From 1a7334a87431ec1e20d4082a36043342713fd941 Mon Sep 17 00:00:00 2001
From: John Crispin <john@openwrt.org>
Date: Fri, 2 Nov 2012 20:06:45 +0000
Subject: [PATCH] rename patch-cmdline and add code for patching DTB files into
 kernel images

SVN-Revision: 34058
---
 tools/Makefile                                |   2 +-
 tools/{patch-cmdline => patch-image}/Makefile |   7 +-
 .../src/patch-cmdline.c                       |   0
 tools/patch-image/src/patch-dtb.c             | 101 ++++++++++++++++++
 4 files changed, 107 insertions(+), 3 deletions(-)
 rename tools/{patch-cmdline => patch-image}/Makefile (62%)
 rename tools/{patch-cmdline => patch-image}/src/patch-cmdline.c (100%)
 create mode 100644 tools/patch-image/src/patch-dtb.c

diff --git a/tools/Makefile b/tools/Makefile
index b3ba6d06b1..9a0e148234 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -15,7 +15,7 @@ tools-y += gmp mpfr mpc libelf
 endif
 tools-y += m4 libtool autoconf automake flex bison pkg-config sed mklibs
 tools-y += sstrip ipkg-utils genext2fs e2fsprogs mtd-utils mkimage
-tools-y += firmware-utils patch-cmdline quilt yaffs2 flock padjffs2
+tools-y += firmware-utils patch-image quilt yaffs2 flock padjffs2
 tools-y += mm-macros xorg-macros xfce-macros missing-macros xz cmake scons
 tools-$(CONFIG_TARGET_orion_generic) += wrt350nv2-builder upslug2
 tools-$(CONFIG_powerpc) += upx
diff --git a/tools/patch-cmdline/Makefile b/tools/patch-image/Makefile
similarity index 62%
rename from tools/patch-cmdline/Makefile
rename to tools/patch-image/Makefile
index a9526397f1..cd2df5c8af 100644
--- a/tools/patch-cmdline/Makefile
+++ b/tools/patch-image/Makefile
@@ -6,20 +6,23 @@
 #
 include $(TOPDIR)/rules.mk
 
-PKG_NAME:=patch-cmdline
+PKG_NAME:=patch-image
 
 include $(INCLUDE_DIR)/host-build.mk
 
 define Host/Compile
-	$(HOSTCC) $(HOST_CFLAGS) -include endian.h $(HOST_STATIC_LINKING) -o $(HOST_BUILD_DIR)/$(PKG_NAME) src/$(PKG_NAME).c
+	$(HOSTCC) $(HOST_CFLAGS) -include endian.h $(HOST_STATIC_LINKING) -o $(HOST_BUILD_DIR)/patch-cmdline src/patch-cmdline.c
+	$(HOSTCC) $(HOST_CFLAGS) -include endian.h $(HOST_STATIC_LINKING) -o $(HOST_BUILD_DIR)/patch-dtb src/patch-dtb.c
 endef
 
 define Host/Install
 	$(CP) $(HOST_BUILD_DIR)/patch-cmdline $(STAGING_DIR_HOST)/bin/
+	$(CP) $(HOST_BUILD_DIR)/patch-dtb $(STAGING_DIR_HOST)/bin/
 endef
 
 define Host/Clean
 	rm -f $(STAGING_DIR_HOST)/bin/patch-cmdline
+	rm -f $(STAGING_DIR_HOST)/bin/patch-dtb
 endef
 
 $(eval $(call HostBuild))
diff --git a/tools/patch-cmdline/src/patch-cmdline.c b/tools/patch-image/src/patch-cmdline.c
similarity index 100%
rename from tools/patch-cmdline/src/patch-cmdline.c
rename to tools/patch-image/src/patch-cmdline.c
diff --git a/tools/patch-image/src/patch-dtb.c b/tools/patch-image/src/patch-dtb.c
new file mode 100644
index 0000000000..161e1dca2d
--- /dev/null
+++ b/tools/patch-image/src/patch-dtb.c
@@ -0,0 +1,101 @@
+/*
+ * patch-dtb.c - patch a dtb into an image
+ *
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
+ *
+ * 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.
+ *
+ * based on patch-cmdline.c
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <string.h>
+
+#define SEARCH_SPACE	(16 * 1024)
+#define DTB_MAX	(16 * 1024)
+
+int main(int argc, char **argv)
+{
+	int fd, fddtb, found = 0, len, ret = -1;
+	char *ptr, *ptrdtb, *p;
+	struct stat s;
+
+	if (argc != 3) {
+		fprintf(stderr, "Usage: %s <file> <dtb>\n", argv[0]);
+		goto err1;
+	}
+	fddtb = open(argv[1], O_RDONLY);
+	if (!fddtb)
+		goto err1;
+
+	if (stat(argv[2], &s)) {
+		fprintf(stderr, "DTB not found\n");
+		goto err1;
+	}
+
+	len = s.st_size;
+	if (len + 8 > DTB_MAX) {
+		fprintf(stderr, "DTB too big\n");
+		goto err1;
+	}
+
+        if (((fddtb = open(argv[2], O_RDONLY)) < 0) ||
+		(ptrdtb = (char *) mmap(0, DTB_MAX, PROT_READ, MAP_SHARED, fddtb, 0)) == (void *) (-1)) {
+		fprintf(stderr, "Could not open DTB");
+		goto err2;
+	}
+
+	if (((fd = open(argv[1], O_RDWR)) < 0) ||
+		(ptr = (char *) mmap(0, SEARCH_SPACE + DTB_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) {
+		fprintf(stderr, "Could not open kernel image");
+		goto err3;
+	}
+
+	for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) {
+		if (memcmp(p, "OWRTDTB:", 8) == 0) {
+			found = 1;
+			p += 8;
+			break;
+		}
+	}
+	if (!found) {
+		fprintf(stderr, "DTB marker not found!\n");
+		goto err4;
+	}
+
+	memset(p, 0, DTB_MAX - 8);
+	memcpy(p, ptrdtb, len);
+	msync(p, len, MS_SYNC|MS_INVALIDATE);
+	ret = 0;
+
+err4:
+	munmap((void *) ptr, len);
+err3:
+	if (fd > 0)
+		close(fd);
+	munmap((void *) ptrdtb, len);
+err2:
+	if (fddtb > 0)
+		close(fddtb);
+err1:
+	return ret;
+}