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audk/EmbeddedPkg/Library/FdtLib/fdt_overlay.c

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/*
* libfdt - Flat Device Tree manipulation
* Copyright (C) 2016 Free Electrons
* Copyright (C) 2016 NextThing Co.
*
* libfdt is dual licensed: you can use it either under the terms of
* the GPL, or the BSD license, at your option.
*
* a) This library 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 library 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 library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* Alternatively,
*
* b) Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "libfdt_env.h"
#include <fdt.h>
#include <libfdt.h>
#include "libfdt_internal.h"
/**
* overlay_get_target_phandle - retrieves the target phandle of a fragment
* @fdto: pointer to the device tree overlay blob
* @fragment: node offset of the fragment in the overlay
*
* overlay_get_target_phandle() retrieves the target phandle of an
* overlay fragment when that fragment uses a phandle (target
* property) instead of a path (target-path property).
*
* returns:
* the phandle pointed by the target property
* 0, if the phandle was not found
* -1, if the phandle was malformed
*/
static uint32_t
overlay_get_target_phandle (
const void *fdto,
int fragment
)
{
const fdt32_t *val;
int len;
val = fdt_getprop (fdto, fragment, "target", &len);
if (!val) {
return 0;
}
if ((len != sizeof (*val)) || (fdt32_to_cpu (*val) == (uint32_t)-1)) {
return (uint32_t)-1;
}
return fdt32_to_cpu (*val);
}
/**
* overlay_get_target - retrieves the offset of a fragment's target
* @fdt: Base device tree blob
* @fdto: Device tree overlay blob
* @fragment: node offset of the fragment in the overlay
* @pathp: pointer which receives the path of the target (or NULL)
*
* overlay_get_target() retrieves the target offset in the base
* device tree of a fragment, no matter how the actual targetting is
* done (through a phandle or a path)
*
* returns:
* the targetted node offset in the base device tree
* Negative error code on error
*/
static int
overlay_get_target (
const void *fdt,
const void *fdto,
int fragment,
char const **pathp
)
{
uint32_t phandle;
const char *path = NULL;
int path_len = 0, ret;
/* Try first to do a phandle based lookup */
phandle = overlay_get_target_phandle (fdto, fragment);
if (phandle == (uint32_t)-1) {
return -FDT_ERR_BADPHANDLE;
}
/* no phandle, try path */
if (!phandle) {
/* And then a path based lookup */
path = fdt_getprop (fdto, fragment, "target-path", &path_len);
if (path) {
ret = fdt_path_offset (fdt, path);
} else {
ret = path_len;
}
} else {
ret = fdt_node_offset_by_phandle (fdt, phandle);
}
/*
* If we haven't found either a target or a
* target-path property in a node that contains a
* __overlay__ subnode (we wouldn't be called
* otherwise), consider it a improperly written
* overlay
*/
if ((ret < 0) && (path_len == -FDT_ERR_NOTFOUND)) {
ret = -FDT_ERR_BADOVERLAY;
}
/* return on error */
if (ret < 0) {
return ret;
}
/* return pointer to path (if available) */
if (pathp) {
*pathp = path ? path : NULL;
}
return ret;
}
/**
* overlay_phandle_add_offset - Increases a phandle by an offset
* @fdt: Base device tree blob
* @node: Device tree overlay blob
* @name: Name of the property to modify (phandle or linux,phandle)
* @delta: offset to apply
*
* overlay_phandle_add_offset() increments a node phandle by a given
* offset.
*
* returns:
* 0 on success.
