From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from VA3EHSOBE005.bigfish.com (va3ehsobe005.messaging.microsoft.com [216.32.180.31]) by ozlabs.org (Postfix) with ESMTP id C2B1BB6F16 for ; Wed, 14 Jul 2010 05:06:27 +1000 (EST) Received: from mail85-va3 (localhost.localdomain [127.0.0.1]) by mail85-va3-R.bigfish.com (Postfix) with ESMTP id CEF2193861F for ; Tue, 13 Jul 2010 18:50:36 +0000 (UTC) Received: from VA3EHSMHS005.bigfish.com (unknown [10.7.14.238]) by mail85-va3.bigfish.com (Postfix) with ESMTP id 176642D0124 for ; Tue, 13 Jul 2010 18:50:02 +0000 (UTC) Received: from az33smr01.freescale.net (az33smr01.freescale.net [10.64.34.199]) by az33egw02.freescale.net (8.14.3/8.14.3) with ESMTP id o6DIo0PJ011419 for ; Tue, 13 Jul 2010 11:50:00 -0700 (MST) From: Matthew McClintock To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH] powerpc:prom Export device tree physical address via proc Date: Tue, 13 Jul 2010 13:50:11 -0500 Message-ID: <1279047011-28989-1-git-send-email-msm@freescale.com> MIME-Version: 1.0 Content-Type: text/plain Cc: Matthew McClintock , Kumar Gala List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To build a proper flat device tree for kexec we need to know which memreserve region was used for the device tree for the currently running kernel, so we can remove it and replace it with the new memreserve for the kexec'ed kernel Signed-off-by: Matthew McClintock --- arch/powerpc/kernel/prom.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 44 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index fd9359a..6a8400e 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include @@ -911,3 +912,46 @@ static int __init export_flat_device_tree(void) } __initcall(export_flat_device_tree); #endif + +#ifdef CONFIG_KEXEC +static phys_addr_t flat_dt_start; +static phys_addr_t flat_dt_end; + +static struct property flat_dt_start_prop = { + .name = "linux,devicetree-start", + .length = sizeof(phys_addr_t), + .value = &flat_dt_start, +}; + +static struct property flat_dt_end_prop = { + .name = "linux,devicetree-end", + .length = sizeof(phys_addr_t), + .value = &flat_dt_end, +}; + +static int __init export_flat_device_tree_phys_addr(void) +{ + struct property *prop; + struct device_node *node; + + node = of_find_node_by_path("/chosen"); + if (!node) + return -ENOENT; + + prop = of_find_property(node, "linux,devicetree-start", NULL); + if (prop) + prom_remove_property(node, prop); + prop = of_find_property(node, "linux,devietree-end", NULL); + if (prop) + prom_remove_property(node, prop); + + flat_dt_start = (unsigned long)virt_to_phys(initial_boot_params); + flat_dt_end = (unsigned long)virt_to_phys(initial_boot_params) + + initial_boot_params->totalsize; + prom_add_property(node, &flat_dt_start_prop); + prom_add_property(node, &flat_dt_end_prop); + + return 0; +} +__initcall(export_flat_device_tree_phys_addr); +#endif -- 1.6.6.1