1 files changed, 79 insertions, 12 deletions

diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index ac2a21f45c75..b3abebb7ee64 100644
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -13,13 +13,17 @@
 #include <linux/reboot.h>
 #include <linux/threads.h>
 #include <linux/lmb.h>
+#include <linux/of.h>
 #include <asm/machdep.h>
 #include <asm/prom.h>
+#include <asm/sections.h>
 
 void machine_crash_shutdown(struct pt_regs *regs)
 {
         if (ppc_md.machine_crash_shutdown)
                 ppc_md.machine_crash_shutdown(regs);
+        else
+                default_machine_crash_shutdown(regs);
 }
 
 /*
@@ -31,11 +35,8 @@ int machine_kexec_prepare(struct kimage *image)
 {
         if (ppc_md.machine_kexec_prepare)
                 return ppc_md.machine_kexec_prepare(image);
-        /*
-         * Fail if platform doesn't provide its own machine_kexec_prepare
-         * implementation.
-         */
-        return -ENOSYS;
+        else
+                return default_machine_kexec_prepare(image);
 }
 
 void machine_kexec_cleanup(struct kimage *image)
@@ -52,13 +53,11 @@ void machine_kexec(struct kimage *image)
 {
         if (ppc_md.machine_kexec)
                 ppc_md.machine_kexec(image);
-        else {
-                /*
-                 * Fall back to normal restart if platform doesn't provide
-                 * its own kexec function, and user insist to kexec...
-                 */
-                machine_restart(NULL);
-        }
+        else
+                default_machine_kexec(image);
+
+        /* Fall back to normal restart if we're still alive. */
+        machine_restart(NULL);
         for(;;);
 }
 
@@ -118,3 +117,71 @@ int overlaps_crashkernel(unsigned long start, unsigned long size)
 {
         return (start + size) > crashk_res.start && start <= crashk_res.end;
 }
+
+/* Values we need to export to the second kernel via the device tree. */
+static unsigned long kernel_end;
+static unsigned long crashk_size;
+
+static struct property kernel_end_prop = {
+        .name = "linux,kernel-end",
+        .length = sizeof(unsigned long),
+        .value = &kernel_end,
+};
+
+static struct property crashk_base_prop = {
+        .name = "linux,crashkernel-base",
+        .length = sizeof(unsigned long),
+        .value = &crashk_res.start,
+};
+
+static struct property crashk_size_prop = {
+        .name = "linux,crashkernel-size",
+        .length = sizeof(unsigned long),
+        .value = &crashk_size,
+};
+
+static void __init export_crashk_values(struct device_node *node)
+{
+        struct property *prop;
+
+        /* There might be existing crash kernel properties, but we can't
+         * be sure what's in them, so remove them. */
+        prop = of_find_property(node, "linux,crashkernel-base", NULL);
+        if (prop)
+                prom_remove_property(node, prop);
+
+        prop = of_find_property(node, "linux,crashkernel-size", NULL);
+        if (prop)
+                prom_remove_property(node, prop);
+
+        if (crashk_res.start != 0) {
+                prom_add_property(node, &crashk_base_prop);
+                crashk_size = crashk_res.end - crashk_res.start + 1;
+                prom_add_property(node, &crashk_size_prop);
+        }
+}
+
+static int __init kexec_setup(void)
+{
+        struct device_node *node;
+        struct property *prop;
+
+        node = of_find_node_by_path("/chosen");
+        if (!node)
+                return -ENOENT;
+
+        /* remove any stale properties so ours can be found */
+        prop = of_find_property(node, kernel_end_prop.name, NULL);
+        if (prop)
+                prom_remove_property(node, prop);
+
+        /* information needed by userspace when using default_machine_kexec */
+        kernel_end = __pa(_end);
+        prom_add_property(node, &kernel_end_prop);
+
+        export_crashk_values(node);
+
+        of_node_put(node);
+        return 0;
+}
+late_initcall(kexec_setup);