ringbuffer.h

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/* SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright(c) 2019 Intel Corporation. All rights reserved.
 *
 * Author: Marcin Rajwa <marcin.rajwa@linux.intel.com>
 */
 
#ifndef __SOF_DEBUG_GDB_RINGBUFFER_H__
#define __SOF_DEBUG_GDB_RINGBUFFER_H__
 
#include <sof/lib/mailbox.h>
 
#define RING_SIZE 128
#define DEBUG_RX_BASE (mailbox_get_debug_base())
#define DEBUG_TX_BASE (mailbox_get_debug_base() + 0x100)
 
unsigned char get_debug_char(void);
void put_debug_char(unsigned char c);
void put_exception_char(char c);
void init_buffers(void);
struct ring {
    unsigned char head;
    unsigned char fill1[63];
    unsigned char tail;
    unsigned char fill2[63];
    unsigned char data[RING_SIZE];
};
 
static inline unsigned int ring_next_head(const volatile struct ring *ring)
{
    return (ring->head + 1) & (RING_SIZE - 1);
}
 
static inline unsigned int ring_next_tail(const volatile struct ring *ring)
{
    return (ring->tail + 1) & (RING_SIZE - 1);
}
 
static inline int ring_have_space(const volatile struct ring *ring)
{
    return ring_next_head(ring) != ring->tail;
}
 
static inline int ring_have_data(const volatile struct ring *ring)
{
    return ring->head != ring->tail;
}
 
#endif /* __SOF_DEBUG_GDB_RINGBUFFER_H__ */