/* GSM Network Management messages on the A-bis interface 
 * 3GPP TS 12.21 version 8.0.0 Release 1999 / ETSI TS 100 623 V8.0.0 */

/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#ifndef _NM_H
#define _NM_H

#include <sys/types.h>

/* PRIVATE */

/* generic header in front of every OML message according to TS 08.59 */
struct abis_om_hdr {
	u_int8_t	mdisc;
	u_int8_t	placement;
	u_int8_t	sequence;
	u_int8_t	length;
	u_int8_t	data[0];
} __attribute__ ((packed));

#define ABIS_OM_MDISC_FOM		0x80
#define ABIS_OM_MDISC_MMI		0x40
#define ABIS_OM_MDISC_TRAU		0x20
#define ABIS_OM_MDISC_MANUF		0x10
#define ABIS_OM_PLACEMENT_ONLY		0x80
#define ABIS_OM_PLACEMENT_FIRST 	0x40
#define ABIS_OM_PLACEMENT_MIDDLE	0x20
#define ABIS_OM_PLACEMENT_LAST		0x10

struct abis_om_obj_inst {
	u_int8_t	bts_nr;
	u_int8_t	trx_nr;
	u_int8_t	ts_nr;
} __attribute__ ((packed));

struct abis_om_fom_hdr {
	u_int8_t	msg_type;
	u_int8_t	obj_class;
	struct abis_om_obj_inst	obj_inst;
	u_int8_t	data[0];
} __attribute__ ((packed));

#define ABIS_OM_FOM_HDR_SIZE	(sizeof(struct abis_om_hdr) + sizeof(struct abis_om_fom_hdr))

