860 lines
18 KiB
C
860 lines
18 KiB
C
// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
|
|
/*
|
|
* libfdt - Flat Device Tree manipulation
|
|
* Copyright (C) 2006 David Gibson, IBM Corporation.
|
|
*/
|
|
#include "libfdt_env.h"
|
|
|
|
#include <fdt.h>
|
|
#include <libfdt.h>
|
|
|
|
#include "libfdt_internal.h"
|
|
|
|
static int fdt_nodename_eq_(const void *fdt, int offset,
|
|
const char *s, int len)
|
|
{
|
|
int olen;
|
|
const char *p = fdt_get_name(fdt, offset, &olen);
|
|
|
|
if (!p || olen < len)
|
|
/* short match */
|
|
return 0;
|
|
|
|
if (memcmp(p, s, len) != 0)
|
|
return 0;
|
|
|
|
if (p[len] == '\0')
|
|
return 1;
|
|
else if (!memchr(s, '@', len) && (p[len] == '@'))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
const char *fdt_get_string(const void *fdt, int stroffset, int *lenp)
|
|
{
|
|
int32_t totalsize;
|
|
uint32_t absoffset;
|
|
size_t len;
|
|
int err;
|
|
const char *s, *n;
|
|
|
|
if (can_assume(VALID_INPUT)) {
|
|
s = (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
|
|
|
|
if (lenp)
|
|
*lenp = strlen(s);
|
|
return s;
|
|
}
|
|
totalsize = fdt_ro_probe_(fdt);
|
|
err = totalsize;
|
|
if (totalsize < 0)
|
|
goto fail;
|
|
|
|
err = -FDT_ERR_BADOFFSET;
|
|
absoffset = stroffset + fdt_off_dt_strings(fdt);
|
|
if (absoffset >= (unsigned)totalsize)
|
|
goto fail;
|
|
len = totalsize - absoffset;
|
|
|
|
if (fdt_magic(fdt) == FDT_MAGIC) {
|
|
if (stroffset < 0)
|
|
goto fail;
|
|
if (can_assume(LATEST) || fdt_version(fdt) >= 17) {
|
|
if ((unsigned)stroffset >= fdt_size_dt_strings(fdt))
|
|
goto fail;
|
|
if ((fdt_size_dt_strings(fdt) - stroffset) < len)
|
|
len = fdt_size_dt_strings(fdt) - stroffset;
|
|
}
|
|
} else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
|
|
unsigned int sw_stroffset = -stroffset;
|
|
|
|
if ((stroffset >= 0) ||
|
|
(sw_stroffset > fdt_size_dt_strings(fdt)))
|
|
goto fail;
|
|
if (sw_stroffset < len)
|
|
len = sw_stroffset;
|
|
} else {
|
|
err = -FDT_ERR_INTERNAL;
|
|
goto fail;
|
|
}
|
|
|
|
s = (const char *)fdt + absoffset;
|
|
n = memchr(s, '\0', len);
|
|
if (!n) {
|
|
/* missing terminating NULL */
|
|
err = -FDT_ERR_TRUNCATED;
|
|
goto fail;
|
|
}
|
|
|
|
if (lenp)
|
|
*lenp = n - s;
|
|
return s;
|
|
|
|
fail:
|
|
if (lenp)
|
|
*lenp = err;
|
|
return NULL;
|
|
}
|
|
|
|
const char *fdt_string(const void *fdt, int stroffset)
|
|
{
|
|
return fdt_get_string(fdt, stroffset, NULL);
|
|
}
|
|
|
|
static int fdt_string_eq_(const void *fdt, int stroffset,
|
|
const char *s, int len)
|
|
{
|
|
int slen;
|
|
const char *p = fdt_get_string(fdt, stroffset, &slen);
|
|
|
|
return p && (slen == len) && (memcmp(p, s, len) == 0);
|
|
}
|
|
|
|
int fdt_find_max_phandle(const void *fdt, uint32_t *phandle)
|
|
{
|
|
uint32_t max = 0;
|
|
int offset = -1;
|
|
|
|
while (true) {
|
|
uint32_t value;
|
|
|
|
offset = fdt_next_node(fdt, offset, NULL);
|
|
if (offset < 0) {
|
|
