fs: Add a Coreboot Filesystem (CBFS) driver and commands

This change adds CBFS support and some commands to use it to u-boot. These
commands are:

cbfsinit - Initialize CBFS support and pull all metadata into RAM. The end of
the ROM is an optional parameter which defaults to the standard 0xffffffff and
can be used to support multiple CBFSes in a system. The last one set up with
cbfsinit is the one that will be used.

cbfsinfo - Print information from the CBFS header.

cbfsls - Print out the size, type, and name of all the files in the current
CBFS. Recognized types are translated into symbolic names.

cbfsload - Load a file from CBFS into memory. Like the similar command for fat
filesystems, you can optionally provide a maximum size.

Support for CBFS is compiled in when the CONFIG_CMD_CBFS option is specified.

The CBFS driver can also be used programmatically from within u-boot.

If u-boot needs something out of CBFS very early before the heap is
configured, it won't be able to use the normal CBFS support which caches some
information in memory it allocates from the heap. The
cbfs_file_find_uncached function searches a CBFS instance without touching
the heap.

Signed-off-by: Gabe Black <gabeblack@google.com>
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 181 insertions, 0 deletions

diff --git a/include/cbfs.h b/include/cbfs.h
new file mode 100644
index 0000000..6ea3f35
--- /dev/null
+++ b/include/cbfs.h
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __CBFS_H
+#define __CBFS_H
+
+#include <compiler.h>
+#include <linux/compiler.h>
+
+enum cbfs_result {
+	CBFS_SUCCESS = 0,
+	CBFS_NOT_INITIALIZED,
+	CBFS_BAD_HEADER,
+	CBFS_BAD_FILE,
+	CBFS_FILE_NOT_FOUND
+};
+
+enum cbfs_filetype {
+	CBFS_TYPE_STAGE = 0x10,
+	CBFS_TYPE_PAYLOAD = 0x20,
+	CBFS_TYPE_OPTIONROM = 0x30,
+	CBFS_TYPE_BOOTSPLASH = 0x40,
+	CBFS_TYPE_RAW = 0x50,
+	CBFS_TYPE_VSA = 0x51,
+	CBFS_TYPE_MBI = 0x52,
+	CBFS_TYPE_MICROCODE = 0x53,
+	CBFS_COMPONENT_CMOS_DEFAULT = 0xaa,
+	CBFS_COMPONENT_CMOS_LAYOUT = 0x01aa
+};
+
+struct cbfs_header {
+	u32 magic;
+	u32 version;
+	u32 rom_size;
+	u32 boot_block_size;
+	u32 align;
+	u32 offset;
+	u32 pad[2];
+} __packed;
+
+struct cbfs_fileheader {
+	u8 magic[8];
+	u32 len;
+	u32 type;
+	u32 checksum;
+	u32 offset;
+} __packed;
+
+struct cbfs_cachenode {
+	struct cbfs_cachenode *next;
+	u32 type;
+	void *data;
+	u32 data_length;
+	char *name;
+	u32 name_length;
+	u32 checksum;
+} __packed;
+
+extern enum cbfs_result file_cbfs_result;
+
+/*
+ * Return a string describing the most recent error condition.
+ *
+ * @return A pointer to the constant string.
+ */
+const char *file_cbfs_error(void);
+
+/*
+ * Initialize the CBFS driver and load metadata into RAM.
+ *
+ * @param end_of_rom	Points to the end of the ROM the CBFS should be read
+ *                      from.
+ */
+void file_cbfs_init(uintptr_t end_of_rom);
+
+/*
+ * Get the header structure for the current CBFS.
+ *
+ * @return A pointer to the constant structure, or NULL if there is none.
+ */
+const struct cbfs_header *file_cbfs_get_header(void);
+
+/*
+ * Get a handle for the first file in CBFS.
+ *
+ * @return A handle for the first file in CBFS, NULL on error.
+ */
+const struct cbfs_cachenode *file_cbfs_get_first(void);
+
+/*
+ * Get a handle to the file after this one in CBFS.
+ *
+ * @param file		A pointer to the handle to advance.
+ */
+void file_cbfs_get_next(const struct cbfs_cachenode **file);
+
+/*
+ * Find a file with a particular name in CBFS.
+ *
+ * @param name		The name to search for.
+ *
+ * @return A handle to the file, or NULL on error.
+ */
+const struct cbfs_cachenode *file_cbfs_find(const char *name);
+
+
+/***************************************************************************/
+/* All of the functions below can be used without first initializing CBFS. */
+/***************************************************************************/
+
+/*
+ * Find a file with a particular name in CBFS without using the heap.
+ *
+ * @param end_of_rom	Points to the end of the ROM the CBFS should be read
+ *                      from.
+ * @param name		The name to search for.
+ *
+ * @return A handle to the file, or NULL on error.
+ */
+const struct cbfs_cachenode *file_cbfs_find_uncached(uintptr_t end_of_rom,
+						     const char *name);
+
+/*
+ * Get the name of a file in CBFS.
+ *
+ * @param file		The handle to the file.
+ *
+ * @return The name of the file, NULL on error.
+ */
+const char *file_cbfs_name(const struct cbfs_cachenode *file);
+
+/*
+ * Get the size of a file in CBFS.
+ *
+ * @param file		The handle to the file.
+ *
+ * @return The size of the file, zero on error.
+ */
+u32 file_cbfs_size(const struct cbfs_cachenode *file);
+
+/*
+ * Get the type of a file in CBFS.
+ *
+ * @param file		The handle to the file.
+ *
+ * @return The type of the file, zero on error.
+ */
+u32 file_cbfs_type(const struct cbfs_cachenode *file);
+
+/*
+ * Read a file from CBFS into RAM
+ *
+ * @param file		A handle to the file to read.
+ * @param buffer	Where to read it into memory.
+ *
+ * @return If positive or zero, the number of characters read. If negative, an
+ *         error occurred.
+ */
+long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
+		    unsigned long maxsize);
+
+#endif /* __CBFS_H */