116 lines
4.5 KiB
C
116 lines
4.5 KiB
C
/*
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* Initialization and support routines for self-booting compressed image.
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*
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* Copyright (C) 1999-2014, Broadcom Corporation
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*
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* Unless you and Broadcom execute a separate written software license
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* agreement governing use of this software, this software is licensed to you
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* under the terms of the GNU General Public License version 2 (the "GPL"),
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* available at http://www.broadcom.com/licenses/GPLv2.php, with the
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* following added to such license:
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*
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* As a special exception, the copyright holders of this software give you
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* permission to link this software with independent modules, and to copy and
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* distribute the resulting executable under terms of your choice, provided that
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* you also meet, for each linked independent module, the terms and conditions of
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* the license of that module. An independent module is a module which is not
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* derived from this software. The special exception does not apply to any
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* modifications of the software.
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*
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* Notwithstanding the above, under no circumstances may you combine this
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* software in any way with any other Broadcom software provided under a license
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* other than the GPL, without Broadcom's express prior written consent.
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*
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* $Id: circularbuf.h 452261 2014-01-29 19:30:23Z $
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*/
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#ifndef __CIRCULARBUF_H_INCLUDED__
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#define __CIRCULARBUF_H_INCLUDED__
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#include <osl.h>
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#include <typedefs.h>
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#include <bcmendian.h>
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/* Enumerations of return values provided by MsgBuf implementation */
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typedef enum {
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CIRCULARBUF_FAILURE = -1,
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CIRCULARBUF_SUCCESS
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} circularbuf_ret_t;
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/* Core circularbuf circular buffer structure */
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typedef struct circularbuf_s
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{
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uint16 depth; /* Depth of circular buffer */
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uint16 r_ptr; /* Read Ptr */
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uint16 w_ptr; /* Write Ptr */
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uint16 e_ptr; /* End Ptr */
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uint16 wp_ptr; /* wp_ptr/pending - scheduled for DMA. But, not yet complete. */
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uint16 rp_ptr; /* rp_ptr/pending - scheduled for DMA. But, not yet complete. */
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uint8 *buf_addr;
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void *mb_ctx;
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void (*mb_ring_bell)(void *ctx);
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} circularbuf_t;
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#define CBUF_ERROR_VAL 0x00000001 /* Error level tracing */
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#define CBUF_TRACE_VAL 0x00000002 /* Function level tracing */
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#define CBUF_INFORM_VAL 0x00000004 /* debug level tracing */
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extern int cbuf_msg_level;
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#define CBUF_ERROR(args) do {if (cbuf_msg_level & CBUF_ERROR_VAL) printf args;} while (0)
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#define CBUF_TRACE(args) do {if (cbuf_msg_level & CBUF_TRACE_VAL) printf args;} while (0)
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#define CBUF_INFO(args) do {if (cbuf_msg_level & CBUF_INFORM_VAL) printf args;} while (0)
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#define CIRCULARBUF_START(x) ((x)->buf_addr)
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#define CIRCULARBUF_WRITE_PTR(x) ((x)->w_ptr)
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#define CIRCULARBUF_READ_PTR(x) ((x)->r_ptr)
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#define CIRCULARBUF_END_PTR(x) ((x)->e_ptr)
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#define circularbuf_debug_print(handle) \
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CBUF_INFO(("%s:%d:\t%p rp=%4d r=%4d wp=%4d w=%4d e=%4d\n", \
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__FUNCTION__, __LINE__, \
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(void *) CIRCULARBUF_START(handle), \
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(int) (handle)->rp_ptr, (int) (handle)->r_ptr, \
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(int) (handle)->wp_ptr, (int) (handle)->w_ptr, \
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(int) (handle)->e_ptr));
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/* Callback registered by application/mail-box with the circularbuf implementation.
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* This will be invoked by the circularbuf implementation when write is complete and
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* ready for informing the peer
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*/
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typedef void (*mb_ring_t)(void *ctx);
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/* Public Functions exposed by circularbuf */
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void
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circularbuf_init(circularbuf_t *handle, void *buf_base_addr, uint16 total_buf_len);
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void
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circularbuf_register_cb(circularbuf_t *handle, mb_ring_t mb_ring_func, void *ctx);
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/* Write Functions */
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void *
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circularbuf_reserve_for_write(circularbuf_t *handle, uint16 size);
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void
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circularbuf_write_complete(circularbuf_t *handle, uint16 bytes_written);
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/* Read Functions */
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void *
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circularbuf_get_read_ptr(circularbuf_t *handle, uint16 *avail_len);
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circularbuf_ret_t
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circularbuf_read_complete(circularbuf_t *handle, uint16 bytes_read);
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/*
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* circularbuf_get_read_ptr() updates rp_ptr by the amount that the consumer
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* is supposed to read. The consumer may not read the entire amount.
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* In such a case, circularbuf_revert_rp_ptr() call follows a corresponding
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* circularbuf_get_read_ptr() call to revert the rp_ptr back to
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* the point till which data has actually been processed.
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* It is not valid if it is preceded by multiple get_read_ptr() calls
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*/
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circularbuf_ret_t
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circularbuf_revert_rp_ptr(circularbuf_t *handle, uint16 bytes);
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#endif /* __CIRCULARBUF_H_INCLUDED__ */
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