61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-9-16 GuEe-GUI the first version
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*/
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#ifndef VIRTIO_H__
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#define VIRTIO_H__
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#include <stdint.h>
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#define PAGE_SIZE 4096
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#define PAGE_SHIFT 12
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#define VIRTIO_STAT_ACKNOWLEDGE 1
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#define VIRTIO_STAT_DRIVER 2
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#define VIRTIO_STAT_DRIVER_OK 4
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#define VIRTIO_STAT_FEATURES_OK 8
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#define VIRTIO_STAT_NEEDS_RESET 64
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#define VIRTIO_STAT_FAILED 128
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#define QUEUE_SIZE 8
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struct virtq_desc
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{
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uint64_t addr;
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uint32_t len;
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uint16_t flags;
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uint16_t next;
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};
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#define VRING_DESC_F_NEXT 1 // chained with another descriptor
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#define VRING_DESC_F_WRITE 2 // device writes (vs read)
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struct virtq_avail
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{
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uint16_t flags; // always zero
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uint16_t idx; // driver will write ring[idx] next
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uint16_t ring[QUEUE_SIZE]; // descriptor numbers of chain heads
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uint16_t unused;
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};
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struct virtq_used_elem
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{
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uint32_t id; // index of start of completed descriptor chain
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uint32_t len;
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};
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struct virtq_used
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{
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uint16_t flags; // always zero
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uint16_t idx; // device increments when it adds a ring[] entry
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struct virtq_used_elem ring[QUEUE_SIZE];
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};
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#endif /* VIRTIO_H__ */
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