* Negative error code on error
*/
static int
overlay_phandle_add_offset (
void *fdt,
int node,
const char *name,
uint32_t delta
)
{
const fdt32_t *val;
uint32_t adj_val;
int len;
val = fdt_getprop (fdt, node, name, &len);
if (!val) {
return len;
}
if (len != sizeof (*val)) {
return -FDT_ERR_BADPHANDLE;
}
adj_val = fdt32_to_cpu (*val);
if ((adj_val + delta) < adj_val) {
return -FDT_ERR_NOPHANDLES;
}
adj_val += delta;
if (adj_val == (uint32_t)-1) {
return -FDT_ERR_NOPHANDLES;
}
return fdt_setprop_inplace_u32 (fdt, node, name, adj_val);
}
/**
* overlay_adjust_node_phandles - Offsets the phandles of a node
* @fdto: Device tree overlay blob
* @node: Offset of the node we want to adjust
* @delta: Offset to shift the phandles of
*
* overlay_adjust_node_phandles() adds a constant to all the phandles
* of a given node. This is mainly use as part of the overlay
* application process, when we want to update all the overlay
* phandles to not conflict with the overlays of the base device tree.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_adjust_node_phandles (
void *fdto,
int node,
uint32_t delta
)
{
int child;
int ret;
ret = overlay_phandle_add_offset (fdto, node, "phandle", delta);
if (ret && (ret != -FDT_ERR_NOTFOUND)) {
return ret;
}
ret = overlay_phandle_add_offset (fdto, node, "linux,phandle", delta);
if (ret && (ret != -FDT_ERR_NOTFOUND)) {
return ret;
}
fdt_for_each_subnode (child, fdto, node) {
ret = overlay_adjust_node_phandles (fdto, child, delta);
if (ret) {
return ret;
}
}
return 0;
}
/**
* overlay_adjust_local_phandles - Adjust the phandles of a whole overlay
* @fdto: Device tree overlay blob
* @delta: Offset to shift the phandles of
*
* overlay_adjust_local_phandles() adds a constant to all the
* phandles of an overlay. This is mainly use as part of the overlay
* application process, when we want to update all the overlay
* phandles to not conflict with the overlays of the base device tree.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_adjust_local_phandles (
void *fdto,
uint32_t delta
)
{
/*
* Start adjusting the phandles from the overlay root
*/
return overlay_adjust_node_phandles (fdto, 0, delta);
}
/**
* overlay_update_local_node_references - Adjust the overlay references
* @fdto: Device tree overlay blob
* @tree_node: Node offset of the node to operate on
* @fixup_node: Node offset of the matching local fixups node
* @delta: Offset to shift the phandles of
*
* overlay_update_local_nodes_references() update the phandles
* pointing to a node within the device tree overlay by adding a
* constant delta.
*
* This is mainly used as part of a device tree application process,
* where you want the device tree overlays phandles to not conflict
* with the ones from the base device tree before merging them.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_update_local_node_references (
void *fdto,
int tree_node,
int fixup_node,
uint32_t delta
)
{
int fixup_prop;
int fixup_child;
int ret;
fdt_for_each_property_offset (fixup_prop, fdto, fixup_node) {
const fdt32_t *fixup_val;
const char *tree_val;
const char *name;
int fixup_len;
int tree_len;
int i;
fixup_val = fdt_getprop_by_offset (
fdto,
fixup_prop,
&name,
&fixup_len
);
if (!fixup_val) {
return fixup_len;
}
if (fixup_len % sizeof (uint32_t)) {
return -FDT_ERR_BADOVERLAY;
}
tree_val = fdt_getprop (fdto, tree_node, name, &tree_len);
if (!tree_val) {
if (tree_len == -FDT_ERR_NOTFOUND) {
return -FDT_ERR_BADOVERLAY;
}
return tree_len;
}
for (i = 0; i < (fixup_len / sizeof (uint32_t)); i++) {
fdt32_t adj_val;
uint32_t poffset;
poffset = fdt32_to_cpu (fixup_val[i]);
/*
* phandles to fixup can be unaligned.
*
* Use a memcpy for the architectures that do
* not support unaligned accesses.
