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 18 u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly; 19 EXPORT_SYMBOL_GPL(xen_features); 20 21 void 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