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authorDavid Gibson <david@gibson.dropbear.id.au>2009-04-30 15:25:53 +1000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-05-02 16:52:26 -0700
commit9fffb55f66127b52c937ede5196ebfa0c0d50bce (patch)
tree11664fb82734ba8dcde9556b8d47e780451a740a /scripts/dtc/srcpos.c
parentMerge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/configfs (diff)
downloadlinux-dev-9fffb55f66127b52c937ede5196ebfa0c0d50bce.tar.xz
linux-dev-9fffb55f66127b52c937ede5196ebfa0c0d50bce.zip
Move dtc and libfdt sources from arch/powerpc/boot to scripts/dtc
The powerpc kernel always requires an Open Firmware like device tree to supply device information. On systems without OF, this comes from a flattened device tree blob. This blob is usually generated by dtc, a tool which compiles a text description of the device tree into the flattened format used by the kernel. Sometimes, the bootwrapper makes small changes to the pre-compiled device tree blob (e.g. filling in the size of RAM). To do this it uses the libfdt library. Because these are only used on powerpc, the code for both these tools is included under arch/powerpc/boot (these were imported and are periodically updated from the upstream dtc tree). However, the microblaze architecture, currently being prepared for merging to mainline also uses dtc to produce device tree blobs. A few other archs have also mentioned some interest in using dtc. Therefore, this patch moves dtc and libfdt from arch/powerpc into scripts, where it can be used by any architecture. The vast bulk of this patch is a literal move, the rest is adjusting the various Makefiles to use dtc and libfdt correctly from their new locations. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/dtc/srcpos.c')
-rw-r--r--scripts/dtc/srcpos.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/scripts/dtc/srcpos.c b/scripts/dtc/srcpos.c
new file mode 100644
index 000000000000..9641b7628b4d
--- /dev/null
+++ b/scripts/dtc/srcpos.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
+ *
+ * This program 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 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+
+#include "dtc.h"
+#include "srcpos.h"
+
+/*
+ * Like yylineno, this is the current open file pos.
+ */
+
+struct dtc_file *srcpos_file;
+
+static int dtc_open_one(struct dtc_file *file,
+ const char *search,
+ const char *fname)
+{
+ char *fullname;
+
+ if (search) {
+ fullname = xmalloc(strlen(search) + strlen(fname) + 2);
+
+ strcpy(fullname, search);
+ strcat(fullname, "/");
+ strcat(fullname, fname);
+ } else {
+ fullname = strdup(fname);
+ }
+
+ file->file = fopen(fullname, "r");
+ if (!file->file) {
+ free(fullname);
+ return 0;
+ }
+
+ file->name = fullname;
+ return 1;
+}
+
+
+struct dtc_file *dtc_open_file(const char *fname,
+ const struct search_path *search)
+{
+ static const struct search_path default_search = { NULL, NULL, NULL };
+
+ struct dtc_file *file;
+ const char *slash;
+
+ file = xmalloc(sizeof(struct dtc_file));
+
+ slash = strrchr(fname, '/');
+ if (slash) {
+ char *dir = xmalloc(slash - fname + 1);
+
+ memcpy(dir, fname, slash - fname);
+ dir[slash - fname] = 0;
+ file->dir = dir;
+ } else {
+ file->dir = NULL;
+ }
+
+ if (streq(fname, "-")) {
+ file->name = "stdin";
+ file->file = stdin;
+ return file;
+ }
+
+ if (fname[0] == '/') {
+ file->file = fopen(fname, "r");
+ if (!file->file)
+ goto fail;
+
+ file->name = strdup(fname);
+ return file;
+ }
+
+ if (!search)
+ search = &default_search;
+
+ while (search) {
+ if (dtc_open_one(file, search->dir, fname))
+ return file;
+
+ if (errno != ENOENT)
+ goto fail;
+
+ search = search->next;
+ }
+
+fail:
+ die("Couldn't open \"%s\": %s\n", fname, strerror(errno));
+}
+
+void dtc_close_file(struct dtc_file *file)
+{
+ if (fclose(file->file))
+ die("Error closing \"%s\": %s\n", file->name, strerror(errno));
+
+ free(file->dir);
+ free(file);
+}