X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=blobdiff_plain;f=src%2Fjtag%2Fjtag.h;h=95a86e65aa1d35c12608fe9f51f9fdb004d8ae6a;hp=0e48a020273781da4b6a0a3d894b2998a69f6b3d;hb=81184adfb0bf71e25674f827ef92a48092b88d6b;hpb=3b5690ade1b013136ed9b54337c2d5b2c695aa25 diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h index 0e48a02027..95a86e65aa 100644 --- a/src/jtag/jtag.h +++ b/src/jtag/jtag.h @@ -1,327 +1,326 @@ -/*************************************************************************** - * Copyright (C) 2005 by Dominic Rath * - * Dominic.Rath@gmx.de * - * * - * 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., * - * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * - ***************************************************************************/ -#ifndef JTAG_H -#define JTAG_H - -#include "types.h" -#include "binarybuffer.h" - -#include "command.h" - -#if 0 -#define _DEBUG_JTAG_IO_ -#endif - -/* Tap States - * TLR - Test-Logic-Reset, RTI - Run-Test/Idle, - * SDS - Select-DR-Scan, CD - Capture-DR, SD - Shift-DR, E1D - Exit1-DR, - * PD - Pause-DR, E2D - Exit2-DR, UD - Update-DR, - * SIS - Select-IR-Scan, CI - Capture-IR, SI - Shift-IR, E1I - Exit1-IR, - * PI - Pause-IR, E2I - Exit2-IR, UI - Update-IR - */ -enum tap_state -{ - TAP_TLR = 0x0, TAP_RTI = 0x8, - TAP_SDS = 0x1, TAP_CD = 0x2, TAP_SD = 0x3, TAP_E1D = 0x4, - TAP_PD = 0x5, TAP_E2D = 0x6, TAP_UD = 0x7, - TAP_SIS = 0x9, TAP_CI = 0xa, TAP_SI = 0xb, TAP_E1I = 0xc, - TAP_PI = 0xd, TAP_E2I = 0xe, TAP_UI = 0xf -}; - -typedef struct tap_transition_s -{ - enum tap_state high; - enum tap_state low; -} tap_transition_t; - -extern char* tap_state_strings[16]; -extern int tap_move_map[16]; /* map 16 TAP states to 6 stable states */ -extern u8 tap_move[6][6]; /* value scanned to TMS to move from one of six stable states to another */ -extern tap_transition_t tap_transitions[16]; /* describe the TAP state diagram */ - -extern enum tap_state end_state; /* finish DR scans in dr_end_state */ -extern enum tap_state cur_state; /* current TAP state */ - -extern enum tap_state cmd_queue_end_state; /* finish DR scans in dr_end_state */ -extern enum tap_state cmd_queue_cur_state; /* current TAP state */ - -#define TAP_MOVE(from, to) tap_move[tap_move_map[from]][tap_move_map[to]] - -typedef void * error_handler_t; /* Later on we can delete error_handler_t, but keep it for now to make patches more readable */ - -struct scan_field_s; -typedef int (*in_handler_t)(u8 *in_value, void *priv, struct scan_field_s *field); - -typedef struct scan_field_s -{ - int device; /* ordinal device number this instruction refers to */ - int num_bits; /* number of bits this field specifies (up to 32) */ - u8 *out_value; /* value to be scanned into the device */ - u8 *out_mask; /* only masked bits care */ - u8 *in_value; /* pointer to a 32-bit memory location to take data scanned out */ - /* in_check_value/mask, in_handler_error_handler, in_handler_priv can be used by the in handler, otherwise they contain garbage */ - u8 *in_check_value; /* used to validate scan results */ - u8 *in_check_mask; /* check specified bits against check_value */ - in_handler_t in_handler; /* process received buffer using this handler */ - void *in_handler_priv; /* additional information for the in_handler */ -} scan_field_t; - -enum scan_type -{ - /* IN: from device to host, OUT: from host to device */ - SCAN_IN = 1, SCAN_OUT = 2, SCAN_IO = 3 -}; - -typedef struct scan_command_s -{ - int ir_scan; /* instruction/not data scan */ - int num_fields; /* number of fields in *fields array */ - scan_field_t *fields; /* pointer to an array of data scan fields */ - enum tap_state end_state; /* TAP state in which JTAG commands should finish */ -} scan_command_t; - -typedef struct statemove_command_s -{ - enum tap_state end_state; /* TAP state in which JTAG commands should finish */ -} statemove_command_t; - -typedef struct pathmove_command_s -{ - int num_states; /* number of states in *path */ - enum tap_state *path; /* states that have to be passed */ -} pathmove_command_t; - -typedef struct runtest_command_s -{ - int num_cycles; /* number of cycles that should be spent in Run-Test/Idle */ - enum tap_state end_state; /* TAP state in which JTAG commands should finish */ -} runtest_command_t; - -typedef struct reset_command_s -{ - int trst; /* trst/srst 0: deassert, 1: assert, -1: don't change */ - int srst; -} reset_command_t; - -typedef struct end_state_command_s -{ - enum tap_state end_state; /* TAP state in which JTAG commands should finish */ -} end_state_command_t; - -typedef struct sleep_command_s -{ - u32 us; /* number of microseconds to sleep */ -} sleep_command_t; - -typedef union jtag_command_container_u -{ - scan_command_t *scan; - statemove_command_t *statemove; - pathmove_command_t *pathmove; - runtest_command_t *runtest; - reset_command_t *reset; - end_state_command_t *end_state; - sleep_command_t *sleep; -} jtag_command_container_t; - -enum jtag_command_type -{ - JTAG_SCAN = 1, - JTAG_STATEMOVE = 2, JTAG_RUNTEST = 3, - JTAG_RESET = 4, JTAG_END_STATE = 5, - JTAG_PATHMOVE = 6, JTAG_SLEEP = 7 -}; - -typedef struct jtag_command_s -{ - jtag_command_container_t cmd; - enum jtag_command_type type; - struct jtag_command_s *next; -} jtag_command_t; - -extern jtag_command_t *jtag_command_queue; - -typedef struct jtag_device_s -{ - int ir_length; /* size of instruction register */ - u8 *expected; /* Capture-IR expected value */ - u8 *expected_mask; /* Capture-IR expected mask */ - u32 idcode; /* device identification code */ - u8 *cur_instr; /* current instruction */ - int bypass; /* bypass register selected */ - struct jtag_device_s *next; -} jtag_device_t; - -extern jtag_device_t *jtag_devices; -extern int jtag_num_devices; -extern int jtag_ir_scan_size; - -enum reset_line_mode -{ - LINE_OPEN_DRAIN = 0x0, - LINE_PUSH_PULL = 0x1, -}; - -typedef struct jtag_interface_s -{ - char* name; - - /* queued command execution - */ - int (*execute_queue)(void); - - /* interface initalization - */ - int (*speed)(int speed); - int (*register_commands)(struct command_context_s *cmd_ctx); - int (*init)(void); - int (*quit)(void); - -} jtag_interface_t; - -enum jtag_event -{ - JTAG_SRST_ASSERTED, - JTAG_TRST_ASSERTED, - JTAG_SRST_RELEASED, - JTAG_TRST_RELEASED, -}; - -extern char* jtag_event_strings[]; - -extern int jtag_trst; -extern int jtag_srst; - -typedef struct jtag_event_callback_s -{ - int (*callback)(enum jtag_event event, void *priv); - void *priv; - struct jtag_event_callback_s *next; -} jtag_event_callback_t; - -extern jtag_event_callback_t *jtag_event_callbacks; - -extern jtag_interface_t *jtag; /* global pointer to configured JTAG interface */ -extern enum tap_state end_state; -extern enum tap_state cur_state; - -extern char* jtag_interface; -extern int jtag_speed; - -enum reset_types -{ - RESET_NONE = 0x0, - RESET_HAS_TRST = 0x1, - RESET_HAS_SRST = 0x2, - RESET_TRST_AND_SRST = 0x3, - RESET_SRST_PULLS_TRST = 0x4, - RESET_TRST_PULLS_SRST = 0x8, - RESET_TRST_OPEN_DRAIN = 0x10, - RESET_SRST_PUSH_PULL = 0x20, -}; - -extern enum reset_types jtag_reset_config; - -/* JTAG subsystem */ -extern int jtag_init(struct command_context_s *cmd_ctx); -extern int jtag_register_commands(struct command_context_s *cmd_ctx); - -/* JTAG interface, can be implemented with a software or hardware fifo */ +/*************************************************************************** + * Copyright (C) 2005 by Dominic Rath * + * Dominic.Rath@gmx.de * + * * + * 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., * + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * + ***************************************************************************/ +#ifndef JTAG_H +#define JTAG_H + +#include "types.h" +#include "binarybuffer.h" + +#include "command.h" + +#if 0 +#define _DEBUG_JTAG_IO_ +#endif + +/* Tap States + * TLR - Test-Logic-Reset, RTI - Run-Test/Idle, + * SDS - Select-DR-Scan, CD - Capture-DR, SD - Shift-DR, E1D - Exit1-DR, + * PD - Pause-DR, E2D - Exit2-DR, UD - Update-DR, + * SIS - Select-IR-Scan, CI - Capture-IR, SI - Shift-IR, E1I - Exit1-IR, + * PI - Pause-IR, E2I - Exit2-IR, UI - Update-IR + */ +enum tap_state +{ + TAP_TLR = 0x0, TAP_RTI = 0x8, + TAP_SDS = 0x1, TAP_CD = 0x2, TAP_SD = 0x3, TAP_E1D = 0x4, + TAP_PD = 0x5, TAP_E2D = 0x6, TAP_UD = 0x7, + TAP_SIS = 0x9, TAP_CI = 0xa, TAP_SI = 0xb, TAP_E1I = 0xc, + TAP_PI = 0xd, TAP_E2I = 0xe, TAP_UI = 0xf +}; + +typedef struct tap_transition_s +{ + enum tap_state high; + enum tap_state low; +} tap_transition_t; + +extern char* tap_state_strings[16]; +extern int tap_move_map[16]; /* map 16 TAP states to 6 stable states */ +extern u8 tap_move[6][6]; /* value scanned to TMS to move from one of six stable states to another */ +extern tap_transition_t tap_transitions[16]; /* describe the TAP state diagram */ + +extern enum tap_state end_state; /* finish DR scans in dr_end_state */ +extern enum tap_state cur_state; /* current TAP state */ + +extern enum tap_state cmd_queue_end_state; /* finish DR scans in dr_end_state */ +extern enum tap_state cmd_queue_cur_state; /* current TAP state */ + +#define TAP_MOVE(from, to) tap_move[tap_move_map[from]][tap_move_map[to]] + +typedef void * error_handler_t; /* Later on we can delete error_handler_t, but keep it for now to make patches more readable */ + +struct scan_field_s; +typedef int (*in_handler_t)(u8 *in_value, void *priv, struct scan_field_s *field); + +typedef struct scan_field_s +{ + int device; /* ordinal device number this instruction refers to */ + int num_bits; /* number of bits this field specifies (up to 32) */ + u8 *out_value; /* value to be scanned into the device */ + u8 *out_mask; /* only masked bits care */ + u8 *in_value; /* pointer to a 32-bit memory location to take data scanned out */ + /* in_check_value/mask, in_handler_error_handler, in_handler_priv can be used by the in handler, otherwise they contain garbage */ + u8 *in_check_value; /* used to validate scan results */ + u8 *in_check_mask; /* check specified bits against check_value */ + in_handler_t in_handler; /* process received buffer using this handler */ + void *in_handler_priv; /* additional information for the in_handler */ +} scan_field_t; + +enum scan_type +{ + /* IN: from device to host, OUT: from host to device */ + SCAN_IN = 1, SCAN_OUT = 2, SCAN_IO = 3 +}; + +typedef struct scan_command_s +{ + int ir_scan; /* instruction/not data scan */ + int num_fields; /* number of fields in *fields array */ + scan_field_t *fields; /* pointer to an array of data scan fields */ + enum tap_state end_state; /* TAP state in which JTAG commands should finish */ +} scan_command_t; + +typedef struct statemove_command_s +{ + enum tap_state end_state; /* TAP state in which JTAG commands should finish */ +} statemove_command_t; + +typedef struct pathmove_command_s +{ + int num_states; /* number of states in *path */ + enum tap_state *path; /* states that have to be passed */ +} pathmove_command_t; + +typedef struct runtest_command_s +{ + int num_cycles; /* number of cycles that should be spent in Run-Test/Idle */ + enum tap_state end_state; /* TAP state in which JTAG commands should finish */ +} runtest_command_t; + +typedef struct reset_command_s +{ + int trst; /* trst/srst 0: deassert, 1: assert, -1: don't change */ + int srst; +} reset_command_t; + +typedef struct end_state_command_s +{ + enum tap_state end_state; /* TAP state in which JTAG commands should finish */ +} end_state_command_t; + +typedef struct sleep_command_s +{ + u32 us; /* number of microseconds to sleep */ +} sleep_command_t; + +typedef union jtag_command_container_u +{ + scan_command_t *scan; + statemove_command_t *statemove; + pathmove_command_t *pathmove; + runtest_command_t *runtest; + reset_command_t *reset; + end_state_command_t *end_state; + sleep_command_t *sleep; +} jtag_command_container_t; + +enum jtag_command_type +{ + JTAG_SCAN = 1, + JTAG_STATEMOVE = 2, JTAG_RUNTEST = 3, + JTAG_RESET = 4, JTAG_END_STATE = 5, + JTAG_PATHMOVE = 6, JTAG_SLEEP = 7 +}; + +typedef struct jtag_command_s +{ + jtag_command_container_t cmd; + enum jtag_command_type type; + struct jtag_command_s *next; +} jtag_command_t; + +extern jtag_command_t *jtag_command_queue; + +typedef struct jtag_device_s +{ + int ir_length; /* size of instruction register */ + u8 *expected; /* Capture-IR expected value */ + u8 *expected_mask; /* Capture-IR expected mask */ + u32 idcode; /* device identification code */ + u8 *cur_instr; /* current instruction */ + int bypass; /* bypass register selected */ + struct jtag_device_s *next; +} jtag_device_t; + +extern jtag_device_t *jtag_devices; +extern int jtag_num_devices; +extern int jtag_ir_scan_size; + +enum reset_line_mode +{ + LINE_OPEN_DRAIN = 0x0, + LINE_PUSH_PULL = 0x1, +}; + +typedef struct jtag_interface_s +{ + char* name; + + /* queued command execution + */ + int (*execute_queue)(void); + + /* interface initalization + */ + int (*speed)(int speed); + int (*register_commands)(struct command_context_s *cmd_ctx); + int (*init)(void); + int (*quit)(void); + +} jtag_interface_t; + +enum jtag_event +{ + JTAG_SRST_ASSERTED, + JTAG_TRST_ASSERTED, + JTAG_SRST_RELEASED, + JTAG_TRST_RELEASED, +}; + +extern char* jtag_event_strings[]; + +extern int jtag_trst; +extern int jtag_srst; + +typedef struct jtag_event_callback_s +{ + int (*callback)(enum jtag_event event, void *priv); + void *priv; + struct jtag_event_callback_s *next; +} jtag_event_callback_t; + +extern jtag_event_callback_t *jtag_event_callbacks; + +extern jtag_interface_t *jtag; /* global pointer to configured JTAG interface */ +extern enum tap_state end_state; +extern enum tap_state cur_state; + +extern int jtag_speed; + +enum reset_types +{ + RESET_NONE = 0x0, + RESET_HAS_TRST = 0x1, + RESET_HAS_SRST = 0x2, + RESET_TRST_AND_SRST = 0x3, + RESET_SRST_PULLS_TRST = 0x4, + RESET_TRST_PULLS_SRST = 0x8, + RESET_TRST_OPEN_DRAIN = 0x10, + RESET_SRST_PUSH_PULL = 0x20, +}; + +extern enum reset_types jtag_reset_config; + +/* JTAG subsystem */ +extern int jtag_init(struct command_context_s *cmd_ctx); +extern int jtag_register_commands(struct command_context_s *cmd_ctx); + +/* JTAG interface, can be implemented with a software or hardware fifo */ extern int jtag_add_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate); extern int jtag_add_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate); extern