of the data, even for uncompressed files. It's the callers responsibility to free the memory. - same for cbfs_load_payload and cbfs_find_file. - cbfs_load_optionrom doesn't take a "dest" argument anymore but always returns a copy of the data, for compressed and uncompressed files. Like with cbfs_get_file_content, the caller is responsible to free it. It also decompresses based on extended file attributes instead of the cbfs_optionrom subheader that libpayload specified but that (AFAIK) nobody ever used, given that there's not even tooling for that. Change-Id: If959e3dff9b93c6ae45ec7358afcc7840bc17218 Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/10938 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
Diffstat (limited to 'payloads/libpayload')
-rw-r--r--payloads/libpayload/include/cbfs.h2
-rw-r--r--payloads/libpayload/include/cbfs_core.h18
-rw-r--r--payloads/libpayload/libcbfs/cbfs.c37
-rw-r--r--payloads/libpayload/libcbfs/cbfs_core.c33
4 files changed, 56 insertions, 34 deletions
diff --git a/payloads/libpayload/include/cbfs.h b/payloads/libpayload/include/cbfs.h
index 59c31dbb93..f57dce0bdd 100644
--- a/payloads/libpayload/include/cbfs.h
+++ b/payloads/libpayload/include/cbfs.h
@@ -59,7 +59,7 @@ void *cbfs_find_file(const char *name, int type);
int cbfs_execute_stage(struct cbfs_media *media, const char *name);
void *cbfs_load_optionrom(struct cbfs_media *media, uint16_t vendor,
- uint16_t device, void * dest);
+ uint16_t device);
void *cbfs_load_payload(struct cbfs_media *media, const char *name);
void *cbfs_load_stage(struct cbfs_media *media, const char *name);
diff --git a/payloads/libpayload/include/cbfs_core.h b/payloads/libpayload/include/cbfs_core.h
index a2ee74459b..3878e55f23 100644
--- a/payloads/libpayload/include/cbfs_core.h
+++ b/payloads/libpayload/include/cbfs_core.h
@@ -53,6 +53,7 @@
#include <endian.h>
#include <stddef.h>
#include <stdint.h>
+#include <stdlib.h>
/** These are standard values for the known compression
alogrithms that coreboot knows about for stages and
@@ -141,6 +142,7 @@ struct cbfs_file {
* 0xff. Support both. */
#define CBFS_FILE_ATTR_TAG_UNUSED 0
#define CBFS_FILE_ATTR_TAG_UNUSED2 0xffffffff
+#define CBFS_FILE_ATTR_TAG_COMPRESSION 0x42435a4c
/* The common fields of extended cbfs file attributes.
Attributes are expected to start with tag/len, then append their
@@ -152,6 +154,14 @@ struct cbfs_file_attribute {
uint8_t data[0];
} __attribute__((packed));
+struct cbfs_file_attr_compression {
+ uint32_t tag;
+ uint32_t len;
+ /* whole file compression format. 0 if no compression. */
+ uint32_t compression;
+ uint32_t decompressed_size;
+} __attribute__((packed));
+
/* Given a cbfs_file, return the first file attribute, or NULL. */
struct cbfs_file_attribute *cbfs_file_first_attr(struct cbfs_file *file);
@@ -237,10 +247,14 @@ struct cbfs_media {
int (*close)(struct cbfs_media *media);
};
-/* returns pointer to a file entry inside CBFS or NULL */
+/* returns pointer to a file entry inside CBFS or NULL on error */
struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name);
-/* returns pointer to file content inside CBFS after if type is correct */
+/*
+ * Returns pointer to a copy of the file content or NULL on error.
+ * If the file is compressed, data will be decompressed.
+ * The caller owns the returned memory.
