[U-Boot] [PATCH v2] Add a CBFS driver and commands to u-boot
Gabe Black
gabeblack at chromium.org
Tue Dec 6 02:25:30 CET 2011
Coreboot uses a very simple "file system" called CBFS to keep track of and
allow access to multiple "files" in a ROM image. 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.
Also, 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. This change adds a
new cbfs_file_find_uncached function which searchs a CBFS instance without
touching the heap.
Support for CBFS is compiled in when the CONFIG_CMD_CBFS option is
specified.
Signed-off-by: Gabe Black <gabeblack at chromium.org>
---
Changes in v2:
Fix checkpatch problems, change around identifiers, and change printf to
puts where possible.
Makefile | 6 +-
README | 1 +
common/Makefile | 1 +
common/cmd_cbfs.c | 212 ++++++++++++++++++++++++++++++++
fs/Makefile | 1 +
fs/cbfs/Makefile | 44 +++++++
fs/cbfs/cbfs.c | 354 +++++++++++++++++++++++++++++++++++++++++++++++++++++
include/cbfs.h | 164 +++++++++++++++++++++++++
8 files changed, 780 insertions(+), 3 deletions(-)
create mode 100644 common/cmd_cbfs.c
create mode 100644 fs/cbfs/Makefile
create mode 100644 fs/cbfs/cbfs.c
create mode 100644 include/cbfs.h
diff --git a/Makefile b/Makefile
index d84b350..e1e2ff1 100644
--- a/Makefile
+++ b/Makefile
@@ -234,9 +234,9 @@ ifeq ($(CONFIG_OF_EMBED),y)
LIBS += dts/libdts.o
endif
LIBS += arch/$(ARCH)/lib/lib$(ARCH).o
-LIBS += fs/cramfs/libcramfs.o fs/fat/libfat.o fs/fdos/libfdos.o fs/jffs2/libjffs2.o \
- fs/reiserfs/libreiserfs.o fs/ext2/libext2fs.o fs/yaffs2/libyaffs2.o \
- fs/ubifs/libubifs.o
+LIBS += fs/cramfs/libcramfs.o fs/fat/libfat.o fs/fdos/libfdos.o \
+ fs/jffs2/libjffs2.o fs/reiserfs/libreiserfs.o fs/ext2/libext2fs.o \
+ fs/yaffs2/libyaffs2.o fs/ubifs/libubifs.o fs/cbfs/libcbfs.o
LIBS += net/libnet.o
LIBS += disk/libdisk.o
LIBS += drivers/bios_emulator/libatibiosemu.o
diff --git a/README b/README
index fda0190..b878c4b 100644
--- a/README
+++ b/README
@@ -721,6 +721,7 @@ The following options need to be configured:
CONFIG_CMD_BSP * Board specific commands
CONFIG_CMD_BOOTD bootd
CONFIG_CMD_CACHE * icache, dcache
+ CONFIG_CMD_CBFS * Support for coreboot's CBFS
CONFIG_CMD_CONSOLE coninfo
CONFIG_CMD_CRC32 * crc32
CONFIG_CMD_DATE * support for RTC, date/time...
diff --git a/common/Makefile b/common/Makefile
index 1b672ad..6cfba67 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -89,6 +89,7 @@ COBJS-$(CONFIG_ENV_IS_IN_EEPROM) += cmd_eeprom.o
COBJS-$(CONFIG_CMD_EEPROM) += cmd_eeprom.o
COBJS-$(CONFIG_CMD_ELF) += cmd_elf.o
COBJS-$(CONFIG_SYS_HUSH_PARSER) += cmd_exit.o
+COBJS-$(CONFIG_CMD_CBFS) += cmd_cbfs.o
COBJS-$(CONFIG_CMD_EXT2) += cmd_ext2.o
COBJS-$(CONFIG_CMD_FAT) += cmd_fat.o
COBJS-$(CONFIG_CMD_FDC)$(CONFIG_CMD_FDOS) += cmd_fdc.o
diff --git a/common/cmd_cbfs.c b/common/cmd_cbfs.c
new file mode 100644
index 0000000..5936588
--- /dev/null
+++ b/common/cmd_cbfs.c
@@ -0,0 +1,212 @@
+/*
+ * 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
+ */
+
+/*
+ * CBFS commands
+ */
+#include <common.h>
+#include <command.h>
+#include <cbfs.h>
+
+int do_cbfs_init(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+ uintptr_t end_of_rom = 0xffffffff;
+ char *ep;
+
+ if (argc > 2) {
+ puts("usage: cbfsls [end of rom]>\n");
+ return 0;
+ }
+ if (argc == 2) {
+ end_of_rom = (int)simple_strtoul(argv[1], &ep, 16);
+ if (*ep) {
+ puts("\n** Invalid end of ROM **\n");
