xen: move features.c from arch/x86/xen/features.c to drivers/xen

ia64/xen also uses it too. Move it into common place so that
ia64/xen can share the code.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 30 insertions, 1 deletions

diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 56592f0d6cef..609fdda90a34 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -1,2 +1,2 @@
-obj-y   += grant-table.o
+obj-y   += grant-table.o features.o
 obj-y   += xenbus/
diff --git a/drivers/xen/features.c b/drivers/xen/features.c
new file mode 100644
index 000000000000..0707714e40d6
--- /dev/null
+++ b/drivers/xen/features.c
@@ -0,0 +1,29 @@
+/******************************************************************************
+ * features.c
+ *
+ * Xen feature flags.
+ *
+ * Copyright (c) 2006, Ian Campbell, XenSource Inc.
+ */
+#include <linux/types.h>
+#include <linux/cache.h>
+#include <linux/module.h>
+#include <asm/xen/hypervisor.h>
+#include <xen/features.h>
+
+u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
+EXPORT_SYMBOL_GPL(xen_features);
+
+void xen_setup_features(void)
+{
+        struct xen_feature_info fi;
+        int i, j;
+
+        for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) {
+                fi.submap_idx = i;
+                if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0)
+                        break;
+                for (j = 0; j < 32; j++)
+                        xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
+        }
+}