/* Section 9.1: Message Types */
enum abis_nm_msgtype {
	/* SW Download Management Messages */
	NM_MT_LOAD_INIT			= 0x01,
	NM_MT_LOAD_INIT_ACK,
	NM_MT_LOAD_INIT_NACK,
	NM_MT_LOAD_SEG,
	NM_MT_LOAD_SEG_ACK,
	NM_MT_LOAD_ABORT,
	NM_MT_LOAD_END,
	NM_MT_LOAD_END_ACK,
	NM_MT_LOAD_END_NACK,
	NM_MT_SW_ACT_REQ,		/* BTS->BSC */
	NM_MT_SW_ACT_REQ_ACK,
	NM_MT_SW_ACT_REQ_NACK,
	NM_MT_ACTIVATE_SW,		/* BSC->BTS */
	NM_MT_ACTIVATE_SW_ACK,
	NM_MT_ACTIVATE_SW_NACK,
	NM_MT_SW_ACTIVATED_REP,		/* 0x10 */
	/* A-bis Interface Management Messages */
	NM_MT_ESTABLISH_TEI		= 0x21,
	NM_MT_ESTABLISH_TEI_ACK,
	NM_MT_ESTABLISH_TEI_NACK,
	NM_MT_CONN_TERR_SIGN,
	NM_MT_CONN_TERR_SIGN_ACK,
	NM_MT_CONN_TERR_SIGN_NACK,
	NM_MT_DISC_TERR_SIGN,
	NM_MT_DISC_TERR_SIGN_ACK,
	NM_MT_DISC_TERR_SIGN_NACK,
	NM_MT_CONN_TERR_TRAF,
	NM_MT_CONN_TERR_TRAF_ACK,
	NM_MT_CONN_TERR_TRAF_NACK,
	NM_MT_DISC_TERR_TRAF,
	NM_MT_DISC_TERR_TRAF_ACK,
	NM_MT_DISC_TERR_TRAF_NACK,
	/* Transmission Management Messages */
	NM_MT_CONN_MDROP_LINK		= 0x31,
	NM_MT_CONN_MDROP_LINK_ACK,
	NM_MT_CONN_MDROP_LINK_NACK,
	NM_MT_DISC_MDROP_LINK,
	NM_MT_DISC_MDROP_LINK_ACK,
	NM_MT_DISC_MDROP_LINK_NACK,
	/* Air Interface Management Messages */
	NM_MT_SET_BTS_ATTR		= 0x41,
	NM_MT_SET_BTS_ATTR_ACK,
	NM_MT_SET_BTS_ATTR_NACK,
	NM_MT_SET_RADIO_ATTR,
	NM_MT_SET_RADIO_ATTR_ACK,
	NM_MT_SET_RADIO_ATTR_NACK,
	NM_MT_SET_CHAN_ATTR,
	NM_MT_SET_CHAN_ATTR_ACK,
	NM_MT_SET_CHAN_ATTR_NACK,
	/* Test Management Messages */
	NM_MT_PERF_TEST			= 0x51,
	NM_MT_PERF_TESET_ACK,
	NM_MT_PERF_TEST_NACK,
	NM_MT_TEST_REP,
	NM_MT_SEND_TEST_REP,
	NM_MT_SEND_TEST_REP_ACK,
	NM_MT_SEND_TEST_REP_NACK,
	NM_MT_STOP_TEST,
	NM_MT_STOP_TEST_ACK,
	NM_MT_STOP_TEST_NACK,
	/* State Management and Event Report Messages */
	NM_MT_STATECHG_EVENT_REP	= 0x61,
	NM_MT_FAILURE_EVENT_REP,
	NM_MT_STOP_EVENT_REP,
	NM_MT_STOP_EVENT_REP_ACK,
	NM_MT_STOP_EVENT_REP_NACK,
	NM_MT_REST_EVENT_REP,
	NM_MT_REST_EVENT_REP_ACK,
	NM_MT_REST_EVENT_REP_NACK,
	NM_MT_CHG_ADM_STATE,
	NM_MT_CHG_ADM_STATE_ACK,
	NM_MT_CHG_ADM_STATE_NACK,
	NM_MT_CHG_ADM_STATE_REQ,
	NM_MT_CHG_ADM_STATE_REQ_ACK,
	NM_MT_CHG_ADM_STATE_REQ_NACK,
	NM_MT_REP_OUTST_ALARMS		= 0x93,
	NM_MT_REP_OUTST_ALARMS_ACK,
	NM_MT_REP_OUTST_ALARMS_NACK,
	/* Equipment Management Messages */
	NM_MT_CHANGEOVER		= 0x71,
	NM_MT_CHANGEOVER_ACK,
	NM_MT_CHANGEOVER_NACK,
	NM_MT_OPSTART,
	NM_MT_OPSTART_ACK,
	NM_MT_OPSTART_NACK,
	NM_MT_REINIT,
	NM_MT_REINIT_ACK,
	NM_MT_REINIT_NACK,
	NM_MT_SET_SITE_OUT,		/* BS11: get alarm ?!? */
	NM_MT_SET_SITE_OUT_ACK,
	NM_MT_SET_SITE_OUT_NACK,
	NM_MT_CHG_HW_CONF		= 0x90,
	NM_MT_CHG_HW_CONF_ACK,
	NM_MT_CHG_HW_CONF_NACK,
	/* Measurement Management Messages */
	NM_MT_MEAS_RES_REQ		= 0x8a,
	NM_MT_MEAS_RES_RESP,
	NM_MT_STOP_MEAS,
	NM_MT_START_MEAS,
	/* Other Messages */
	NM_MT_GET_ATTR			= 0x81,
	NM_MT_GET_ATTR_RESP,
	NM_MT_GET_ATTR_NACK,
	NM_MT_SET_ALARM_THRES,
	NM_MT_SET_ALARM_THRES_ACK,
	NM_MT_SET_ALARM_THRES_NACK,
	
	NM_MT_BS11_RESET_RESOURCE	= 0x74,

	NM_MT_BS11_BEGIN_DB_TX		= 0xa3,
	NM_MT_BS11_BEGIN_DB_TX_ACK,
	NM_MT_BS11_BEGIN_DB_TX_NACK,
	NM_MT_BS11_END_DB_TX		= 0xa6,
	NM_MT_BS11_END_DB_TX_ACK,
	NM_MT_BS11_END_DB_TX_NACK,
	NM_MT_BS11_CREATE_OBJ		= 0xa9,
	NM_MT_BS11_CREATE_OBJ_ACK,
	NM_MT_BS11_CREATE_OBJ_NACK,
	NM_MT_BS11_DELETE_OBJ		= 0xac,
	NM_MT_BS11_DELETE_OBJ_ACK,
	NM_MT_BS11_DELETE_OBJ_NACK,

