virtioblk.cpp File Reference

#include <aurora.h>
#include <aucon.h>
#include "virtioblk.h"
#include <audrv.h>
#include <pcie.h>
#include <Drivers/virtio.h>
#include <Mm/vmmngr.h>
#include <Hal/AA64/aa64lowlevel.h>
#include <Drivers/uart.h>
#include <Hal/AA64/gic.h>
#include <Mm/pmmngr.h>
#include <Mm/dma.h>
#include <Fs/vdisk.h>
#include <string.h>
#include <stdio.h>

Include dependency graph for virtioblk.cpp:

Classes
struct	VirtioBLKBuffer
struct	VirtioBLKAvail
struct	VirtioBLKRing
struct	VirtioBLKUsed
struct	VirtioBLKQueue

Macros
#define	VIRTIO_PCI_CAP_ID   0x09
#define	VIRTIO_PCI_CAP_COMMON_CFG   1
#define	VIRTIO_PCI_CAP_DEVICE_CFG   4
#define	VIRTIO_STATUS_ACKNOWLEDGE   1
#define	VIRTIO_STATUS_DRIVER   2
#define	VIRTIO_STATUS_DRIVER_OK   4
#define	VIRTIO_STATUS_FEATURES_OK   8
#define	VIRTIO_F_VERSION_1   (1ull << 32)
#define	VIRTQ_DESC_F_NEXT   1
#define	VIRTQ_DESC_F_WRITE   2
#define	VIRTIO_STATUS_ACK   0x01
#define	VIRTIO_STATUS_DRIVER   0x02
#define	VIRTIO_STATUS_DRIVER_OK   0x04
#define	VIRTIO_STATUS_FEATURES_OK   0x08
#define	VIRTIO_STATUS_DEVICE_NEEDS_RESET   0x40
#define	VIRTIO_STATUS_FAILED   0x80
#define	VIRTIO_DEFAULT_SECT_COUNT   1

Functions
void	virtioblk_reset (VirtioCommonCfg *cfg)
	virtioblk_reset – reset the device
void	virtioblk_feature_negotiate (VirtioCommonCfg *cfg)
	virtioblk_feature_negotiate – check available features of host device and enable only those supported by the driver
void	virtioblk_notify_queu (VirtioCommonCfg *cfg, uint16_t queueIdx)
	virtioblk_notify_queue – notify host that new command is present
void	virtioblk_interrupt_handler (int spiID)
void	virtioblk_alloc_requestQ (VirtioCommonCfg *cfg)
	virtioblk_alloc_requestQ – allocate requestQ of virtio
bool	virtioblk_read (VirtioCommonCfg *cfg, size_t lba, uint64_t buffer, size_t numSector)
	virtioblk_read – read data from disc
bool	virtioblk_write (VirtioCommonCfg *cfg, size_t lba, uint64_t buffer, size_t numSector)
	virtioblk_write – write data to disc
int	virtblk_read_vdisk (AuVDisk *disk, uint64_t lba, uint32_t count, uint64_t *buffer)
int	virtblk_write_vdisk (AuVDisk *disk, uint64_t lba, uint32_t count, uint64_t *buffer)
AU_EXTERN AU_EXPORT int	AuDriverUnload ()
AU_EXTERN AU_EXPORT int	AuDriverMain (AuDriver *drv)

Detailed Description

BSD 2-Clause License

Copyright (c) 2022-2026, Manas Kamal Choudhury All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Macro Definition Documentation

VIRTIO_DEFAULT_SECT_COUNT

#define VIRTIO_DEFAULT_SECT_COUNT   1

VIRTIO_F_VERSION_1

#define VIRTIO_F_VERSION_1   (1ull << 32)

