1/******************************************************************************
2 * features.c
3 *
4 * Xen feature flags.
5 *
6 * Copyright (c) 2006, Ian Campbell, XenSource Inc.
7 */
8#include <linux/types.h>
9#include <linux/cache.h>
10#include <linux/export.h>
11
12#include <asm/xen/hypercall.h>
13
14#include <xen/interface/xen.h>
15#include <xen/interface/version.h>
16#include <xen/features.h>
17
18u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
19EXPORT_SYMBOL_GPL(xen_features);
20
21void xen_setup_features(void)
22{
23 struct xen_feature_info fi;
24 int i, j;
25
26 for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) {
27 fi.submap_idx = i;
28 if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0)
29 break;
30 for (j = 0; j < 32; j++)
31 xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
32 }
33}
34