/******************************************************************************
   * features.c
   *
   * Xen feature flags.
   *
   * Copyright (c) 2006, Ian Campbell, XenSource Inc.
   */
  #include <linux/types.h>
  #include <linux/cache.h>
  #include <linux/module.h>

  
  #include <asm/xen/hypercall.h>
  
  #include <xen/interface/xen.h>
  #include <xen/interface/version.h>

  #include <xen/features.h>
  
  u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
  EXPORT_SYMBOL_GPL(xen_features);
  
  void xen_setup_features(void)
  {
  	struct xen_feature_info fi;
  	int i, j;
  
  	for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) {
  		fi.submap_idx = i;
  		if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0)
  			break;
  		for (j = 0; j < 32; j++)
  			xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
  	}
  }