text: #include "qemu/osdep.h"
  #include "hw/xen/xen_backend.h"
  #include "sysemu/block-backend.h"
  #include "sysemu/blockdev.h"
  
  /* ------------------------------------------------------------- */
  
  static int xen_config_dev_dirs(const char *ftype, const char *btype, int vdev,
  			       char *fe, char *be, int len)
  {
      char *dom;
  
      dom = xs_get_domain_path(xenstore, xen_domid);
      snprintf(fe, len, "%s/device/%s/%d", dom, ftype, vdev);
      free(dom);
  
      dom = xs_get_domain_path(xenstore, 0);
      snprintf(be, len, "%s/backend/%s/%d/%d", dom, btype, xen_domid, vdev);
      free(dom);
  
      xenstore_mkdir(fe, XS_PERM_READ | XS_PERM_WRITE);
      xenstore_mkdir(be, XS_PERM_READ);
      return 0;
  }
  
  static int xen_config_dev_all(char *fe, char *be)
  {
      /* frontend */
      if (xen_protocol)
          xenstore_write_str(fe, "protocol", xen_protocol);
  
      xenstore_write_int(fe, "state",           XenbusStateInitialising);
      xenstore_write_int(fe, "backend-id",      0);
      xenstore_write_str(fe, "backend",         be);
  
      /* backend */
      xenstore_write_str(be, "domain",          qemu_name ? qemu_name : "no-name");
      xenstore_write_int(be, "online",          1);
      xenstore_write_int(be, "state",           XenbusStateInitialising);
      xenstore_write_int(be, "frontend-id",     xen_domid);
      xenstore_write_str(be, "frontend",        fe);
  
      return 0;
  }
  
  /* ------------------------------------------------------------- */
  
  int xen_config_dev_blk(DriveInfo *disk)
  {
      char fe[256], be[256], device_name[32];
      int vdev = 202 * 256 + 16 * disk->unit;
      int cdrom = disk->media_cd;
      const char *devtype = cdrom ? "cdrom" : "disk";
      const char *mode    = cdrom ? "r"     : "w";
      const char *filename = qemu_opt_get(disk->opts, "file");
  
      snprintf(device_name, sizeof(device_name), "xvd%c", 'a' + disk->unit);
      xen_pv_printf(NULL, 1, "config disk %d [%s]: %s\n",
                    disk->unit, device_name, filename);
      xen_config_dev_dirs("vbd", "qdisk", vdev, fe, be, sizeof(fe));
  
      /* frontend */
      xenstore_write_int(fe, "virtual-device",  vdev);
      xenstore_write_str(fe, "device-type",     devtype);
  
      /* backend */
      xenstore_write_str(be, "dev",             device_name);
      xenstore_write_str(be, "type",            "file");
      xenstore_write_str(be, "params",          filename);
      xenstore_write_str(be, "mode",            mode);
  
      /* common stuff */
      return xen_config_dev_all(fe, be);
  }
  
  int xen_config_dev_nic(NICInfo *nic)
  {
      char fe[256], be[256];
      char mac[20];
      int vlan_id = -1;
  
      net_hub_id_for_client(nic->netdev, &vlan_id);
      snprintf(mac, sizeof(mac), "%02x:%02x:%02x:%02x:%02x:%02x",
               nic->macaddr.a[0], nic->macaddr.a[1], nic->macaddr.a[2],
               nic->macaddr.a[3], nic->macaddr.a[4], nic->macaddr.a[5]);
      xen_pv_printf(NULL, 1, "config nic %d: mac=\"%s\"\n", vlan_id, mac);
      xen_config_dev_dirs("vif", "qnic", vlan_id, fe, be, sizeof(fe));
  
      /* frontend */
      xenstore_write_int(fe, "handle",     vlan_id);
      xenstore_write_str(fe, "mac",        mac);
  
      /* backend */
      xenstore_write_int(be, "handle",     vlan_id);
      xenstore_write_str(be, "mac",        mac);
  
      /* common stuff */
      return xen_config_dev_all(fe, be);
  }
  
  int xen_config_dev_vfb(int vdev, const char *type)
  {
      char fe[256], be[256];
  
      xen_config_dev_dirs("vfb", "vfb", vdev, fe, be, sizeof(fe));
  
      /* backend */
      xenstore_write_str(be, "type",  type);
  
      /* common stuff */
      return xen_config_dev_all(fe, be);
  }
  
  int xen_config_dev_vkbd(int vdev)
  {
      char fe[256], be[256];
  
      xen_config_dev_dirs("vkbd", "vkbd", vdev, fe, be, sizeof(fe));
      return xen_config_dev_all(fe, be);
  }
  
  int xen_config_dev_console(int vdev)
  {
      char fe[256], be[256];
  
      xen_config_dev_dirs("console", "console", vdev, fe, be, sizeof(fe));
      return xen_config_dev_all(fe, be);
  }
  