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/***********************license start***************
 * Copyright (c) 2003-2010  Cavium Networks (support@cavium.com). All rights
 * reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.

 *   * Neither the name of Cavium Networks nor the names of
 *     its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written
 *     permission.

 * This Software, including technical data, may be subject to U.S. export  control
 * laws, including the U.S. Export Administration Act and its  associated
 * regulations, and may be subject to export or import  regulations in other
 * countries.

 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
 * AND WITH ALL FAULTS AND CAVIUM  NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR
 * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
 * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR
 * DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
 * SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
 * MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
 * VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
 * CORRESPONDENCE TO DESCRIPTION. THE ENTIRE  RISK ARISING OUT OF USE OR
 * PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
 ***********************license end**************************************/


/**
 * @file
 *
 * Interface to the hardware Packet Order / Work unit.
 *
 * New, starting with SDK 1.7.0, cvmx-pow supports a number of
 * extended consistency checks. The define
 * CVMX_ENABLE_POW_CHECKS controls the runtime insertion of POW
 * internal state checks to find common programming errors. If
 * CVMX_ENABLE_POW_CHECKS is not defined, checks are by default
 * enabled. For example, cvmx-pow will check for the following
 * program errors or POW state inconsistency.
 * - Requesting a POW operation with an active tag switch in
 *   progress.
 * - Waiting for a tag switch to complete for an excessively
 *   long period. This is normally a sign of an error in locking
 *   causing deadlock.
 * - Illegal tag switches from NULL_NULL.
 * - Illegal tag switches from NULL.
 * - Illegal deschedule request.
 * - WQE pointer not matching the one attached to the core by
 *   the POW.
 *
 * <hr>$Revision: 49448 $<hr>
 */

#ifndef __CVMX_POW_H__
#define __CVMX_POW_H__

#include "cvmx-scratch.h"
#include "cvmx-wqe.h"

#ifndef CVMX_BUILD_FOR_LINUX_KERNEL
#include "cvmx-warn.h"
#endif

#ifdef	__cplusplus
extern "C" {
#endif

/* Default to having all POW constancy checks turned on */
#ifndef CVMX_ENABLE_POW_CHECKS
#define CVMX_ENABLE_POW_CHECKS 1
#endif

/**
 * Wait flag values for pow functions.
 */
typedef enum
{
    CVMX_POW_WAIT = 1,
    CVMX_POW_NO_WAIT = 0,
} cvmx_pow_wait_t;

/**
 *  POW tag operations.  These are used in the data stored to the POW.
 */
typedef enum
{
    CVMX_POW_TAG_OP_SWTAG = 0L,         /**< switch the tag (only) for this PP
                                            - the previous tag should be non-NULL in this case
                                            - tag switch response required
                                            - fields used: op, type, tag */
    CVMX_POW_TAG_OP_SWTAG_FULL = 1L,    /**< switch the tag for this PP, with full information
                                            - this should be used when the previous tag is NULL
                                            - tag switch response required
                                            - fields used: address, op, grp, type, tag */
    CVMX_POW_TAG_OP_SWTAG_DESCH = 2L,   /**< switch the tag (and/or group) for this PP and de-schedule
                                            - OK to keep the tag the same and only change the group
                                            - fields used: op, no_sched, grp, type, tag */
    CVMX_POW_TAG_OP_DESCH = 3L,         /**< just de-schedule
                                            - fields used: op, no_sched */
    CVMX_POW_TAG_OP_ADDWQ = 4L,         /**< create an entirely new work queue entry
                                            - fields used: address, op, qos, grp, type, tag */
    CVMX_POW_TAG_OP_UPDATE_WQP_GRP = 5L,/**< just update the work queue pointer and grp for this PP
                                            - fields used: address, op, grp */
    CVMX_POW_TAG_OP_SET_NSCHED = 6L,    /**< set the no_sched bit on the de-schedule list
                                            - does nothing if the selected entry is not on the de-schedule list
                                            - does nothing if the stored work queue pointer does not match the address field
                                            - fields used: address, index, op
                                            Before issuing a *_NSCHED operation, SW must guarantee that all
                                            prior deschedules and set/clr NSCHED operations are complete and all
                                            prior switches are complete. The hardware provides the opsdone bit
                                            and swdone bit for SW polling. After issuing a *_NSCHED operation,
                                            SW must guarantee that the set/clr NSCHED is complete before
                                            any subsequent operations. */
    CVMX_POW_TAG_OP_CLR_NSCHED = 7L,    /**< clears the no_sched bit on the de-schedule list
                                            - does nothing if the selected entry is not on the de-schedule list
                                            - does nothing if the stored work queue pointer does not match the address field
                                            - fields used: address, index, op
                                            Before issuing a *_NSCHED operation, SW must guarantee that all
                                            prior deschedules and set/clr NSCHED operations are complete and all
                                            prior switches are complete. The hardware provides the opsdone bit
                                            and swdone bit for SW polling. After issuing a *_NSCHED operation,
                                            SW must guarantee that the set/clr NSCHED is complete before
                                            any subsequent operations. */
    CVMX_POW_TAG_OP_NOP = 15L           /**< do nothing */
} cvmx_pow_tag_op_t;

/**
 * This structure defines the store data on a store to POW
 */
typedef union
{
    uint64_t u64;
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t              no_sched  : 1; /**< don't reschedule this entry. no_sched is used for CVMX_POW_TAG_OP_SWTAG_DESCH and CVMX_POW_TAG_OP_DESCH */
        uint64_t                unused  : 2;
        uint64_t                 index  :13; /**< contains index of entry for a CVMX_POW_TAG_OP_*_NSCHED */
        cvmx_pow_tag_op_t          op   : 4; /**< the operation to perform */
        uint64_t                unused2 : 2;
        uint64_t                   qos  : 3; /**< the QOS level for the packet. qos is only used for CVMX_POW_TAG_OP_ADDWQ */
        uint64_t                   grp  : 4; /**< the group that the work queue entry will be scheduled to grp is used for CVMX_POW_TAG_OP_ADDWQ, CVMX_POW_TAG_OP_SWTAG_FULL, CVMX_POW_TAG_OP_SWTAG_DESCH, and CVMX_POW_TAG_OP_UPDATE_WQP_GRP */
        cvmx_pow_tag_type_t        type : 3; /**< the type of the tag. type is used for everything except CVMX_POW_TAG_OP_DESCH, CVMX_POW_TAG_OP_UPDATE_WQP_GRP, and CVMX_POW_TAG_OP_*_NSCHED */
        uint64_t                   tag  :32; /**< the actual tag. tag is used for everything except CVMX_POW_TAG_OP_DESCH, CVMX_POW_TAG_OP_UPDATE_WQP_GRP, and CVMX_POW_TAG_OP_*_NSCHED */
#else
        uint64_t                   tag  :32;
        cvmx_pow_tag_type_t        type : 3;
        uint64_t                   grp  : 4;
        uint64_t                   qos  : 3;
        uint64_t                unused2 : 2;
        cvmx_pow_tag_op_t          op   : 4;
        uint64_t                 index  :13;
        uint64_t                unused  : 2;
        uint64_t              no_sched  : 1;
#endif
    } s;
} cvmx_pow_tag_req_t;

/**
 * This structure describes the address to load stuff from POW
 */
typedef union
{
    uint64_t u64;

    /**
     * Address for new work request loads (did<2:0> == 0)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    mem_region      : 2;    /**< Mips64 address region. Should be CVMX_IO_SEG */
        uint64_t    reserved_49_61  : 13;   /**< Must be zero */
        uint64_t    is_io           : 1;    /**< Must be one */
        uint64_t    did             : 8;    /**< the ID of POW -- did<2:0> == 0 in this case */
        uint64_t    reserved_4_39   : 36;   /**< Must be zero */
        uint64_t    wait            : 1;    /**< If set, don't return load response until work is available */
        uint64_t    reserved_0_2    : 3;    /**< Must be zero */
#else
        uint64_t    reserved_0_2    : 3;
        uint64_t    wait            : 1;
        uint64_t    reserved_4_39   : 36;
        uint64_t    did             : 8;
        uint64_t    is_io           : 1;
        uint64_t    reserved_49_61  : 13;
        uint64_t    mem_region      : 2;
#endif
    } swork;

    /**
     * Address for loads to get POW internal status
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    mem_region      : 2;    /**< Mips64 address region. Should be CVMX_IO_SEG */
        uint64_t    reserved_49_61  : 13;   /**< Must be zero */
        uint64_t    is_io           : 1;    /**< Must be one */
        uint64_t    did             : 8;    /**< the ID of POW -- did<2:0> == 1 in this case */
        uint64_t    reserved_10_39  : 30;   /**< Must be zero */
        uint64_t    coreid          : 4;    /**< The core id to get status for */
        uint64_t    get_rev         : 1;    /**< If set and get_cur is set, return reverse tag-list pointer rather than forward tag-list pointer */
        uint64_t    get_cur         : 1;    /**< If set, return current status rather than pending status */
        uint64_t    get_wqp         : 1;    /**< If set, get the work-queue pointer rather than tag/type */
        uint64_t    reserved_0_2    : 3;    /**< Must be zero */
#else
        uint64_t    reserved_0_2    : 3;
        uint64_t    get_wqp         : 1;
        uint64_t    get_cur         : 1;
        uint64_t    get_rev         : 1;
        uint64_t    coreid          : 4;
        uint64_t    reserved_10_39  : 30;
        uint64_t    did             : 8;
        uint64_t    is_io           : 1;
        uint64_t    reserved_49_61  : 13;
        uint64_t    mem_region      : 2;
#endif
    } sstatus;

