1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /****************************************************************************** 3*4882a593Smuzhiyun * features.c 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Xen feature flags. 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Copyright (c) 2006, Ian Campbell, XenSource Inc. 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun #include <linux/types.h> 10*4882a593Smuzhiyun #include <linux/cache.h> 11*4882a593Smuzhiyun #include <linux/export.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun #include <asm/xen/hypercall.h> 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun #include <xen/interface/xen.h> 16*4882a593Smuzhiyun #include <xen/interface/version.h> 17*4882a593Smuzhiyun #include <xen/features.h> 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly; 20*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(xen_features); 21*4882a593Smuzhiyun xen_setup_features(void)22*4882a593Smuzhiyunvoid xen_setup_features(void) 23*4882a593Smuzhiyun { 24*4882a593Smuzhiyun struct xen_feature_info fi; 25*4882a593Smuzhiyun int i, j; 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) { 28*4882a593Smuzhiyun fi.submap_idx = i; 29*4882a593Smuzhiyun if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0) 30*4882a593Smuzhiyun break; 31*4882a593Smuzhiyun for (j = 0; j < 32; j++) 32*4882a593Smuzhiyun xen_features[i * 32 + j] = !!(fi.submap & 1U << j); 33*4882a593Smuzhiyun } 34*4882a593Smuzhiyun } 35