1 files changed, 52 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/epapr_paravirt.c b/arch/powerpc/kernel/epapr_paravirt.c
new file mode 100644
index 000000000000..028aeae370b6
--- /dev/null
+++ b/arch/powerpc/kernel/epapr_paravirt.c
@@ -0,0 +1,52 @@
+/*
+ * ePAPR para-virtualization support.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ */
+
+#include <linux/of.h>
+#include <asm/epapr_hcalls.h>
+#include <asm/cacheflush.h>
+#include <asm/code-patching.h>
+
+bool epapr_paravirt_enabled;
+
+static int __init epapr_paravirt_init(void)
+{
+        struct device_node *hyper_node;
+        const u32 *insts;
+        int len, i;
+
+        hyper_node = of_find_node_by_path("/hypervisor");
+        if (!hyper_node)
+                return -ENODEV;
+
+        insts = of_get_property(hyper_node, "hcall-instructions", &len);
+        if (!insts)
+                return -ENODEV;
+
+        if (len % 4 || len > (4 * 4))
+                return -ENODEV;
+
+        for (i = 0; i < (len / 4); i++)
+                patch_instruction(epapr_hypercall_start + i, insts[i]);
+
+        epapr_paravirt_enabled = true;
+
+        return 0;
+}
+
+early_initcall(epapr_paravirt_init);