    /**
     * Address for memory loads to get POW internal state
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    mem_region      : 2;    /**< Mips64 address region. Should be CVMX_IO_SEG */
        uint64_t    reserved_49_61  : 13;   /**< Must be zero */
        uint64_t    is_io           : 1;    /**< Must be one */
        uint64_t    did             : 8;    /**< the ID of POW -- did<2:0> == 2 in this case */
        uint64_t    reserved_16_39  : 24;   /**< Must be zero */
        uint64_t    index           : 11;   /**< POW memory index */
        uint64_t    get_des         : 1;    /**< If set, return deschedule information rather than the standard
                                                response for work-queue index (invalid if the work-queue entry is not on the
                                                deschedule list). */
        uint64_t    get_wqp         : 1;    /**< If set, get the work-queue pointer rather than tag/type (no effect when get_des set). */
        uint64_t    reserved_0_2    : 3;    /**< Must be zero */
#else
        uint64_t    reserved_0_2    : 3;
        uint64_t    get_wqp         : 1;
        uint64_t    get_des         : 1;
        uint64_t    index           : 11;
        uint64_t    reserved_16_39  : 24;
        uint64_t    did             : 8;
        uint64_t    is_io           : 1;
        uint64_t    reserved_49_61  : 13;
        uint64_t    mem_region      : 2;
#endif
    } smemload;

    /**
     * Address for index/pointer loads
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    mem_region      : 2;    /**< Mips64 address region. Should be CVMX_IO_SEG */
        uint64_t    reserved_49_61  : 13;   /**< Must be zero */
        uint64_t    is_io           : 1;    /**< Must be one */
        uint64_t    did             : 8;    /**< the ID of POW -- did<2:0> == 3 in this case */
        uint64_t    reserved_9_39   : 31;   /**< Must be zero */
        uint64_t    qosgrp          : 4;    /**< when {get_rmt ==0 AND get_des_get_tail == 0}, this field selects one of
                                                eight POW internal-input queues (0-7), one per QOS level; values 8-15 are
                                                illegal in this case;
                                                when {get_rmt ==0 AND get_des_get_tail == 1}, this field selects one of
                                                16 deschedule lists (per group);
                                                when get_rmt ==1, this field selects one of 16 memory-input queue lists.
                                                The two memory-input queue lists associated with each QOS level are:
                                                - qosgrp = 0, qosgrp = 8:      QOS0
                                                - qosgrp = 1, qosgrp = 9:      QOS1
                                                - qosgrp = 2, qosgrp = 10:     QOS2
                                                - qosgrp = 3, qosgrp = 11:     QOS3
                                                - qosgrp = 4, qosgrp = 12:     QOS4
                                                - qosgrp = 5, qosgrp = 13:     QOS5
                                                - qosgrp = 6, qosgrp = 14:     QOS6
                                                - qosgrp = 7, qosgrp = 15:     QOS7 */
        uint64_t    get_des_get_tail: 1;    /**< If set and get_rmt is clear, return deschedule list indexes
                                                rather than indexes for the specified qos level; if set and get_rmt is set, return
                                                the tail pointer rather than the head pointer for the specified qos level. */
        uint64_t    get_rmt         : 1;    /**< If set, return remote pointers rather than the local indexes for the specified qos level. */
        uint64_t    reserved_0_2    : 3;    /**< Must be zero */
#else
        uint64_t    reserved_0_2    : 3;
        uint64_t    get_rmt         : 1;
        uint64_t    get_des_get_tail: 1;
        uint64_t    qosgrp          : 4;
        uint64_t    reserved_9_39   : 31;
        uint64_t    did             : 8;
        uint64_t    is_io           : 1;
        uint64_t    reserved_49_61  : 13;
        uint64_t    mem_region      : 2;
#endif
    } sindexload;

    /**
     * address for NULL_RD request (did<2:0> == 4)
     * when this is read, HW attempts to change the state to NULL if it is NULL_NULL
     * (the hardware cannot switch from NULL_NULL to NULL if a POW entry is not available -
     * software may need to recover by finishing another piece of work before a POW
     * entry can ever become available.)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    mem_region      : 2;    /**< Mips64 address region. Should be CVMX_IO_SEG */
        uint64_t    reserved_49_61  : 13;   /**< Must be zero */
        uint64_t    is_io           : 1;    /**< Must be one */
        uint64_t    did             : 8;    /**< the ID of POW -- did<2:0> == 4 in this case */
        uint64_t    reserved_0_39   : 40;   /**< Must be zero */
#else
        uint64_t    reserved_0_39   : 40;
        uint64_t    did             : 8;
        uint64_t    is_io           : 1;
        uint64_t    reserved_49_61  : 13;
        uint64_t    mem_region      : 2;
#endif
    } snull_rd;
} cvmx_pow_load_addr_t;

/**
 * This structure defines the response to a load/SENDSINGLE to POW (except CSR reads)
 */
typedef union
{
    uint64_t u64;

    /**
     * Response to new work request loads
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    no_work          : 1;   /**< Set when no new work queue entry was returned.
                                                If there was de-scheduled work, the HW will definitely
                                                return it. When this bit is set, it could mean
                                                either mean:
                                                - There was no work, or
                                                - There was no work that the HW could find. This
                                                    case can happen, regardless of the wait bit value
                                                    in the original request, when there is work
                                                    in the IQ's that is too deep down the list. */
        uint64_t    reserved_40_62   : 23;  /**< Must be zero */
        uint64_t    addr             : 40;  /**< 36 in O1 -- the work queue pointer */
#else
        uint64_t    addr             : 40;
        uint64_t    reserved_40_62   : 23;
        uint64_t    no_work          : 1;
#endif
    } s_work;

    /**
     * Result for a POW Status Load (when get_cur==0 and get_wqp==0)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_62_63  : 2;
        uint64_t    pend_switch     : 1;    /**< Set when there is a pending non-NULL SWTAG or
                                                SWTAG_FULL, and the POW entry has not left the list for the original tag. */
        uint64_t    pend_switch_full: 1;    /**< Set when SWTAG_FULL and pend_switch is set. */
        uint64_t    pend_switch_null: 1;    /**< Set when there is a pending NULL SWTAG, or an implicit switch to NULL. */
        uint64_t    pend_desched    : 1;    /**< Set when there is a pending DESCHED or SWTAG_DESCHED. */
        uint64_t    pend_desched_switch: 1; /**< Set when there is a pending SWTAG_DESCHED and pend_desched is set. */
        uint64_t    pend_nosched    : 1;    /**< Set when nosched is desired and pend_desched is set. */
        uint64_t    pend_new_work   : 1;    /**< Set when there is a pending GET_WORK. */
        uint64_t    pend_new_work_wait: 1;  /**< When pend_new_work is set, this bit indicates that the wait bit was set. */
        uint64_t    pend_null_rd    : 1;    /**< Set when there is a pending NULL_RD. */
        uint64_t    pend_nosched_clr: 1;    /**< Set when there is a pending CLR_NSCHED. */
        uint64_t    reserved_51     : 1;
        uint64_t    pend_index      : 11;   /**< This is the index when pend_nosched_clr is set. */
        uint64_t    pend_grp        : 4;    /**< This is the new_grp when (pend_desched AND pend_desched_switch) is set. */
        uint64_t    reserved_34_35  : 2;
        uint64_t    pend_type       : 2;    /**< This is the tag type when pend_switch or (pend_desched AND pend_desched_switch) are set. */
        uint64_t    pend_tag        : 32;   /**< - this is the tag when pend_switch or (pend_desched AND pend_desched_switch) are set. */
#else
        uint64_t    pend_tag        : 32;
        uint64_t    pend_type       : 2;
        uint64_t    reserved_34_35  : 2;
        uint64_t    pend_grp        : 4;
        uint64_t    pend_index      : 11;
        uint64_t    reserved_51     : 1;
        uint64_t    pend_nosched_clr: 1;
        uint64_t    pend_null_rd    : 1;
        uint64_t    pend_new_work_wait: 1;
        uint64_t    pend_new_work   : 1;
        uint64_t    pend_nosched    : 1;
        uint64_t    pend_desched_switch: 1;
        uint64_t    pend_desched    : 1;
        uint64_t    pend_switch_null: 1;
        uint64_t    pend_switch_full: 1;
        uint64_t    pend_switch     : 1;
        uint64_t    reserved_62_63  : 2;
#endif
    } s_sstatus0;