*/
memcpy (&adj_val, tree_val + poffset, sizeof (adj_val));
adj_val = cpu_to_fdt32 (fdt32_to_cpu (adj_val) + delta);
ret = fdt_setprop_inplace_namelen_partial (
fdto,
tree_node,
name,
strlen (name),
poffset,
&adj_val,
sizeof (adj_val)
);
if (ret == -FDT_ERR_NOSPACE) {
return -FDT_ERR_BADOVERLAY;
}
if (ret) {
return ret;
}
}
}
fdt_for_each_subnode (fixup_child, fdto, fixup_node) {
const char *fixup_child_name = fdt_get_name (
fdto,
fixup_child,
NULL
);
int tree_child;
tree_child = fdt_subnode_offset (
fdto,
tree_node,
fixup_child_name
);
if (tree_child == -FDT_ERR_NOTFOUND) {
return -FDT_ERR_BADOVERLAY;
}
if (tree_child < 0) {
return tree_child;
}
ret = overlay_update_local_node_references (
fdto,
tree_child,
fixup_child,
delta
);
if (ret) {
return ret;
}
}
return 0;
}
/**
* overlay_update_local_references - Adjust the overlay references
* @fdto: Device tree overlay blob
* @delta: Offset to shift the phandles of
*
* overlay_update_local_references() update all the phandles pointing
* to a node within the device tree overlay by adding a constant
* delta to not conflict with the base overlay.
*
* This is mainly used as part of a device tree application process,
* where you want the device tree overlays phandles to not conflict
* with the ones from the base device tree before merging them.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_update_local_references (
void *fdto,
uint32_t delta
)
{
int fixups;
fixups = fdt_path_offset (fdto, "/__local_fixups__");
if (fixups < 0) {
/* There's no local phandles to adjust, bail out */
if (fixups == -FDT_ERR_NOTFOUND) {
return 0;
}
return fixups;
}
/*
* Update our local references from the root of the tree
*/
return overlay_update_local_node_references (
fdto,
0,
fixups,
delta
);
}
/**
* overlay_fixup_one_phandle - Set an overlay phandle to the base one
* @fdt: Base Device Tree blob
* @fdto: Device tree overlay blob
* @symbols_off: Node offset of the symbols node in the base device tree
* @path: Path to a node holding a phandle in the overlay
* @path_len: number of path characters to consider
* @name: Name of the property holding the phandle reference in the overlay
* @name_len: number of name characters to consider
* @poffset: Offset within the overlay property where the phandle is stored
* @label: Label of the node referenced by the phandle
*
* overlay_fixup_one_phandle() resolves an overlay phandle pointing to
* a node in the base device tree.
*
* This is part of the device tree overlay application process, when
* you want all the phandles in the overlay to point to the actual
* base dt nodes.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_fixup_one_phandle (
void *fdt,
void *fdto,
int symbols_off,
const char *path,
uint32_t path_len,
const char *name,
uint32_t name_len,
int poffset,
const char *label
)
{
const char *symbol_path;
uint32_t phandle;
fdt32_t phandle_prop;
int symbol_off, fixup_off;
int prop_len;
if (symbols_off < 0) {
return symbols_off;
}
symbol_path = fdt_getprop (
fdt,
symbols_off,
label,
&prop_len
);
if (!symbol_path) {
return prop_len;
}
symbol_off = fdt_path_offset (fdt, symbol_path);
if (symbol_off < 0) {
return symbol_off;
}
phandle = fdt_get_phandle (fdt, symbol_off);
if (!phandle) {
return -FDT_ERR_NOTFOUND;
}
fixup_off = fdt_path_offset_namelen (fdto, path, path_len);
if (fixup_off == -FDT_ERR_NOTFOUND) {
return -FDT_ERR_BADOVERLAY;
}
if (fixup_off < 0) {
return fixup_off;
}
phandle_prop = cpu_to_fdt32 (phandle);
return fdt_setprop_inplace_namelen_partial (
fdto,
fixup_off,
name,
name_len,
poffset,
&phandle_prop,
sizeof (phandle_prop)
);
}
unsigned long
strtoul (
const char *nptr,
char **endptr,
int base
);
/**
* overlay_fixup_phandle - Set an overlay phandle to the base one
* @fdt: Base Device Tree blob
* @fdto: Device tree overlay blob
* @symbols_off: Node offset of the symbols node in the base device tree
* @property: Property offset in the overlay holding the list of fixups
*
* overlay_fixup_phandle() resolves all the overlay phandles pointed
* to in a __fixups__ property, and updates them to match the phandles
* in use in the base device tree.
