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

[Roy Franz <roy.franz@xxxxxxxxxx>]

On Tue, Jul 22, 2014 at 9:36 AM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> 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,

I can certainly do that - I was simply being conservative.

Should I prepare an patch independent of the EFI stub series to
just update the libfdt, or would you like it kept as part of the current
series?


Roy


>
>> 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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