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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>
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/*
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* (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005.
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#include "dtc.h"
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#include <dirent.h>
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#include <sys/stat.h>
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static struct node *read_fstree(const char *dirname)
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{
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DIR *d;
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struct dirent *de;
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struct stat st;
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struct node *tree;
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d = opendir(dirname);
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if (!d)
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die("Couldn't opendir() \"%s\": %s\n", dirname, strerror(errno));
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tree = build_node(NULL, NULL);
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while ((de = readdir(d)) != NULL) {
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char *tmpnam;
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if (streq(de->d_name, ".")
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|| streq(de->d_name, ".."))
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continue;
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tmpnam = join_path(dirname, de->d_name);
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if (lstat(tmpnam, &st) < 0)
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die("stat(%s): %s\n", tmpnam, strerror(errno));
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if (S_ISREG(st.st_mode)) {
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struct property *prop;
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FILE *pfile;
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pfile = fopen(tmpnam, "r");
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if (! pfile) {
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fprintf(stderr,
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"WARNING: Cannot open %s: %s\n",
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tmpnam, strerror(errno));
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} else {
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prop = build_property(strdup(de->d_name),
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data_copy_file(pfile,
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st.st_size),
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NULL);
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add_property(tree, prop);
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fclose(pfile);
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}
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} else if (S_ISDIR(st.st_mode)) {
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struct node *newchild;
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newchild = read_fstree(tmpnam);
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newchild = name_node(newchild, strdup(de->d_name),
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NULL);
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add_child(tree, newchild);
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}
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free(tmpnam);
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}
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return tree;
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}
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struct boot_info *dt_from_fs(const char *dirname)
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{
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struct node *tree;
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tree = read_fstree(dirname);
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tree = name_node(tree, "", NULL);
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return build_boot_info(NULL, tree, 0);
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}
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