	NM_MT_BS11_SET_ATTR		= 0xd0,
	NM_MT_BS11_SET_ATTR_ACK,
	NM_MT_BS11_LMT_SESSION		= 0xdc,

	NM_MT_BS11_GET_STATE		= 0xe3,
	NM_MT_BS11_GET_STATE_ACK,
	NM_MT_BS11_LMT_LOGON		= 0xe5,
	NM_MT_BS11_LMT_LOGON_ACK,
	NM_MT_BS11_RESTART		= 0xe7,
	NM_MT_BS11_RESTART_ACK,
	NM_MT_BS11_DISCONNECT		= 0xe9,
	NM_MT_BS11_DISCONNECT_ACK,
	NM_MT_BS11_LMT_LOGOFF		= 0xec,
	NM_MT_BS11_LMT_LOGOFF_ACK,
	NM_MT_BS11_RECONNECT		= 0xf1,
	NM_MT_BS11_RECONNECT_ACK,
};

/* Section 9.2: Object Class */
enum abis_nm_obj_class {
	NM_OC_SITE_MANAGER		= 0x00,
	NM_OC_BTS,
	NM_OC_RADIO_CARRIER,
	NM_OC_CHANNEL,
	NM_OC_BASEB_TRANSC,
	/* RFU: 05-FE */
	NM_OC_BS11_A0			= 0xa0,
	NM_OC_BS11_A3			= 0xa3,
	NM_OC_BS11_A4			= 0xa4,
	NM_OC_BS11			= 0xa5,
	NM_OC_BS11_A6			= 0xa6,
	NM_OC_BS11_ENVABTSE		= 0xa8,
	NM_OC_BS11_BPORT		= 0xa9,

	NM_OC_NULL			= 0xff,
};

/* Section 9.4: Attributes */
enum abis_nm_attr {
	NM_ATT_ABIS_CHANNEL	= 0x01,
	NM_ATT_ADD_INFO,
	NM_ATT_ADD_TEXT,
	NM_ATT_ADM_STATE,
	NM_ATT_ARFCN_LIST,
	NM_ATT_AUTON_REPORT,
	NM_ATT_AVAIL_STATUS,
	NM_ATT_BCCH_ARFCN,
	NM_ATT_BSIC,
	NM_ATT_BTS_AIR_TIMER,
	NM_ATT_CCCH_L_I_P,
	NM_ATT_CCCH_L_T,
	NM_ATT_CHAN_COMB,
	NM_ATT_CONN_FAIL_CRIT,
	NM_ATT_DEST,
	/* res */
	NM_ATT_EVENT_TYPE	= 0x11, /* BS11: file data ?!? */
	NM_ATT_FILE_ID,
	NM_ATT_FILE_VERSION,
	NM_ATT_GSM_TIME,
	NM_ATT_HSN,
	NM_ATT_HW_CONFIG,
	NM_ATT_HW_DESC,
	NM_ATT_INTAVE_PARAM,
	NM_ATT_INTERF_BOUND,
	NM_ATT_LIST_REQ_ATTR,
	NM_ATT_MAIO,
	NM_ATT_MANUF_STATE,
	NM_ATT_MANUF_THRESH,
	NM_ATT_MANUF_ID,
	NM_ATT_MAX_TA,
	NM_ATT_MDROP_LINK,	/* 0x20 */
	NM_ATT_MDROP_NEXT,
	NM_ATT_NACK_CAUSES,
	NM_ATT_NY1,
	NM_ATT_OPER_STATE,
	NM_ATT_OVERL_PERIOD,
	NM_ATT_PHYS_CONF,
	NM_ATT_POWER_CLASS,
	NM_ATT_POWER_THRESH,
	NM_ATT_PROB_CAUSE,
	NM_ATT_RACH_B_THRESH,
	NM_ATT_LDAVG_SLOTS,
	NM_ATT_RAD_SUBC,
	NM_ATT_RF_MAXPOWR_R,
	NM_ATT_SITE_INPUTS,
	NM_ATT_SITE_OUTPUTS,
	NM_ATT_SOURCE,		/* 0x30 */
	NM_ATT_SPEC_PROB,
	NM_ATT_START_TIME,
	NM_ATT_T200,
	NM_ATT_TEI,
	NM_ATT_TEST_DUR,
	NM_ATT_TEST_NO,
	NM_ATT_TEST_REPORT,
	NM_ATT_VSWR_THRESH,
	NM_ATT_WINDOW_SIZE,
	/* Res  */
	NM_ATT_BS11_RSSI_OFFS	= 0x3d,
	NM_ATT_BS11_TXPWR	= 0x3e,
	NM_ATT_BS11_DIVERSITY	= 0x3f,
	/* Res  */
	NM_ATT_TSC		= 0x40,
	NM_ATT_SW_CONFIG,
	NM_ATT_SW_DESCR,
	NM_ATT_SEVERITY,
	NM_ATT_GET_ARI,
	NM_ATT_HW_CONF_CHG,
	NM_ATT_OUTST_ALARM,
	NM_ATT_FILE_DATA,
	NM_ATT_MEAS_RES,
	NM_ATT_MEAS_TYPE,

