From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:55519) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sh3tk-0001R6-Q1 for qemu-devel@nongnu.org; Tue, 19 Jun 2012 15:15:34 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Sh3ti-0004bN-EO for qemu-devel@nongnu.org; Tue, 19 Jun 2012 15:15:32 -0400 From: Alexander Graf Date: Tue, 19 Jun 2012 21:14:59 +0200 Message-Id: <1340133324-352-7-git-send-email-agraf@suse.de> In-Reply-To: <1340133324-352-1-git-send-email-agraf@suse.de> References: <1340133324-352-1-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 qemu-devel 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 Reviewed-by: Peter Crosthwaite --- 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 2f127b7..d037896 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 36fc9db..5f76f40 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