2 files changed, 60 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index 997243a91be8..69590fbf83da 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -10,6 +10,8 @@ obj-$(CONFIG_XICS)	+= xics.o
 obj-$(CONFIG_SCANLOG)   += scanlog.o
 obj-$(CONFIG_EEH)       += eeh.o eeh_cache.o eeh_driver.o eeh_event.o
 
+obj-$(CONFIG_HOTPLUG_CPU)       += hotplug-cpu.o
+
 obj-$(CONFIG_HVC_CONSOLE)       += hvconsole.o
 obj-$(CONFIG_HVCS)              += hvcserver.o
 obj-$(CONFIG_HCALL_STATS)       += hvCall_inst.o
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
new file mode 100644
index 000000000000..6e21ebdfcef7
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -0,0 +1,58 @@
+/*
+ * pseries CPU Hotplug infrastructure.
+ *
+ * Split out from arch/powerpc/kernel/rtas.c
+ *
+ * Peter Bergner, IBM   March 2001.
+ * Copyright (C) 2001 IBM.
+ *
+ * Copyright (C) 2006 Michael Ellerman, IBM Corporation
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/cpu.h>
+#include <asm/system.h>
+#include <asm/prom.h>
+#include <asm/rtas.h>
+#include <asm/firmware.h>
+#include <asm/machdep.h>
+#include <asm/vdso_datapage.h>
+#include <asm/pSeries_reconfig.h>
+#include "xics.h"
+
+/* This version can't take the spinlock, because it never returns */
+static struct rtas_args rtas_stop_self_args = {
+        .token = RTAS_UNKNOWN_SERVICE,
+        .nargs = 0,
+        .nret = 1,
+        .rets = &rtas_stop_self_args.args[0],
+};
+
+void rtas_stop_self(void)
+{
+        struct rtas_args *args = &rtas_stop_self_args;
+
+        local_irq_disable();
+
+        BUG_ON(args->token == RTAS_UNKNOWN_SERVICE);
+
+        printk("cpu %u (hwid %u) Ready to die...\n",
+               smp_processor_id(), hard_smp_processor_id());
+        enter_rtas(__pa(args));
+
+        panic("Alas, I survived.\n");
+}
+
+static int __init pseries_cpu_hotplug_init(void)
+{
+        rtas_stop_self_args.token = rtas_token("stop-self");
+
+        return 0;
+}
+arch_initcall(pseries_cpu_hotplug_init);