mirror of https://github.com/hak5/openwrt.git
191 lines
6.2 KiB
C
191 lines
6.2 KiB
C
/*
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* Copyright (c) 2007 Atheros Communications Inc.
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* All rights reserved.
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*
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* $ATH_LICENSE_HOSTSDK0_C$
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*
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*/
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#ifndef __HTC_H__
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#define __HTC_H__
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#ifndef ATH_TARGET
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#include "athstartpack.h"
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#endif
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#define A_OFFSETOF(type,field) (int)(&(((type *)NULL)->field))
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#define ASSEMBLE_UNALIGNED_UINT16(p,highbyte,lowbyte) \
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(((A_UINT16)(((A_UINT8 *)(p))[(highbyte)])) << 8 | (A_UINT16)(((A_UINT8 *)(p))[(lowbyte)]))
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/* alignment independent macros (little-endian) to fetch UINT16s or UINT8s from a
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* structure using only the type and field name.
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* Use these macros if there is the potential for unaligned buffer accesses. */
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#define A_GET_UINT16_FIELD(p,type,field) \
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ASSEMBLE_UNALIGNED_UINT16(p,\
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A_OFFSETOF(type,field) + 1, \
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A_OFFSETOF(type,field))
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#define A_SET_UINT16_FIELD(p,type,field,value) \
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{ \
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((A_UINT8 *)(p))[A_OFFSETOF(type,field)] = (A_UINT8)(value); \
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((A_UINT8 *)(p))[A_OFFSETOF(type,field) + 1] = (A_UINT8)((value) >> 8); \
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}
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#define A_GET_UINT8_FIELD(p,type,field) \
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((A_UINT8 *)(p))[A_OFFSETOF(type,field)]
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#define A_SET_UINT8_FIELD(p,type,field,value) \
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((A_UINT8 *)(p))[A_OFFSETOF(type,field)] = (value)
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/****** DANGER DANGER ***************
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*
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* The frame header length and message formats defined herein were
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* selected to accommodate optimal alignment for target processing. This reduces code
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* size and improves performance.
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*
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* Any changes to the header length may alter the alignment and cause exceptions
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* on the target. When adding to the message structures insure that fields are
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* properly aligned.
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*
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*/
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/* HTC frame header */
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typedef PREPACK struct _HTC_FRAME_HDR{
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/* do not remove or re-arrange these fields, these are minimally required
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* to take advantage of 4-byte lookaheads in some hardware implementations */
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A_UINT8 EndpointID;
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A_UINT8 Flags;
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A_UINT16 PayloadLen; /* length of data (including trailer) that follows the header */
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/***** end of 4-byte lookahead ****/
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A_UINT8 ControlBytes[2];
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/* message payload starts after the header */
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} POSTPACK HTC_FRAME_HDR;
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/* frame header flags */
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#define HTC_FLAGS_NEED_CREDIT_UPDATE (1 << 0)
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#define HTC_FLAGS_RECV_TRAILER (1 << 1)
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#define HTC_HDR_LENGTH (sizeof(HTC_FRAME_HDR))
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#define HTC_MAX_TRAILER_LENGTH 255
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#define HTC_MAX_PAYLOAD_LENGTH (2048 - sizeof(HTC_FRAME_HDR))
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/* HTC control message IDs */
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typedef enum {
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HTC_MSG_READY_ID = 1,
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HTC_MSG_CONNECT_SERVICE_ID = 2,
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HTC_MSG_CONNECT_SERVICE_RESPONSE_ID = 3,
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HTC_MSG_SETUP_COMPLETE_ID = 4,
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} HTC_MSG_IDS;
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#define HTC_MAX_CONTROL_MESSAGE_LENGTH 256
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/* base message ID header */
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typedef PREPACK struct {
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A_UINT16 MessageID;
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} POSTPACK HTC_UNKNOWN_MSG;
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/* HTC ready message
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* direction : target-to-host */
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typedef PREPACK struct {
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A_UINT16 MessageID; /* ID */
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A_UINT16 CreditCount; /* number of credits the target can offer */