    /**
     * Result for a POW Status Load (when get_cur==0 and get_wqp==1)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_62_63  : 2;
        uint64_t    pend_switch     : 1;    /**< Set when there is a pending non-NULL SWTAG or
                                                SWTAG_FULL, and the POW entry has not left the list for the original tag. */
        uint64_t    pend_switch_full: 1;    /**< Set when SWTAG_FULL and pend_switch is set. */
        uint64_t    pend_switch_null: 1;    /**< Set when there is a pending NULL SWTAG, or an implicit switch to NULL. */
        uint64_t    pend_desched    : 1;    /**< Set when there is a pending DESCHED or SWTAG_DESCHED. */
        uint64_t    pend_desched_switch: 1; /**< Set when there is a pending SWTAG_DESCHED and pend_desched is set. */
        uint64_t    pend_nosched    : 1;    /**< Set when nosched is desired and pend_desched is set. */
        uint64_t    pend_new_work   : 1;    /**< Set when there is a pending GET_WORK. */
        uint64_t    pend_new_work_wait: 1;  /**< When pend_new_work is set, this bit indicates that the wait bit was set. */
        uint64_t    pend_null_rd    : 1;    /**< Set when there is a pending NULL_RD. */
        uint64_t    pend_nosched_clr: 1;    /**< Set when there is a pending CLR_NSCHED. */
        uint64_t    reserved_51     : 1;
        uint64_t    pend_index      : 11;   /**< This is the index when pend_nosched_clr is set. */
        uint64_t    pend_grp        : 4;    /**< This is the new_grp when (pend_desched AND pend_desched_switch) is set. */
        uint64_t    pend_wqp        : 36;   /**< This is the wqp when pend_nosched_clr is set. */
#else
        uint64_t    pend_wqp        : 36;
        uint64_t    pend_grp        : 4;
        uint64_t    pend_index      : 11;
        uint64_t    reserved_51     : 1;
        uint64_t    pend_nosched_clr: 1;
        uint64_t    pend_null_rd    : 1;
        uint64_t    pend_new_work_wait: 1;
        uint64_t    pend_new_work   : 1;
        uint64_t    pend_nosched    : 1;
        uint64_t    pend_desched_switch: 1;
        uint64_t    pend_desched    : 1;
        uint64_t    pend_switch_null: 1;
        uint64_t    pend_switch_full: 1;
        uint64_t    pend_switch     : 1;
        uint64_t    reserved_62_63  : 2;
#endif
    } s_sstatus1;

    /**
     * Result for a POW Status Load (when get_cur==1, get_wqp==0, and get_rev==0)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_62_63  : 2;
        uint64_t    link_index      : 11;    /**< Points to the next POW entry in the tag list when tail == 0 (and
                                                tag_type is not NULL or NULL_NULL). */
        uint64_t    index           : 11;   /**< The POW entry attached to the core. */
        uint64_t    grp             : 4;    /**< The group attached to the core (updated when new tag list entered on SWTAG_FULL). */
        uint64_t    head            : 1;    /**< Set when this POW entry is at the head of its tag list (also set when in
                                                the NULL or NULL_NULL state). */
        uint64_t    tail            : 1;    /**< Set when this POW entry is at the tail of its tag list (also set when in the
                                                NULL or NULL_NULL state). */
        uint64_t    tag_type        : 2;    /**< The tag type attached to the core (updated when new tag list
                                                entered on SWTAG, SWTAG_FULL, or SWTAG_DESCHED). */
        uint64_t    tag             : 32;   /**< The tag attached to the core (updated when new tag list entered on
                                                SWTAG, SWTAG_FULL, or SWTAG_DESCHED). */
#else
        uint64_t    tag             : 32;
        uint64_t    tag_type        : 2;
        uint64_t    tail            : 1;
        uint64_t    head            : 1;
        uint64_t    grp             : 4;
        uint64_t    index           : 11;
        uint64_t    link_index      : 11;
        uint64_t    reserved_62_63  : 2;
#endif
    } s_sstatus2;

    /**
     * Result for a POW Status Load (when get_cur==1, get_wqp==0, and get_rev==1)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_62_63  : 2;
        uint64_t    revlink_index   : 11;   /**< Points to the prior POW entry in the tag list when head == 0
                                                (and tag_type is not NULL or NULL_NULL). This field is unpredictable
                                                when the core's state is NULL or NULL_NULL. */
        uint64_t    index           : 11;   /**< The POW entry attached to the core. */
        uint64_t    grp             : 4;    /**< The group attached to the core (updated when new tag list entered on SWTAG_FULL). */
        uint64_t    head            : 1;    /**< Set when this POW entry is at the head of its tag list (also set when in
                                                the NULL or NULL_NULL state). */
        uint64_t    tail            : 1;    /**< Set when this POW entry is at the tail of its tag list (also set when in the
                                                NULL or NULL_NULL state). */
        uint64_t    tag_type        : 2;    /**< The tag type attached to the core (updated when new tag list
                                                entered on SWTAG, SWTAG_FULL, or SWTAG_DESCHED). */
        uint64_t    tag             : 32;   /**< The tag attached to the core (updated when new tag list entered on
                                                SWTAG, SWTAG_FULL, or SWTAG_DESCHED). */
#else
        uint64_t    tag             : 32;
        uint64_t    tag_type        : 2;
        uint64_t    tail            : 1;
        uint64_t    head            : 1;
        uint64_t    grp             : 4;
        uint64_t    index           : 11;
        uint64_t    revlink_index   : 11;
        uint64_t    reserved_62_63  : 2;
#endif
    } s_sstatus3;

    /**
     * Result for a POW Status Load (when get_cur==1, get_wqp==1, and get_rev==0)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_62_63  : 2;
        uint64_t    link_index      : 11;    /**< Points to the next POW entry in the tag list when tail == 0 (and
                                                tag_type is not NULL or NULL_NULL). */
        uint64_t    index           : 11;   /**< The POW entry attached to the core. */
        uint64_t    grp             : 4;    /**< The group attached to the core (updated when new tag list entered on SWTAG_FULL). */
        uint64_t    wqp             : 36;   /**< The wqp attached to the core (updated when new tag list entered on SWTAG_FULL). */
#else
        uint64_t    wqp             : 36;
        uint64_t    grp             : 4;
        uint64_t    index           : 11;
        uint64_t    link_index      : 11;
        uint64_t    reserved_62_63  : 2;
#endif
    } s_sstatus4;

    /**
     * Result for a POW Status Load (when get_cur==1, get_wqp==1, and get_rev==1)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_62_63  : 2;
        uint64_t    revlink_index   : 11;   /**< Points to the prior POW entry in the tag list when head == 0
                                                (and tag_type is not NULL or NULL_NULL). This field is unpredictable
                                                when the core's state is NULL or NULL_NULL. */
        uint64_t    index           : 11;   /**< The POW entry attached to the core. */
        uint64_t    grp             : 4;    /**< The group attached to the core (updated when new tag list entered on SWTAG_FULL). */
        uint64_t    wqp             : 36;   /**< The wqp attached to the core (updated when new tag list entered on SWTAG_FULL). */
#else
        uint64_t    wqp             : 36;
        uint64_t    grp             : 4;
        uint64_t    index           : 11;
        uint64_t    revlink_index   : 11;
        uint64_t    reserved_62_63  : 2;
#endif
    } s_sstatus5;

    /**
     * Result For POW Memory Load (get_des == 0 and get_wqp == 0)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_51_63  : 13;
        uint64_t    next_index      : 11;    /**< The next entry in the input, free, descheduled_head list
                                                (unpredictable if entry is the tail of the list). */
        uint64_t    grp             : 4;    /**< The group of the POW entry. */
        uint64_t    reserved_35     : 1;
        uint64_t    tail            : 1;    /**< Set when this POW entry is at the tail of its tag list (also set when in the
                                                NULL or NULL_NULL state). */
        uint64_t    tag_type        : 2;    /**< The tag type of the POW entry. */
        uint64_t    tag             : 32;   /**< The tag of the POW entry. */
#else
        uint64_t    tag             : 32;
        uint64_t    tag_type        : 2;
        uint64_t    tail            : 1;
        uint64_t    reserved_35     : 1;
        uint64_t    grp             : 4;
        uint64_t    next_index      : 11;
        uint64_t    reserved_51_63  : 13;
#endif
    } s_smemload0;

    /**
     * Result For POW Memory Load (get_des == 0 and get_wqp == 1)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_51_63  : 13;
        uint64_t    next_index      : 11;    /**< The next entry in the input, free, descheduled_head list
                                                (unpredictable if entry is the tail of the list). */
        uint64_t    grp             : 4;    /**< The group of the POW entry. */
        uint64_t    wqp             : 36;   /**< The WQP held in the POW entry. */
#else
        uint64_t    wqp             : 36;
        uint64_t    grp             : 4;
        uint64_t    next_index      : 11;
        uint64_t    reserved_51_63  : 13;
#endif
    } s_smemload1;