if (offset == -FDT_ERR_NOTFOUND)
|
|
break;
|
|
|
|
return offset;
|
|
}
|
|
|
|
value = fdt_get_phandle(fdt, offset);
|
|
|
|
if (value > max)
|
|
max = value;
|
|
}
|
|
|
|
if (phandle)
|
|
*phandle = max;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fdt_generate_phandle(const void *fdt, uint32_t *phandle)
|
|
{
|
|
uint32_t max;
|
|
int err;
|
|
|
|
err = fdt_find_max_phandle(fdt, &max);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (max == FDT_MAX_PHANDLE)
|
|
return -FDT_ERR_NOPHANDLES;
|
|
|
|
if (phandle)
|
|
*phandle = max + 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct fdt_reserve_entry *fdt_mem_rsv(const void *fdt, int n)
|
|
{
|
|
unsigned int offset = n * sizeof(struct fdt_reserve_entry);
|
|
unsigned int absoffset = fdt_off_mem_rsvmap(fdt) + offset;
|
|
|
|
if (!can_assume(VALID_INPUT)) {
|
|
if (absoffset < fdt_off_mem_rsvmap(fdt))
|
|
return NULL;
|
|
if (absoffset > fdt_totalsize(fdt) -
|
|
sizeof(struct fdt_reserve_entry))
|
|
return NULL;
|
|
}
|
|
return fdt_mem_rsv_(fdt, n);
|
|
}
|
|
|
|
int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
|
|
{
|
|
const struct fdt_reserve_entry *re;
|
|
|
|
FDT_RO_PROBE(fdt);
|
|
re = fdt_mem_rsv(fdt, n);
|
|
if (!can_assume(VALID_INPUT) && !re)
|
|
return -FDT_ERR_BADOFFSET;
|
|
|
|
*address = fdt64_ld(&re->address);
|
|
*size = fdt64_ld(&re->size);
|
|
return 0;
|
|
}
|
|
|
|
int fdt_num_mem_rsv(const void *fdt)
|
|
{
|
|
int i;
|
|
const struct fdt_reserve_entry *re;
|
|
|
|
for (i = 0; (re = fdt_mem_rsv(fdt, i)) != NULL; i++) {
|
|
if (fdt64_ld(&re->size) == 0)
|
|
return i;
|
|
}
|
|
return -FDT_ERR_TRUNCATED;
|
|
}
|
|
|
|
static int nextprop_(const void *fdt, int offset)
|
|
{
|
|
uint32_t tag;
|
|
int nextoffset;
|
|
|
|
do {
|
|
tag = fdt_next_tag(fdt, offset, &nextoffset);
|
|
|
|
switch (tag) {
|
|
case FDT_END:
|
|
if (nextoffset >= 0)
|
|
return -FDT_ERR_BADSTRUCTURE;
|
|
else
|
|
return nextoffset;
|
|
|
|
case FDT_PROP:
|
|
return offset;
|
|
}
|
|
offset = nextoffset;
|
|
} while (tag == FDT_NOP);
|
|
|
|
return -FDT_ERR_NOTFOUND;
|
|
}
|
|
|
|
int fdt_subnode_offset_namelen(const void *fdt, int offset,
|
|
const char *name, int namelen)
|
|
{
|
|
int depth;
|
|
|
|
FDT_RO_PROBE(fdt);
|
|
|
|
for (depth = 0;
|
|
(offset >= 0) && (depth >= 0);
|
|
offset = fdt_next_node(fdt, offset, &depth))
|
|
if ((depth == 1)
|
|
&& fdt_nodename_eq_(fdt, offset, name, namelen))
|
|
return offset;
|
|
|
|
if (depth < 0)
|
|
return -FDT_ERR_NOTFOUND;
|
|
return offset; /* error */
|
|
}
|
|
|
|
int fdt_subnode_offset(const void *fdt, int parentoffset,
|
|
const char *name)
|
|
{
|
|
return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
|
|
}
|
|
|
|
int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen)
|
|
{
|
|
const char *end = path + namelen;
|
|
const char *p = path;
|
|
int offset = 0;
|
|
|
|
FDT_RO_PROBE(fdt);
|
|
|
|
/* see if we have an alias */
|
|
