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 } 30