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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/module.h>
11 #include <asm/xen/hypervisor.h>
12 #include <xen/features.h>
13
14 u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
15 EXPORT_SYMBOL_GPL(xen_features);
16
17 void xen_setup_features(void)
18 {
19         struct xen_feature_info fi;
20         int i, j;
21
22         for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) {
23                 fi.submap_idx = i;
24                 if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0)
25                         break;
26                 for (j = 0; j < 32; j++)
27                         xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
28         }
29 }