e7108d0e96
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737 Apply uncrustify changes to .c/.h files in the EmbeddedPkg package Cc: Andrew Fish <afish@apple.com> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Reviewed-by: Andrew Fish <afish@apple.com>
1128 lines
28 KiB
C
1128 lines
28 KiB
C
/*
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* libfdt - Flat Device Tree manipulation
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* Copyright (C) 2016 Free Electrons
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* Copyright (C) 2016 NextThing Co.
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*
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* libfdt is dual licensed: you can use it either under the terms of
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* the GPL, or the BSD license, at your option.
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*
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* a) This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*
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* Alternatively,
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*
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* b) Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libfdt_env.h"
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#include <fdt.h>
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#include <libfdt.h>
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#include "libfdt_internal.h"
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/**
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* overlay_get_target_phandle - retrieves the target phandle of a fragment
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* @fdto: pointer to the device tree overlay blob
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* @fragment: node offset of the fragment in the overlay
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*
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* overlay_get_target_phandle() retrieves the target phandle of an
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* overlay fragment when that fragment uses a phandle (target
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* property) instead of a path (target-path property).
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*
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* returns:
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* the phandle pointed by the target property
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* 0, if the phandle was not found
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* -1, if the phandle was malformed
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*/
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static uint32_t
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overlay_get_target_phandle (
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const void *fdto,
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int fragment
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)
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{
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const fdt32_t *val;
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int len;
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val = fdt_getprop (fdto, fragment, "target", &len);
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if (!val) {
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return 0;
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}
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if ((len != sizeof (*val)) || (fdt32_to_cpu (*val) == (uint32_t)-1)) {
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return (uint32_t)-1;
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}
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return fdt32_to_cpu (*val);
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}
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/**
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* overlay_get_target - retrieves the offset of a fragment's target
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* @fdt: Base device tree blob
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* @fdto: Device tree overlay blob
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* @fragment: node offset of the fragment in the overlay
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* @pathp: pointer which receives the path of the target (or NULL)
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*
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* overlay_get_target() retrieves the target offset in the base
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* device tree of a fragment, no matter how the actual targetting is
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* done (through a phandle or a path)
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*
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* returns:
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* the targetted node offset in the base device tree
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* Negative error code on error
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*/
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static int
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overlay_get_target (
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const void *fdt,
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const void *fdto,
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int fragment,
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char const **pathp
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)
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{
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uint32_t phandle;
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const char *path = NULL;
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int path_len = 0, ret;
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/* Try first to do a phandle based lookup */
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phandle = overlay_get_target_phandle (fdto, fragment);
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if (phandle == (uint32_t)-1) {
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return -FDT_ERR_BADPHANDLE;
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}
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/* no phandle, try path */
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if (!phandle) {
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/* And then a path based lookup */
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path = fdt_getprop (fdto, fragment, "target-path", &path_len);
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if (path) {
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ret = fdt_path_offset (fdt, path);
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} else {
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ret = path_len;
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}
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} else {
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ret = fdt_node_offset_by_phandle (fdt, phandle);
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}
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/*
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* If we haven't found either a target or a
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* target-path property in a node that contains a
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* __overlay__ subnode (we wouldn't be called
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* otherwise), consider it a improperly written
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* overlay
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*/
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if ((ret < 0) && (path_len == -FDT_ERR_NOTFOUND)) {
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ret = -FDT_ERR_BADOVERLAY;
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}
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/* return on error */
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if (ret < 0) {
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return ret;
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}
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/* return pointer to path (if available) */
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if (pathp) {
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*pathp = path ? path : NULL;
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}
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return ret;
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}
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/**
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* overlay_phandle_add_offset - Increases a phandle by an offset
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* @fdt: Base device tree blob
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* @node: Device tree overlay blob
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* @name: Name of the property to modify (phandle or linux,phandle)
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* @delta: offset to apply
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*
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* overlay_phandle_add_offset() increments a node phandle by a given
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* offset.
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*
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* returns:
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* 0 on success.
