/*
 *
 * Copyright (c) 2009, Microsoft Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * Authors:
 *   Haiyang Zhang <haiyangz@microsoft.com>
 *   Hank Janssen  <hjanssen@microsoft.com>
 *
 */


#ifndef __HV_H__
#define __HV_H__

#include "hv_api.h"

enum {
	VMBUS_MESSAGE_CONNECTION_ID	= 1,
	VMBUS_MESSAGE_PORT_ID		= 1,
	VMBUS_EVENT_CONNECTION_ID	= 2,
	VMBUS_EVENT_PORT_ID		= 2,
	VMBUS_MONITOR_CONNECTION_ID	= 3,
	VMBUS_MONITOR_PORT_ID		= 3,
	VMBUS_MESSAGE_SINT		= 2,
};

/* #defines */

#define HV_PRESENT_BIT			0x80000000

#define HV_LINUX_GUEST_ID_LO		0x00000000
#define HV_LINUX_GUEST_ID_HI		0xB16B00B5
#define HV_LINUX_GUEST_ID		(((u64)HV_LINUX_GUEST_ID_HI << 32) | \
					   HV_LINUX_GUEST_ID_LO)

#define HV_CPU_POWER_MANAGEMENT		(1 << 0)
#define HV_RECOMMENDATIONS_MAX		4

#define HV_X64_MAX			5
#define HV_CAPS_MAX			8


#define HV_HYPERCALL_PARAM_ALIGN	sizeof(u64)


/* Service definitions */

#define HV_SERVICE_PARENT_PORT				(0)
#define HV_SERVICE_PARENT_CONNECTION			(0)

#define HV_SERVICE_CONNECT_RESPONSE_SUCCESS		(0)
#define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER	(1)
#define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE	(2)
#define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED	(3)

#define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID		(1)
#define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID		(2)
#define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID	(3)
#define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID	(4)
#define HV_SERVICE_MAX_MESSAGE_ID				(4)

#define HV_SERVICE_PROTOCOL_VERSION (0x0010)
#define HV_CONNECT_PAYLOAD_BYTE_COUNT 64

/* #define VMBUS_REVISION_NUMBER	6 */

/* Our local vmbus's port and connection id. Anything >0 is fine */
/* #define VMBUS_PORT_ID		11 */

/* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
static const struct hv_guid VMBUS_SERVICE_ID = {
	.data = {
		0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
		0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
	},
};

#define MAX_NUM_CPUS	32


struct hv_input_signal_event_buffer {
	u64 align8;
	struct hv_input_signal_event event;
};

struct hv_context {
	/* We only support running on top of Hyper-V
	* So at this point this really can only contain the Hyper-V ID
	*/
	u64 guestid;

	void *hypercall_page;

	bool synic_initialized;

	/*
	 * This is used as an input param to HvCallSignalEvent hypercall. The
	 * input param is immutable in our usage and must be dynamic mem (vs
	 * stack or global). */
	struct hv_input_signal_event_buffer *signal_event_buffer;
	/* 8-bytes aligned of the buffer above */
	struct hv_input_signal_event *signal_event_param;

	void *synic_message_page[MAX_NUM_CPUS];
	void *synic_event_page[MAX_NUM_CPUS];
};

extern struct hv_context hv_context;


/* Hv Interface */

extern int hv_init(void);

extern void hv_cleanup(void);

extern u16 hv_post_message(union hv_connection_id connection_id,
			 enum hv_message_type message_type,
			 void *payload, size_t payload_size);

extern u16 hv_signal_event(void);

extern void hv_synic_init(void *irqarg);

extern void hv_synic_cleanup(void *arg);

#endif /* __HV_H__ */