    /**
     * Result For POW Memory Load (get_des == 1)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_51_63  : 13;
        uint64_t    fwd_index       : 11;   /**< The next entry in the tag list connected to the descheduled head. */
        uint64_t    grp             : 4;    /**< The group of the POW entry. */
        uint64_t    nosched         : 1;    /**< The nosched bit for the POW entry. */
        uint64_t    pend_switch     : 1;    /**< There is a pending tag switch */
        uint64_t    pend_type       : 2;    /**< The next tag type for the new tag list when pend_switch is set. */
        uint64_t    pend_tag        : 32;   /**< The next tag for the new tag list when pend_switch is set. */
#else
        uint64_t    pend_tag        : 32;
        uint64_t    pend_type       : 2;
        uint64_t    pend_switch     : 1;
        uint64_t    nosched         : 1;
        uint64_t    grp             : 4;
        uint64_t    fwd_index       : 11;
        uint64_t    reserved_51_63  : 13;
#endif
    } s_smemload2;

    /**
     * Result For POW Index/Pointer Load (get_rmt == 0/get_des_get_tail == 0)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_52_63  : 12;
        uint64_t    free_val        : 1;    /**< - set when there is one or more POW entries on the free list. */
        uint64_t    free_one        : 1;    /**< - set when there is exactly one POW entry on the free list. */
        uint64_t    reserved_49     : 1;
        uint64_t    free_head       : 11;   /**< - when free_val is set, indicates the first entry on the free list. */
        uint64_t    reserved_37     : 1;
        uint64_t    free_tail       : 11;   /**< - when free_val is set, indicates the last entry on the free list. */
        uint64_t    loc_val         : 1;    /**< - set when there is one or more POW entries on the input Q list selected by qosgrp. */
        uint64_t    loc_one         : 1;    /**< - set when there is exactly one POW entry on the input Q list selected by qosgrp. */
        uint64_t    reserved_23     : 1;
        uint64_t    loc_head        : 11;   /**< - when loc_val is set, indicates the first entry on the input Q list selected by qosgrp. */
        uint64_t    reserved_11     : 1;
        uint64_t    loc_tail        : 11;   /**< - when loc_val is set, indicates the last entry on the input Q list selected by qosgrp. */
#else
        uint64_t    loc_tail        : 11;
        uint64_t    reserved_11     : 1;
        uint64_t    loc_head        : 11;
        uint64_t    reserved_23     : 1;
        uint64_t    loc_one         : 1;
        uint64_t    loc_val         : 1;
        uint64_t    free_tail       : 11;
        uint64_t    reserved_37     : 1;
        uint64_t    free_head       : 11;
        uint64_t    reserved_49     : 1;
        uint64_t    free_one        : 1;
        uint64_t    free_val        : 1;
        uint64_t    reserved_52_63  : 12;
#endif
    } sindexload0;

    /**
     * Result For POW Index/Pointer Load (get_rmt == 0/get_des_get_tail == 1)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_52_63  : 12;
        uint64_t    nosched_val     : 1;    /**< - set when there is one or more POW entries on the nosched list. */
        uint64_t    nosched_one     : 1;    /**< - set when there is exactly one POW entry on the nosched list. */
        uint64_t    reserved_49     : 1;
        uint64_t    nosched_head    : 11;    /**< - when nosched_val is set, indicates the first entry on the nosched list. */
        uint64_t    reserved_37     : 1;
        uint64_t    nosched_tail    : 11;    /**< - when nosched_val is set, indicates the last entry on the nosched list. */
        uint64_t    des_val         : 1;    /**< - set when there is one or more descheduled heads on the descheduled list selected by qosgrp. */
        uint64_t    des_one         : 1;    /**< - set when there is exactly one descheduled head on the descheduled list selected by qosgrp. */
        uint64_t    reserved_23     : 1;
        uint64_t    des_head        : 11;    /**< - when des_val is set, indicates the first descheduled head on the descheduled list selected by qosgrp. */
        uint64_t    reserved_11     : 1;
        uint64_t    des_tail        : 11;    /**< - when des_val is set, indicates the last descheduled head on the descheduled list selected by qosgrp. */
#else
        uint64_t    des_tail        : 11;
        uint64_t    reserved_11     : 1;
        uint64_t    des_head        : 11;
        uint64_t    reserved_23     : 1;
        uint64_t    des_one         : 1;
        uint64_t    des_val         : 1;
        uint64_t    nosched_tail    : 11;
        uint64_t    reserved_37     : 1;
        uint64_t    nosched_head    : 11;
        uint64_t    reserved_49     : 1;
        uint64_t    nosched_one     : 1;
        uint64_t    nosched_val     : 1;
        uint64_t    reserved_52_63  : 12;
#endif
    } sindexload1;

    /**
     * Result For POW Index/Pointer Load (get_rmt == 1/get_des_get_tail == 0)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_39_63  : 25;
        uint64_t    rmt_is_head     : 1;    /**< Set when this DRAM list is the current head (i.e. is the next to
                                                be reloaded when the POW hardware reloads a POW entry from DRAM). The
                                                POW hardware alternates between the two DRAM lists associated with a QOS
                                                level when it reloads work from DRAM into the POW unit. */
        uint64_t    rmt_val         : 1;    /**< Set when the DRAM portion of the input Q list selected by qosgrp
                                                contains one or more pieces of work. */
        uint64_t    rmt_one         : 1;    /**< Set when the DRAM portion of the input Q list selected by qosgrp
                                                contains exactly one piece of work. */
        uint64_t    rmt_head        : 36;   /**< When rmt_val is set, indicates the first piece of work on the
                                                DRAM input Q list selected by qosgrp. */
#else
        uint64_t    rmt_head        : 36;
        uint64_t    rmt_one         : 1;
        uint64_t    rmt_val         : 1;
        uint64_t    rmt_is_head     : 1;
        uint64_t    reserved_39_63  : 25;
#endif
    } sindexload2;

    /**
     * Result For POW Index/Pointer Load (get_rmt == 1/get_des_get_tail == 1)
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    reserved_39_63  : 25;
        uint64_t    rmt_is_head     : 1;    /**< - set when this DRAM list is the current head (i.e. is the next to
                                                be reloaded when the POW hardware reloads a POW entry from DRAM). The
                                                POW hardware alternates between the two DRAM lists associated with a QOS
                                                level when it reloads work from DRAM into the POW unit. */
        uint64_t    rmt_val         : 1;    /**< - set when the DRAM portion of the input Q list selected by qosgrp
                                                contains one or more pieces of work. */
        uint64_t    rmt_one         : 1;    /**< - set when the DRAM portion of the input Q list selected by qosgrp
                                                contains exactly one piece of work. */
        uint64_t    rmt_tail        : 36;   /**< - when rmt_val is set, indicates the last piece of work on the DRAM
                                                input Q list selected by qosgrp. */
#else
        uint64_t    rmt_tail        : 36;
        uint64_t    rmt_one         : 1;
        uint64_t    rmt_val         : 1;
        uint64_t    rmt_is_head     : 1;
        uint64_t    reserved_39_63  : 25;
#endif
    } sindexload3;

    /**
     * Response to NULL_RD request loads
     */
    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    unused  : 62;
        uint64_t    state    : 2;  /**< of type cvmx_pow_tag_type_t. state is one of the following:
                                        - CVMX_POW_TAG_TYPE_ORDERED
                                        - CVMX_POW_TAG_TYPE_ATOMIC
                                        - CVMX_POW_TAG_TYPE_NULL
                                        - CVMX_POW_TAG_TYPE_NULL_NULL */
#else
        uint64_t    state    : 2;
        uint64_t    unused  : 62;
#endif
    } s_null_rd;

} cvmx_pow_tag_load_resp_t;

/**
 * This structure describes the address used for stores to the POW.
 *  The store address is meaningful on stores to the POW.  The hardware assumes that an aligned
 *  64-bit store was used for all these stores.
 *  Note the assumption that the work queue entry is aligned on an 8-byte
 *  boundary (since the low-order 3 address bits must be zero).
 *  Note that not all fields are used by all operations.
 *
 *  NOTE: The following is the behavior of the pending switch bit at the PP
 *       for POW stores (i.e. when did<7:3> == 0xc)
 *     - did<2:0> == 0      => pending switch bit is set
 *     - did<2:0> == 1      => no affect on the pending switch bit
 *     - did<2:0> == 3      => pending switch bit is cleared
 *     - did<2:0> == 7      => no affect on the pending switch bit
 *     - did<2:0> == others => must not be used
 *     - No other loads/stores have an affect on the pending switch bit
 *     - The switch bus from POW can clear the pending switch bit
 *
 *  NOTE: did<2:0> == 2 is used by the HW for a special single-cycle ADDWQ command
 *  that only contains the pointer). SW must never use did<2:0> == 2.
 */
typedef union
{
    /**
     * Unsigned 64 bit integer representation of store address
     */
    uint64_t u64;

    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    mem_reg         : 2;    /**< Memory region.  Should be CVMX_IO_SEG in most cases */
        uint64_t    reserved_49_61  : 13;   /**< Must be zero */
        uint64_t    is_io           : 1;    /**< Must be one */
        uint64_t    did             : 8;    /**< Device ID of POW.  Note that different sub-dids are used. */
        uint64_t    reserved_36_39  : 4;    /**< Must be zero */
        uint64_t    addr            : 36;   /**< Address field. addr<2:0> must be zero */
#else
        uint64_t    addr            : 36;
        uint64_t    reserved_36_39  : 4;
        uint64_t    did             : 8;
        uint64_t    is_io           : 1;
        uint64_t    reserved_49_61  : 13;
        uint64_t    mem_reg         : 2;
#endif
    } stag;
} cvmx_pow_tag_store_addr_t;

