lk/dev/virtio/virtio_priv.h

/*
 * Copyright (c) 2014 Travis Geiselbrecht
 *
 * Use of this source code is governed by a MIT-style
 * license that can be found in the LICENSE file or at
 * https://opensource.org/licenses/MIT
 */
#pragma once

#include <lk/compiler.h>
#include <stdint.h>

// V1 config
struct virtio_mmio_config {
    /* 0x00 */
    uint32_t magic;
    uint32_t version;
    uint32_t device_id;
    uint32_t vendor_id;
    /* 0x10 */
    uint32_t host_features;
    uint32_t host_features_sel;
    uint32_t __reserved0[2];
    /* 0x20 */
    uint32_t guest_features;
    uint32_t guest_features_sel;
    uint32_t guest_page_size;
    uint32_t __reserved1[1];
    /* 0x30 */
    uint32_t queue_sel;
    uint32_t queue_num_max;
    uint32_t queue_num;
    uint32_t queue_align;
    /* 0x40 */
    uint32_t queue_pfn;
    uint32_t __reserved2[3];
    /* 0x50 */
    uint32_t queue_notify;
    uint32_t __reserved3[3];
    /* 0x60 */
    uint32_t interrupt_status;
    uint32_t interrupt_ack;
    uint32_t __reserved4[2];
    /* 0x70 */
    uint32_t status;
    uint8_t __reserved5[0x8c];
    /* 0x100 */
    uint32_t config[0];
};

STATIC_ASSERT(sizeof(struct virtio_mmio_config) == 0x100);

#define VIRTIO_MMIO_MAGIC 0x74726976 // 'virt'

#define VIRTIO_STATUS_ACKNOWLEDGE (1<<0)
#define VIRTIO_STATUS_DRIVER      (1<<1)
#define VIRTIO_STATUS_DRIVER_OK   (1<<2)
#define VIRTIO_STATUS_FEATURES_OK (1<<3)
#define VIRTIO_STATUS_DEVICE_NEEDS_RESET (1<<6)
#define VIRTIO_STATUS_FAILED      (1<<7)