mirror of
https://github.com/AsahiLinux/u-boot
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387 lines
12 KiB
C
387 lines
12 KiB
C
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/******************************************************************************/
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/* */
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/* Broadcom BCM5700 Linux Network Driver, Copyright (c) 2000 Broadcom */
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/* Corporation. */
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/* All rights reserved. */
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/* */
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/* This program is free software; you can redistribute it and/or modify */
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/* it under the terms of the GNU General Public License as published by */
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/* the Free Software Foundation, located in the file LICENSE. */
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/* */
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/* Queue functions. */
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/* void QQ_InitQueue(PQQ_CONTAINER pQueue) */
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/* char QQ_Full(PQQ_CONTAINER pQueue) */
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/* char QQ_Empty(PQQ_CONTAINER pQueue) */
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/* unsigned int QQ_GetSize(PQQ_CONTAINER pQueue) */
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/* unsigned int QQ_GetEntryCnt(PQQ_CONTAINER pQueue) */
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/* char QQ_PushHead(PQQ_CONTAINER pQueue, PQQ_ENTRY pEntry) */
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/* char QQ_PushTail(PQQ_CONTAINER pQueue, PQQ_ENTRY pEntry) */
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/* PQQ_ENTRY QQ_PopHead(PQQ_CONTAINER pQueue) */
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/* PQQ_ENTRY QQ_PopTail(PQQ_CONTAINER pQueue) */
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/* PQQ_ENTRY QQ_GetHead(PQQ_CONTAINER pQueue, unsigned int Idx) */
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/* PQQ_ENTRY QQ_GetTail(PQQ_CONTAINER pQueue, unsigned int Idx) */
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/* */
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/* */
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/* History: */
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/* 02/25/00 Hav Khauv Initial version. */
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/******************************************************************************/
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#ifndef BCM_QUEUE_H
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#define BCM_QUEUE_H
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#ifndef EMBEDDED
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#define EMBEDDED 1
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#endif
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/******************************************************************************/
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/* Queue definitions. */
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/******************************************************************************/
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/* Entry for queueing. */
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typedef void *PQQ_ENTRY;
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/* Linux Atomic Ops support */
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typedef struct { int counter; } atomic_t;
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/*
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* This combination of `inline' and `extern' has almost the effect of a
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* macro. The way to use it is to put a function definition in a header
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* file with these keywords, and put another copy of the definition
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* (lacking `inline' and `extern') in a library file. The definition in
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* the header file will cause most calls to the function to be inlined.
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* If any uses of the function remain, they will refer to the single copy
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* in the library.
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*/
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extern __inline void
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atomic_set(atomic_t* entry, int val)
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{
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entry->counter = val;
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}
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extern __inline int
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atomic_read(atomic_t* entry)
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{
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return entry->counter;
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}
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extern __inline void
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atomic_inc(atomic_t* entry)
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{
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if(entry)
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entry->counter++;
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}
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extern __inline void
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atomic_dec(atomic_t* entry)
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{
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if(entry)
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entry->counter--;
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}
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extern __inline void
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atomic_sub(int a, atomic_t* entry)
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{
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if(entry)
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entry->counter -= a;
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}
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extern __inline void
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atomic_add(int a, atomic_t* entry)
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{
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if(entry)
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entry->counter += a;
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}
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/* Queue header -- base type. */
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typedef struct {
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unsigned int Head;
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unsigned int Tail;
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unsigned int Size;
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atomic_t EntryCnt;
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PQQ_ENTRY Array[1];
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} QQ_CONTAINER, *PQQ_CONTAINER;
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/* Declare queue type macro. */
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#define DECLARE_QUEUE_TYPE(_QUEUE_TYPE, _QUEUE_SIZE) \
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\
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typedef struct { \
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QQ_CONTAINER Container; \
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PQQ_ENTRY EntryBuffer[_QUEUE_SIZE]; \
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} _QUEUE_TYPE, *P##_QUEUE_TYPE
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/******************************************************************************/
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/* Compilation switches. */
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/******************************************************************************/
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#if DBG
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#undef QQ_NO_OVERFLOW_CHECK
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#undef QQ_NO_UNDERFLOW_CHECK
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#endif /* DBG */
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#ifdef QQ_USE_MACROS
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/* notdone */
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#else
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#ifdef QQ_NO_INLINE
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#define __inline
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#endif /* QQ_NO_INLINE */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/******************************************************************************/
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extern __inline void
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QQ_InitQueue(
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PQQ_CONTAINER pQueue,
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unsigned int QueueSize) {
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pQueue->Head = 0;
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pQueue->Tail = 0;
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pQueue->Size = QueueSize+1;
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atomic_set(&pQueue->EntryCnt, 0);
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} /* QQ_InitQueue */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/******************************************************************************/
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extern __inline char
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QQ_Full(
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PQQ_CONTAINER pQueue) {
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unsigned int NewHead;
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NewHead = (pQueue->Head + 1) % pQueue->Size;
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return(NewHead == pQueue->Tail);
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} /* QQ_Full */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/******************************************************************************/
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extern __inline char
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QQ_Empty(
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PQQ_CONTAINER pQueue) {
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return(pQueue->Head == pQueue->Tail);
