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[Xen-devel] [PATCH v4 28/33] tools/libxl: Check if fdt_{first, next}_subnode are present in libfdt

The functions fdt_{fisrt,next}_subnode may not be available because: * It has been introduced in 2013 => Doesn't work on Wheezy * The prototype exists but the functions are not exposed. Don't ask why... The later has been fixed recently in the dtc repo [1] When the functions are not available, implement our own in order to use them in a following patch. [1] git://git.kernel.org/pub/scm/utils/dtc/dtc.git commit a4b093f7366fdb429ca1781144d3985fa50d0fbb Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> Cc: Wei Liu <wei.liu2@xxxxxxxxxx> --- Changes in v4: - Patch added --- tools/config.h.in | 6 ++++ tools/configure.ac | 5 +++ tools/libxl/Makefile | 2 +- tools/libxl/libxl_fdt.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 96 insertions(+), 1 deletion(-) create mode 100644 tools/libxl/libxl_fdt.c diff --git a/tools/config.h.in b/tools/config.h.in index 2a0ae48..06f8b6c 100644 --- a/tools/config.h.in +++ b/tools/config.h.in @@ -3,6 +3,12 @@ /* Blktap2 enabled */ #undef HAVE_BLKTAP2 +/* Define to 1 if you have the `fdt_first_subnode' function. */ +#undef HAVE_FDT_FIRST_SUBNODE + +/* Define to 1 if you have the `fdt_next_subnode' function. */ +#undef HAVE_FDT_NEXT_SUBNODE + /* Define to 1 if you have the <inttypes.h> header file. */ #undef HAVE_INTTYPES_H diff --git a/tools/configure.ac b/tools/configure.ac index d31c2f3..cc13336 100644 --- a/tools/configure.ac +++ b/tools/configure.ac @@ -355,6 +355,11 @@ AC_SUBST(libiconv) case "$host_cpu" in arm*|aarch64) AC_CHECK_LIB([fdt], [fdt_create], [], [AC_MSG_ERROR([Could not find libfdt])]) + +# The functions fdt_{first,next}_subnode may not be available because: +# * It has been introduced in 2013 => Doesn't work on Wheezy +# * The prototype exists but the functions are not exposed. Don't ask why... +AC_CHECK_FUNCS([fdt_first_subnode fdt_next_subnode]) esac # Checks for header files. diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile index 1b16598..d74aee1 100644 --- a/tools/libxl/Makefile +++ b/tools/libxl/Makefile @@ -59,7 +59,7 @@ endif LIBXL_OBJS-y += libxl_remus_device.o libxl_remus_disk_drbd.o LIBXL_OBJS-$(CONFIG_X86) += libxl_cpuid.o libxl_x86.o libxl_psr.o -LIBXL_OBJS-$(CONFIG_ARM) += libxl_nocpuid.o libxl_arm.o +LIBXL_OBJS-$(CONFIG_ARM) += libxl_nocpuid.o libxl_arm.o libxl_fdt.o ifeq ($(CONFIG_NetBSD),y) LIBXL_OBJS-y += libxl_netbsd.o diff --git a/tools/libxl/libxl_fdt.c b/tools/libxl/libxl_fdt.c new file mode 100644 index 0000000..f88e9f1 --- /dev/null +++ b/tools/libxl/libxl_fdt.c @@ -0,0 +1,84 @@ +/* + * libfdt - Flat Device Tree manipulation + * Copyright (C) 2006 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.h> + +#ifndef HAVE_FDT_FIRST_SUBNODE +int fdt_first_subnode(const void *fdt, int offset) +{ + int depth = 0; + + offset = fdt_next_node(fdt, offset, &depth); + if (offset < 0 || depth != 1) + return -FDT_ERR_NOTFOUND; + + return offset; +} +#endif + +#ifndef HAVE_FDT_NEXT_SUBNODE +int fdt_next_subnode(const void *fdt, int offset) +{ + int depth = 1; + + /* + * With respect to the parent, the depth of the next subnode will be + * the same as the last. + */ + do { + offset = fdt_next_node(fdt, offset, &depth); + if (offset < 0 || depth < 1) + return -FDT_ERR_NOTFOUND; + } while (depth > 1); + + return offset; +} +#endif -- 2.1.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel

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