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A_UINT16 CreditSize; /* size of each credit */
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A_UINT8 MaxEndpoints; /* maximum number of endpoints the target has resources for */
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A_UINT8 _Pad1;
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} POSTPACK HTC_READY_MSG;
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#define HTC_SERVICE_META_DATA_MAX_LENGTH 128
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/* connect service
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* direction : host-to-target */
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typedef PREPACK struct {
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A_UINT16 MessageID;
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A_UINT16 ServiceID; /* service ID of the service to connect to */
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A_UINT16 ConnectionFlags; /* connection flags */
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#define HTC_CONNECT_FLAGS_REDUCE_CREDIT_DRIBBLE (1 << 2) /* reduce credit dribbling when
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the host needs credits */
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#define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_MASK (0x3)
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#define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_ONE_FOURTH 0x0
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#define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_ONE_HALF 0x1
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#define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_THREE_FOURTHS 0x2
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#define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_UNITY 0x3
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A_UINT8 ServiceMetaLength; /* length of meta data that follows */
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A_UINT8 _Pad1;
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/* service-specific meta data starts after the header */
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} POSTPACK HTC_CONNECT_SERVICE_MSG;
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/* connect response
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* direction : target-to-host */
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typedef PREPACK struct {
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A_UINT16 MessageID;
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A_UINT16 ServiceID; /* service ID that the connection request was made */
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A_UINT8 Status; /* service connection status */
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A_UINT8 EndpointID; /* assigned endpoint ID */
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A_UINT16 MaxMsgSize; /* maximum expected message size on this endpoint */
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A_UINT8 ServiceMetaLength; /* length of meta data that follows */
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A_UINT8 _Pad1;
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/* service-specific meta data starts after the header */
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} POSTPACK HTC_CONNECT_SERVICE_RESPONSE_MSG;
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typedef PREPACK struct {
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A_UINT16 MessageID;
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/* currently, no other fields */
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} POSTPACK HTC_SETUP_COMPLETE_MSG;
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/* connect response status codes */
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#define HTC_SERVICE_SUCCESS 0 /* success */
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#define HTC_SERVICE_NOT_FOUND 1 /* service could not be found */
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#define HTC_SERVICE_FAILED 2 /* specific service failed the connect */
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#define HTC_SERVICE_NO_RESOURCES 3 /* no resources (i.e. no more endpoints) */
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#define HTC_SERVICE_NO_MORE_EP 4 /* specific service is not allowing any more
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endpoints */
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/* report record IDs */
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typedef enum {
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HTC_RECORD_NULL = 0,
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HTC_RECORD_CREDITS = 1,
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HTC_RECORD_LOOKAHEAD = 2,
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} HTC_RPT_IDS;
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typedef PREPACK struct {
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A_UINT8 RecordID; /* Record ID */
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A_UINT8 Length; /* Length of record */
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} POSTPACK HTC_RECORD_HDR;
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typedef PREPACK struct {
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A_UINT8 EndpointID; /* Endpoint that owns these credits */
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A_UINT8 Credits; /* credits to report since last report */
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} POSTPACK HTC_CREDIT_REPORT;
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typedef PREPACK struct {
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A_UINT8 PreValid; /* pre valid guard */
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A_UINT8 LookAhead[4]; /* 4 byte lookahead */
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A_UINT8 PostValid; /* post valid guard */
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/* NOTE: the LookAhead array is guarded by a PreValid and Post Valid guard bytes.
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* The PreValid bytes must equal the inverse of the PostValid byte */
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} POSTPACK HTC_LOOKAHEAD_REPORT;
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#ifndef ATH_TARGET
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#include "athendpack.h"
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#endif
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#endif /* __HTC_H__ */
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