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cbfs: Allow access to CBFS without a header

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In some cases CBFS does not start with a header but is just a collection
of files. It is possible to support this so long as the size of the CBFS
is provided.

Update the cbfs_init_mem() function to support this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-03-15 18:00:12 +13:00
parent 272e62cb83
commit 5536f1285f
3 changed files with 21 additions and 8 deletions
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3
arch/x86/lib/fsp2/fsp_init.c
View file

@ -84,7 +84,8 @@ static int get_cbfs_fsp(enum fsp_type_t type, ulong map_base,
struct cbfs_priv *cbfs;
int ret;
ret = cbfs_init_mem(map_base + cbfs_base, &cbfs);
ret = cbfs_init_mem(map_base + cbfs_base, CBFS_SIZE_UNKNOWN, true,
&cbfs);
if (ret)
return ret;
if (!ret) {

18
fs/cbfs/cbfs.c
View file

@ -276,18 +276,26 @@ int file_cbfs_init(ulong end_of_rom)
return cbfs_init(&cbfs_s, end_of_rom);
}
int cbfs_init_mem(ulong base, struct cbfs_priv **privp)
int cbfs_init_mem(ulong base, ulong size, bool require_hdr,
struct cbfs_priv **privp)
{
struct cbfs_priv priv_s, *priv = &priv_s;
int ret;
/*
* Use a local variable to start with until we know that the CBFS is
* valid.
* Use a local variable to start with until we know that the * CBFS is
* valid. Note that size is detected from the header, if present,
* meaning the parameter is ignored.
*/
ret = cbfs_load_header_ptr(priv, base);
if (ret)
return ret;
if (ret) {
if (require_hdr || size == CBFS_SIZE_UNKNOWN)
return ret;
memset(priv, '\0', sizeof(struct cbfs_priv));
priv->header.rom_size = size;
priv->header.align = CBFS_ALIGN_SIZE;
priv->start = (void *)base;
}
ret = file_cbfs_fill_cache(priv, priv->header.rom_size,
priv->header.align);

8
include/cbfs.h
View file

@ -42,6 +42,8 @@ enum cbfs_filetype {
enum {
CBFS_HEADER_MAGIC = 0x4f524243,
CBFS_SIZE_UNKNOWN = 0xffffffff,
CBFS_ALIGN_SIZE = 0x40,
};
/**
@ -186,11 +188,13 @@ const struct cbfs_cachenode *cbfs_find_file(struct cbfs_priv *cbfs,
* cbfs_init_mem() - Set up a new CBFS
*
* @base: Base address of CBFS
* @size: Size of CBFS if known, else CBFS_SIZE_UNKNOWN
* @require_header: true to read a header at the start, false to not require one
* @cbfsp: Returns a pointer to CBFS on success
* @return 0 if OK, -ve on error
*/
int cbfs_init_mem(ulong base, struct cbfs_priv **privp);
int cbfs_init_mem(ulong base, ulong size, bool require_hdr,
struct cbfs_priv **privp);
/***************************************************************************/
/* All of the functions below can be used without first initializing CBFS. */