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/*
* This file is part of the coreboot project.
*
* Copyright 2015 Google Inc.
*
* 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; version 2 of the License.
*
* 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.
*/
#include <console/console.h>
#include <commonlib/cbfs.h>
#include <commonlib/endian.h>
#include <commonlib/helpers.h>
#include <string.h>
#if !defined(ERROR)
#define ERROR(x...) printk(BIOS_ERR, "CBFS: " x)
#endif
#if !defined(LOG)
#define LOG(x...) printk(BIOS_INFO, "CBFS: " x)
#endif
#if defined(IS_ENABLED)
#if IS_ENABLED(CONFIG_DEBUG_CBFS)
#define DEBUG(x...) printk(BIOS_SPEW, "CBFS: " x)
#else
#define DEBUG(x...)
#endif
#elif !defined(DEBUG)
#define DEBUG(x...)
#endif
static size_t cbfs_next_offset(const struct region_device *cbfs,
const struct cbfsf *f)
{
size_t offset;
if (f == NULL)
return 0;
/* The region_device objects store absolute offets over the whole
* region. Therefore a relative offset needs to be calculated. */
offset = rdev_relative_offset(cbfs, &f->data);
offset += region_device_sz(&f->data);
return ALIGN_UP(offset, CBFS_ALIGNMENT);
}
static int cbfs_end(const struct region_device *cbfs, size_t offset)
{
if (offset >= region_device_sz(cbfs))
return 1;
return 0;
}
int cbfs_for_each_file(const struct region_device *cbfs,
const struct cbfsf *prev, struct cbfsf *fh)
{
size_t offset;
offset = cbfs_next_offset(cbfs, prev);
/* Try to scan the entire cbfs region looking for file name. */
while (1) {
struct cbfs_file file;
const size_t fsz = sizeof(file);
DEBUG("Checking offset %zx\n", offset);
/* End of region. */
if (cbfs_end(cbfs, offset))
return 1;
/* Can't read file. Nothing else to do but bail out. */
if (rdev_readat(cbfs, &file, offset, fsz) != fsz)
break;
if (memcmp(file.magic, CBFS_FILE_MAGIC, sizeof(file.magic))) {
offset++;
offset = ALIGN_UP(offset, CBFS_ALIGNMENT);
continue;
}
file.len = read_be32(&file.len);
file.offset = read_be32(&file.offset);
DEBUG("File @ offset %zx size %x\n", offset, file.len);
/* Keep track of both the metadata and the data for the file. */
if (rdev_chain(&fh->metadata, cbfs, offset, file.offset))
break;
if (rdev_chain(&fh->data, cbfs, offset + file.offset, file.len))
break;
/* Success. */
return 0;
}
return -1;
}
int cbfs_locate(struct cbfsf *fh, const struct region_device *cbfs,
const char *name, uint32_t *type)
{
struct cbfsf *prev;
LOG("Locating '%s'\n", name);
prev = NULL;
while (1) {
int ret;
char *fname;
int name_match;
const size_t fsz = sizeof(struct cbfs_file);
ret = cbfs_for_each_file(cbfs, prev, fh);
prev = fh;
/* Either failed to read or hit the end of the region. */
if (ret < 0 || ret > 0)
break;
fname = rdev_mmap(&fh->metadata, fsz,
region_device_sz(&fh->metadata) - fsz);
if (fname == NULL)
break;
name_match = !strcmp(fname, name);
rdev_munmap(&fh->metadata, fname);
if (!name_match) {
DEBUG(" Unmatched '%s' at %zx\n", fname,
rdev_relative_offset(cbfs, &fh->metadata));
continue;
}
if (type != NULL) {
uint32_t ftype;
if (rdev_readat(&fh->metadata, &ftype,
offsetof(struct cbfs_file, type),
sizeof(ftype)) != sizeof(ftype))
break;
ftype = read_be32(&ftype);
if (*type != ftype) {
DEBUG(" Unmatched type %x at %zx\n", ftype,
rdev_relative_offset(cbfs,
&fh->metadata));
continue;
}
}
LOG("Found @ offset %zx size %zx\n",
rdev_relative_offset(cbfs, &fh->metadata),
region_device_sz(&fh->data));
/* Success. */
return 0;
}
LOG("'%s' not found.\n", name);
return -1;
}
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