mirror of
https://source.denx.de/u-boot/u-boot.git
synced 2025-10-31 08:21:36 +01:00
388 lines
12 KiB
C
388 lines
12 KiB
C
|
|
/******************************************************************************/
|
|
/* */
|
|
/* Broadcom BCM5700 Linux Network Driver, Copyright (c) 2000 Broadcom */
|
|
/* Corporation. */
|
|
/* All rights reserved. */
|
|
/* */
|
|
/* This program is free software; you can redistribute it and/or modify */
|
|
/* it under the terms of the GNU General Public License as published by */
|
|
/* the Free Software Foundation, located in the file LICENSE. */
|
|
/* */
|
|
/* Queue functions. */
|
|
/* void QQ_InitQueue(PQQ_CONTAINER pQueue) */
|
|
/* char QQ_Full(PQQ_CONTAINER pQueue) */
|
|
/* char QQ_Empty(PQQ_CONTAINER pQueue) */
|
|
/* unsigned int QQ_GetSize(PQQ_CONTAINER pQueue) */
|
|
/* unsigned int QQ_GetEntryCnt(PQQ_CONTAINER pQueue) */
|
|
/* char QQ_PushHead(PQQ_CONTAINER pQueue, PQQ_ENTRY pEntry) */
|
|
/* char QQ_PushTail(PQQ_CONTAINER pQueue, PQQ_ENTRY pEntry) */
|
|
/* PQQ_ENTRY QQ_PopHead(PQQ_CONTAINER pQueue) */
|
|
/* PQQ_ENTRY QQ_PopTail(PQQ_CONTAINER pQueue) */
|
|
/* PQQ_ENTRY QQ_GetHead(PQQ_CONTAINER pQueue, unsigned int Idx) */
|
|
/* PQQ_ENTRY QQ_GetTail(PQQ_CONTAINER pQueue, unsigned int Idx) */
|
|
/* */
|
|
/* */
|
|
/* History: */
|
|
/* 02/25/00 Hav Khauv Initial version. */
|
|
/******************************************************************************/
|
|
|
|
#ifndef BCM_QUEUE_H
|
|
#define BCM_QUEUE_H
|
|
#ifndef EMBEDDED
|
|
#define EMBEDDED 1
|
|
#endif
|
|
|
|
/******************************************************************************/
|
|
/* Queue definitions. */
|
|
/******************************************************************************/
|
|
|
|
/* Entry for queueing. */
|
|
typedef void *PQQ_ENTRY;
|
|
|
|
/* Linux Atomic Ops support */
|
|
typedef struct { int counter; } atomic_t;
|
|
|
|
|
|
/*
|
|
* This combination of `inline' and `extern' has almost the effect of a
|
|
* macro. The way to use it is to put a function definition in a header
|
|
* file with these keywords, and put another copy of the definition
|
|
* (lacking `inline' and `extern') in a library file. The definition in
|
|
* the header file will cause most calls to the function to be inlined.
|
|
* If any uses of the function remain, they will refer to the single copy
|
|
* in the library.
