xref: /gem5/ext/libfdt/fdt_wip.c

/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2006 David Gibson, IBM Corporation.
 *
 *     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 <fdt.h>
#include <libfdt.h>

#include "libfdt_env.h"
#include "libfdt_internal.h"

int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
                        const void *val, int len)
{
        void *propval;
        int proplen;

        propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen);
        if (! propval)
                return proplen;

        if (proplen != len)
                return -FDT_ERR_NOSPACE;

        memcpy(propval, val, len);
        return 0;
}

static void _fdt_nop_region(void *start, int len)
{
        fdt32_t *p;

        for (p = start; (char *)p < ((char *)start + len); p++)
                *p = cpu_to_fdt32(FDT_NOP);
}

int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
{
        struct fdt_property *prop;
        int len;

        prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
        if (! prop)
                return len;

        _fdt_nop_region(prop, len + sizeof(*prop));

        return 0;
}

int _fdt_node_end_offset(void *fdt, int offset)
{
        int depth = 0;

        while ((offset >= 0) && (depth >= 0))
                offset = fdt_next_node(fdt, offset, &depth);

        return offset;
}

int fdt_nop_node(void *fdt, int nodeoffset)
{
        int endoffset;

        endoffset = _fdt_node_end_offset(fdt, nodeoffset);
        if (endoffset < 0)
                return endoffset;

        _fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
                        endoffset - nodeoffset);
        return 0;
}