建立工程，成功创建两个虚拟串口
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ranchuan
176
source/OpenAMP/open-amp/lib/include/openamp/virtio.h
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176
source/OpenAMP/open-amp/lib/include/openamp/virtio.h
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/*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* $FreeBSD$
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*/
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#ifndef _VIRTIO_H_
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#define _VIRTIO_H_
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#include <openamp/virtqueue.h>
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#include <metal/spinlock.h>
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#if defined __cplusplus
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extern "C" {
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#endif
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/* TODO: define this as compiler flags */
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#ifndef VIRTIO_MAX_NUM_VRINGS
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#define VIRTIO_MAX_NUM_VRINGS 2
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#endif
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/* VirtIO device IDs. */
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#define VIRTIO_ID_NETWORK 0x01UL
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#define VIRTIO_ID_BLOCK 0x02UL
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#define VIRTIO_ID_CONSOLE 0x03UL
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#define VIRTIO_ID_ENTROPY 0x04UL
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#define VIRTIO_ID_BALLOON 0x05UL
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#define VIRTIO_ID_IOMEMORY 0x06UL
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#define VIRTIO_ID_RPMSG 0x07UL /* remote processor messaging */
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#define VIRTIO_ID_SCSI 0x08UL
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#define VIRTIO_ID_9P 0x09UL
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#define VIRTIO_DEV_ANY_ID (-1)UL
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/* Status byte for guest to report progress. */
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#define VIRTIO_CONFIG_STATUS_ACK 0x01
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#define VIRTIO_CONFIG_STATUS_DRIVER 0x02
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#define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
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#define VIRTIO_CONFIG_STATUS_NEEDS_RESET 0x40
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#define VIRTIO_CONFIG_STATUS_FAILED 0x80
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/* Virtio device role */
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#define VIRTIO_DEV_MASTER 0UL
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#define VIRTIO_DEV_SLAVE 1UL
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struct virtio_device_id {
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uint32_t device;
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uint32_t vendor;
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};
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/*
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* Generate interrupt when the virtqueue ring is
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* completely used, even if we've suppressed them.
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*/
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#define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24)
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/*
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* The guest should never negotiate this feature; it
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* is used to detect faulty drivers.
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*/
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#define VIRTIO_F_BAD_FEATURE (1 << 30)
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/*
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* Some VirtIO feature bits (currently bits 28 through 31) are
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* reserved for the transport being used (eg. virtio_ring), the
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* rest are per-device feature bits.
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*/
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#define VIRTIO_TRANSPORT_F_START 28
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#define VIRTIO_TRANSPORT_F_END 32
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typedef void (*virtio_dev_reset_cb)(struct virtio_device *vdev);
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struct virtio_dispatch;
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struct virtio_feature_desc {
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uint32_t vfd_val;
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const char *vfd_str;
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};
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/**
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* struct proc_shm
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*
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* This structure is maintained by hardware interface layer for
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* shared memory information. The shared memory provides buffers
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* for use by the vring to exchange messages between the cores.
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*
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*/
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struct virtio_buffer_info {
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/* Start address of shared memory used for buffers. */
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void *vaddr;
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/* Start physical address of shared memory used for buffers. */
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metal_phys_addr_t paddr;
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/* sharmed memory I/O region */
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struct metal_io_region *io;
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/* Size of shared memory. */
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unsigned long size;
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};
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/**
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* struct remoteproc_vring - remoteproc vring structure
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* @vq virtio queue
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* @va logical address
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* @notifyid vring notify id
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* @num_descs number of descriptors
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* @align vring alignment
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* @io metal I/O region of the vring memory, can be NULL
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*/
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struct virtio_vring_info {
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struct virtqueue *vq;
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struct vring_alloc_info info;
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uint32_t notifyid;
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struct metal_io_region *io;
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};
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/*
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* Structure definition for virtio devices for use by the
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* applications/drivers
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*/
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struct virtio_device {
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uint32_t index; /**< unique position on the virtio bus */
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struct virtio_device_id id; /**< the device type identification
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* (used to match it with a driver
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*/
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uint64_t features; /**< the features supported by both ends. */
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unsigned int role; /**< if it is virtio backend or front end. */
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virtio_dev_reset_cb reset_cb; /**< user registered device callback */
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const struct virtio_dispatch *func; /**< Virtio dispatch table */
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void *priv; /**< TODO: remove pointer to virtio_device private data */
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unsigned int vrings_num; /**< number of vrings */
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struct virtio_vring_info *vrings_info;
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};
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/*
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* Helper functions.
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*/
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const char *virtio_dev_name(uint16_t devid);
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void virtio_describe(struct virtio_device *dev, const char *msg,
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uint32_t features,
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struct virtio_feature_desc *feature_desc);
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/*
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* Functions for virtio device configuration as defined in Rusty Russell's
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* paper.
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* Drivers are expected to implement these functions in their respective codes.
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*/
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struct virtio_dispatch {
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uint8_t (*get_status)(struct virtio_device *dev);
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void (*set_status)(struct virtio_device *dev, uint8_t status);
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uint32_t (*get_features)(struct virtio_device *dev);
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void (*set_features)(struct virtio_device *dev, uint32_t feature);
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uint32_t (*negotiate_features)(struct virtio_device *dev,
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uint32_t features);
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/*
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* Read/write a variable amount from the device specific (ie, network)
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* configuration region. This region is encoded in the same endian as
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* the guest.
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*/
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void (*read_config)(struct virtio_device *dev, uint32_t offset,
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void *dst, int length);
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void (*write_config)(struct virtio_device *dev, uint32_t offset,
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void *src, int length);
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void (*reset_device)(struct virtio_device *dev);
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void (*notify)(struct virtqueue *vq);
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};
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int virtio_create_virtqueues(struct virtio_device *vdev, unsigned int flags,
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unsigned int nvqs, const char *names[],
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vq_callback *callbacks[]);
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#if defined __cplusplus
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}
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#endif
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#endif /* _VIRTIO_H_ */
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