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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2026 Richard QIn
*/
#pragma once
#include "common/types.h"
// VirtIO MMIO Base Address
#define VIRTIO0 0x10001000
// MMIO Registers (Modern / Version 2)
#define VIRTIO_MMIO_MAGIC_VALUE 0x000
#define VIRTIO_MMIO_VERSION 0x004
#define VIRTIO_MMIO_DEVICE_ID 0x008
#define VIRTIO_MMIO_VENDOR_ID 0x00c
#define VIRTIO_MMIO_DEVICE_FEATURES 0x010
#define VIRTIO_MMIO_DEVICE_FEATURES_SEL 0x014
#define VIRTIO_MMIO_DRIVER_FEATURES 0x020
#define VIRTIO_MMIO_DRIVER_FEATURES_SEL 0x024
#define VIRTIO_MMIO_QUEUE_SEL 0x030
#define VIRTIO_MMIO_QUEUE_NUM_MAX 0x034
#define VIRTIO_MMIO_QUEUE_NUM 0x038
#define VIRTIO_MMIO_QUEUE_READY 0x044
#define VIRTIO_MMIO_QUEUE_NOTIFY 0x050
#define VIRTIO_MMIO_INTERRUPT_STATUS 0x060
#define VIRTIO_MMIO_INTERRUPT_ACK 0x064
#define VIRTIO_MMIO_STATUS 0x070
// 64-bit Queue Address Registers (Modern)
#define VIRTIO_MMIO_QUEUE_DESC_LOW 0x080
#define VIRTIO_MMIO_QUEUE_DESC_HIGH 0x084
#define VIRTIO_MMIO_QUEUE_DRIVER_LOW 0x090
#define VIRTIO_MMIO_QUEUE_DRIVER_HIGH 0x094
#define VIRTIO_MMIO_QUEUE_DEVICE_LOW 0x0a0
#define VIRTIO_MMIO_QUEUE_DEVICE_HIGH 0x0a4
// Status Bits
#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
#define VIRTIO_CONFIG_S_DRIVER 2
#define VIRTIO_CONFIG_S_DRIVER_OK 4
#define VIRTIO_CONFIG_S_FEATURES_OK 8
// Feature Bits
#define VIRTIO_BLK_F_RO 5
#define VIRTIO_BLK_F_SCSI 7
#define VIRTIO_BLK_F_CONFIG_WCE 11
#define VIRTIO_BLK_F_MQ 12
#define VIRTIO_F_ANY_LAYOUT 27
#define VIRTIO_RING_F_INDIRECT_DESC 28
#define VIRTIO_RING_F_EVENT_IDX 29
#define VIRTIO_F_VERSION_1 32
// Descriptor Flags
#define VRING_DESC_F_NEXT 1
#define VRING_DESC_F_WRITE 2
#define NUM_DESCS 8
#define VIRTIO_BLK_T_IN 0
#define VIRTIO_BLK_T_OUT 1
// Device Configuration Layout (Offset 0x100)
#define VIRTIO_MMIO_CONFIG 0x100
namespace VirtIO
{
struct VRingDesc
{
uint64 addr;
uint32 len;
uint16 flags;
uint16 next;
};
struct VRingAvail
{
uint16 flags;
uint16 idx;
uint16 ring[NUM_DESCS];
};
struct VRingUsedElem
{
uint32 id;
uint32 len;
};
struct VRingUsed
{
uint16 flags;
uint16 idx;
struct VRingUsedElem ring[NUM_DESCS];
};
struct __attribute__((packed)) BlockRequest
{
uint32 type; // 0=Read, 1=Write
uint32 reserved;
uint64 sector;
};
void init();
void intr();
void rw(int write, uint64 blockno, char *buf);
void test_rw();
void test_bio();
}
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