if (*path != '/') {
|
|
const char *q = memchr(path, '/', end - p);
|
|
|
|
if (!q)
|
|
q = end;
|
|
|
|
p = fdt_get_alias_namelen(fdt, p, q - p);
|
|
if (!p)
|
|
return -FDT_ERR_BADPATH;
|
|
offset = fdt_path_offset(fdt, p);
|
|
|
|
p = q;
|
|
}
|
|
|
|
while (p < end) {
|
|
const char *q;
|
|
|
|
while (*p == '/') {
|
|
p++;
|
|
if (p == end)
|
|
return offset;
|
|
}
|
|
q = memchr(p, '/', end - p);
|
|
if (! q)
|
|
q = end;
|
|
|
|
offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
|
|
if (offset < 0)
|
|
return offset;
|
|
|
|
p = q;
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
int fdt_path_offset(const void *fdt, const char *path)
|
|
{
|
|
return fdt_path_offset_namelen(fdt, path, strlen(path));
|
|
}
|
|
|
|
const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
|
|
{
|
|
const struct fdt_node_header *nh = fdt_offset_ptr_(fdt, nodeoffset);
|
|
const char *nameptr;
|
|
int err;
|
|
|
|
if (((err = fdt_ro_probe_(fdt)) < 0)
|
|
|| ((err = fdt_check_node_offset_(fdt, nodeoffset)) < 0))
|
|
goto fail;
|
|
|
|
nameptr = nh->name;
|
|
|
|
if (!can_assume(LATEST) && fdt_version(fdt) < 0x10) {
|
|
/*
|
|
* For old FDT versions, match the naming conventions of V16:
|
|
* give only the leaf name (after all /). The actual tree
|
|
* contents are loosely checked.
|
|
*/
|
|
const char *leaf;
|
|
leaf = strrchr(nameptr, '/');
|
|
if (leaf == NULL) {
|
|
err = -FDT_ERR_BADSTRUCTURE;
|
|
goto fail;
|
|
}
|
|
nameptr = leaf+1;
|
|
}
|
|
|
|
if (len)
|
|
*len = strlen(nameptr);
|
|
|
|
return nameptr;
|
|
|
|
fail:
|
|
if (len)
|
|
*len = err;
|
|
return NULL;
|
|
}
|
|
|
|
int fdt_first_property_offset(const void *fdt, int nodeoffset)
|
|
{
|
|
int offset;
|
|
|
|
if ((offset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
|
|
return offset;
|
|
|
|
return nextprop_(fdt, offset);
|
|
}
|
|
|
|
int fdt_next_property_offset(const void *fdt, int offset)
|
|
{
|
|
if ((offset = fdt_check_prop_offset_(fdt, offset)) < 0)
|
|
return offset;
|
|
|
|
return nextprop_(fdt, offset);
|
|
}
|
|
|
|
static const struct fdt_property *fdt_get_property_by_offset_(const void *fdt,
|
|
int offset,
|
|
int *lenp)
|
|
{
|
|
int err;
|
|
const struct fdt_property *prop;
|
|
|
|
if (!can_assume(VALID_INPUT) &&
|
|
(err = fdt_check_prop_offset_(fdt, offset)) < 0) {
|
|
if (lenp)
|
|
*lenp = err;
|
|
return NULL;
|
|
}
|
|
|
|
prop = fdt_offset_ptr_(fdt, offset);
|
|
|
|
if (lenp)
|
|
*lenp = fdt32_ld(&prop->len);
|
|
|
|
return prop;
|
|
}
|
|
|
|
const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
|
|
int offset,
|
|
int *lenp)
|
|
{
|
|
/* Prior to version 16, properties may need realignment
|
|
* and this API does not work. fdt_getprop_*() will, however. */
|
|
|
|
if (!can_assume(LATEST) && fdt_version(fdt) < 0x10) {
|
|
if (lenp)
|
|
*lenp = -FDT_ERR_BADVERSION;
|
|
return NULL;
|
|
}
|
|
|
|
return fdt_get_property_by_offset_(fdt, offset, lenp);