*
* This is part of the device tree overlay application process, when
* you want all the phandles in the overlay to point to the actual
* base dt nodes.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_fixup_phandle (
void *fdt,
void *fdto,
int symbols_off,
int property
)
{
const char *value;
const char *label;
int len;
value = fdt_getprop_by_offset (
fdto,
property,
&label,
&len
);
if (!value) {
if (len == -FDT_ERR_NOTFOUND) {
return -FDT_ERR_INTERNAL;
}
return len;
}
do {
const char *path, *name, *fixup_end;
const char *fixup_str = value;
uint32_t path_len, name_len;
uint32_t fixup_len;
char *sep, *endptr;
int poffset, ret;
fixup_end = memchr (value, '\0', len);
if (!fixup_end) {
return -FDT_ERR_BADOVERLAY;
}
fixup_len = fixup_end - fixup_str;
len -= fixup_len + 1;
value += fixup_len + 1;
path = fixup_str;
sep = memchr (fixup_str, ':', fixup_len);
if (!sep || (*sep != ':')) {
return -FDT_ERR_BADOVERLAY;
}
path_len = sep - path;
if (path_len == (fixup_len - 1)) {
return -FDT_ERR_BADOVERLAY;
}
fixup_len -= path_len + 1;
name = sep + 1;
sep = memchr (name, ':', fixup_len);
if (!sep || (*sep != ':')) {
return -FDT_ERR_BADOVERLAY;
}
name_len = sep - name;
if (!name_len) {
return -FDT_ERR_BADOVERLAY;
}
poffset = strtoul (sep + 1, &endptr, 10);
if ((*endptr != '\0') || (endptr <= (sep + 1))) {
return -FDT_ERR_BADOVERLAY;
}
ret = overlay_fixup_one_phandle (
fdt,
fdto,
symbols_off,
path,
path_len,
name,
name_len,
poffset,
label
);
if (ret) {
return ret;
}
} while (len > 0);
return 0;
}
/**
* overlay_fixup_phandles - Resolve the overlay phandles to the base
* device tree
* @fdt: Base Device Tree blob
* @fdto: Device tree overlay blob
*
* overlay_fixup_phandles() resolves all the overlay phandles pointing
* to nodes in the base device tree.
*
* This is one of the steps of the device tree overlay application
* process, when you want all the phandles in the overlay to point to
* the actual base dt nodes.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_fixup_phandles (
void *fdt,
void *fdto
)
{
int fixups_off, symbols_off;
int property;
/* We can have overlays without any fixups */
fixups_off = fdt_path_offset (fdto, "/__fixups__");
if (fixups_off == -FDT_ERR_NOTFOUND) {
return 0; /* nothing to do */
}
if (fixups_off < 0) {
return fixups_off;
}
/* And base DTs without symbols */
symbols_off = fdt_path_offset (fdt, "/__symbols__");
if (((symbols_off < 0) && (symbols_off != -FDT_ERR_NOTFOUND))) {
return symbols_off;
}
fdt_for_each_property_offset (property, fdto, fixups_off) {
int ret;
ret = overlay_fixup_phandle (fdt, fdto, symbols_off, property);
if (ret) {
return ret;
}
}
return 0;
}
/**
* overlay_apply_node - Merges a node into the base device tree
* @fdt: Base Device Tree blob
* @target: Node offset in the base device tree to apply the fragment to
* @fdto: Device tree overlay blob
* @node: Node offset in the overlay holding the changes to merge
*
* overlay_apply_node() merges a node into a target base device tree
* node pointed.