+ return 1;
+ }
+ }
+ file_cbfs_init(end_of_rom);
+ if (file_cbfs_result != CBFS_SUCCESS) {
+ printf("%s.\n", file_cbfs_error());
+ return 1;
+ }
+ return 0;
+}
+
+U_BOOT_CMD(
+ cbfsinit, 2, 0, do_cbfs_init,
+ "initialize the cbfs driver",
+ "[end of rom]\n"
+ " - Initialize the cbfs driver. The optional 'end of rom'\n"
+ " parameter specifies where the end of the ROM is that the\n"
+ " CBFS is in. It defaults to 0xFFFFFFFF\n"
+);
+
+int do_cbfs_fsload(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+ long size;
+ unsigned long offset;
+ unsigned long count;
+ char buf[12];
+ cbfs_file file;
+
+ if (argc < 3) {
+ puts("usage: cbfsload <addr> <filename> [bytes]\n");
+ return 1;
+ }
+
+ /* parse offset and count */
+ offset = simple_strtoul(argv[1], NULL, 16);
+ if (argc == 4)
+ count = simple_strtoul(argv[3], NULL, 16);
+ else
+ count = 0;
+
+ file = file_cbfs_find(argv[2]);
+ if (!file) {
+ if (file_cbfs_result == CBFS_FILE_NOT_FOUND)
+ printf("%s: %s\n", file_cbfs_error(), argv[2]);
+ else
+ printf("%s.\n", file_cbfs_error());
+ return 1;
+ }
+
+ printf("reading %s\n", file_cbfs_name(file));
+
+ size = file_cbfs_read(file, (void *)offset, count);
+
+ printf("\n%ld bytes read\n", size);
+
+ sprintf(buf, "%lX", size);
+ setenv("filesize", buf);
+
+ return 0;
+}
+
+U_BOOT_CMD(
+ cbfsload, 4, 0, do_cbfs_fsload,
+ "load binary file from a cbfs filesystem",
+ "<addr> <filename> [bytes]\n"
+ " - load binary file 'filename' from the cbfs to address 'addr'\n"
+);
+
+int do_cbfs_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+ cbfs_file file = file_cbfs_get_first();
+ int files = 0;
+
+ if (!file) {
+ printf("%s.\n", file_cbfs_error());
+ return 1;
+ }
+
+ puts(" size type name\n");
+ puts("------------------------------------------\n");
+ while (file) {
+ u32 type = file_cbfs_type(file);
+ char *type_name = NULL;
+ const char *filename = file_cbfs_name(file);
+ printf(" %8d", file_cbfs_size(file));
+
+ switch (type) {
+ case CBFS_TYPE_STAGE:
+ type_name = "stage";
+ break;
+ case CBFS_TYPE_PAYLOAD:
+ type_name = "payload";
+ break;
+ case CBFS_TYPE_OPTIONROM:
+ type_name = "option rom";
+ break;
+ case CBFS_TYPE_BOOTSPLASH:
+ type_name = "boot splash";
+ break;
+ case CBFS_TYPE_RAW:
+ type_name = "raw";
+ break;
+ case CBFS_TYPE_VSA:
+ type_name = "vsa";
+ break;
+ case CBFS_TYPE_MBI:
+ type_name = "mbi";
+ break;
+ case CBFS_TYPE_MICROCODE:
+ type_name = "microcode";
+ break;
+ case CBFS_COMPONENT_CMOS_DEFAULT:
+ type_name = "cmos default";
+ break;
+ case CBFS_COMPONENT_CMOS_LAYOUT:
+ type_name = "cmos layout";
+ break;
+ case -1UL:
+ type_name = "null";
+ break;
+ }
+ if (type_name)
+ printf(" %16s", type_name);
+ else
+ printf(" %16d", type);
+
+ if (filename[0])
+ printf(" %s\n", filename);
+ else
+ printf(" %s\n", "(empty)");
+ file_cbfs_get_next(&file);
+ files++;
+ }
+
+ printf("\n%d file(s)\n\n", files);
+ return 0;
+}
+
+U_BOOT_CMD(
+ cbfsls, 1, 1, do_cbfs_ls,
+ "list files",
+ " - list the files in the cbfs\n"
+);
+
+int do_cbfs_fsinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+ const struct cbfs_header *header = file_cbfs_get_header();
+ if (!header) {
+ printf("%s.\n", file_cbfs_error());
+ return 1;
+ }
+
+ puts("\n");
+ printf("CBFS version: %#x\n", header->version);
+ printf("ROM size: %#x\n", header->rom_size);
+ printf("Boot block size: %#x\n", header->boot_block_size);
+ printf("CBFS size: %#x\n",