|
|
}
|
|
|
|
static const struct fdt_property *fdt_get_property_namelen_(const void *fdt,
|
|
int offset,
|
|
const char *name,
|
|
int namelen,
|
|
int *lenp,
|
|
int *poffset)
|
|
{
|
|
for (offset = fdt_first_property_offset(fdt, offset);
|
|
(offset >= 0);
|
|
(offset = fdt_next_property_offset(fdt, offset))) {
|
|
const struct fdt_property *prop;
|
|
|
|
prop = fdt_get_property_by_offset_(fdt, offset, lenp);
|
|
if (!can_assume(LIBFDT_FLAWLESS) && !prop) {
|
|
offset = -FDT_ERR_INTERNAL;
|
|
break;
|
|
}
|
|
if (fdt_string_eq_(fdt, fdt32_ld(&prop->nameoff),
|
|
name, namelen)) {
|
|
if (poffset)
|
|
*poffset = offset;
|
|
return prop;
|
|
}
|
|
}
|
|
|
|
if (lenp)
|
|
*lenp = offset;
|
|
return NULL;
|
|
}
|
|
|
|
|
|
const struct fdt_property *fdt_get_property_namelen(const void *fdt,
|
|
int offset,
|
|
const char *name,
|
|
int namelen, int *lenp)
|
|
{
|
|
/* Prior to version 16, properties may need realignment
|
|
* and this API does not work. fdt_getprop_*() will, however. */
|
|
if (!can_assume(LATEST) && fdt_version(fdt) < 0x10) {
|
|
if (lenp)
|
|
*lenp = -FDT_ERR_BADVERSION;
|
|
return NULL;
|
|
}
|
|
|
|
return fdt_get_property_namelen_(fdt, offset, name, namelen, lenp,
|
|
NULL);
|
|
}
|
|
|
|
|
|
const struct fdt_property *fdt_get_property(const void *fdt,
|
|
int nodeoffset,
|
|
const char *name, int *lenp)
|
|
{
|
|
return fdt_get_property_namelen(fdt, nodeoffset, name,
|
|
strlen(name), lenp);
|
|
}
|
|
|
|
const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
|
|
const char *name, int namelen, int *lenp)
|
|
{
|
|
int poffset;
|
|
const struct fdt_property *prop;
|
|
|
|
prop = fdt_get_property_namelen_(fdt, nodeoffset, name, namelen, lenp,
|
|
&poffset);
|
|
if (!prop)
|
|
return NULL;
|
|
|
|
/* Handle realignment */
|
|
if (!can_assume(LATEST) && fdt_version(fdt) < 0x10 &&
|
|
(poffset + sizeof(*prop)) % 8 && fdt32_ld(&prop->len) >= 8)
|
|
return prop->data + 4;
|
|
return prop->data;
|
|
}
|
|
|
|
const void *fdt_getprop_by_offset(const void *fdt, int offset,
|
|
const char **namep, int *lenp)
|
|
{
|
|
const struct fdt_property *prop;
|
|
|
|
prop = fdt_get_property_by_offset_(fdt, offset, lenp);
|
|
if (!prop)
|
|
return NULL;
|
|
if (namep) {
|
|
const char *name;
|
|
int namelen;
|
|
|
|
if (!can_assume(VALID_INPUT)) {
|
|
name = fdt_get_string(fdt, fdt32_ld(&prop->nameoff),
|
|
&namelen);
|
|
if (!name) {
|
|
if (lenp)
|
|
*lenp = namelen;
|
|
return NULL;
|
|
}
|
|
*namep = name;
|
|
} else {
|
|
*namep = fdt_string(fdt, fdt32_ld(&prop->nameoff));
|
|
}
|
|
}
|
|
|
|
/* Handle realignment */
|
|
if (!can_assume(LATEST) && fdt_version(fdt) < 0x10 &&
|
|
(offset + sizeof(*prop)) % 8 && fdt32_ld(&prop->len) >= 8)
|
|
return prop->data + 4;
|
|
return prop->data;
|
|
}
|
|
|
|
const void *fdt_getprop(const void *fdt, int nodeoffset,
|
|
const char *name, int *lenp)
|
|
{
|
|
return fdt_getprop_namelen(fdt, nodeoffset, name, strlen(name), lenp);