*
* This is part of the final step in the device tree overlay
* application process, when all the phandles have been adjusted and
* resolved and you just have to merge overlay into the base device
* tree.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_apply_node (
void *fdt,
int target,
void *fdto,
int node
)
{
int property;
int subnode;
fdt_for_each_property_offset (property, fdto, node) {
const char *name;
const void *prop;
int prop_len;
int ret;
prop = fdt_getprop_by_offset (
fdto,
property,
&name,
&prop_len
);
if (prop_len == -FDT_ERR_NOTFOUND) {
return -FDT_ERR_INTERNAL;
}
if (prop_len < 0) {
return prop_len;
}
ret = fdt_setprop (fdt, target, name, prop, prop_len);
if (ret) {
return ret;
}
}
fdt_for_each_subnode (subnode, fdto, node) {
const char *name = fdt_get_name (fdto, subnode, NULL);
int nnode;
int ret;
nnode = fdt_add_subnode (fdt, target, name);
if (nnode == -FDT_ERR_EXISTS) {
nnode = fdt_subnode_offset (fdt, target, name);
if (nnode == -FDT_ERR_NOTFOUND) {
return -FDT_ERR_INTERNAL;
}
}
if (nnode < 0) {
return nnode;
}
ret = overlay_apply_node (fdt, nnode, fdto, subnode);
if (ret) {
return ret;
}
}
return 0;
}
/**
* overlay_merge - Merge an overlay into its base device tree
* @fdt: Base Device Tree blob
* @fdto: Device tree overlay blob
*
* overlay_merge() merges an overlay into its base device tree.
*
* This is the next to last step in the device tree overlay application
* process, when all the phandles have been adjusted and resolved and
* you just have to merge overlay into the base device tree.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_merge (
void *fdt,
void *fdto
)
{
int fragment;
fdt_for_each_subnode (fragment, fdto, 0) {
int overlay;
int target;
int ret;
/*
* Each fragments will have an __overlay__ node. If
* they don't, it's not supposed to be merged
*/
overlay = fdt_subnode_offset (fdto, fragment, "__overlay__");
if (overlay == -FDT_ERR_NOTFOUND) {
continue;
}
if (overlay < 0) {
return overlay;
}
target = overlay_get_target (fdt, fdto, fragment, NULL);
if (target < 0) {
return target;
}
ret = overlay_apply_node (fdt, target, fdto, overlay);
if (ret) {
return ret;
}
}
return 0;
}
static int
get_path_len (
const void *fdt,
int nodeoffset
)
{
int len = 0, namelen;
const char *name;
FDT_CHECK_HEADER (fdt);
for ( ; ;) {
name = fdt_get_name (fdt, nodeoffset, &namelen);
if (!name) {
return namelen;
}
/* root? we're done */
if (namelen == 0) {
break;
}
nodeoffset = fdt_parent_offset (fdt, nodeoffset);
if (nodeoffset < 0) {
return nodeoffset;
}
len += namelen + 1;
}
/* in case of root pretend it's "/" */
if (len == 0) {
len++;
}
return len;
}
/**
* overlay_symbol_update - Update the symbols of base tree after a merge
* @fdt: Base Device Tree blob
* @fdto: Device tree overlay blob
*
* overlay_symbol_update() updates the symbols of the base tree with the
* symbols of the applied overlay
*
* This is the last step in the device tree overlay application
* process, allowing the reference of overlay symbols by subsequent
* overlay operations.