VIRTIO_PCI_CAP_COMMON_CFG

#define VIRTIO_PCI_CAP_COMMON_CFG   1

VIRTIO_PCI_CAP_DEVICE_CFG

#define VIRTIO_PCI_CAP_DEVICE_CFG   4

VIRTIO_PCI_CAP_ID

#define VIRTIO_PCI_CAP_ID   0x09

VIRTIO_STATUS_ACK

#define VIRTIO_STATUS_ACK   0x01

VIRTIO_STATUS_ACKNOWLEDGE

#define VIRTIO_STATUS_ACKNOWLEDGE   1

VIRTIO_STATUS_DEVICE_NEEDS_RESET

#define VIRTIO_STATUS_DEVICE_NEEDS_RESET   0x40

VIRTIO_STATUS_DRIVER [1/2]

#define VIRTIO_STATUS_DRIVER   2

VIRTIO_STATUS_DRIVER [2/2]

#define VIRTIO_STATUS_DRIVER   0x02

VIRTIO_STATUS_DRIVER_OK [1/2]

#define VIRTIO_STATUS_DRIVER_OK   4

VIRTIO_STATUS_DRIVER_OK [2/2]

#define VIRTIO_STATUS_DRIVER_OK   0x04

VIRTIO_STATUS_FAILED

#define VIRTIO_STATUS_FAILED   0x80

VIRTIO_STATUS_FEATURES_OK [1/2]

#define VIRTIO_STATUS_FEATURES_OK   8

VIRTIO_STATUS_FEATURES_OK [2/2]

#define VIRTIO_STATUS_FEATURES_OK   0x08

VIRTQ_DESC_F_NEXT

#define VIRTQ_DESC_F_NEXT   1

VIRTQ_DESC_F_WRITE

#define VIRTQ_DESC_F_WRITE   2

Function Documentation

AuDriverMain()

AU_EXTERN AU_EXPORT int AuDriverMain

(

AuDriver *

drv

)

reset the virtio block device

whenever new storage device detected, three kernel objects are needed to create : (1) — VDisk info for read write access (2) — Device file at /dev for ioctl and raw read write without partition overhead, write it to anywhere (3) — File System node after registering partitions

AuDriverUnload()

AU_EXTERN AU_EXPORT int AuDriverUnload

(

)

virtblk_read_vdisk()

int virtblk_read_vdisk	(	AuVDisk *	disk,
		uint64_t	lba,
		uint32_t	count,
		uint64_t *	buffer
	)

virtblk_write_vdisk()

int virtblk_write_vdisk	(	AuVDisk *	disk,
		uint64_t	lba,
		uint32_t	count,
		uint64_t *	buffer
	)

virtioblk_alloc_requestQ()

void virtioblk_alloc_requestQ

(

VirtioCommonCfg *

cfg

)

virtioblk_alloc_requestQ – allocate requestQ of virtio

virtioblk_feature_negotiate()

void virtioblk_feature_negotiate

(

VirtioCommonCfg *

cfg

)

virtioblk_feature_negotiate – check available features of host device and enable only those supported by the driver

Parameters

cfg	– pointer to virtio common config

virtioblk_interrupt_handler()

void virtioblk_interrupt_handler

(

int

spiID

)

virtioblk_notify_queu()

void virtioblk_notify_queu	(	VirtioCommonCfg *	cfg,
		uint16_t	queueIdx
	)

virtioblk_notify_queue – notify host that new command is present

Parameters

queueIdx

– queue number, zero for controlq and one for cursorq

virtioblk_read()

bool virtioblk_read	(	VirtioCommonCfg *	cfg,
		size_t	lba,
		uint64_t	buffer,
		size_t	numSector
	)

virtioblk_read – read data from disc

virtioblk_reset()

void virtioblk_reset

(

VirtioCommonCfg *

cfg

)

virtioblk_reset – reset the device

Parameters

cfg	– pointer to virtio common config

virtioblk_write()

bool virtioblk_write	(	VirtioCommonCfg *	cfg,
		size_t	lba,
		uint64_t	buffer,
		size_t	numSector
	)

virtioblk_write – write data to disc