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* Negative error code on error
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*/
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static int
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overlay_phandle_add_offset (
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void *fdt,
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int node,
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const char *name,
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uint32_t delta
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)
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{
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const fdt32_t *val;
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uint32_t adj_val;
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int len;
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val = fdt_getprop (fdt, node, name, &len);
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if (!val) {
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return len;
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}
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if (len != sizeof (*val)) {
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return -FDT_ERR_BADPHANDLE;
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}
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adj_val = fdt32_to_cpu (*val);
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if ((adj_val + delta) < adj_val) {
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return -FDT_ERR_NOPHANDLES;
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}
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adj_val += delta;
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if (adj_val == (uint32_t)-1) {
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return -FDT_ERR_NOPHANDLES;
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}
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return fdt_setprop_inplace_u32 (fdt, node, name, adj_val);
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}
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/**
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* overlay_adjust_node_phandles - Offsets the phandles of a node
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* @fdto: Device tree overlay blob
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* @node: Offset of the node we want to adjust
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* @delta: Offset to shift the phandles of
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*
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* overlay_adjust_node_phandles() adds a constant to all the phandles
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* of a given node. This is mainly use as part of the overlay
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* application process, when we want to update all the overlay
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* phandles to not conflict with the overlays of the base device tree.
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*
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* returns:
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* 0 on success
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* Negative error code on failure
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*/
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static int
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overlay_adjust_node_phandles (
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void *fdto,
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int node,
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uint32_t delta
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)
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{
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int child;
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int ret;
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ret = overlay_phandle_add_offset (fdto, node, "phandle", delta);
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if (ret && (ret != -FDT_ERR_NOTFOUND)) {
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return ret;
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}
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ret = overlay_phandle_add_offset (fdto, node, "linux,phandle", delta);
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if (ret && (ret != -FDT_ERR_NOTFOUND)) {
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return ret;
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}
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fdt_for_each_subnode (child, fdto, node) {
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ret = overlay_adjust_node_phandles (fdto, child, delta);
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if (ret) {
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return ret;
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}
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}
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return 0;
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}
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/**
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* overlay_adjust_local_phandles - Adjust the phandles of a whole overlay
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* @fdto: Device tree overlay blob
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* @delta: Offset to shift the phandles of
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*
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* overlay_adjust_local_phandles() adds a constant to all the
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* phandles of an overlay. This is mainly use as part of the overlay
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* application process, when we want to update all the overlay
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* phandles to not conflict with the overlays of the base device tree.
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*
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* returns:
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* 0 on success
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* Negative error code on failure
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*/
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static int
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overlay_adjust_local_phandles (
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void *fdto,
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uint32_t delta
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)
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{
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/*
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* Start adjusting the phandles from the overlay root
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*/
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return overlay_adjust_node_phandles (fdto, 0, delta);
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}
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/**
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* overlay_update_local_node_references - Adjust the overlay references
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* @fdto: Device tree overlay blob
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* @tree_node: Node offset of the node to operate on
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* @fixup_node: Node offset of the matching local fixups node
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* @delta: Offset to shift the phandles of
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*
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* overlay_update_local_nodes_references() update the phandles
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* pointing to a node within the device tree overlay by adding a
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* constant delta.
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*
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* This is mainly used as part of a device tree application process,
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* where you want the device tree overlays phandles to not conflict
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* with the ones from the base device tree before merging them.
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*
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* returns:
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* 0 on success
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* Negative error code on failure
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*/
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static int
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overlay_update_local_node_references (
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void *fdto,
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int tree_node,
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int fixup_node,
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uint32_t delta
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)
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{
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int fixup_prop;
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int fixup_child;
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int ret;
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fdt_for_each_property_offset (fixup_prop, fdto, fixup_node) {
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const fdt32_t *fixup_val;
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const char *tree_val;
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const char *name;
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int fixup_len;
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int tree_len;
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int i;
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fixup_val = fdt_getprop_by_offset (
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fdto,
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fixup_prop,
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&name,
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&fixup_len
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);
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if (!fixup_val) {
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return fixup_len;
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}
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if (fixup_len % sizeof (uint32_t)) {
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return -FDT_ERR_BADOVERLAY;
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}
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tree_val = fdt_getprop (fdto, tree_node, name, &tree_len);
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if (!tree_val) {
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if (tree_len == -FDT_ERR_NOTFOUND) {
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return -FDT_ERR_BADOVERLAY;
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}
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return tree_len;
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}
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for (i = 0; i < (fixup_len / sizeof (uint32_t)); i++) {
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fdt32_t adj_val;
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uint32_t poffset;
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poffset = fdt32_to_cpu (fixup_val[i]);
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/*
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* phandles to fixup can be unaligned.
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*
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* Use a memcpy for the architectures that do
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* not support unaligned accesses.