	NM_ATT_BS11_ESN_FW_CODE_NO	= 0x4c,
	NM_ATT_BS11_ESN_HW_CODE_NO	= 0x4f,

	NM_ATT_BS11_ESN_PCB_SERIAL	= 0x55,

	NM_ATT_BS11_ALL_TEST_CATG	= 0x60,
	NM_ATT_BS11_BTSLS_HOPPING,
	NM_ATT_BS11_CELL_ALLOC_NR,
	NM_ATT_BS11_CALL_GLOBAL_ID,
	NM_ATT_BS11_ENA_INTERF_CLASS	= 0x66,
	NM_ATT_BS11_ENA_INT_INTEC_HANDO	= 0x67,
	NM_ATT_BS11_ENA_INT_INTRC_HANDO	= 0x68,
	NM_ATT_BS11_ENA_MS_PWR_CTRL	= 0x69,
	NM_ATT_BS11_ENA_PWR_BDGT_HO	= 0x6a,
	NM_ATT_BS11_ENA_PWR_CTRL_RLFW	= 0x6b,
	NM_ATT_BS11_ENA_RXLEV_HO	= 0x6c,
	NM_ATT_BS11_ENA_RXQUAL_HO	= 0x6d,
	
	NM_ATT_BS11_RX_LEV_MIN_CELL	= 0x90,
	NM_ATT_BS11_ABIS_EXT_TIME	= 0x91,
	NM_ATT_BS11_TIMER_HO_REQUEST	= 0x92,
	NM_ATT_BS11_TIMER_NCELL		= 0x93,
	NM_ATT_BS11_TSYNC		= 0x94,
	NM_ATT_BS11_TTRAU		= 0x95,

	NM_ATT_BS11_BCCH_RECONF		= 0xd7,
	NM_ATT_BS11_BIT_ERR_THESH	= 0xa0,
	NM_ATT_BS11_BOOT_SW_VERS	= 0xa1,
	NM_ATT_BS11_CCLK_ACCURACY	= 0xa3,
	NM_ATT_BS11_CCLK_TYPE		= 0xa4,
	NM_ATT_BS11_INP_IMPEDANCE	= 0xaa,
	NM_ATT_BS11_L1_PROT_TYPE	= 0xab,
	NM_ATT_BS11_LINE_CFG		= 0xac,
	NM_ATT_BS11_LI_PORT_1		= 0xad,
	NM_ATT_BS11_LI_PORT_2		= 0xae,

	NM_ATT_BS11_L1_REM_ALM_TYPE	= 0xb0,
	NM_ATT_BS11_SW_LOAD_INTENDED	= 0xbb,
	NM_ATT_BS11_SW_LOAD_SAFETY	= 0xbc,
	NM_ATT_BS11_SW_LOAD_STORED	= 0xbd,

	NM_ATT_BS11_VENDOR_NAME		= 0xc1,
	NM_ATT_BS11_LMT_LOGON_SESSION	= 0xc6,
	NM_ATT_BS11_LMT_LOGIN_TIME	= 0xc7,
	NM_ATT_BS11_LMT_USER_ACC_LEV	= 0xc8,
	NM_ATT_BS11_LMT_USER_NAME	= 0xc9,

