Re: [Xen-devel] [Linaro-uefi] [PATCH V2 11/12] Add fdt_create_empty_tree() function.

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Roy,

On 07/22/2014 01:43 AM, Roy Franz wrote:
> Add fdt_create_empty_tree() function from v1.4.0 of libfdt taken from
> git://git.jdl.com/software/dtc.git
> This function was not present in v1.3.0, but is a relatively simple
> helper function, and appears to work fine with the v1.3.0 that is
> currently present in XEN.

Shouldn't we update our internal libfdt to v1.4.0 rather than taking
only the new file?

Regards,

> Signed-off-by: Roy Franz <roy.franz@xxxxxxxxxx>
> ---
>  xen/common/libfdt/Makefile.libfdt  |  2 +-
>  xen/common/libfdt/fdt_empty_tree.c | 84 
> ++++++++++++++++++++++++++++++++++++++
>  xen/include/xen/libfdt/libfdt.h    |  1 +
>  3 files changed, 86 insertions(+), 1 deletion(-)
>  create mode 100644 xen/common/libfdt/fdt_empty_tree.c
> 
> diff --git a/xen/common/libfdt/Makefile.libfdt 
> b/xen/common/libfdt/Makefile.libfdt
> index d55a6f8..4366627 100644
> --- a/xen/common/libfdt/Makefile.libfdt
> +++ b/xen/common/libfdt/Makefile.libfdt
> @@ -6,5 +6,5 @@
>  LIBFDT_soname = libfdt.$(SHAREDLIB_EXT).1
>  LIBFDT_INCLUDES = fdt.h libfdt.h
>  LIBFDT_VERSION = version.lds
> -LIBFDT_SRCS = fdt.c fdt_ro.c fdt_wip.c fdt_sw.c fdt_rw.c fdt_strerror.c
> +LIBFDT_SRCS = fdt.c fdt_ro.c fdt_wip.c fdt_sw.c fdt_rw.c fdt_strerror.c 
> fdt_empty_tree.c
>  LIBFDT_OBJS = $(LIBFDT_SRCS:%.c=%.o)
> diff --git a/xen/common/libfdt/fdt_empty_tree.c 
> b/xen/common/libfdt/fdt_empty_tree.c
> new file mode 100644
> index 0000000..f72d13b
> --- /dev/null
> +++ b/xen/common/libfdt/fdt_empty_tree.c
> @@ -0,0 +1,84 @@
> +/*
> + * libfdt - Flat Device Tree manipulation
> + * Copyright (C) 2012 David Gibson, IBM Corporation.
> + *
> + * 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"
> +
> +int fdt_create_empty_tree(void *buf, int bufsize)
> +{
> +     int err;
> +
> +     err = fdt_create(buf, bufsize);
> +     if (err)
> +             return err;
> +
> +     err = fdt_finish_reservemap(buf);
> +     if (err)
> +             return err;
> +
> +     err = fdt_begin_node(buf, "");
> +     if (err)
> +             return err;
> +
> +     err =  fdt_end_node(buf);
> +     if (err)
> +             return err;
> +
> +     err = fdt_finish(buf);
> +     if (err)
> +             return err;
> +
> +     return fdt_open_into(buf, buf, bufsize);
> +}
> +
> diff --git a/xen/include/xen/libfdt/libfdt.h b/xen/include/xen/libfdt/libfdt.h
> index 6086047..f4539fc 100644
> --- a/xen/include/xen/libfdt/libfdt.h
> +++ b/xen/include/xen/libfdt/libfdt.h
> @@ -959,6 +959,7 @@ int fdt_finish(void *fdt);
>  /* Read-write functions                                               */
>  /**********************************************************************/
>  
> +int fdt_create_empty_tree(void *buf, int bufsize);
>  int fdt_open_into(const void *fdt, void *buf, int bufsize);
>  int fdt_pack(void *fdt);
>  
> 


-- 
Julien Grall

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