/**
 * decode of the store data when an IOBDMA SENDSINGLE is sent to POW
 */
typedef union
{
    uint64_t u64;

    struct
    {
#if __BYTE_ORDER == __BIG_ENDIAN
        uint64_t    scraddr : 8;    /**< the (64-bit word) location in scratchpad to write to (if len != 0) */
        uint64_t    len     : 8;    /**< the number of words in the response (0 => no response) */
        uint64_t    did     : 8;    /**< the ID of the device on the non-coherent bus */
        uint64_t    unused  :36;
        uint64_t    wait    : 1;    /**< if set, don't return load response until work is available */
        uint64_t    unused2 : 3;
#else
        uint64_t    unused2 : 3;
        uint64_t    wait    : 1;
        uint64_t    unused  :36;
        uint64_t    did     : 8;
        uint64_t    len     : 8;
        uint64_t    scraddr : 8;
#endif
    } s;

} cvmx_pow_iobdma_store_t;


/* CSR typedefs have been moved to cvmx-pow-defs.h */

/**
 * Get the POW tag for this core. This returns the current
 * tag type, tag, group, and POW entry index associated with
 * this core. Index is only valid if the tag type isn't NULL_NULL.
 * If a tag switch is pending this routine returns the tag before
 * the tag switch, not after.
 *
 * @return Current tag
 */
static inline cvmx_pow_tag_req_t cvmx_pow_get_current_tag(void)
{
    cvmx_pow_load_addr_t load_addr;
    cvmx_pow_tag_load_resp_t load_resp;
    cvmx_pow_tag_req_t result;

    load_addr.u64 = 0;
    load_addr.sstatus.mem_region = CVMX_IO_SEG;
    load_addr.sstatus.is_io = 1;
    load_addr.sstatus.did = CVMX_OCT_DID_TAG_TAG1;
    load_addr.sstatus.coreid = cvmx_get_core_num();
    load_addr.sstatus.get_cur = 1;
    load_resp.u64 = cvmx_read_csr(load_addr.u64);
    result.u64 = 0;
    result.s.grp = load_resp.s_sstatus2.grp;
    result.s.index = load_resp.s_sstatus2.index;
    result.s.type = (cvmx_pow_tag_type_t)load_resp.s_sstatus2.tag_type;
    result.s.tag = load_resp.s_sstatus2.tag;
    return result;
}


/**
 * Get the POW WQE for this core. This returns the work queue
 * entry currently associated with this core.
 *
 * @return WQE pointer
 */
static inline cvmx_wqe_t *cvmx_pow_get_current_wqp(void)
{
    cvmx_pow_load_addr_t load_addr;
    cvmx_pow_tag_load_resp_t load_resp;

    load_addr.u64 = 0;
    load_addr.sstatus.mem_region = CVMX_IO_SEG;
    load_addr.sstatus.is_io = 1;
    load_addr.sstatus.did = CVMX_OCT_DID_TAG_TAG1;
    load_addr.sstatus.coreid = cvmx_get_core_num();
    load_addr.sstatus.get_cur = 1;
    load_addr.sstatus.get_wqp = 1;
    load_resp.u64 = cvmx_read_csr(load_addr.u64);
    return (cvmx_wqe_t*)cvmx_phys_to_ptr(load_resp.s_sstatus4.wqp);
}


/**
 * @INTERNAL
 * Print a warning if a tag switch is pending for this core
 *
 * @param function Function name checking for a pending tag switch
 */
static inline void __cvmx_pow_warn_if_pending_switch(const char *function)
{
    uint64_t switch_complete;
    CVMX_MF_CHORD(switch_complete);
    cvmx_warn_if(!switch_complete, "%s called with tag switch in progress\n", function);
}


/**
 * Waits for a tag switch to complete by polling the completion bit.
 * Note that switches to NULL complete immediately and do not need
 * to be waited for.
 */
static inline void cvmx_pow_tag_sw_wait(void)
{
    const uint64_t MAX_CYCLES = 1ull<<31;
    uint64_t switch_complete;
    uint64_t start_cycle = cvmx_get_cycle();
    while (1)
    {
        CVMX_MF_CHORD(switch_complete);
        if (cvmx_unlikely(switch_complete))
            break;
        if (cvmx_unlikely(cvmx_get_cycle() > start_cycle + MAX_CYCLES))
        {
            cvmx_dprintf("WARNING: Tag switch is taking a long time, possible deadlock\n");
            start_cycle = -MAX_CYCLES-1;
        }
    }
}


/**
 * Synchronous work request.  Requests work from the POW.
 * This function does NOT wait for previous tag switches to complete,
 * so the caller must ensure that there is not a pending tag switch.
 *
 * @param wait   When set, call stalls until work becomes avaiable, or times out.
 *               If not set, returns immediately.
 *
 * @return Returns the WQE pointer from POW. Returns NULL if no work was available.
 */
static inline cvmx_wqe_t * cvmx_pow_work_request_sync_nocheck(cvmx_pow_wait_t wait)
{
    cvmx_pow_load_addr_t ptr;
    cvmx_pow_tag_load_resp_t result;

    if (CVMX_ENABLE_POW_CHECKS)
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);

    ptr.u64 = 0;
    ptr.swork.mem_region = CVMX_IO_SEG;
    ptr.swork.is_io = 1;
    ptr.swork.did = CVMX_OCT_DID_TAG_SWTAG;
    ptr.swork.wait = wait;

    result.u64 = cvmx_read_csr(ptr.u64);

    if (result.s_work.no_work)
        return NULL;
    else
        return (cvmx_wqe_t*)cvmx_phys_to_ptr(result.s_work.addr);
}


/**
 * Synchronous work request.  Requests work from the POW.
 * This function waits for any previous tag switch to complete before
 * requesting the new work.
 *
 * @param wait   When set, call stalls until work becomes avaiable, or times out.
 *               If not set, returns immediately.
 *
 * @return Returns the WQE pointer from POW. Returns NULL if no work was available.
 */
static inline cvmx_wqe_t * cvmx_pow_work_request_sync(cvmx_pow_wait_t wait)
{
    if (CVMX_ENABLE_POW_CHECKS)
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);

    /* Must not have a switch pending when requesting work */
    cvmx_pow_tag_sw_wait();
    return(cvmx_pow_work_request_sync_nocheck(wait));

}


/**
 * Synchronous null_rd request.  Requests a switch out of NULL_NULL POW state.
 * This function waits for any previous tag switch to complete before
 * requesting the null_rd.
 *
 * @return Returns the POW state of type cvmx_pow_tag_type_t.
 */
static inline cvmx_pow_tag_type_t cvmx_pow_work_request_null_rd(void)
{
    cvmx_pow_load_addr_t ptr;
    cvmx_pow_tag_load_resp_t result;

    if (CVMX_ENABLE_POW_CHECKS)
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);

    /* Must not have a switch pending when requesting work */
    cvmx_pow_tag_sw_wait();

    ptr.u64 = 0;
    ptr.snull_rd.mem_region = CVMX_IO_SEG;
    ptr.snull_rd.is_io = 1;
    ptr.snull_rd.did = CVMX_OCT_DID_TAG_NULL_RD;

    result.u64 = cvmx_read_csr(ptr.u64);

    return (cvmx_pow_tag_type_t)result.s_null_rd.state;
}


/**
 * Asynchronous work request.  Work is requested from the POW unit, and should later
 * be checked with function cvmx_pow_work_response_async.
 * This function does NOT wait for previous tag switches to complete,
 * so the caller must ensure that there is not a pending tag switch.
 *
 * @param scr_addr Scratch memory address that response will be returned to,
 *                  which is either a valid WQE, or a response with the invalid bit set.
 *                  Byte address, must be 8 byte aligned.
 * @param wait      1 to cause response to wait for work to become available (or timeout)
 *                  0 to cause response to return immediately
 */
static inline void cvmx_pow_work_request_async_nocheck(int scr_addr, cvmx_pow_wait_t wait)
{
    cvmx_pow_iobdma_store_t data;

    if (CVMX_ENABLE_POW_CHECKS)
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);

    /* scr_addr must be 8 byte aligned */
    data.s.scraddr = scr_addr >> 3;
    data.s.len = 1;
    data.s.did = CVMX_OCT_DID_TAG_SWTAG;
    data.s.wait = wait;
    cvmx_send_single(data.u64);
}
/**
 * Asynchronous work request.  Work is requested from the POW unit, and should later
 * be checked with function cvmx_pow_work_response_async.
 * This function waits for any previous tag switch to complete before
 * requesting the new work.
 *
 * @param scr_addr Scratch memory address that response will be returned to,
 *                  which is either a valid WQE, or a response with the invalid bit set.
 *                  Byte address, must be 8 byte aligned.
 * @param wait      1 to cause response to wait for work to become available (or timeout)
 *                  0 to cause response to return immediately
 */
static inline void cvmx_pow_work_request_async(int scr_addr, cvmx_pow_wait_t wait)
{
    if (CVMX_ENABLE_POW_CHECKS)
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);