	NM_ATT_BS11_L1_CONTROL_TS	= 0xd8,

	NM_ATT_BS11_PLL			= 0xf2,
	NM_ATT_BS11_RX_OFFSET		= 0xf3,
	NM_ATT_BS11_ANT_TYPE		= 0xf4,
	NM_ATT_BS11_PASSWORD		= 0xfd,
};
#define NM_ATT_BS11_FILE_DATA	NM_ATT_EVENT_TYPE

/* Section 9.4.4: Administrative State */
enum abis_nm_adm_state {
	NM_STATE_LOCKED		= 0x01,
	NM_STATE_UNLOCKED	= 0x02,
	NM_STATE_SHUTDOWN	= 0x03,
	NM_STATE_NULL		= 0xff,
};

/* Section 9.4.13: Channel Combination */
enum abis_nm_chan_comb {
	NM_CHANC_TCHFull	= 0x00,
	NM_CHANC_TCHHalf	= 0x01,
	NM_CHANC_TCHHalf2	= 0x02,
	NM_CHANC_SDCCH		= 0x03,
	NM_CHANC_mainBCCH	= 0x04,
	NM_CHANC_BCCCHComb	= 0x05,
	NM_CHANC_BCCH		= 0x06,
	NM_CHANC_BCCH_CBCH	= 0x07,
	NM_CHANC_SDCCH_CBCH	= 0x08,
};

/* Section 9.4.1 */
struct abis_nm_channel {
	u_int8_t	attrib;
	u_int8_t	bts_port;
	u_int8_t	timeslot;
	u_int8_t	subslot;
} __attribute__ ((packed));

/* Siemens BS-11 specific */
enum abis_bs11_objtype {
	BS11_OBJ_ALCO		= 0x01,
	BS11_OBJ_BBSIG		= 0x02,	/* obj_class: 0,1 */
	BS11_OBJ_TRX1		= 0x03,	/* only DEACTIVATE TRX1 */
	BS11_OBJ_CCLK		= 0x04,
	BS11_OBJ_GPSU		= 0x06,
	BS11_OBJ_LI		= 0x07,
	BS11_OBJ_PA		= 0x09,	/* obj_class: 0, 1*/
};

enum abis_bs11_trx_power {
	BS11_TRX_POWER_GSM_2W	= 0x06,
	BS11_TRX_POWER_GSM_250mW= 0x07,
	BS11_TRX_POWER_GSM_80mW	= 0x08,
	BS11_TRX_POWER_GSM_30mW	= 0x09,
	BS11_TRX_POWER_DCS_3W	= 0x0a,
	BS11_TRX_POWER_DCS_1W6	= 0x0b,
	BS11_TRX_POWER_DCS_500mW= 0x0c,
	BS11_TRX_POWER_DCS_160mW= 0x0d,
};

enum abis_bs11_phase {
	BS11_STATE_SOFTWARE_RQD		= 0x01,
	BS11_STATE_LOAD_SMU_INTENDED	= 0x11,
	BS11_STATE_LOAD_SMU_SAFETY	= 0x21,
	BS11_STATE_LOAD_FAILED		= 0x31,
	BS11_STATE_LOAD_DIAGNOSTIC	= 0x41,
	BS11_STATE_WARM_UP		= 0x51,
	BS11_STATE_WARM_UP_2		= 0x52,
	BS11_STATE_WAIT_MIN_CFG		= 0x62,
	BS11_STATE_MAINTENANCE		= 0x72,
	BS11_STATE_LOAD_MBCCU		= 0x92,
	BS11_STATE_WAIT_MIN_CFG_2	= 0xA2,
	BS11_STATE_NORMAL		= 0x03,
	BS11_STATE_ABIS_LOAD		= 0x13,
};


