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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
*/
#include <common.h>
#include <cbfs.h>
#include <malloc.h>
#include <asm/byteorder.h>
static const u32 good_magic = 0x4f524243;
static const u8 good_file_magic[] = "LARCHIVE";
struct cbfs_priv {
int initialized;
struct cbfs_header header;
struct cbfs_cachenode *file_cache;
enum cbfs_result result;
};
static struct cbfs_priv cbfs_s;
const char *file_cbfs_error(void)
{
switch (cbfs_s.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";
}
}
enum cbfs_result cbfs_get_result(void)
{
return cbfs_s.result;
}
/* 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_fileheader *dest,
const struct cbfs_fileheader *src)
{
memcpy(&dest->magic, &src->magic, sizeof(dest->magic));
dest->len = be32_to_cpu(src->len);
dest->type = be32_to_cpu(src->type);
dest->attributes_offset = be32_to_cpu(src->attributes_offset);
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 new_node 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(struct cbfs_priv *priv, u8 *start, u32 size,
u32 align, struct cbfs_cachenode *new_node,
u32 *used)
{
struct cbfs_fileheader header;
*used = 0;
while (size >= align) {
const struct cbfs_fileheader *file_header =
(const struct cbfs_fileheader *)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_fileheader)) {
priv->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_fileheader);
new_node->name = (char *)file_header +
sizeof(struct cbfs_fileheader);
new_node->name_length = name_len;
new_node->attributes_offset = header.attributes_offset;
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(struct cbfs_priv *priv, u8 *start, u32 size,
u32 align)
{
struct cbfs_cachenode *cache_node;
struct cbfs_cachenode *new_node;
struct cbfs_cachenode **cache_tail = &priv->file_cache;
/* Clear out old information. */
cache_node = priv->file_cache;
while (cache_node) {
struct cbfs_cachenode *old_node = cache_node;
cache_node = cache_node->next;
free(old_node);
}
priv->file_cache = NULL;
while (size >= align) {
int ret;
u32 used;
new_node = (struct cbfs_cachenode *)
malloc(sizeof(struct cbfs_cachenode));
ret = file_cbfs_next_file(priv, start, size, align, new_node,
&used);
if (ret < 0) {
free(new_node);
return;
} else if (ret == 0) {
free(new_node);
break;
}
*cache_tail = new_node;
cache_tail = &new_node->next;
size -= used;
start += used;
}
priv->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;
int32_t offset = *(u32 *)(end_of_rom - 3);
header_in_rom = (struct cbfs_header *)(end_of_rom + offset + 1);
swap_header(header, header_in_rom);
if (header->magic != good_magic || header->offset >
header->rom_size - header->boot_block_size) {
cbfs_s.result = CBFS_BAD_HEADER;
return 1;
}
return 0;
}
static int cbfs_load_header_ptr(struct cbfs_priv *priv, ulong base,
struct cbfs_header *header)
{
struct cbfs_header *header_in_rom;
header_in_rom = (struct cbfs_header *)base;
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 -EFAULT;
}
return 0;
}
static void cbfs_init(struct cbfs_priv *priv, uintptr_t end_of_rom)
{
u8 *start_of_rom;
priv->initialized = 0;
if (file_cbfs_load_header(end_of_rom, &priv->header))
return;
start_of_rom = (u8 *)(end_of_rom + 1 - priv->header.rom_size);
file_cbfs_fill_cache(priv, start_of_rom, priv->header.rom_size,
priv->header.align);
if (priv->result == CBFS_SUCCESS)
priv->initialized = 1;
}
void file_cbfs_init(uintptr_t end_of_rom)
{
cbfs_init(&cbfs_s, end_of_rom);
}
int cbfs_init_mem(ulong base, ulong size, 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. Assume that a master header appears at the start, at offset
* 0x38.
*/
ret = cbfs_load_header_ptr(priv, base + 0x38, &priv->header);
if (ret)
return ret;
file_cbfs_fill_cache(priv, (u8 *)base, priv->header.rom_size,
priv->header.align);
if (priv->result != CBFS_SUCCESS)
return -EINVAL;
priv->initialized = 1;
priv = malloc(sizeof(priv_s));
if (!priv)
return -ENOMEM;
memcpy(priv, &priv_s, sizeof(priv_s));
*privp = priv;
return 0;
}
const struct cbfs_header *file_cbfs_get_header(void)
{
struct cbfs_priv *priv = &cbfs_s;
if (priv->initialized) {
priv->result = CBFS_SUCCESS;
return &priv->header;
} else {
priv->result = CBFS_NOT_INITIALIZED;
return NULL;
}
}
const struct cbfs_cachenode *file_cbfs_get_first(void)
{
struct cbfs_priv *priv = &cbfs_s;
if (!priv->initialized) {
priv->result = CBFS_NOT_INITIALIZED;
return NULL;
} else {
priv->result = CBFS_SUCCESS;
return priv->file_cache;
}
}
void file_cbfs_get_next(const struct cbfs_cachenode **file)
{
struct cbfs_priv *priv = &cbfs_s;
if (!priv->initialized) {
priv->result = CBFS_NOT_INITIALIZED;
*file = NULL;
return;
}
if (*file)
*file = (*file)->next;
priv->result = CBFS_SUCCESS;
}
const struct cbfs_cachenode *cbfs_find_file(struct cbfs_priv *priv,
const char *name)
{
struct cbfs_cachenode *cache_node = priv->file_cache;
if (!priv->initialized) {
priv->result = CBFS_NOT_INITIALIZED;
return NULL;
}
while (cache_node) {
if (!strcmp(name, cache_node->name))
break;
cache_node = cache_node->next;
}
if (!cache_node)
priv->result = CBFS_FILE_NOT_FOUND;
else
priv->result = CBFS_SUCCESS;
return cache_node;
}
const struct cbfs_cachenode *file_cbfs_find(const char *name)
{
return cbfs_find_file(&cbfs_s, name);
}
const struct cbfs_cachenode *file_cbfs_find_uncached(uintptr_t end_of_rom,
const char *name)
{
struct cbfs_priv *priv = &cbfs_s;
u8 *start;
u32 size;
u32 align;
static struct cbfs_cachenode node;
if (file_cbfs_load_header(end_of_rom, &priv->header))
return NULL;
start = (u8 *)(end_of_rom + 1 - priv->header.rom_size);
size = priv->header.rom_size;
align = priv->header.align;
while (size >= align) {
int ret;
u32 used;
ret = file_cbfs_next_file(priv, start, size, align, &node,
&used);
if (ret < 0)
return NULL;
else if (ret == 0)
break;
if (!strcmp(name, node.name))
return &node;
size -= used;
start += used;
}
cbfs_s.result = CBFS_FILE_NOT_FOUND;
return NULL;
}
const char *file_cbfs_name(const struct cbfs_cachenode *file)
{
cbfs_s.result = CBFS_SUCCESS;
return file->name;
}
u32 file_cbfs_size(const struct cbfs_cachenode *file)
{
cbfs_s.result = CBFS_SUCCESS;
return file->data_length;
}
u32 file_cbfs_type(const struct cbfs_cachenode *file)
{
cbfs_s.result = CBFS_SUCCESS;
return file->type;
}
long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
unsigned long maxsize)
{
u32 size;
size = file->data_length;
if (maxsize && size > maxsize)
size = maxsize;
memcpy(buffer, file->data, size);
cbfs_s.result = CBFS_SUCCESS;
return size;
}
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