+ */
void *cbfs_get_file_content(struct cbfs_media *media, const char *name,
int type, size_t *sz);
diff --git a/payloads/libpayload/libcbfs/cbfs.c b/payloads/libpayload/libcbfs/cbfs.c
index 3e614b66c5..49e4941181 100644
--- a/payloads/libpayload/libcbfs/cbfs.c
+++ b/payloads/libpayload/libcbfs/cbfs.c
@@ -79,41 +79,14 @@ static void tohex16(unsigned int val, char* dest)
}
void *cbfs_load_optionrom(struct cbfs_media *media, uint16_t vendor,
- uint16_t device, void *dest)
+ uint16_t device)
{
char name[17] = "pciXXXX,XXXX.rom";
- struct cbfs_optionrom *orom;
- uint8_t *src;
tohex16(vendor, name+3);
tohex16(device, name+8);
- orom = (struct cbfs_optionrom *)
- cbfs_get_file_content(media, name, CBFS_TYPE_OPTIONROM, NULL);
-
- if (orom == NULL)
- return NULL;
-
- /* They might have specified a dest address. If so, we can decompress.
- * If not, there's not much hope of decompressing or relocating the rom.
- * in the common case, the expansion rom is uncompressed, we
- * pass 0 in for the dest, and all we have to do is find the rom and
- * return a pointer to it.
- */
-
- /* BUG: the cbfstool is (not yet) including a cbfs_optionrom header */
- src = (uint8_t*)orom; // + sizeof(struct cbfs_optionrom);
-
- if (! dest)
- return src;
-
- if (!cbfs_decompress(ntohl(orom->compression),
- src,
- dest,
- ntohl(orom->len)))
- return NULL;
-
- return dest;
+ return cbfs_get_file_content(media, name, CBFS_TYPE_OPTIONROM, NULL);
}
void * cbfs_load_stage(struct cbfs_media *media, const char *name)
@@ -149,6 +122,7 @@ void * cbfs_load_stage(struct cbfs_media *media, const char *name)
entry = stage->entry;
// entry = ntohll(stage->entry);
+ free(stage);
return (void *) entry;
}
@@ -163,11 +137,14 @@ int cbfs_execute_stage(struct cbfs_media *media, const char *name)
if (ntohl(stage->compression) != CBFS_COMPRESS_NONE) {
LOG("Unable to run %s: Compressed file"
"Not supported for in-place execution\n", name);
+ free(stage);
return 1;
}
LOG("run @ %p\n", (void *) (uintptr_t)ntohll(stage->entry));
- return run_address((void *)(uintptr_t)ntohll(stage->entry));
+ int result = run_address((void *)(uintptr_t)ntohll(stage->entry));
+ free(stage);
+ return result;
}
void *cbfs_load_payload(struct cbfs_media *media, const char *name)
diff --git a/payloads/libpayload/libcbfs/cbfs_core.c b/payloads/libpayload/libcbfs/cbfs_core.c
index 5541f0242d..5a46af8daa 100644
--- a/payloads/libpayload/libcbfs/cbfs_core.c
+++ b/payloads/libpayload/libcbfs/cbfs_core.c
@@ -210,7 +210,38 @@ void *cbfs_get_file_content(struct cbfs_media *media, const char *name,
if (sz)
*sz = ntohl(file->len);
- return (void *)CBFS_SUBHEADER(file);
+ void *file_content = (void *)CBFS_SUBHEADER(file);
+
+ struct cbfs_file_attribute *attr = cbfs_file_first_attr(file);
+ while (attr) {
+ if (ntohl(attr->tag) == CBFS_FILE_ATTR_TAG_COMPRESSION)
+ break;
+ attr = cbfs_file_next_attr(file, attr);
+ }
+
+ int compression_algo = CBFS_COMPRESS_NONE;
+ if (attr) {
+ struct cbfs_file_attr_compression *comp =
+ (struct cbfs_file_attr_compression *)attr;
+ compression_algo = ntohl(comp->compression);
+ DEBUG("File '%s' is compressed (alg=%d)\n", compression_algo);
+ *sz = ntohl(comp->decompressed_size);
+ }
+
+ void *dst = malloc(*sz);
+ if (dst == NULL)
+ goto err;
+
+ if (!cbfs_decompress(compression_algo, file_content, dst, *sz))
+ goto err;
+
+ media->unmap(media, file);
+ return dst;
+
+err:
+ media->unmap(media, file);
+ free(dst);
+ return NULL;
}
struct cbfs_file_attribute *cbfs_file_first_attr(struct cbfs_file *file)