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} /* QQ_Empty */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/******************************************************************************/
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extern __inline unsigned int
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QQ_GetSize(
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PQQ_CONTAINER pQueue) {
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return pQueue->Size;
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} /* QQ_GetSize */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/******************************************************************************/
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extern __inline unsigned int
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QQ_GetEntryCnt(
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PQQ_CONTAINER pQueue) {
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return atomic_read(&pQueue->EntryCnt);
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} /* QQ_GetEntryCnt */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/* TRUE entry was added successfully. */
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/* FALSE queue is full. */
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/******************************************************************************/
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extern __inline char
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QQ_PushHead(
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PQQ_CONTAINER pQueue,
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PQQ_ENTRY pEntry) {
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unsigned int Head;
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Head = (pQueue->Head + 1) % pQueue->Size;
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#if !defined(QQ_NO_OVERFLOW_CHECK)
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if(Head == pQueue->Tail) {
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return 0;
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} /* if */
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#endif /* QQ_NO_OVERFLOW_CHECK */
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pQueue->Array[pQueue->Head] = pEntry;
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wmb();
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pQueue->Head = Head;
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atomic_inc(&pQueue->EntryCnt);
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return -1;
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} /* QQ_PushHead */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/* TRUE entry was added successfully. */
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/* FALSE queue is full. */
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/******************************************************************************/
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extern __inline char
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QQ_PushTail(
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PQQ_CONTAINER pQueue,
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PQQ_ENTRY pEntry) {
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unsigned int Tail;
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Tail = pQueue->Tail;
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if(Tail == 0) {
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Tail = pQueue->Size;
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} /* if */
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Tail--;
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#if !defined(QQ_NO_OVERFLOW_CHECK)
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if(Tail == pQueue->Head) {
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return 0;
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} /* if */
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#endif /* QQ_NO_OVERFLOW_CHECK */
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pQueue->Array[Tail] = pEntry;
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wmb();
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pQueue->Tail = Tail;
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atomic_inc(&pQueue->EntryCnt);
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return -1;
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} /* QQ_PushTail */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/******************************************************************************/
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extern __inline PQQ_ENTRY
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QQ_PopHead(
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PQQ_CONTAINER pQueue) {
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unsigned int Head;
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PQQ_ENTRY Entry;
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Head = pQueue->Head;
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#if !defined(QQ_NO_UNDERFLOW_CHECK)
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if(Head == pQueue->Tail) {
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return (PQQ_ENTRY) 0;
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} /* if */
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#endif /* QQ_NO_UNDERFLOW_CHECK */
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if(Head == 0) {
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Head = pQueue->Size;
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} /* if */
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Head--;
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Entry = pQueue->Array[Head];
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#ifdef EMBEDDED
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membar();
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#else
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mb();
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#endif
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pQueue->Head = Head;
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atomic_dec(&pQueue->EntryCnt);
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return Entry;
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} /* QQ_PopHead */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/******************************************************************************/
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extern __inline PQQ_ENTRY
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QQ_PopTail(
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PQQ_CONTAINER pQueue) {
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unsigned int Tail;
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PQQ_ENTRY Entry;
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Tail = pQueue->Tail;
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#if !defined(QQ_NO_UNDERFLOW_CHECK)
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if(Tail == pQueue->Head) {
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return (PQQ_ENTRY) 0;
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} /* if */
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#endif /* QQ_NO_UNDERFLOW_CHECK */
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Entry = pQueue->Array[Tail];
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#ifdef EMBEDDED
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membar();
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#else
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mb();
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#endif
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pQueue->Tail = (Tail + 1) % pQueue->Size;
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atomic_dec(&pQueue->EntryCnt);
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return Entry;
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} /* QQ_PopTail */
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/******************************************************************************/
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extern __inline PQQ_ENTRY
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QQ_GetHead(
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PQQ_CONTAINER pQueue,
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unsigned int Idx)
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{
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if(Idx >= atomic_read(&pQueue->EntryCnt))
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{
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return (PQQ_ENTRY) 0;
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}
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if(pQueue->Head > Idx)
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{
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Idx = pQueue->Head - Idx;
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}
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else
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{
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Idx = pQueue->Size - (Idx - pQueue->Head);
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}
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Idx--;
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return pQueue->Array[Idx];
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}
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/******************************************************************************/
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/* Description: */
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/* */
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/* Return: */
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/******************************************************************************/
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extern __inline PQQ_ENTRY
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QQ_GetTail(
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PQQ_CONTAINER pQueue,
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unsigned int Idx)
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{
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if(Idx >= atomic_read(&pQueue->EntryCnt))
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{
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return (PQQ_ENTRY) 0;
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}
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Idx += pQueue->Tail;
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if(Idx >= pQueue->Size)
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{
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Idx = Idx - pQueue->Size;
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}
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return pQueue->Array[Idx];
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}
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#endif /* QQ_USE_MACROS */
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#endif /* QUEUE_H */
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