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libfdt: Add fdt_header_size() 

We have a couple of places within libfdt and its tests where we need to
find the size of the header, based on the version.  Add a helper function
for it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
main
David Gibson 2018-03-16 22:40:26 +11:00
parent 6473a21d8b
commit 0112fda03b
3 changed files with 29 additions and 10 deletions
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20
libfdt/fdt.c
View File

@ -96,21 +96,33 @@ static int check_block_(uint32_t hdrsize, uint32_t totalsize,
return 1;
}

size_t fdt_header_size_(uint32_t version)
{
if (version <= 1)
return FDT_V1_SIZE;
else if (version <= 2)
return FDT_V2_SIZE;
else if (version <= 3)
return FDT_V3_SIZE;
else if (version <= 16)
return FDT_V16_SIZE;
else
return FDT_V17_SIZE;
}

int fdt_check_header(const void *fdt)
{
size_t hdrsize = FDT_V16_SIZE;
size_t hdrsize;

if (fdt_magic(fdt) != FDT_MAGIC)
return -FDT_ERR_BADMAGIC;
hdrsize = fdt_header_size(fdt);
if ((fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
|| (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION))
return -FDT_ERR_BADVERSION;
if (fdt_version(fdt) < fdt_last_comp_version(fdt))
return -FDT_ERR_BADVERSION;

if (fdt_version(fdt) >= 17)
hdrsize = FDT_V17_SIZE;

if ((fdt_totalsize(fdt) < hdrsize)
|| (fdt_totalsize(fdt) > INT_MAX))
return -FDT_ERR_TRUNCATED;

11
libfdt/libfdt.h
View File

@ -244,8 +244,19 @@ fdt_set_hdr_(size_dt_strings);
fdt_set_hdr_(size_dt_struct);
#undef fdt_set_hdr_

/**
* fdt_header_size - return the size of the tree's header
* @fdt: pointer to a flattened device tree
*/
size_t fdt_header_size_(uint32_t version);
static inline size_t fdt_header_size(const void *fdt)
{
return fdt_header_size_(fdt_version(fdt));
}

/**
* fdt_check_header - sanity check a device tree header

* @fdt: pointer to data which might be a flattened device tree
*
* fdt_check_header() checks that the given buffer contains what

8
tests/mangle-layout.c
View File

@ -44,13 +44,9 @@ static void expand_buf(struct bufstate *buf, int newsize)

static void new_header(struct bufstate *buf, int version, const void *fdt)
{
int hdrsize;
int hdrsize = fdt_header_size_(version);

if (version == 16)
hdrsize = FDT_V16_SIZE;
else if (version == 17)
hdrsize = FDT_V17_SIZE;
else
if ((version != 16) && (version != 17))
CONFIG("Bad version %d", version);

expand_buf(buf, hdrsize);