C++ (Cpp) xenbus_ring_ops_init Examples

Example #1

File: xenbus_probe.c Project: 020gzh/linux

static int __init xenbus_init(void)
{
	int err = 0;
	uint64_t v = 0;
	xen_store_domain_type = XS_UNKNOWN;

	if (!xen_domain())
		return -ENODEV;

	xenbus_ring_ops_init();

	if (xen_pv_domain())
		xen_store_domain_type = XS_PV;
	if (xen_hvm_domain())
		xen_store_domain_type = XS_HVM;
	if (xen_hvm_domain() && xen_initial_domain())
		xen_store_domain_type = XS_LOCAL;
	if (xen_pv_domain() && !xen_start_info->store_evtchn)
		xen_store_domain_type = XS_LOCAL;
	if (xen_pv_domain() && xen_start_info->store_evtchn)
		xenstored_ready = 1;

	switch (xen_store_domain_type) {
	case XS_LOCAL:
		err = xenstored_local_init();
		if (err)
			goto out_error;
		xen_store_interface = gfn_to_virt(xen_store_gfn);
		break;
	case XS_PV:
		xen_store_evtchn = xen_start_info->store_evtchn;
		xen_store_gfn = xen_start_info->store_mfn;
		xen_store_interface = gfn_to_virt(xen_store_gfn);
		break;
	case XS_HVM:
		err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
		if (err)
			goto out_error;
		xen_store_evtchn = (int)v;
		err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v);
		if (err)
			goto out_error;
		xen_store_gfn = (unsigned long)v;
		xen_store_interface =
			xen_remap(xen_store_gfn << XEN_PAGE_SHIFT,
				  XEN_PAGE_SIZE);
		break;
	default:
		pr_warn("Xenstore state unknown\n");
		break;
	}

	/* Initialize the interface to xenstore. */
	err = xs_init();
	if (err) {
		pr_warn("Error initializing xenstore comms: %i\n", err);
		goto out_error;
	}

	if ((xen_store_domain_type != XS_LOCAL) &&
	    (xen_store_domain_type != XS_UNKNOWN))
		xen_resume_notifier_register(&xenbus_resume_nb);

#ifdef CONFIG_XEN_COMPAT_XENFS
	/*
	 * Create xenfs mountpoint in /proc for compatibility with
	 * utilities that expect to find "xenbus" under "/proc/xen".
	 */
	proc_mkdir("xen", NULL);
#endif

out_error:
	return err;
}

Example #2

File: xenbus_probe.c Project: AiWinters/linux

static int __init xenbus_init(void)
{
	int err = 0;
	enum xenstore_init usage = UNKNOWN;
	uint64_t v = 0;

	if (!xen_domain())
		return -ENODEV;

	xenbus_ring_ops_init();

	if (xen_pv_domain())
		usage = PV;
	if (xen_hvm_domain())
		usage = HVM;
	if (xen_hvm_domain() && xen_initial_domain())
		usage = LOCAL;
	if (xen_pv_domain() && !xen_start_info->store_evtchn)
		usage = LOCAL;
	if (xen_pv_domain() && xen_start_info->store_evtchn)
		xenstored_ready = 1;

	switch (usage) {
	case LOCAL:
		err = xenstored_local_init();
		if (err)
			goto out_error;
		xen_store_interface = mfn_to_virt(xen_store_mfn);
		break;
	case PV:
		xen_store_evtchn = xen_start_info->store_evtchn;
		xen_store_mfn = xen_start_info->store_mfn;
		xen_store_interface = mfn_to_virt(xen_store_mfn);
		break;
	case HVM:
		err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
		if (err)
			goto out_error;
		xen_store_evtchn = (int)v;
		err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v);
		if (err)
			goto out_error;
		xen_store_mfn = (unsigned long)v;
		xen_store_interface =
			xen_remap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
		break;
	default:
		pr_warn("Xenstore state unknown\n");
		break;
	}

	/* Initialize the interface to xenstore. */
	err = xs_init();
	if (err) {
		printk(KERN_WARNING
		       "XENBUS: Error initializing xenstore comms: %i\n", err);
		goto out_error;
	}

#ifdef CONFIG_XEN_COMPAT_XENFS
	/*
	 * Create xenfs mountpoint in /proc for compatibility with
	 * utilities that expect to find "xenbus" under "/proc/xen".
	 */
	proc_mkdir("xen", NULL);
#endif

out_error:
	return err;
}