+ header->rom_size - header->boot_block_size - header->offset);
+ printf("Alignment: %d\n", header->align);
+ printf("Offset: %#x\n", header->offset);
+ puts("\n");
+
+ return 0;
+}
+
+U_BOOT_CMD(
+ cbfsinfo, 1, 1, do_cbfs_fsinfo,
+ "print information about filesystem",
+ " - print information about the cbfs filesystem\n"
+);
diff --git a/fs/Makefile b/fs/Makefile
index 22aad12..ca21464 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -23,6 +23,7 @@
#
subdirs-$(CONFIG_CMD_CRAMFS) := cramfs
+subdirs-$(CONFIG_CMD_CBFS) += cbfs
subdirs-$(CONFIG_CMD_EXT2) += ext2
subdirs-$(CONFIG_CMD_FAT) += fat
subdirs-$(CONFIG_CMD_FDOS) += fdos
diff --git a/fs/cbfs/Makefile b/fs/cbfs/Makefile
new file mode 100644
index 0000000..864fdf9
--- /dev/null
+++ b/fs/cbfs/Makefile
@@ -0,0 +1,44 @@
+#
+# 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
+#
+
+include $(TOPDIR)/config.mk
+
+LIB = $(obj)libcbfs.o
+
+AOBJS =
+COBJS-$(CONFIG_CMD_CBFS) := cbfs.o
+
+SRCS := $(AOBJS:.o=.S) $(COBJS-y:.o=.c)
+OBJS := $(addprefix $(obj),$(AOBJS) $(COBJS-y))
+
+all: $(LIB) $(AOBJS)
+
+$(LIB): $(obj).depend $(OBJS)
+ $(call cmd_link_o_target, $(OBJS))
+
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/fs/cbfs/cbfs.c b/fs/cbfs/cbfs.c
new file mode 100644
index 0000000..1a7eed0
--- /dev/null
+++ b/fs/cbfs/cbfs.c
@@ -0,0 +1,354 @@
+/*
+ * 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
+ */
+
+#include <cbfs.h>
+#include <malloc.h>
+#include <asm/byteorder.h>
+
+enum cbfs_result file_cbfs_result;
+
+const char *file_cbfs_error(void)
+{
+ switch (file_cbfs_result) {
+ case CBFS_SUCCESS:
+ return "Success";
+ case CBFS_NOT_INITIALIZED:
+ return "CBFS not initialized";
+ case CBFS_BAD_HEADER:
+ return "Bad CBFS header";
+ case CBFS_BAD_FILE:
+ return "Bad CBFS file";
+ case CBFS_FILE_NOT_FOUND:
+ return "File not found";
+ default:
+ return "Unknown";
+ }
+}
+
+struct cbfs_file_header {
+ u8 magic[8];
+ u32 len;
+ u32 type;
+ u32 checksum;
+ u32 offset;
+} __packed;
+
+struct cbfs_cache_node {
+ struct cbfs_cache_node *next;
+ u32 type;
+ void *data;
+ u32 data_length;
+ char *name;
+ u32 name_length;
+ u32 checksum;
+} __packed;
+
+
+static const u32 good_magic = 0x4f524243;
+static const u8 good_file_magic[] = "LARCHIVE";
+
+
+static int initialized;
+static struct cbfs_header cbfs_header;
+static struct cbfs_cache_node *file_cache;
+
+/* Do endian conversion on the CBFS header structure. */
+static void swap_header(struct cbfs_header *dest, struct cbfs_header *src)
+{
+ dest->magic = be32_to_cpu(src->magic);
+ dest->version = be32_to_cpu(src->version);
+ dest->rom_size = be32_to_cpu(src->rom_size);
+ dest->boot_block_size = be32_to_cpu(src->boot_block_size);
+ dest->align = be32_to_cpu(src->align);
+ dest->offset = be32_to_cpu(src->offset);
+}
+
+/* Do endian conversion on a CBFS file header. */
+static void swap_file_header(struct cbfs_file_header *dest,
+ struct cbfs_file_header *src)
+{
+ memcpy(&dest->magic, &src->magic, sizeof(dest->magic));
+ dest->len = be32_to_cpu(src->len);
+ dest->type = be32_to_cpu(src->type);
+ dest->checksum = be32_to_cpu(src->checksum);
+ dest->offset = be32_to_cpu(src->offset);
+}
+
+/*
+ * Given a starting position in memory, scan forward, bounded by a size, and
+ * find the next valid CBFS file. No memory is allocated by this function. The
+ * caller is responsible for allocating space for the new file structure.
