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112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/*
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* Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
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*
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* This software may be freely used, copied, modified, and distributed
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* provided that the above copyright notice is preserved in all copies of the
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* software.
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*/
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/* -*-C-*-
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*
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* $Revision$
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* $Date$
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*
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*
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* Project: ANGEL
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*
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* Title: Public interface to buffer management
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*/
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#ifndef angel_buffers_h
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#define angel_buffers_h
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#include "chandefs.h" /* CHAN_HEADER_SIZE */
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/* the handle to a buffer */
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typedef unsigned char *p_Buffer;
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/*
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* Angel Packets are structured as a fixed size header, followed
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* by the packet data
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*/
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#ifdef TARGET
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# define BUFFERDATA(b) (b) /* channels layer takes care of it */
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#else
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# define BUFFERDATA(b) (&((b)[CHAN_HEADER_SIZE]))
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#endif
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/*
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* The buffer management function prototypes are only applicable
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* when compiling target code
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*/
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#ifdef TARGET
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/*
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* Function: Angel_BufferQuerySizes
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* Purpose: Request infomation on the default and maximum buffer sizes
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* that can be allocated
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*
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* Params:
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* In/Out: default_size, max_size: pointers to place the
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* sizes in on return
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*/
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void Angel_BufferQuerySizes(unsigned int *default_size,
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unsigned int *max_size );
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/*
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* Function: Angel_RxEnginBuffersLeft
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* Purpose: return the number of free buffers
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*
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* Params:
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* Returns: number of free buffers
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*/
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unsigned int Angel_BuffersLeft( void );
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/*
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* Function: Angel_BufferAlloc
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* Purpose: allocate a buffer that is at least req_size bytes long
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*
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* Params:
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* Input: req_size the required size of the buffer
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*
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* Returns: pointer to the buffer NULL if unable to
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* fulfil the request
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*/
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p_Buffer Angel_BufferAlloc(unsigned int req_size);
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/*
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* Function: Angel_BufferRelease
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* Purpose: release a buffer back to the free pool
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*
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* Params:
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* Input: pointer to the buffer to free
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*/
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void Angel_BufferRelease(p_Buffer buffer);
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/* return values for angel_InitBuffers */
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typedef enum buf_init_error{
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INIT_BUF_OK,
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INIT_BUF_FAIL
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} buf_init_error;
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/*
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* Function: Angel_InitBuffers
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* Purpose: Initalised and malloc the buffer pool
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*
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* Params:
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* Returns: see above
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*/
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buf_init_error Angel_InitBuffers(void);
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#endif /* def TARGET */
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#endif /* ndef angel_buffers_h */
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/* EOF buffers.h */
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