|
|
*/
|
|
extern __inline void
|
|
atomic_set(atomic_t* entry, int val)
|
|
{
|
|
entry->counter = val;
|
|
}
|
|
extern __inline int
|
|
atomic_read(atomic_t* entry)
|
|
{
|
|
return entry->counter;
|
|
}
|
|
extern __inline void
|
|
atomic_inc(atomic_t* entry)
|
|
{
|
|
if(entry)
|
|
entry->counter++;
|
|
}
|
|
|
|
extern __inline void
|
|
atomic_dec(atomic_t* entry)
|
|
{
|
|
if(entry)
|
|
entry->counter--;
|
|
}
|
|
|
|
extern __inline void
|
|
atomic_sub(int a, atomic_t* entry)
|
|
{
|
|
if(entry)
|
|
entry->counter -= a;
|
|
}
|
|
extern __inline void
|
|
atomic_add(int a, atomic_t* entry)
|
|
{
|
|
if(entry)
|
|
entry->counter += a;
|
|
}
|
|
|
|
|
|
/* Queue header -- base type. */
|
|
typedef struct {
|
|
unsigned int Head;
|
|
unsigned int Tail;
|
|
unsigned int Size;
|
|
atomic_t EntryCnt;
|
|
PQQ_ENTRY Array[1];
|
|
} QQ_CONTAINER, *PQQ_CONTAINER;
|
|
|
|
|
|
/* Declare queue type macro. */
|
|
#define DECLARE_QUEUE_TYPE(_QUEUE_TYPE, _QUEUE_SIZE) \
|
|
\
|
|
typedef struct { \
|
|
QQ_CONTAINER Container; \
|
|
PQQ_ENTRY EntryBuffer[_QUEUE_SIZE]; \
|
|
} _QUEUE_TYPE, *P##_QUEUE_TYPE
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Compilation switches. */
|
|
/******************************************************************************/
|
|
|
|
#if DBG
|
|
#undef QQ_NO_OVERFLOW_CHECK
|
|
#undef QQ_NO_UNDERFLOW_CHECK
|
|
#endif /* DBG */
|
|
|
|
#ifdef QQ_USE_MACROS
|
|
/* notdone */
|
|
#else
|
|
|
|
#ifdef QQ_NO_INLINE
|
|
#define __inline
|
|
#endif /* QQ_NO_INLINE */
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/******************************************************************************/
|
|
extern __inline void
|
|
QQ_InitQueue(
|
|
PQQ_CONTAINER pQueue,
|
|
unsigned int QueueSize) {
|
|
pQueue->Head = 0;
|
|
pQueue->Tail = 0;
|
|
pQueue->Size = QueueSize+1;
|
|
atomic_set(&pQueue->EntryCnt, 0);
|
|
} /* QQ_InitQueue */
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/******************************************************************************/
|
|
extern __inline char
|
|
QQ_Full(
|
|
PQQ_CONTAINER pQueue) {
|
|
unsigned int NewHead;
|
|
|
|
NewHead = (pQueue->Head + 1) % pQueue->Size;
|
|
|
|
return(NewHead == pQueue->Tail);
|
|
} /* QQ_Full */
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/******************************************************************************/
|
|
extern __inline char
|
|
QQ_Empty(
|
|
PQQ_CONTAINER pQueue) {
|
|
return(pQueue->Head == pQueue->Tail);
|
|
} /* QQ_Empty */
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/******************************************************************************/
|
|
extern __inline unsigned int
|
|
QQ_GetSize(
|
|
PQQ_CONTAINER pQueue) {
|
|
return pQueue->Size;
|
|
} /* QQ_GetSize */
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/******************************************************************************/
|
|
extern __inline unsigned int
|
|
QQ_GetEntryCnt(
|
|
PQQ_CONTAINER pQueue) {
|
|
return atomic_read(&pQueue->EntryCnt);
|
|
} /* QQ_GetEntryCnt */
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/* TRUE entry was added successfully. */
|
|
/* FALSE queue is full. */
|
|
/******************************************************************************/
|
|
extern __inline char
|
|
QQ_PushHead(
|
|
PQQ_CONTAINER pQueue,
|
|
PQQ_ENTRY pEntry) {
|
|
unsigned int Head;
|
|
|
|
Head = (pQueue->Head + 1) % pQueue->Size;
|
|
|
|
#if !defined(QQ_NO_OVERFLOW_CHECK)
|
|
if(Head == pQueue->Tail) {