+ *
+ * @param start The location in memory to start from.
+ * @param size The size of the memory region to search.
+ * @param align The alignment boundaries to check on.
+ * @param newNode A pointer to the file structure to load.
+ * @param used A pointer to the count of of bytes scanned through,
+ * including the file if one is found.
+ *
+ * @return 1 if a file is found, 0 if one isn't.
+ */
+static int file_cbfs_next_file(u8 *start, u32 size, u32 align,
+ struct cbfs_cache_node *new_node, u32 *used)
+{
+ struct cbfs_file_header header;
+
+ *used = 0;
+
+ while (size >= align) {
+ struct cbfs_file_header *file_header =
+ (struct cbfs_file_header *)start;
+ u32 name_len;
+ u32 step;
+
+ /* Check if there's a file here. */
+ if (memcmp(good_file_magic, &(file_header->magic),
+ sizeof(file_header->magic))) {
+ *used += align;
+ size -= align;
+ start += align;
+ continue;
+ }
+
+ swap_file_header(&header, file_header);
+ if (header.offset < sizeof(struct cbfs_file_header) ||
+ header.offset > header.len) {
+ file_cbfs_result = CBFS_BAD_FILE;
+ return -1;
+ }
+ new_node->next = NULL;
+ new_node->type = header.type;
+ new_node->data = start + header.offset;
+ new_node->data_length = header.len;
+ name_len = header.offset - sizeof(struct cbfs_file_header);
+ new_node->name = (char *)file_header +
+ sizeof(struct cbfs_file_header);
+ new_node->name_length = name_len;
+ new_node->checksum = header.checksum;
+
+ step = header.len;
+ if (step % align)
+ step = step + align - step % align;
+
+ *used += step;
+ return 1;
+ }
+ return 0;
+}
+
+/* Look through a CBFS instance and copy file metadata into regular memory. */
+static void file_cbfs_fill_cache(u8 *start, u32 size, u32 align)
+{
+ struct cbfs_cache_node *cache_node;
+ struct cbfs_cache_node *new_node;
+ struct cbfs_cache_node **cache_tail = &file_cache;
+
+ /* Clear out old information. */
+ cache_node = file_cache;
+ while (cache_node) {
+ struct cbfs_cache_node *old_node = cache_node;
+ cache_node = cache_node->next;
+ free(old_node);
+ }
+ file_cache = NULL;
+
+ while (size >= align) {
+ int result;
+ u32 used;
+
+ new_node = (struct cbfs_cache_node *)
+ malloc(sizeof(struct cbfs_cache_node));
+ result = file_cbfs_next_file(start, size, align,
+ new_node, &used);
+
+ if (result < 0) {
+ free(new_node);
+ return;
+ } else if (result == 0) {
+ free(new_node);
+ break;
+ }
+ *cache_tail = new_node;
+ cache_tail = &new_node->next;
+
+ size -= used;
+ start += used;
+ }
+ file_cbfs_result = CBFS_SUCCESS;
+}
+
+/* Get the CBFS header out of the ROM and do endian conversion. */
+static int file_cbfs_load_header(uintptr_t end_of_rom,
+ struct cbfs_header *header)
+{
+ struct cbfs_header *header_in_rom;
+
+ header_in_rom = (struct cbfs_header *)(uintptr_t)
+ *(u32 *)(end_of_rom - 3);
+ swap_header(header, header_in_rom);
+
+ if (header->magic != good_magic || header->offset >
+ header->rom_size - header->boot_block_size) {
+ file_cbfs_result = CBFS_BAD_HEADER;
+ return 1;
+ }
+ return 0;
+}
+
+void file_cbfs_init(uintptr_t end_of_rom)
+{
+ u8 *start_of_rom;
+ initialized = 0;
+
+ if (file_cbfs_load_header(end_of_rom, &cbfs_header))
+ return;
+
+ start_of_rom = (u8 *)(end_of_rom + 1 - cbfs_header.rom_size);
+
+ file_cbfs_fill_cache(start_of_rom + cbfs_header.offset,
+ cbfs_header.rom_size, cbfs_header.align);
+ if (file_cbfs_result == CBFS_SUCCESS)