*
* returns:
* 0 on success
* Negative error code on failure
*/
static int
overlay_symbol_update (
void *fdt,
void *fdto
)
{
int root_sym, ov_sym, prop, path_len, fragment, target;
int len, frag_name_len, ret, rel_path_len;
const char *s, *e;
const char *path;
const char *name;
const char *frag_name;
const char *rel_path;
const char *target_path;
char *buf;
void *p;
ov_sym = fdt_subnode_offset (fdto, 0, "__symbols__");
/* if no overlay symbols exist no problem */
if (ov_sym < 0) {
return 0;
}
root_sym = fdt_subnode_offset (fdt, 0, "__symbols__");
/* it no root symbols exist we should create them */
if (root_sym == -FDT_ERR_NOTFOUND) {
root_sym = fdt_add_subnode (fdt, 0, "__symbols__");
}
/* any error is fatal now */
if (root_sym < 0) {
return root_sym;
}
/* iterate over each overlay symbol */
fdt_for_each_property_offset (prop, fdto, ov_sym) {
path = fdt_getprop_by_offset (fdto, prop, &name, &path_len);
if (!path) {
return path_len;
}
/* verify it's a string property (terminated by a single \0) */
if ((path_len < 1) || (memchr (path, '\0', path_len) != &path[path_len - 1])) {
return -FDT_ERR_BADVALUE;
}
/* keep end marker to avoid strlen() */
e = path + path_len;
/* format: /<fragment-name>/__overlay__/<relative-subnode-path> */
if (*path != '/') {
return -FDT_ERR_BADVALUE;
}
/* get fragment name first */
s = strchr (path + 1, '/');
if (!s) {
return -FDT_ERR_BADOVERLAY;
}
frag_name = path + 1;
frag_name_len = s - path - 1;
/* verify format; safe since "s" lies in \0 terminated prop */
len = sizeof ("/__overlay__/") - 1;
if (((e - s) < len) || memcmp (s, "/__overlay__/", len)) {
return -FDT_ERR_BADOVERLAY;
}
rel_path = s + len;
rel_path_len = e - rel_path;
/* find the fragment index in which the symbol lies */
ret = fdt_subnode_offset_namelen (
fdto,
0,
frag_name,
frag_name_len
);
/* not found? */
if (ret < 0) {
return -FDT_ERR_BADOVERLAY;
}
fragment = ret;
/* an __overlay__ subnode must exist */
ret = fdt_subnode_offset (fdto, fragment, "__overlay__");
if (ret < 0) {
return -FDT_ERR_BADOVERLAY;
}
/* get the target of the fragment */
ret = overlay_get_target (fdt, fdto, fragment, &target_path);
if (ret < 0) {
return ret;
}
target = ret;
/* if we have a target path use */
if (!target_path) {
ret = get_path_len (fdt, target);
if (ret < 0) {
return ret;
}
len = ret;
} else {
len = strlen (target_path);
}
ret = fdt_setprop_placeholder (
fdt,
root_sym,
name,
len + (len > 1) + rel_path_len + 1,
&p
);
if (ret < 0) {
return ret;
}
if (!target_path) {
/* again in case setprop_placeholder changed it */
ret = overlay_get_target (fdt, fdto, fragment, &target_path);
if (ret < 0) {
return ret;
}
target = ret;
}
buf = p;
if (len > 1) {
/* target is not root */
if (!target_path) {
ret = fdt_get_path (fdt, target, buf, len + 1);
if (ret < 0) {
return ret;
}
} else {
memcpy (buf, target_path, len + 1);
}
} else {
len--;
}
buf[len] = '/';
memcpy (buf + len + 1, rel_path, rel_path_len);
buf[len + 1 + rel_path_len] = '\0';
}
return 0;
}
int
fdt_overlay_apply (
void *fdt,
void *fdto
)
{
uint32_t delta = fdt_get_max_phandle (fdt);
int ret;
FDT_CHECK_HEADER (fdt);
FDT_CHECK_HEADER (fdto);
ret = overlay_adjust_local_phandles (fdto, delta);
if (ret) {
goto err;
}
ret = overlay_update_local_references (fdto, delta);
if (ret) {
goto err;
}
ret = overlay_fixup_phandles (fdt, fdto);
if (ret) {
goto err;
}
ret = overlay_merge (fdt, fdto);
if (ret) {
goto err;
}
ret = overlay_symbol_update (fdt, fdto);
if (ret) {
goto err;
}
/*
* The overlay has been damaged, erase its magic.
*/
fdt_set_magic (fdto, ~0);
return 0;
err:
/*
* The overlay might have been damaged, erase its magic.
*/
fdt_set_magic (fdto, ~0);
/*
* The base device tree might have been damaged, erase its
* magic.
*/
fdt_set_magic (fdt, ~0);
return ret;
}
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