|
|
return 0;
|
|
} /* if */
|
|
#endif /* QQ_NO_OVERFLOW_CHECK */
|
|
|
|
pQueue->Array[pQueue->Head] = pEntry;
|
|
wmb();
|
|
pQueue->Head = Head;
|
|
atomic_inc(&pQueue->EntryCnt);
|
|
|
|
return -1;
|
|
} /* QQ_PushHead */
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/* TRUE entry was added successfully. */
|
|
/* FALSE queue is full. */
|
|
/******************************************************************************/
|
|
extern __inline char
|
|
QQ_PushTail(
|
|
PQQ_CONTAINER pQueue,
|
|
PQQ_ENTRY pEntry) {
|
|
unsigned int Tail;
|
|
|
|
Tail = pQueue->Tail;
|
|
if(Tail == 0) {
|
|
Tail = pQueue->Size;
|
|
} /* if */
|
|
Tail--;
|
|
|
|
#if !defined(QQ_NO_OVERFLOW_CHECK)
|
|
if(Tail == pQueue->Head) {
|
|
return 0;
|
|
} /* if */
|
|
#endif /* QQ_NO_OVERFLOW_CHECK */
|
|
|
|
pQueue->Array[Tail] = pEntry;
|
|
wmb();
|
|
pQueue->Tail = Tail;
|
|
atomic_inc(&pQueue->EntryCnt);
|
|
|
|
return -1;
|
|
} /* QQ_PushTail */
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/******************************************************************************/
|
|
extern __inline PQQ_ENTRY
|
|
QQ_PopHead(
|
|
PQQ_CONTAINER pQueue) {
|
|
unsigned int Head;
|
|
PQQ_ENTRY Entry;
|
|
|
|
Head = pQueue->Head;
|
|
|
|
#if !defined(QQ_NO_UNDERFLOW_CHECK)
|
|
if(Head == pQueue->Tail) {
|
|
return (PQQ_ENTRY) 0;
|
|
} /* if */
|
|
#endif /* QQ_NO_UNDERFLOW_CHECK */
|
|
|
|
if(Head == 0) {
|
|
Head = pQueue->Size;
|
|
} /* if */
|
|
Head--;
|
|
|
|
Entry = pQueue->Array[Head];
|
|
#ifdef EMBEDDED
|
|
membar();
|
|
#else
|
|
mb();
|
|
#endif
|
|
pQueue->Head = Head;
|
|
atomic_dec(&pQueue->EntryCnt);
|
|
|
|
return Entry;
|
|
} /* QQ_PopHead */
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/******************************************************************************/
|
|
extern __inline PQQ_ENTRY
|
|
QQ_PopTail(
|
|
PQQ_CONTAINER pQueue) {
|
|
unsigned int Tail;
|
|
PQQ_ENTRY Entry;
|
|
|
|
Tail = pQueue->Tail;
|
|
|
|
#if !defined(QQ_NO_UNDERFLOW_CHECK)
|
|
if(Tail == pQueue->Head) {
|
|
return (PQQ_ENTRY) 0;
|
|
} /* if */
|
|
#endif /* QQ_NO_UNDERFLOW_CHECK */
|
|
|
|
Entry = pQueue->Array[Tail];
|
|
#ifdef EMBEDDED
|
|
membar();
|
|
#else
|
|
mb();
|
|
#endif
|
|
pQueue->Tail = (Tail + 1) % pQueue->Size;
|
|
atomic_dec(&pQueue->EntryCnt);
|
|
|
|
return Entry;
|
|
} /* QQ_PopTail */
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/******************************************************************************/
|
|
extern __inline PQQ_ENTRY
|
|
QQ_GetHead(
|
|
PQQ_CONTAINER pQueue,
|
|
unsigned int Idx)
|
|
{
|
|
if(Idx >= atomic_read(&pQueue->EntryCnt))
|
|
{
|
|
return (PQQ_ENTRY) 0;
|
|
}
|
|
|
|
if(pQueue->Head > Idx)
|
|
{
|
|
Idx = pQueue->Head - Idx;
|
|
}
|
|
else
|
|
{
|
|
Idx = pQueue->Size - (Idx - pQueue->Head);
|
|
}
|
|
Idx--;
|
|
|
|
return pQueue->Array[Idx];
|
|
}
|
|
|
|
|
|
/******************************************************************************/
|
|
/* Description: */
|
|
/* */
|
|
/* Return: */
|
|
/******************************************************************************/
|
|
extern __inline PQQ_ENTRY
|
|
QQ_GetTail(
|
|
PQQ_CONTAINER pQueue,
|
|
unsigned int Idx)
|
|
{
|
|
if(Idx >= atomic_read(&pQueue->EntryCnt))
|
|
{
|
|
return (PQQ_ENTRY) 0;
|
|
}
|
|
|
|
Idx += pQueue->Tail;
|
|
if(Idx >= pQueue->Size)
|
|
{
|
|
Idx = Idx - pQueue->Size;
|
|
}
|
|
|
|
return pQueue->Array[Idx];
|
|
}
|
|
|
|
#endif /* QQ_USE_MACROS */
|
|
|
|
|
|
#endif /* QUEUE_H */
|