#define OS_SEEK_END 2
/**
+ * os_filesize() - Calculate the size of a file
+ *
+ * @fd: File descriptor as returned by os_open()
+ * Return: file size or negative error code
+ */
+int os_filesize(int fd);
+
+/**
* Access to the OS open() system call
*
* @pathname: Pathname of file to open
* This follows the semantics of realloc(), so can perform an os_malloc() or
* os_free() depending on @ptr and @length.
*
- * Return: Pointer to reallocated memory or NULL if @length is 0
+ * @ptr: pointer to previously allocated memory of NULL
+ * @length: number of bytes to allocate
+ * Return: pointer to reallocated memory or NULL if @length is 0
*/
void *os_realloc(void *ptr, size_t length);
* @fname: place to put full path to U-Boot
* @maxlen: maximum size of @fname
* @use_img: select the 'u-boot.img' file instead of the 'u-boot' ELF file
+ * @cur_prefix: prefix of current executable, e.g. "spl" or "tpl"
+ * @next_prefix: prefix of executable to find, e.g. "spl" or ""
* Return: 0 if OK, -NOSPC if the filename is too large, -ENOENT if not found
*/
-int os_find_u_boot(char *fname, int maxlen, bool use_img);
+int os_find_u_boot(char *fname, int maxlen, bool use_img,
+ const char *cur_prefix, const char *next_prefix);
/**
* os_spl_to_uboot() - Run U-Boot proper
*/
int os_read_file(const char *name, void **bufp, int *sizep);
+/**
+ * os_map_file() - Map a file from the host filesystem into memory
+ *
+ * This can be useful when to provide a backing store for an emulated device
+ *
+ * @pathname: File pathname to map
+ * @os_flags: Flags, like OS_O_RDONLY, OS_O_RDWR
+ * @bufp: Returns buffer containing the file
+ * @sizep: Returns size of data
+ * Return: 0 if OK, -ve on error
+ */
+int os_map_file(const char *pathname, int os_flags, void **bufp, int *sizep);
+
/*
* os_find_text_base() - Find the text section in this running process
*