From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:53296) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sc3dP-0004jM-Ec for qemu-devel@nongnu.org; Tue, 05 Jun 2012 19:59:05 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Sc3Z5-0002QU-64 for qemu-devel@nongnu.org; Tue, 05 Jun 2012 19:57:59 -0400 From: Alexander Graf Date: Wed, 6 Jun 2012 01:52:57 +0200 Message-Id: <1338940402-28502-7-git-send-email-agraf@suse.de> In-Reply-To: <1338940402-28502-1-git-send-email-agraf@suse.de> References: <1338940402-28502-1-git-send-email-agraf@suse.de> Subject: [Qemu-devel] [PATCH 06/31] dt: add helper for empty dt creation List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "qemu-devel@nongnu.org Developers" Cc: qemu-ppc Mailing List We want to get rid of the concept of loading an external device tree and instead generate our own. However, to do this we need to also create a device tree template programatically. This patch adds a helper to create an empty device tree in memory. Signed-off-by: Alexander Graf --- device_tree.c | 37 +++++++++++++++++++++++++++++++++++++ device_tree.h | 1 + 2 files changed, 38 insertions(+), 0 deletions(-) diff --git a/device_tree.c b/device_tree.c index 6745d17..d4f1f0a 100644 --- a/device_tree.c +++ b/device_tree.c @@ -25,6 +25,43 @@ #include +#define FDT_MAX_SIZE 0x10000 + +void *create_device_tree(int *sizep) +{ + void *fdt; + int ret; + + *sizep = FDT_MAX_SIZE; + fdt = g_malloc0(FDT_MAX_SIZE); + ret = fdt_create(fdt, FDT_MAX_SIZE); + if (ret < 0) { + goto fail; + } + ret = fdt_begin_node(fdt, ""); + if (ret < 0) { + goto fail; + } + ret = fdt_end_node(fdt); + if (ret < 0) { + goto fail; + } + ret = fdt_finish(fdt); + if (ret < 0) { + goto fail; + } + ret = fdt_open_into(fdt, fdt, *sizep); + if (ret) { + fprintf(stderr, "Unable to copy device tree in memory\n"); + exit(1); + } + + return fdt; +fail: + fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret)); + exit(1); +} + void *load_device_tree(const char *filename_path, int *sizep) { int dt_size; diff --git a/device_tree.h b/device_tree.h index 376287a..5464dc7 100644 --- a/device_tree.h +++ b/device_tree.h @@ -14,6 +14,7 @@ #ifndef __DEVICE_TREE_H__ #define __DEVICE_TREE_H__ +void *create_device_tree(int *sizep); void *load_device_tree(const char *filename_path, int *sizep); int qemu_devtree_setprop(void *fdt, const char *node_path, -- 1.6.0.2