From 9dc2355e515d2026b40da3beab5b9ebaef854c4c Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sun, 24 May 2020 17:38:18 -0600 Subject: [PATCH] cbfs: Unify the two header loaders These two functions have mostly the same code. Pull this out into a common function. Also make this function zero the private data so that callers don't have to do it. Finally, update cbfs_load_header_ptr() to take the base of the ROM as its parameter, which makes more sense than passing the address of the header within the ROM. Signed-off-by: Simon Glass Reviewed-by: Bin Meng --- fs/cbfs/cbfs.c | 59 +++++++++++++++++++++++++++++++------------------- 1 file changed, 37 insertions(+), 22 deletions(-) diff --git a/fs/cbfs/cbfs.c b/fs/cbfs/cbfs.c index f3fcdab1a7..a42c3a51d5 100644 --- a/fs/cbfs/cbfs.c +++ b/fs/cbfs/cbfs.c @@ -177,47 +177,63 @@ static int file_cbfs_fill_cache(struct cbfs_priv *priv, u8 *start, u32 size, return 0; } -/* Get the CBFS header out of the ROM and do endian conversion. */ -static int file_cbfs_load_header(struct cbfs_priv *priv, ulong end_of_rom) +/** + * load_header() - Load the CBFS header + * + * Get the CBFS header out of the ROM and do endian conversion. + * + * @priv: Private data, which is inited by this function + * @addr: Address of CBFS header in memory-mapped SPI flash + * @return 0 if OK, -ENXIO if the header is bad + */ +static int load_header(struct cbfs_priv *priv, ulong addr) { struct cbfs_header *header = &priv->header; struct cbfs_header *header_in_rom; - int32_t offset = *(u32 *)(end_of_rom - 3); - header_in_rom = (struct cbfs_header *)(end_of_rom + offset + 1); + memset(priv, '\0', sizeof(*priv)); + header_in_rom = (struct cbfs_header *)addr; swap_header(header, header_in_rom); if (header->magic != good_magic || header->offset > header->rom_size - header->boot_block_size) { priv->result = CBFS_BAD_HEADER; - return 1; + return -ENXIO; } + return 0; } -static int cbfs_load_header_ptr(struct cbfs_priv *priv, ulong base) +/** + * file_cbfs_load_header() - Get the CBFS header out of the ROM, given the end + * + * @priv: Private data, which is inited by this function + * @end_of_rom: Address of the last byte of the ROM (typically 0xffffffff) + * @return 0 if OK, -ENXIO if the header is bad + */ +static int file_cbfs_load_header(struct cbfs_priv *priv, ulong end_of_rom) { - struct cbfs_header *header = &priv->header; - struct cbfs_header *header_in_rom; - - header_in_rom = (struct cbfs_header *)base; - swap_header(header, header_in_rom); + int offset = *(u32 *)(end_of_rom - 3); - if (header->magic != good_magic || header->offset > - header->rom_size - header->boot_block_size) { - priv->result = CBFS_BAD_HEADER; - return -EFAULT; - } + return load_header(priv, end_of_rom + offset + 1); +} - return 0; +/** + * cbfs_load_header_ptr() - Get the CBFS header out of the ROM, given the base + * + * @priv: Private data, which is inited by this function + * @base: Address of the first byte of the ROM (e.g. 0xff000000) + * @return 0 if OK, -ENXIO if the header is bad + */ +static int cbfs_load_header_ptr(struct cbfs_priv *priv, ulong base) +{ + return load_header(priv, base + MASTER_HDR_OFFSET); } static void cbfs_init(struct cbfs_priv *priv, ulong end_of_rom) { u8 *start_of_rom; - priv->initialized = false; - if (file_cbfs_load_header(priv, end_of_rom)) return; @@ -241,10 +257,9 @@ int cbfs_init_mem(ulong base, ulong size, struct cbfs_priv **privp) /* * Use a local variable to start with until we know that the CBFS is - * valid. Assume that a master header appears at the start, at offset - * 0x38. + * valid. */ - ret = cbfs_load_header_ptr(priv, base + MASTER_HDR_OFFSET); + ret = cbfs_load_header_ptr(priv, base); if (ret) return ret; -- 2.25.1