    /* Must not have a switch pending when requesting work */
    cvmx_pow_tag_sw_wait();
    cvmx_pow_work_request_async_nocheck(scr_addr, wait);
}


/**
 * Gets result of asynchronous work request.  Performs a IOBDMA sync
 * to wait for the response.
 *
 * @param scr_addr Scratch memory address to get result from
 *                  Byte address, must be 8 byte aligned.
 * @return Returns the WQE from the scratch register, or NULL if no work was available.
 */
static inline cvmx_wqe_t * cvmx_pow_work_response_async(int scr_addr)
{
    cvmx_pow_tag_load_resp_t result;

    CVMX_SYNCIOBDMA;
    result.u64 = cvmx_scratch_read64(scr_addr);

    if (result.s_work.no_work)
        return NULL;
    else
        return (cvmx_wqe_t*)cvmx_phys_to_ptr(result.s_work.addr);
}


/**
 * Checks if a work queue entry pointer returned by a work
 * request is valid.  It may be invalid due to no work
 * being available or due to a timeout.
 *
 * @param wqe_ptr pointer to a work queue entry returned by the POW
 *
 * @return 0 if pointer is valid
 *         1 if invalid (no work was returned)
 */
static inline uint64_t cvmx_pow_work_invalid(cvmx_wqe_t *wqe_ptr)
{
    return (wqe_ptr == NULL);
}



/**
 * Starts a tag switch to the provided tag value and tag type.  Completion for
 * the tag switch must be checked for separately.
 * This function does NOT update the
 * work queue entry in dram to match tag value and type, so the application must
 * keep track of these if they are important to the application.
 * This tag switch command must not be used for switches to NULL, as the tag
 * switch pending bit will be set by the switch request, but never cleared by the
 * hardware.
 *
 * NOTE: This should not be used when switching from a NULL tag.  Use
 * cvmx_pow_tag_sw_full() instead.
 *
 * This function does no checks, so the caller must ensure that any previous tag
 * switch has completed.
 *
 * @param tag      new tag value
 * @param tag_type new tag type (ordered or atomic)
 */
static inline void cvmx_pow_tag_sw_nocheck(uint32_t tag, cvmx_pow_tag_type_t tag_type)
{
    cvmx_addr_t ptr;
    cvmx_pow_tag_req_t tag_req;

    if (CVMX_ENABLE_POW_CHECKS)
    {
        cvmx_pow_tag_req_t current_tag;
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);
        current_tag = cvmx_pow_get_current_tag();
        cvmx_warn_if(current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL, "%s called with NULL_NULL tag\n", __FUNCTION__);
        cvmx_warn_if(current_tag.s.type == CVMX_POW_TAG_TYPE_NULL, "%s called with NULL tag\n", __FUNCTION__);
        cvmx_warn_if((current_tag.s.type == tag_type) && (current_tag.s.tag == tag), "%s called to perform a tag switch to the same tag\n", __FUNCTION__);
        cvmx_warn_if(tag_type == CVMX_POW_TAG_TYPE_NULL, "%s called to perform a tag switch to NULL. Use cvmx_pow_tag_sw_null() instead\n", __FUNCTION__);
    }

    /* Note that WQE in DRAM is not updated here, as the POW does not read from DRAM
    ** once the WQE is in flight.  See hardware manual for complete details.
    ** It is the application's responsibility to keep track of the current tag
    ** value if that is important.
    */


    tag_req.u64 = 0;
    tag_req.s.op = CVMX_POW_TAG_OP_SWTAG;
    tag_req.s.tag = tag;
    tag_req.s.type = tag_type;

    ptr.u64 = 0;
    ptr.sio.mem_region = CVMX_IO_SEG;
    ptr.sio.is_io = 1;
    ptr.sio.did = CVMX_OCT_DID_TAG_SWTAG;

    /* once this store arrives at POW, it will attempt the switch
       software must wait for the switch to complete separately */
    cvmx_write_io(ptr.u64, tag_req.u64);
}


/**
 * Starts a tag switch to the provided tag value and tag type.  Completion for
 * the tag switch must be checked for separately.
 * This function does NOT update the
 * work queue entry in dram to match tag value and type, so the application must
 * keep track of these if they are important to the application.
 * This tag switch command must not be used for switches to NULL, as the tag
 * switch pending bit will be set by the switch request, but never cleared by the
 * hardware.
 *
 * NOTE: This should not be used when switching from a NULL tag.  Use
 * cvmx_pow_tag_sw_full() instead.
 *
 * This function waits for any previous tag switch to complete, and also
 * displays an error on tag switches to NULL.
 *
 * @param tag      new tag value
 * @param tag_type new tag type (ordered or atomic)
 */
static inline void cvmx_pow_tag_sw(uint32_t tag, cvmx_pow_tag_type_t tag_type)
{
    if (CVMX_ENABLE_POW_CHECKS)
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);

    /* Note that WQE in DRAM is not updated here, as the POW does not read from DRAM
    ** once the WQE is in flight.  See hardware manual for complete details.
    ** It is the application's responsibility to keep track of the current tag
    ** value if that is important.
    */

    /* Ensure that there is not a pending tag switch, as a tag switch cannot be started
    ** if a previous switch is still pending.  */
    cvmx_pow_tag_sw_wait();
    cvmx_pow_tag_sw_nocheck(tag, tag_type);
}


/**
 * Starts a tag switch to the provided tag value and tag type.  Completion for
 * the tag switch must be checked for separately.
 * This function does NOT update the
 * work queue entry in dram to match tag value and type, so the application must
 * keep track of these if they are important to the application.
 * This tag switch command must not be used for switches to NULL, as the tag
 * switch pending bit will be set by the switch request, but never cleared by the
 * hardware.
 *
 * This function must be used for tag switches from NULL.
 *
 * This function does no checks, so the caller must ensure that any previous tag
 * switch has completed.
 *
 * @param wqp      pointer to work queue entry to submit.  This entry is updated to match the other parameters
 * @param tag      tag value to be assigned to work queue entry
 * @param tag_type type of tag
 * @param group      group value for the work queue entry.
 */
static inline void cvmx_pow_tag_sw_full_nocheck(cvmx_wqe_t *wqp, uint32_t tag, cvmx_pow_tag_type_t tag_type, uint64_t group)
{
    cvmx_addr_t ptr;
    cvmx_pow_tag_req_t tag_req;

    if (CVMX_ENABLE_POW_CHECKS)
    {
        cvmx_pow_tag_req_t current_tag;
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);
        current_tag = cvmx_pow_get_current_tag();
        cvmx_warn_if(current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL, "%s called with NULL_NULL tag\n", __FUNCTION__);
        cvmx_warn_if((current_tag.s.type == tag_type) && (current_tag.s.tag == tag), "%s called to perform a tag switch to the same tag\n", __FUNCTION__);
        cvmx_warn_if(tag_type == CVMX_POW_TAG_TYPE_NULL, "%s called to perform a tag switch to NULL. Use cvmx_pow_tag_sw_null() instead\n", __FUNCTION__);
        if (wqp != cvmx_phys_to_ptr(0x80))
            cvmx_warn_if(wqp != cvmx_pow_get_current_wqp(), "%s passed WQE(%p) doesn't match the address in the POW(%p)\n", __FUNCTION__, wqp, cvmx_pow_get_current_wqp());
    }

    /* Note that WQE in DRAM is not updated here, as the POW does not read from DRAM
    ** once the WQE is in flight.  See hardware manual for complete details.
    ** It is the application's responsibility to keep track of the current tag
    ** value if that is important.
    */

    tag_req.u64 = 0;
    tag_req.s.op = CVMX_POW_TAG_OP_SWTAG_FULL;
    tag_req.s.tag = tag;
    tag_req.s.type = tag_type;
    tag_req.s.grp = group;

    ptr.u64 = 0;
    ptr.sio.mem_region = CVMX_IO_SEG;
    ptr.sio.is_io = 1;
    ptr.sio.did = CVMX_OCT_DID_TAG_SWTAG;
    ptr.sio.offset = CAST64(wqp);

    /* once this store arrives at POW, it will attempt the switch
       software must wait for the switch to complete separately */
    cvmx_write_io(ptr.u64, tag_req.u64);
}


/**
 * Starts a tag switch to the provided tag value and tag type.  Completion for
 * the tag switch must be checked for separately.
 * This function does NOT update the
 * work queue entry in dram to match tag value and type, so the application must
 * keep track of these if they are important to the application.
 * This tag switch command must not be used for switches to NULL, as the tag
 * switch pending bit will be set by the switch request, but never cleared by the
 * hardware.
 *
 * This function must be used for tag switches from NULL.
 *
 * This function waits for any pending tag switches to complete
 * before requesting the tag switch.
 *
 * @param wqp      pointer to work queue entry to submit.  This entry is updated to match the other parameters
 * @param tag      tag value to be assigned to work queue entry
 * @param tag_type type of tag
 * @param group      group value for the work queue entry.
 */
static inline void cvmx_pow_tag_sw_full(cvmx_wqe_t *wqp, uint32_t tag, cvmx_pow_tag_type_t tag_type, uint64_t group)
{
    if (CVMX_ENABLE_POW_CHECKS)
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);