int jtag_add_plain_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate); extern int jtag_add_plain_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate); -/* execute a state transition within the JTAG standard, but the exact path - * path that is taken is undefined. Many implementations use precisely - * 7 clocks to perform a transition, but it could be more or less - * than that. - * - * The following assertions are made about certain common state moves: - * - * - A state move from Pause-[ID]R to Pause-[ID]R should always go through - * Update-[ID]R and Capture-[ID]R before returning to Pause-[ID]R, otherwise - * there's no way force a register update, if you can't go to Run-Test/Idle for - * some reason. - * - * - A state move from Pause-[ID]R to Shift-[ID]R must not go through - * Update-[ID]R. - * - * - Run-Test/Idle must not be entered unless requested, because R-T/I may have - * side effects. - */ -extern int jtag_add_statemove(enum tap_state endstate); -/* A list of unambigious single clock state transitions, not - * all drivers can support this, but it is required for e.g. - * XScale and Xilinx support - */ -extern int jtag_add_pathmove(int num_states, enum tap_state *path); -/* cycle precisely num_cycles in the TAP_RTI state */ -extern int jtag_add_runtest(int num_cycles, enum tap_state endstate); -extern int jtag_add_reset(int trst, int srst); -extern int jtag_add_end_state(enum tap_state endstate); -extern int jtag_add_sleep(u32 us); -/* - * For software FIFO implementations, the queued commands can be executed - * during this call or earlier. A sw queue might decide to push out - * some of the jtag_add_xxx() operations once the queue is "big enough". - * - * This fn will return an error code if any of the prior jtag_add_xxx() - * calls caused a failure, e.g. check failure. Note that it does not - * matter if the operation was executed *before* jtag_execute_queue(), - * jtag_execute_queue() will still return an error code. - * - * All jtag_add_xxx() calls that have in_handler!=NULL will have been - * executed when this fn returns, but if what has been queued only - * clocks data out, without reading anything back, then JTAG could - * be running *after* jtag_execute_queue() returns. The API does - * not define a way to flush a hw FIFO that runs *after* - * jtag_execute_queue() returns. - * - * jtag_add_xxx() commands can either be executed immediately or - * at some time between the jtag_add_xxx() fn call and jtag_execute_queue(). - */ -extern int jtag_execute_queue(void); - -/* JTAG support functions */ -extern void jtag_set_check_value(scan_field_t *field, u8 *value, u8 *mask, error_handler_t *in_error_handler); -extern enum scan_type jtag_scan_type(scan_command_t *cmd); -extern int jtag_scan_size(scan_command_t *cmd); -extern int jtag_read_buffer(u8 *buffer, scan_command_t *cmd); -extern int jtag_build_buffer(scan_command_t *cmd, u8 **buffer); -extern jtag_device_t* jtag_get_device(int num); -extern void jtag_sleep(u32 us); -extern int jtag_call_event_callbacks(enum jtag_event event); -extern int jtag_register_event_callback(int (*callback)(enum jtag_event event, void *priv), void *priv); - -extern int jtag_verify_capture_ir; - - -/* error codes - * JTAG subsystem uses codes between -100 and -199 */ - -#define ERROR_JTAG_INIT_FAILED (-100) -#define ERROR_JTAG_INVALID_INTERFACE (-101) -#define ERROR_JTAG_NOT_IMPLEMENTED (-102) -#define ERROR_JTAG_TRST_ASSERTED (-103) -#define ERROR_JTAG_QUEUE_FAILED (-104) -#define ERROR_JTAG_RESET_WOULD_ASSERT_TRST (-105) -#define