feat: start setup virtio
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21
include/endian.h
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21
include/endian.h
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//
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// Created by rick on 14-5-22.
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//
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#ifndef NEW_KERNEL_ENDIAN_H
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#define NEW_KERNEL_ENDIAN_H
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#include <stdint.h>
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define leu16_to_native(x) x
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#define leu32_to_native(x) x
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#else
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#define leu16_to_native(x) ((x) >> 8 | (x) << 8)
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#define leu32_to_native(x) (((x)>>24)&0xff) | \
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(((x)<<8)&0xff0000) | \
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(((x)>>8)&0xff00) | \
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(((x)<<24)&0xff000000)
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#endif
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#endif //NEW_KERNEL_ENDIAN_H
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@@ -14,7 +14,8 @@
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#define PCI_CLASS_BRIDGE 0x06
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// class MASS STORAGE 0x01
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#define PCI_SUB_CLASS_IDE 0x01
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#define PCI_SUB_CLASS_MASS_SCSI 0x00
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#define PCI_SUB_CLASS_MASS_IDE 0x01
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// class BRIDGE 0x06
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#define PCI_SUB_CLASS_PCI_PCI_BRIDGE_4 0x04
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18
include/myke/drivers/pci/virtio.h
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18
include/myke/drivers/pci/virtio.h
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//
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// Created by rick on 14-5-22.
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//
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#ifndef NEW_KERNEL_VIRTIO_H
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#define NEW_KERNEL_VIRTIO_H
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#define PCI_VENDOR_VIRTIO 0x1af4
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#define PCI_DEVICE_VIRTIO_NETWORK 0x1000
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#define PCI_DEVICE_VIRTIO_BLOCK 0x1001
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#define PCI_DEVICE_VIRTIO_BALLOON 0x1002
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#define PCI_DEVICE_VIRTIO_CONSOLE 0x1003
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#define PCI_DEVICE_VIRTIO_SCSI 0x1004
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#define PCI_DEVICE_VIRTIO_ENTROPY 0x1005
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#define PCI_DEVICE_VIRTIO_9P 0x1009
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#endif //NEW_KERNEL_VIRTIO_H
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103
include/virtio_queue.h
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103
include/virtio_queue.h
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#ifndef VIRTQUEUE_H
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#define VIRTQUEUE_H
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/*
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* Virtual I/O Device (VIRTIO) Version 1.2
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* Committee Specification Draft 01
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* 09 May 2022
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* Copyright (c) OASIS Open 2022. All Rights Reserved.
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* Source: http://docs.oasis-open.org/virtio/virtio/v1.2/csd01/listings/
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* Latest stage of narrative specification: http://docs.oasis-open.org/virtio/virtio/v1.2/virtio-v1.2.html
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* TC IPR Statement: https://github.com/oasis-tcs/virtio-admin/blob/master/IPR.md
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*/
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/*
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* An interface for efficient virtio implementation.
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*/
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#include <stdint.h>
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/* This marks a buffer as continuing via the next field. */
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#define VIRTQ_DESC_F_NEXT 1
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/* This marks a buffer as write-only (otherwise read-only). */
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#define VIRTQ_DESC_F_WRITE 2
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/* This means the buffer contains a list of buffer descriptors. */
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#define VIRTQ_DESC_F_INDIRECT 4
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/* The device uses this in used->flags to advise the driver: don't kick me
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* when you add a buffer. It's unreliable, so it's simply an
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* optimization. */
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#define VIRTQ_USED_F_NO_NOTIFY 1
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/* The driver uses this in avail->flags to advise the device: don't
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* interrupt me when you consume a buffer. It's unreliable, so it's
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* simply an optimization. */
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#define VIRTQ_AVAIL_F_NO_INTERRUPT 1
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/* Support for indirect descriptors */
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#define VIRTIO_F_INDIRECT_DESC 28
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/* Support for avail_event and used_event fields */
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#define VIRTIO_F_EVENT_IDX 29
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/* Arbitrary descriptor layouts. */
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#define VIRTIO_F_ANY_LAYOUT 27
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/* Virtqueue descriptors: 16 bytes.
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* These can chain together via "next". */
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struct virtq_desc {
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/* Address (guest-physical). */
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le64 addr;
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/* Length. */
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le32 len;
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/* The flags as indicated above. */
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le16 flags;
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/* We chain unused descriptors via this, too */
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le16 next;
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};
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struct virtq_avail {
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le16 flags;
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le16 idx;
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le16 ring[];
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/* Only if VIRTIO_F_EVENT_IDX: le16 used_event; */
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};
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/* le32 is used here for ids for padding reasons. */
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struct virtq_used_elem {
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/* Index of start of used descriptor chain. */
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le32 id;
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/* Total length of the descriptor chain which was written to. */
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le32 len;
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};
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struct virtq_used {
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le16 flags;
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le16 idx;
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struct virtq_used_elem ring[];
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/* Only if VIRTIO_F_EVENT_IDX: le16 avail_event; */
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};
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struct virtq {
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unsigned int num;
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struct virtq_desc *desc;
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struct virtq_avail *avail;
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struct virtq_used *used;
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};
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static inline int virtq_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old_idx)
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{
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return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old_idx);
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}
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/* Get location of event indices (only with VIRTIO_F_EVENT_IDX) */
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static inline le16 *virtq_used_event(struct virtq *vq)
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{
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/* For backwards compat, used event index is at *end* of avail ring. */
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return &vq->avail->ring[vq->num];
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}
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static inline le16 *virtq_avail_event(struct virtq *vq)
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{
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/* For backwards compat, avail event index is at *end* of used ring. */
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return (le16 *)&vq->used->ring[vq->num];
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}
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#endif /* VIRTQUEUE_H */
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