    /* Ensure that there is not a pending tag switch, as a tag switch cannot be started
    ** if a previous switch is still pending.  */
    cvmx_pow_tag_sw_wait();
    cvmx_pow_tag_sw_full_nocheck(wqp, tag, tag_type, group);
}


/**
 * Switch to a NULL tag, which ends any ordering or
 * synchronization provided by the POW for the current
 * work queue entry.  This operation completes immediatly,
 * so completetion should not be waited for.
 * This function does NOT wait for previous tag switches to complete,
 * so the caller must ensure that any previous tag switches have completed.
 */
static inline void cvmx_pow_tag_sw_null_nocheck(void)
{
    cvmx_addr_t ptr;
    cvmx_pow_tag_req_t tag_req;

    if (CVMX_ENABLE_POW_CHECKS)
    {
        cvmx_pow_tag_req_t current_tag;
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);
        current_tag = cvmx_pow_get_current_tag();
        cvmx_warn_if(current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL, "%s called with NULL_NULL tag\n", __FUNCTION__);
        cvmx_warn_if(current_tag.s.type == CVMX_POW_TAG_TYPE_NULL, "%s called when we already have a NULL tag\n", __FUNCTION__);
    }

    tag_req.u64 = 0;
    tag_req.s.op = CVMX_POW_TAG_OP_SWTAG;
    tag_req.s.type = CVMX_POW_TAG_TYPE_NULL;


    ptr.u64 = 0;
    ptr.sio.mem_region = CVMX_IO_SEG;
    ptr.sio.is_io = 1;
    ptr.sio.did = CVMX_OCT_DID_TAG_TAG1;


    cvmx_write_io(ptr.u64, tag_req.u64);

    /* switch to NULL completes immediately */
}

/**
 * Switch to a NULL tag, which ends any ordering or
 * synchronization provided by the POW for the current
 * work queue entry.  This operation completes immediatly,
 * so completetion should not be waited for.
 * This function waits for any pending tag switches to complete
 * before requesting the switch to NULL.
 */
static inline void cvmx_pow_tag_sw_null(void)
{
    if (CVMX_ENABLE_POW_CHECKS)
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);

    /* Ensure that there is not a pending tag switch, as a tag switch cannot be started
    ** if a previous switch is still pending.  */
    cvmx_pow_tag_sw_wait();
    cvmx_pow_tag_sw_null_nocheck();

    /* switch to NULL completes immediately */
}



/**
 * Submits work to an input queue.  This function updates the work queue entry in DRAM to match
 * the arguments given.
 * Note that the tag provided is for the work queue entry submitted, and is unrelated to the tag that
 * the core currently holds.
 *
 * @param wqp      pointer to work queue entry to submit.  This entry is updated to match the other parameters
 * @param tag      tag value to be assigned to work queue entry
 * @param tag_type type of tag
 * @param qos      Input queue to add to.
 * @param grp      group value for the work queue entry.
 */
static inline void cvmx_pow_work_submit(cvmx_wqe_t *wqp, uint32_t tag, cvmx_pow_tag_type_t tag_type, uint64_t qos, uint64_t grp)
{
    cvmx_addr_t ptr;
    cvmx_pow_tag_req_t tag_req;

    wqp->qos = qos;
    wqp->tag = tag;
    wqp->tag_type = tag_type;
    wqp->grp = grp;

    tag_req.u64 = 0;
    tag_req.s.op = CVMX_POW_TAG_OP_ADDWQ;
    tag_req.s.type = tag_type;
    tag_req.s.tag = tag;
    tag_req.s.qos = qos;
    tag_req.s.grp = grp;


    ptr.u64 = 0;
    ptr.sio.mem_region = CVMX_IO_SEG;
    ptr.sio.is_io = 1;
    ptr.sio.did = CVMX_OCT_DID_TAG_TAG1;
    ptr.sio.offset = cvmx_ptr_to_phys(wqp);

    /* SYNC write to memory before the work submit.  This is necessary
    ** as POW may read values from DRAM at this time */
    CVMX_SYNCWS;
    cvmx_write_io(ptr.u64, tag_req.u64);
}



/**
 * This function sets the group mask for a core.  The group mask
 * indicates which groups each core will accept work from. There are
 * 16 groups.
 *
 * @param core_num   core to apply mask to
 * @param mask   Group mask. There are 16 groups, so only bits 0-15 are valid,
 *               representing groups 0-15.
 *               Each 1 bit in the mask enables the core to accept work from
 *               the corresponding group.
 */
static inline void cvmx_pow_set_group_mask(uint64_t core_num, uint64_t mask)
{
    cvmx_pow_pp_grp_mskx_t grp_msk;

    grp_msk.u64 = cvmx_read_csr(CVMX_POW_PP_GRP_MSKX(core_num));
    grp_msk.s.grp_msk = mask;
    cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(core_num), grp_msk.u64);
}

/**
 * This function sets POW static priorities for a core. Each input queue has
 * an associated priority value.
 *
 * @param core_num   core to apply priorities to
 * @param priority   Vector of 8 priorities, one per POW Input Queue (0-7).
 *                   Highest priority is 0 and lowest is 7. A priority value
 *                   of 0xF instructs POW to skip the Input Queue when
 *                   scheduling to this specific core.
 *                   NOTE: priorities should not have gaps in values, meaning
 *                         {0,1,1,1,1,1,1,1} is a valid configuration while
 *                         {0,2,2,2,2,2,2,2} is not.
 */
static inline void cvmx_pow_set_priority(uint64_t core_num, const uint8_t priority[])
{
    /* POW priorities are supported on CN5xxx and later */
    if (!OCTEON_IS_MODEL(OCTEON_CN3XXX))
    {
        cvmx_pow_pp_grp_mskx_t grp_msk;

        grp_msk.u64 = cvmx_read_csr(CVMX_POW_PP_GRP_MSKX(core_num));
        grp_msk.s.qos0_pri = priority[0];
        grp_msk.s.qos1_pri = priority[1];
        grp_msk.s.qos2_pri = priority[2];
        grp_msk.s.qos3_pri = priority[3];
        grp_msk.s.qos4_pri = priority[4];
        grp_msk.s.qos5_pri = priority[5];
        grp_msk.s.qos6_pri = priority[6];
        grp_msk.s.qos7_pri = priority[7];

        /* Detect gaps between priorities and flag error */
        {
            int i;
            uint32_t prio_mask = 0;

            for(i=0; i<8; i++)
               if (priority[i] != 0xF)
		   prio_mask |= 1<<priority[i];

            if ( prio_mask ^ ((1<<cvmx_pop(prio_mask)) - 1))
            {
                cvmx_dprintf("ERROR: POW static priorities should be contiguous (0x%llx)\n", (unsigned long long)prio_mask);
                return;
            }
        }

        cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(core_num), grp_msk.u64);
    }
}

/**
 * Performs a tag switch and then an immediate deschedule. This completes
 * immediatly, so completion must not be waited for.  This function does NOT
 * update the wqe in DRAM to match arguments.
 *
 * This function does NOT wait for any prior tag switches to complete, so the
 * calling code must do this.
 *
 * Note the following CAVEAT of the Octeon HW behavior when
 * re-scheduling DE-SCHEDULEd items whose (next) state is
 * ORDERED:
 *   - If there are no switches pending at the time that the
 *     HW executes the de-schedule, the HW will only re-schedule
 *     the head of the FIFO associated with the given tag. This
 *     means that in many respects, the HW treats this ORDERED
 *     tag as an ATOMIC tag. Note that in the SWTAG_DESCH
 *     case (to an ORDERED tag), the HW will do the switch
 *     before the deschedule whenever it is possible to do
 *     the switch immediately, so it may often look like
 *     this case.
 *   - If there is a pending switch to ORDERED at the time
 *     the HW executes the de-schedule, the HW will perform
 *     the switch at the time it re-schedules, and will be
 *     able to reschedule any/all of the entries with the
 *     same tag.
 * Due to this behavior, the RECOMMENDATION to software is
 * that they have a (next) state of ATOMIC when they
 * DE-SCHEDULE. If an ORDERED tag is what was really desired,
 * SW can choose to immediately switch to an ORDERED tag
 * after the work (that has an ATOMIC tag) is re-scheduled.
 * Note that since there are never any tag switches pending
 * when the HW re-schedules, this switch can be IMMEDIATE upon
 * the reception of the pointer during the re-schedule.
 *
 * @param tag      New tag value
 * @param tag_type New tag type
 * @param group    New group value
 * @param no_sched Control whether this work queue entry will be rescheduled.
 *                 - 1 : don't schedule this work
 *                 - 0 : allow this work to be scheduled.
 */
static inline void cvmx_pow_tag_sw_desched_nocheck(uint32_t tag, cvmx_pow_tag_type_t tag_type, uint64_t group, uint64_t no_sched)
{
    cvmx_addr_t ptr;
    cvmx_pow_tag_req_t tag_req;