|
|
}
|
|
|
|
uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
|
|
{
|
|
const fdt32_t *php;
|
|
int len;
|
|
|
|
/* FIXME: This is a bit sub-optimal, since we potentially scan
|
|
* over all the properties twice. */
|
|
php = fdt_getprop(fdt, nodeoffset, "phandle", &len);
|
|
if (!php || (len != sizeof(*php))) {
|
|
php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
|
|
if (!php || (len != sizeof(*php)))
|
|
return 0;
|
|
}
|
|
|
|
return fdt32_ld(php);
|
|
}
|
|
|
|
const char *fdt_get_alias_namelen(const void *fdt,
|
|
const char *name, int namelen)
|
|
{
|
|
int aliasoffset;
|
|
|
|
aliasoffset = fdt_path_offset(fdt, "/aliases");
|
|
if (aliasoffset < 0)
|
|
return NULL;
|
|
|
|
return fdt_getprop_namelen(fdt, aliasoffset, name, namelen, NULL);
|
|
}
|
|
|
|
const char *fdt_get_alias(const void *fdt, const char *name)
|
|
{
|
|
return fdt_get_alias_namelen(fdt, name, strlen(name));
|
|
}
|
|
|
|
int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
|
|
{
|
|
int pdepth = 0, p = 0;
|
|
int offset, depth, namelen;
|
|
const char *name;
|
|
|
|
FDT_RO_PROBE(fdt);
|
|
|
|
if (buflen < 2)
|
|
return -FDT_ERR_NOSPACE;
|
|
|
|
for (offset = 0, depth = 0;
|
|
(offset >= 0) && (offset <= nodeoffset);
|
|
offset = fdt_next_node(fdt, offset, &depth)) {
|
|
while (pdepth > depth) {
|
|
do {
|
|
p--;
|
|
} while (buf[p-1] != '/');
|
|
pdepth--;
|
|
}
|
|
|
|
if (pdepth >= depth) {
|
|
name = fdt_get_name(fdt, offset, &namelen);
|
|
if (!name)
|
|
return namelen;
|
|
if ((p + namelen + 1) <= buflen) {
|
|
memcpy(buf + p, name, namelen);
|
|
p += namelen;
|
|
buf[p++] = '/';
|
|
pdepth++;
|
|
}
|
|
}
|
|
|
|
if (offset == nodeoffset) {
|
|
if (pdepth < (depth + 1))
|
|
return -FDT_ERR_NOSPACE;
|
|
|
|
if (p > 1) /* special case so that root path is "/", not "" */
|
|
p--;
|
|
buf[p] = '\0';
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
|
|
return -FDT_ERR_BADOFFSET;
|
|
else if (offset == -FDT_ERR_BADOFFSET)
|
|
return -FDT_ERR_BADSTRUCTURE;
|
|
|
|
return offset; /* error from fdt_next_node() */
|
|
}
|
|
|
|
int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
|
|
int supernodedepth, int *nodedepth)
|
|
{
|
|
int offset, depth;
|
|
int supernodeoffset = -FDT_ERR_INTERNAL;
|
|
|
|
FDT_RO_PROBE(fdt);
|
|
|
|
if (supernodedepth < 0)
|
|
return -FDT_ERR_NOTFOUND;
|
|
|
|
for (offset = 0, depth = 0;
|
|
(offset >= 0) && (offset <= nodeoffset);
|
|
offset = fdt_next_node(fdt, offset, &depth)) {
|
|
if (depth == supernodedepth)
|
|
supernodeoffset = offset;
|
|
|
|
if (offset == nodeoffset) {
|
|
if (nodedepth)
|
|
*nodedepth = depth;
|
|
|
|
if (supernodedepth > depth)
|
|
return -FDT_ERR_NOTFOUND;
|
|
else
|
|
return supernodeoffset;
|
|
}
|
|
}
|
|
|
|
if (!can_assume(VALID_INPUT)) {
|
|
if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
|
|
return -FDT_ERR_BADOFFSET;
|
|
else if (offset == -FDT_ERR_BADOFFSET)
