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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v7 1/6] tools/libxl: Check if fdt_{first, next}_subnode are present in libfdt
From: Julien Grall <julien.grall@xxxxxxxxxx>
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>
Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
tools/configure needs to be regenerate as this patch is modifying
tools/configure.ac
Changes in v7:
- Drop Ian's ack as he request some changes due to build issue
- Check if the declaration are present if not add declaration
- Remove changes config.h.in as it will be regenerate before
committed
Changes in v6:
- Add Ian's Ack
Changes in v5:
- Add Ian's Signed-off-by for the license part and update the
license
- Rename libxl_fdt to libxl_libfdt_compat.c
Changes in v4:
- Patch added
---
tools/configure.ac | 6 +++
tools/libxl/Makefile | 2 +-
tools/libxl/libxl_internal.h | 1 +
tools/libxl/libxl_libfdt_compat.c | 94 +++++++++++++++++++++++++++++++++++++++
4 files changed, 102 insertions(+), 1 deletion(-)
create mode 100644 tools/libxl/libxl_libfdt_compat.c
diff --git a/tools/configure.ac b/tools/configure.ac
index d31c2f3..5b48ab2 100644
--- a/tools/configure.ac
+++ b/tools/configure.ac
@@ -355,6 +355,12 @@ AC_SUBST(libiconv)
case "$host_cpu" in
arm*|aarch64)
AC_CHECK_LIB([fdt], [fdt_create], [], [AC_MSG_ERROR([Could not find libfdt])])
+
+# The functions fdt_{first,next}_subnode may not be available because:
+# * It has been introduced in 2013 => Doesn't work on Wheezy
+# * The prototype exists but the functions are not exposed. Don't ask why...
+AC_CHECK_FUNCS([fdt_first_subnode fdt_next_subnode])
+AC_CHECK_DECLS([fdt_first_subnode, fdt_next_subnode],,,[#include <libfdt.h>])
esac
# Checks for header files.
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index 1b16598..2afb146 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -59,7 +59,7 @@ endif
LIBXL_OBJS-y += libxl_remus_device.o libxl_remus_disk_drbd.o
LIBXL_OBJS-$(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_libfdt_compat.o
ifeq ($(CONFIG_NetBSD),y)
LIBXL_OBJS-y += libxl_netbsd.o
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 8eb38aa..857abd4 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -3692,6 +3692,7 @@ static inline void libxl__update_config_vtpm(libxl__gc
*gc,
*/
void libxl__bitmap_copy_best_effort(libxl__gc *gc, libxl_bitmap *dptr,
const libxl_bitmap *sptr);
+
#endif
/*
diff --git a/tools/libxl/libxl_libfdt_compat.c
b/tools/libxl/libxl_libfdt_compat.c
new file mode 100644
index 0000000..a1823b2
--- /dev/null
+++ b/tools/libxl/libxl_libfdt_compat.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ * This file is part of libxl, and was originally taken from libfdt.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program 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 Lesser General Public License for more details.
+ *
+ * Additionally, this particular file is dual licensed. That is,
+ * alternatively, at your option:
+ *
+ * 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.
+ *
+ * Note that this applies only to this file, and other files with a
+ * similar notice. Also, note that when the same code is distributed
+ * along with the rest of libxl, you must comply with the terms of the
+ * LGPLv2.1 for the whole of libxl including this file.
+ *
+ * The intent is to permit, in particular, upstream libfdt to
+ * incorporate improvements to this file within upstream libfdt. At
+ * the time of writing, upstream libfdt is dual licensed: 2-clause BSD
+ * (as above) and GPLv2-or-later. The 2-clause BSD licence is
+ * compatible with both GPLv2-or-later and LGPLv2.1-only; this permits
+ * copying in both directions, and the optional licence upgrade to a
+ * copyleft licence by libdft upstream or the Xen Project,
+ * respectively.
+ */
+
+#include <libfdt.h>
+
+#include "libxl_libfdt_compat.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
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