    if (CVMX_ENABLE_POW_CHECKS)
    {
        cvmx_pow_tag_req_t current_tag;
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);
        current_tag = cvmx_pow_get_current_tag();
        cvmx_warn_if(current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL, "%s called with NULL_NULL tag\n", __FUNCTION__);
        cvmx_warn_if(current_tag.s.type == CVMX_POW_TAG_TYPE_NULL, "%s called with NULL tag. Deschedule not allowed from NULL state\n", __FUNCTION__);
        cvmx_warn_if((current_tag.s.type != CVMX_POW_TAG_TYPE_ATOMIC) && (tag_type != CVMX_POW_TAG_TYPE_ATOMIC), "%s called where neither the before or after tag is ATOMIC\n", __FUNCTION__);
    }

    tag_req.u64 = 0;
    tag_req.s.op = CVMX_POW_TAG_OP_SWTAG_DESCH;
    tag_req.s.tag = tag;
    tag_req.s.type = tag_type;
    tag_req.s.grp = group;
    tag_req.s.no_sched = no_sched;

    ptr.u64 = 0;
    ptr.sio.mem_region = CVMX_IO_SEG;
    ptr.sio.is_io = 1;
    ptr.sio.did = CVMX_OCT_DID_TAG_TAG3;

    cvmx_write_io(ptr.u64, tag_req.u64); /* since TAG3 is used, this store will clear the local pending switch bit */
}
/**
 * Performs a tag switch and then an immediate deschedule. This completes
 * immediatly, so completion must not be waited for.  This function does NOT
 * update the wqe in DRAM to match arguments.
 *
 * This function waits for any prior tag switches to complete, so the
 * calling code may call this function with a pending tag switch.
 *
 * Note the following CAVEAT of the Octeon HW behavior when
 * re-scheduling DE-SCHEDULEd items whose (next) state is
 * ORDERED:
 *   - If there are no switches pending at the time that the
 *     HW executes the de-schedule, the HW will only re-schedule
 *     the head of the FIFO associated with the given tag. This
 *     means that in many respects, the HW treats this ORDERED
 *     tag as an ATOMIC tag. Note that in the SWTAG_DESCH
 *     case (to an ORDERED tag), the HW will do the switch
 *     before the deschedule whenever it is possible to do
 *     the switch immediately, so it may often look like
 *     this case.
 *   - If there is a pending switch to ORDERED at the time
 *     the HW executes the de-schedule, the HW will perform
 *     the switch at the time it re-schedules, and will be
 *     able to reschedule any/all of the entries with the
 *     same tag.
 * Due to this behavior, the RECOMMENDATION to software is
 * that they have a (next) state of ATOMIC when they
 * DE-SCHEDULE. If an ORDERED tag is what was really desired,
 * SW can choose to immediately switch to an ORDERED tag
 * after the work (that has an ATOMIC tag) is re-scheduled.
 * Note that since there are never any tag switches pending
 * when the HW re-schedules, this switch can be IMMEDIATE upon
 * the reception of the pointer during the re-schedule.
 *
 * @param tag      New tag value
 * @param tag_type New tag type
 * @param group    New group value
 * @param no_sched Control whether this work queue entry will be rescheduled.
 *                 - 1 : don't schedule this work
 *                 - 0 : allow this work to be scheduled.
 */
static inline void cvmx_pow_tag_sw_desched(uint32_t tag, cvmx_pow_tag_type_t tag_type, uint64_t group, uint64_t no_sched)
{
    if (CVMX_ENABLE_POW_CHECKS)
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);

    /* Need to make sure any writes to the work queue entry are complete */
    CVMX_SYNCWS;
    /* Ensure that there is not a pending tag switch, as a tag switch cannot be started
    ** if a previous switch is still pending.  */
    cvmx_pow_tag_sw_wait();
    cvmx_pow_tag_sw_desched_nocheck(tag, tag_type, group, no_sched);
}





/**
 * Descchedules the current work queue entry.
 *
 * @param no_sched no schedule flag value to be set on the work queue entry.  If this is set
 *                 the entry will not be rescheduled.
 */
static inline void cvmx_pow_desched(uint64_t no_sched)
{
    cvmx_addr_t ptr;
    cvmx_pow_tag_req_t tag_req;

    if (CVMX_ENABLE_POW_CHECKS)
    {
        cvmx_pow_tag_req_t current_tag;
        __cvmx_pow_warn_if_pending_switch(__FUNCTION__);
        current_tag = cvmx_pow_get_current_tag();
        cvmx_warn_if(current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL, "%s called with NULL_NULL tag\n", __FUNCTION__);
        cvmx_warn_if(current_tag.s.type == CVMX_POW_TAG_TYPE_NULL, "%s called with NULL tag. Deschedule not expected from NULL state\n", __FUNCTION__);
    }

    /* Need to make sure any writes to the work queue entry are complete */
    CVMX_SYNCWS;

    tag_req.u64 = 0;
    tag_req.s.op = CVMX_POW_TAG_OP_DESCH;
    tag_req.s.no_sched = no_sched;

    ptr.u64 = 0;
    ptr.sio.mem_region = CVMX_IO_SEG;
    ptr.sio.is_io = 1;
    ptr.sio.did = CVMX_OCT_DID_TAG_TAG3;

    cvmx_write_io(ptr.u64, tag_req.u64); /* since TAG3 is used, this store will clear the local pending switch bit */
}







/***********************************************************************************************
** Define usage of bits within the 32 bit tag values.
***********************************************************************************************/

/*
 * Number of bits of the tag used by software.  The SW bits
 * are always a contiguous block of the high starting at bit 31.
 * The hardware bits are always the low bits.  By default, the top 8 bits
 * of the tag are reserved for software, and the low 24 are set by the IPD unit.
 */
#define CVMX_TAG_SW_BITS    (8)
#define CVMX_TAG_SW_SHIFT   (32 - CVMX_TAG_SW_BITS)

/* Below is the list of values for the top 8 bits of the tag. */
#define CVMX_TAG_SW_BITS_INTERNAL  0x1  /* Tag values with top byte of this value are reserved for internal executive uses */
/* The executive divides the remaining 24 bits as follows:
**  * the upper 8 bits (bits 23 - 16 of the tag) define a subgroup
**  * the lower 16 bits (bits 15 - 0 of the tag) define are the value with the subgroup
** Note that this section describes the format of tags generated by software - refer to the
** hardware documentation for a description of the tags values generated by the packet input
** hardware.
** Subgroups are defined here */
#define CVMX_TAG_SUBGROUP_MASK  0xFFFF /* Mask for the value portion of the tag */
#define CVMX_TAG_SUBGROUP_SHIFT 16
#define CVMX_TAG_SUBGROUP_PKO  0x1


/* End of executive tag subgroup definitions */

/* The remaining values software bit values 0x2 - 0xff are available for application use */



/**
 * This function creates a 32 bit tag value from the two values provided.
 *
 * @param sw_bits The upper bits (number depends on configuration) are set to this value.  The remainder of
 *                bits are set by the hw_bits parameter.
 * @param hw_bits The lower bits (number depends on configuration) are set to this value.  The remainder of
 *                bits are set by the sw_bits parameter.
 *
 * @return 32 bit value of the combined hw and sw bits.
 */
static inline uint32_t cvmx_pow_tag_compose(uint64_t sw_bits, uint64_t hw_bits)
{
    return((((sw_bits & cvmx_build_mask(CVMX_TAG_SW_BITS)) << CVMX_TAG_SW_SHIFT) | (hw_bits & cvmx_build_mask(32 - CVMX_TAG_SW_BITS))));
}
/**
 * Extracts the bits allocated for software use from the tag
 *
 * @param tag    32 bit tag value
 *
 * @return N bit software tag value, where N is configurable with the CVMX_TAG_SW_BITS define
 */
static inline uint32_t cvmx_pow_tag_get_sw_bits(uint64_t tag)
{
    return((tag >> (32 - CVMX_TAG_SW_BITS)) & cvmx_build_mask(CVMX_TAG_SW_BITS));
}
/**
 *
 * Extracts the bits allocated for hardware use from the tag
 *
 * @param tag    32 bit tag value
 *
 * @return (32 - N) bit software tag value, where N is configurable with the CVMX_TAG_SW_BITS define
 */
static inline uint32_t cvmx_pow_tag_get_hw_bits(uint64_t tag)
{
    return(tag & cvmx_build_mask(32 - CVMX_TAG_SW_BITS));
}

/**
 * Store the current POW internal state into the supplied
 * buffer. It is recommended that you pass a buffer of at least
 * 128KB. The format of the capture may change based on SDK
 * version and Octeon chip.
 *
 * @param buffer Buffer to store capture into
 * @param buffer_size
 *               The size of the supplied buffer
 *
 * @return Zero on sucess, negative on failure
 */
extern int cvmx_pow_capture(void *buffer, int buffer_size);

/**
 * Dump a POW capture to the console in a human readable format.
 *
 * @param buffer POW capture from cvmx_pow_capture()
 * @param buffer_size
 *               Size of the buffer
 */
extern void cvmx_pow_display(void *buffer, int buffer_size);

/**
 * Return the number of POW entries supported by this chip
 *
 * @return Number of POW entries
 */
extern int cvmx_pow_get_num_entries(void);


#ifdef	__cplusplus
}
#endif

#endif  /* __CVMX_POW_H__ */