|
|
return -FDT_ERR_BADSTRUCTURE;
|
|
}
|
|
|
|
return offset; /* error from fdt_next_node() */
|
|
}
|
|
|
|
int fdt_node_depth(const void *fdt, int nodeoffset)
|
|
{
|
|
int nodedepth;
|
|
int err;
|
|
|
|
err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
|
|
if (err)
|
|
return (can_assume(LIBFDT_FLAWLESS) || err < 0) ? err :
|
|
-FDT_ERR_INTERNAL;
|
|
return nodedepth;
|
|
}
|
|
|
|
int fdt_parent_offset(const void *fdt, int nodeoffset)
|
|
{
|
|
int nodedepth = fdt_node_depth(fdt, nodeoffset);
|
|
|
|
if (nodedepth < 0)
|
|
return nodedepth;
|
|
return fdt_supernode_atdepth_offset(fdt, nodeoffset,
|
|
nodedepth - 1, NULL);
|
|
}
|
|
|
|
int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
|
|
const char *propname,
|
|
const void *propval, int proplen)
|
|
{
|
|
int offset;
|
|
const void *val;
|
|
int len;
|
|
|
|
FDT_RO_PROBE(fdt);
|
|
|
|
/* FIXME: The algorithm here is pretty horrible: we scan each
|
|
* property of a node in fdt_getprop(), then if that didn't
|
|
* find what we want, we scan over them again making our way
|
|
* to the next node. Still it's the easiest to implement
|
|
* approach; performance can come later. */
|
|
for (offset = fdt_next_node(fdt, startoffset, NULL);
|
|
offset >= 0;
|
|
offset = fdt_next_node(fdt, offset, NULL)) {
|
|
val = fdt_getprop(fdt, offset, propname, &len);
|
|
if (val && (len == proplen)
|
|
&& (memcmp(val, propval, len) == 0))
|
|
return offset;
|
|
}
|
|
|
|
return offset; /* error from fdt_next_node() */
|
|
}
|
|
|
|
int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
|
|
{
|
|
int offset;
|
|
|
|
if ((phandle == 0) || (phandle == ~0U))
|
|
return -FDT_ERR_BADPHANDLE;
|
|
|
|
FDT_RO_PROBE(fdt);
|
|
|
|
/* FIXME: The algorithm here is pretty horrible: we
|
|
* potentially scan each property of a node in
|
|
* fdt_get_phandle(), then if that didn't find what
|
|
* we want, we scan over them again making our way to the next
|
|
* node. Still it's the easiest to implement approach;
|
|
* performance can come later. */
|
|
for (offset = fdt_next_node(fdt, -1, NULL);
|
|
offset >= 0;
|
|
offset = fdt_next_node(fdt, offset, NULL)) {
|
|
if (fdt_get_phandle(fdt, offset) == phandle)
|
|
return offset;
|
|
}
|
|
|
|
return offset; /* error from fdt_next_node() */
|
|
}
|
|
|
|
int fdt_stringlist_contains(const char *strlist, int listlen, const char *str)
|
|
{
|
|
int len = strlen(str);
|
|
const char *p;
|
|
|
|
while (listlen >= len) {
|
|
if (memcmp(str, strlist, len+1) == 0)
|
|
return 1;
|
|
p = memchr(strlist, '\0', listlen);
|
|
if (!p)
|
|
return 0; /* malformed strlist.. */
|
|
listlen -= (p-strlist) + 1;
|
|
strlist = p + 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property)
|
|
{
|
|
const char *list, *end;
|
|
int length, count = 0;
|
|
|
|
list = fdt_getprop(fdt, nodeoffset, property, &length);
|
|
if (!list)
|
|
return length;
|
|
|
|
end = list + length;