/* PUBLIC */

struct msgb;

struct abis_nm_cfg {
	/* callback for unidirectional reports */
	int (*report_cb)(struct msgb *,
			 struct abis_om_fom_hdr *);
	/* callback for software activate requests from BTS */
	int (*sw_act_req)(struct msgb *);
};

extern int abis_nm_rcvmsg(struct msgb *msg);
//extern struct abis_nm_h *abis_nm_init(struct abis_nm_cfg *cfg);
//extern void abis_nm_fini(struct abis_nm_h *nmh);

int abis_nm_rx(struct msgb *msg);
int abis_nm_opstart(struct gsm_bts *bts, u_int8_t obj_class, u_int8_t i0, u_int8_t i1, u_int8_t i2);
int abis_nm_chg_adm_state(struct gsm_bts *bts, u_int8_t obj_class, u_int8_t i0,
			  u_int8_t i1, u_int8_t i2, u_int8_t adm_state);
int abis_nm_establish_tei(struct gsm_bts *bts, u_int8_t trx_nr,
			  u_int8_t e1_port, u_int8_t e1_timeslot, u_int8_t e1_subslot,
			  u_int8_t tei);
int abis_nm_conn_terr_sign(struct gsm_bts_trx *trx,
			   u_int8_t e1_port, u_int8_t e1_timeslot, u_int8_t e1_subslot);
int abis_nm_conn_terr_traf(struct gsm_bts_trx_ts *ts,
			   u_int8_t e1_port, u_int8_t e1_timeslot,
			   u_int8_t e1_subslot);
int abis_nm_set_bts_attr(struct gsm_bts *bts, u_int8_t *attr, int attr_len);
int abis_nm_set_radio_attr(struct gsm_bts_trx *trx, u_int8_t *attr, int attr_len);
int abis_nm_set_channel_attr(struct gsm_bts_trx_ts *ts, u_int8_t chan_comb);
int abis_nm_sw_act_req_ack(struct gsm_bts *bts, u_int8_t obj_class, u_int8_t i1,
			u_int8_t i2, u_int8_t i3, u_int8_t *attr, int att_len);
int abis_nm_raw_msg(struct gsm_bts *bts, int len, u_int8_t *msg);
int abis_nm_event_reports(struct gsm_bts *bts, int on);
int abis_nm_reset_resource(struct gsm_bts *bts);
int abis_nm_software_load(struct gsm_bts *bts, const char *fname,
			  u_int8_t win_size, int forced,
			  gsm_cbfn *cbfn, void *cb_data);
int abis_nm_software_load_status(struct gsm_bts *bts);
int abis_nm_software_activate(struct gsm_bts *bts, const char *fname,
			      gsm_cbfn *cbfn, void *cb_data);

/* Siemens / BS-11 specific */
int abis_nm_bs11_reset_resource(struct gsm_bts *bts);
int abis_nm_bs11_db_transmission(struct gsm_bts *bts, int begin);
int abis_nm_bs11_create_object(struct gsm_bts *bts, enum abis_bs11_objtype type,
			  u_int8_t idx, u_int8_t attr_len, const u_int8_t *attr);
int abis_nm_bs11_create_envaBTSE(struct gsm_bts *bts, u_int8_t idx);
int abis_nm_bs11_create_bport(struct gsm_bts *bts, u_int8_t idx);
int abis_nm_bs11_set_oml_tei(struct gsm_bts *bts, u_int8_t tei);
int abis_nm_bs11_conn_oml(struct gsm_bts *bts, u_int8_t e1_port,
			  u_int8_t e1_timeslot, u_int8_t e1_subslot);
int abis_nm_bs11_set_trx_power(struct gsm_bts_trx *trx, u_int8_t level);
int abis_nm_bs11_factory_logon(struct gsm_bts *bts, int on);
int abis_nm_bs11_set_trx1_pw(struct gsm_bts *bts, const char *password);
int abis_nm_bs11_get_state(struct gsm_bts *bts);
int abis_nm_bs11_load_swl(struct gsm_bts *bts, const char *fname,
			  u_int8_t win_size, int forced, gsm_cbfn *cbfn);
int abis_nm_bs11_set_ext_time(struct gsm_bts *bts);
int abis_nm_bs11_bsc_disconnect(struct gsm_bts *bts, int reconnect);
int abis_nm_bs11_restart(struct gsm_bts *bts);

#endif /* _NM_H */