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*/
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memcpy (&adj_val, tree_val + poffset, sizeof (adj_val));
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adj_val = cpu_to_fdt32 (fdt32_to_cpu (adj_val) + delta);
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ret = fdt_setprop_inplace_namelen_partial (
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fdto,
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tree_node,
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name,
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strlen (name),
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poffset,
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&adj_val,
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sizeof (adj_val)
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);
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if (ret == -FDT_ERR_NOSPACE) {
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return -FDT_ERR_BADOVERLAY;
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}
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if (ret) {
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return ret;
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}
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}
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}
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fdt_for_each_subnode (fixup_child, fdto, fixup_node) {
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const char *fixup_child_name = fdt_get_name (
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fdto,
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fixup_child,
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NULL
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);
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int tree_child;
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tree_child = fdt_subnode_offset (
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fdto,
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tree_node,
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fixup_child_name
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);
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if (tree_child == -FDT_ERR_NOTFOUND) {
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return -FDT_ERR_BADOVERLAY;
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}
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if (tree_child < 0) {
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return tree_child;
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}
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ret = overlay_update_local_node_references (
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fdto,
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tree_child,
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fixup_child,
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delta
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);
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if (ret) {
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return ret;
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}
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}
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return 0;
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}
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/**
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* overlay_update_local_references - Adjust the overlay references
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* @fdto: Device tree overlay blob
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* @delta: Offset to shift the phandles of
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*
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* overlay_update_local_references() update all the phandles pointing
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* to a node within the device tree overlay by adding a constant
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* delta to not conflict with the base overlay.
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|
*
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* 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.
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*
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* returns:
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* 0 on success
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* Negative error code on failure
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*/
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static int
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overlay_update_local_references (
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void *fdto,
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uint32_t delta
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)
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{
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int fixups;
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fixups = fdt_path_offset (fdto, "/__local_fixups__");
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if (fixups < 0) {
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/* There's no local phandles to adjust, bail out */
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if (fixups == -FDT_ERR_NOTFOUND) {
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return 0;
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}
|
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return fixups;
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}
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|
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/*
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* Update our local references from the root of the tree
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*/
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return overlay_update_local_node_references (
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fdto,
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0,
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fixups,
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delta
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);
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}
|
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|
/**
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* overlay_fixup_one_phandle - Set an overlay phandle to the base one
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* @fdt: Base Device Tree blob
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* @fdto: Device tree overlay blob
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* @symbols_off: Node offset of the symbols node in the base device tree
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* @path: Path to a node holding a phandle in the overlay
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* @path_len: number of path characters to consider
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* @name: Name of the property holding the phandle reference in the overlay
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* @name_len: number of name characters to consider
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* @poffset: Offset within the overlay property where the phandle is stored
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* @label: Label of the node referenced by the phandle
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*
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* overlay_fixup_one_phandle() resolves an overlay phandle pointing to
|
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* a node in the base device tree.
|
|
*
|
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* This is part of the device tree overlay application process, when
|
|
* you want all the phandles in the overlay to point to the actual
|
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* base dt nodes.
|
|
*
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|
* returns:
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* 0 on success
|
|
* Negative error code on failure
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|
*/
|
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static int
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overlay_fixup_one_phandle (
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void *fdt,
|
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void *fdto,
|
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int symbols_off,
|
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const char *path,
|
|
uint32_t path_len,
|
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const char *name,
|
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uint32_t name_len,
|
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int poffset,
|
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const char *label
|
|
)
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|
{
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const char *symbol_path;
|
|
uint32_t phandle;
|
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fdt32_t phandle_prop;
|
|
int symbol_off, fixup_off;
|
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int prop_len;
|
|
|
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if (symbols_off < 0) {
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return symbols_off;
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}
|
|
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symbol_path = fdt_getprop (
|
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fdt,
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symbols_off,
|
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label,
|
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&prop_len
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);
|
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if (!symbol_path) {
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return prop_len;
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}
|
|
|
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symbol_off = fdt_path_offset (fdt, symbol_path);
|
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if (symbol_off < 0) {
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return symbol_off;
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}
|
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|
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phandle = fdt_get_phandle (fdt, symbol_off);
|
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if (!phandle) {
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return -FDT_ERR_NOTFOUND;
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}
|
|
|
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fixup_off = fdt_path_offset_namelen (fdto, path, path_len);
|
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if (fixup_off == -FDT_ERR_NOTFOUND) {
|
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return -FDT_ERR_BADOVERLAY;
|
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}
|
|
|
|
if (fixup_off < 0) {
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return fixup_off;
|
|
}
|
|
|
|
phandle_prop = cpu_to_fdt32 (phandle);
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|
return fdt_setprop_inplace_namelen_partial (
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fdto,
|
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fixup_off,
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name,
|
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name_len,
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poffset,
|
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&phandle_prop,
|
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sizeof (phandle_prop)
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);
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|
}
|
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|
|
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;
|
|
}
|