|
|
|
|
while (list < end) {
|
|
length = strnlen(list, end - list) + 1;
|
|
|
|
/* Abort if the last string isn't properly NUL-terminated. */
|
|
if (list + length > end)
|
|
return -FDT_ERR_BADVALUE;
|
|
|
|
list += length;
|
|
count++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property,
|
|
const char *string)
|
|
{
|
|
int length, len, idx = 0;
|
|
const char *list, *end;
|
|
|
|
list = fdt_getprop(fdt, nodeoffset, property, &length);
|
|
if (!list)
|
|
return length;
|
|
|
|
len = strlen(string) + 1;
|
|
end = list + length;
|
|
|
|
while (list < end) {
|
|
length = strnlen(list, end - list) + 1;
|
|
|
|
/* Abort if the last string isn't properly NUL-terminated. */
|
|
if (list + length > end)
|
|
return -FDT_ERR_BADVALUE;
|
|
|
|
if (length == len && memcmp(list, string, length) == 0)
|
|
return idx;
|
|
|
|
list += length;
|
|
idx++;
|
|
}
|
|
|
|
return -FDT_ERR_NOTFOUND;
|
|
}
|
|
|
|
const char *fdt_stringlist_get(const void *fdt, int nodeoffset,
|
|
const char *property, int idx,
|
|
int *lenp)
|
|
{
|
|
const char *list, *end;
|
|
int length;
|
|
|
|
list = fdt_getprop(fdt, nodeoffset, property, &length);
|
|
if (!list) {
|
|
if (lenp)
|
|
*lenp = length;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
end = list + length;
|
|
|
|
while (list < end) {
|
|
length = strnlen(list, end - list) + 1;
|
|
|
|
/* Abort if the last string isn't properly NUL-terminated. */
|
|
if (list + length > end) {
|
|
if (lenp)
|
|
*lenp = -FDT_ERR_BADVALUE;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
if (idx == 0) {
|
|
if (lenp)
|
|
*lenp = length - 1;
|
|
|
|
return list;
|
|
}
|
|
|
|
list += length;
|
|
idx--;
|
|
}
|
|
|
|
if (lenp)
|
|
*lenp = -FDT_ERR_NOTFOUND;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int fdt_node_check_compatible(const void *fdt, int nodeoffset,
|
|
const char *compatible)
|
|
{
|
|
const void *prop;
|
|
int len;
|
|
|
|
prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
|
|
if (!prop)
|
|
return len;
|
|
|
|
return !fdt_stringlist_contains(prop, len, compatible);
|
|
}
|
|
|
|
int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
|
|
const char *compatible)
|
|
{
|
|
int offset, err;
|
|
|
|
FDT_RO_PROBE(fdt);
|
|
|
|
/* FIXME: The algorithm here is pretty horrible: we scan each
|
|
* property of a node in fdt_node_check_compatible(), then if
|
|
* that didn't find what we want, we scan over them again
|
|
* making our way to the next node. Still it's the easiest to
|
|
* implement approach; performance can come later. */
|
|
for (offset = fdt_next_node(fdt, startoffset, NULL);
|
|
offset >= 0;
|
|
offset = fdt_next_node(fdt, offset, NULL)) {
|
|
err = fdt_node_check_compatible(fdt, offset, compatible);
|
|
if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
|
|
return err;
|
|
else if (err == 0)
|
|
return offset;
|
|
}
|
|
|
|
return offset; /* error from fdt_next_node() */
|
|
}
|