ERROR_JTAG_RESET_CANT_SRST (-106) -#define ERROR_JTAG_DEVICE_ERROR (-107) -#endif /* JTAG_H */ +/* execute a state transition within the JTAG standard, but the exact path + * path that is taken is undefined. Many implementations use precisely + * 7 clocks to perform a transition, but it could be more or less + * than that. + * + * The following assertions are made about certain common state moves: + * + * - A state move from Pause-[ID]R to Pause-[ID]R should always go through + * Update-[ID]R and Capture-[ID]R before returning to Pause-[ID]R, otherwise + * there's no way force a register update, if you can't go to Run-Test/Idle for + * some reason. + * + * - A state move from Pause-[ID]R to Shift-[ID]R must not go through + * Update-[ID]R. + * + * - Run-Test/Idle must not be entered unless requested, because R-T/I may have + * side effects. + */ +extern int jtag_add_statemove(enum tap_state endstate); +/* A list of unambigious single clock state transitions, not + * all drivers can support this, but it is required for e.g. + * XScale and Xilinx support + */ +extern int jtag_add_pathmove(int num_states, enum tap_state *path); +/* cycle precisely num_cycles in the TAP_RTI state */ +extern int jtag_add_runtest(int num_cycles, enum tap_state endstate); +extern int jtag_add_reset(int trst, int srst); +extern int jtag_add_end_state(enum tap_state endstate); +extern int jtag_add_sleep(u32 us); +/* + * For software FIFO implementations, the queued commands can be executed + * during this call or earlier. A sw queue might decide to push out + * some of the jtag_add_xxx() operations once the queue is "big enough". + * + * This fn will return an error code if any of the prior jtag_add_xxx() + * calls caused a failure, e.g. check failure. Note that it does not + * matter if the operation was executed *before* jtag_execute_queue(), + * jtag_execute_queue() will still return an error code. + * + * All jtag_add_xxx() calls that have in_handler!=NULL will have been + * executed when this fn returns, but if what has been queued only + * clocks data out, without reading anything back, then JTAG could + * be running *after* jtag_execute_queue() returns. The API does + * not define a way to flush a hw FIFO that runs *after* + * jtag_execute_queue() returns. + * + * jtag_add_xxx() commands can either be executed immediately or + * at some time between the jtag_add_xxx() fn call and jtag_execute_queue(). + */ +extern int jtag_execute_queue(void); + +/* JTAG support functions */ +extern void jtag_set_check_value(scan_field_t *field, u8 *value, u8 *mask, error_handler_t *in_error_handler); +extern enum scan_type jtag_scan_type(scan_command_t *cmd); +extern int jtag_scan_size(scan_command_t *cmd); +extern int jtag_read_buffer(u8 *buffer, scan_command_t *cmd); +extern int jtag_build_buffer(scan_command_t *cmd, u8 **buffer); +extern jtag_device_t* jtag_get_device(int num); +extern void jtag_sleep(u32 us); +extern int jtag_call_event_callbacks(enum jtag_event event); +extern int jtag_register_event_callback(int (*callback)(enum jtag_event event, void *priv), void *priv); + +extern int jtag_verify_capture_ir; + + +/* error codes + * JTAG subsystem uses codes between -100 and -199 */ + +#define ERROR_JTAG_INIT_FAILED (-100) +#define ERROR_JTAG_INVALID_INTERFACE (-101) +#define ERROR_JTAG_NOT_IMPLEMENTED (-102) +#define ERROR_JTAG_TRST_ASSERTED (-103) +#define ERROR_JTAG_QUEUE_FAILED (-104) +#define ERROR_JTAG_RESET_WOULD_ASSERT_TRST (-105) +#define ERROR_JTAG_RESET_CANT_SRST (-106) +#define ERROR_JTAG_DEVICE_ERROR (-107) +#endif /* JTAG_H */