From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from VA3EHSOBE003.bigfish.com (va3ehsobe003.messaging.microsoft.com [216.32.180.13]) by ozlabs.org (Postfix) with ESMTP id C1322B6ED0 for ; Thu, 15 Jul 2010 01:18:57 +1000 (EST) From: Matthew McClintock To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH V4] powerpc/prom: Export device tree physical address via proc Date: Wed, 14 Jul 2010 10:18:53 -0500 Message-ID: <1279120733-13584-1-git-send-email-msm@freescale.com> MIME-Version: 1.0 Content-Type: text/plain Cc: Matthew McClintock , Kumar Gala , Timur Tabi 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 --- V4: Fixed misspelling V3: Remove unneeded cast, and fixed indentation screw up V2: messed up changes arch/powerpc/kernel/prom.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 45 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index fd9359a..ff3e240 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 +912,47 @@ 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,devicetree-end", NULL); + if (prop) + prom_remove_property(node, prop); + + flat_dt_start = virt_to_phys(initial_boot_params); + flat_dt_end = 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