acrn-hypervisor/hypervisor/include/debug/sbuf.h

72 lines
1.8 KiB
C

/*
* SHARED BUFFER
*
* Copyright (C) 2017 Intel Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*
* Li Fei <fei1.li@intel.com>
*
*/
#ifndef SHARED_BUFFER_H
#define SHARED_BUFFER_H
#define SBUF_MAGIC 0x5aa57aa71aa13aa3UL
#define SBUF_MAX_SIZE (1UL << 22U)
#define SBUF_HEAD_SIZE 64U
/* sbuf flags */
#define OVERRUN_CNT_EN (1U << 0U) /* whether overrun counting is enabled */
#define OVERWRITE_EN (1U << 1U) /* whether overwrite is enabled */
/**
* (sbuf) head + buf (store (ele_num - 1) elements at most)
* buffer empty: tail == head
* buffer full: (tail + ele_size) % size == head
*
* Base of memory for elements
* |
* |
* ----------------------------------------------------------------------
* | struct shared_buf | raw data (ele_size)| ... | raw data (ele_size) |
* ----------------------------------------------------------------------
* |
* |
* struct shared_buf *buf
*/
enum {
ACRN_TRACE = 0U,
ACRN_HVLOG,
ACRN_SEP,
ACRN_SOCWATCH,
ACRN_SBUF_ID_MAX,
};
/* Make sure sizeof(struct shared_buf) == SBUF_HEAD_SIZE */
struct shared_buf {
uint64_t magic;
uint32_t ele_num; /* number of elements */
uint32_t ele_size; /* sizeof of elements */
uint32_t head; /* offset from base, to read */
uint32_t tail; /* offset from base, to write */
uint32_t flags;
uint32_t reserved;
uint32_t overrun_cnt; /* count of overrun */
uint32_t size; /* ele_num * ele_size */
uint32_t padding[6];
};
/**
*@pre sbuf != NULL
*@pre data != NULL
*/
uint32_t sbuf_put(struct shared_buf *sbuf, uint8_t *data);
int32_t sbuf_share_setup(uint16_t pcpu_id, uint32_t sbuf_id, uint64_t *hva);
void sbuf_reset(void);
uint32_t sbuf_next_ptr(uint32_t pos, uint32_t span, uint32_t scope);
#endif /* SHARED_BUFFER_H */