+ initialized = 1;
+}
+
+const struct cbfs_header *file_cbfs_get_header(void)
+{
+ if (initialized) {
+ file_cbfs_result = CBFS_SUCCESS;
+ return &cbfs_header;
+ } else {
+ file_cbfs_result = CBFS_NOT_INITIALIZED;
+ return NULL;
+ }
+}
+
+cbfs_file file_cbfs_get_first(void)
+{
+ if (!initialized) {
+ file_cbfs_result = CBFS_NOT_INITIALIZED;
+ return NULL;
+ } else {
+ file_cbfs_result = CBFS_SUCCESS;
+ return file_cache;
+ }
+}
+
+void file_cbfs_get_next(cbfs_file *file)
+{
+ if (!initialized) {
+ file_cbfs_result = CBFS_NOT_INITIALIZED;
+ file = NULL;
+ return;
+ }
+
+ if (*file)
+ *file = (*file)->next;
+ file_cbfs_result = CBFS_SUCCESS;
+}
+
+cbfs_file file_cbfs_find(const char *name)
+{
+ struct cbfs_cache_node *cache_node = file_cache;
+
+ if (!initialized) {
+ file_cbfs_result = CBFS_NOT_INITIALIZED;
+ return NULL;
+ }
+
+ while (cache_node) {
+ if (!strcmp(name, cache_node->name))
+ break;
+ cache_node = cache_node->next;
+ }
+ if (!cache_node)
+ file_cbfs_result = CBFS_FILE_NOT_FOUND;
+ else
+ file_cbfs_result = CBFS_SUCCESS;
+ return cache_node;
+}
+
+cbfs_file file_cbfs_find_uncached(uintptr_t end_of_rom, const char *name)
+{
+ u8 *start;
+ u32 size;
+ u32 align;
+ static struct cbfs_cache_node node;
+
+ if (file_cbfs_load_header(end_of_rom, &cbfs_header))
+ return NULL;
+
+ start = (u8 *)(end_of_rom + 1 - cbfs_header.rom_size);
+ size = cbfs_header.rom_size;
+ align = cbfs_header.align;
+
+ while (size >= align) {
+ int result;
+ u32 used;
+
+ result = file_cbfs_next_file(start, size, align, &node, &used);
+
+ if (result < 0)
+ return NULL;
+ else if (result == 0)
+ break;
+
+ if (!strcmp(name, node.name))
+ return &node;
+
+ size -= used;
+ start += used;
+ }
+ file_cbfs_result = CBFS_FILE_NOT_FOUND;
+ return NULL;
+}
+
+const char *file_cbfs_name(cbfs_file file)
+{
+ file_cbfs_result = CBFS_SUCCESS;
+ return file->name;
+}
+
+u32 file_cbfs_size(cbfs_file file)
+{
+ file_cbfs_result = CBFS_SUCCESS;
+ return file->data_length;
+}
+
+u32 file_cbfs_type(cbfs_file file)
+{
+ file_cbfs_result = CBFS_SUCCESS;
+ return file->type;
+}
+
+long file_cbfs_read(cbfs_file file, void *buffer, unsigned long maxsize)
+{
+ u32 size;
+
+ size = file->data_length;
+ if (maxsize && size > maxsize)
+ size = maxsize;
+
+ memcpy(buffer, file->data, size);
+
+ file_cbfs_result = CBFS_SUCCESS;
+ return size;
+}
diff --git a/include/cbfs.h b/include/cbfs.h
new file mode 100644
index 0000000..9e97c2d
--- /dev/null
+++ b/include/cbfs.h
@@ -0,0 +1,164 @@
+/*
+ * 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_file_type {
+ 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_cache_node;
+typedef const struct cbfs_cache_node *cbfs_file;
+
+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.
+ */
+cbfs_file 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(cbfs_file *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.
+ */
+cbfs_file 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.
+ */
+cbfs_file 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(cbfs_file 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(cbfs_file 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(cbfs_file 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(cbfs_file file, void *buffer, unsigned long maxsize);
+
+#endif /* __CBFS_H */
--
1.7.3.1
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