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/** @file
Generic type and macro definitions corresponding to the virtio-0.9.5
specification.
Copyright (C) 2012-2016, Red Hat, Inc.
Portion of Copyright (C) 2013, ARM Ltd.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _VIRTIO_0_9_5_H_
#define _VIRTIO_0_9_5_H_
#include <Base.h>
//
// VirtIo Subsystem Device IDs
//
#define VIRTIO_SUBSYSTEM_NETWORK_CARD 1
#define VIRTIO_SUBSYSTEM_BLOCK_DEVICE 2
#define VIRTIO_SUBSYSTEM_CONSOLE 3
#define VIRTIO_SUBSYSTEM_ENTROPY_SOURCE 4
#define VIRTIO_SUBSYSTEM_MEMORY_BALLOONING 5
#define VIRTIO_SUBSYSTEM_IO_MEMORY 6
#define VIRTIO_SUBSYSTEM_RPMSG 7
#define VIRTIO_SUBSYSTEM_SCSI_HOST 8
#define VIRTIO_SUBSYSTEM_9P_TRANSPORT 9
#define VIRTIO_SUBSYSTEM_MAC80211_WLAN 10
//
// Virtio IDs
//
#define VIRTIO_VENDOR_ID 0x1AF4
#define VIRTIO_MMIO_MAGIC 0x74726976 // "virt"
//
// VirtIo Device Specific Configuration Offsets
//
#define VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_PCI 20
#define VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_PCI_WITH_MSI_X 24
#define VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_MMIO 0x100
//
// PCI VirtIo Header Offsets
//
#define VIRTIO_PCI_OFFSET_DEVICE_FEATURES 0x00
#define VIRTIO_PCI_OFFSET_GUEST_FEATURES 0x04
#define VIRTIO_PCI_OFFSET_QUEUE_ADDRESS 0x08
#define VIRTIO_PCI_OFFSET_QUEUE_SIZE 0x0C
#define VIRTIO_PCI_OFFSET_QUEUE_SELECT 0x0E
#define VIRTIO_PCI_OFFSET_QUEUE_NOTIFY 0x10
#define VIRTIO_PCI_OFFSET_QUEUE_DEVICE_STATUS 0x12
#define VIRTIO_PCI_OFFSET_QUEUE_DEVICE_ISR 0x13
//
// MMIO VirtIo Header Offsets
//
#define VIRTIO_MMIO_OFFSET_MAGIC 0x00
#define VIRTIO_MMIO_OFFSET_VERSION 0x04
#define VIRTIO_MMIO_OFFSET_DEVICE_ID 0x08
#define VIRTIO_MMIO_OFFSET_VENDOR_ID 0x0C
#define VIRTIO_MMIO_OFFSET_HOST_FEATURES 0x10
#define VIRTIO_MMIO_OFFSET_HOST_FEATURES_SEL 0x14
#define VIRTIO_MMIO_OFFSET_GUEST_FEATURES 0x20
#define VIRTIO_MMIO_OFFSET_GUEST_FEATURES_SEL 0x24
#define VIRTIO_MMIO_OFFSET_GUEST_PAGE_SIZE 0x28
#define VIRTIO_MMIO_OFFSET_QUEUE_SEL 0x30
#define VIRTIO_MMIO_OFFSET_QUEUE_NUM_MAX 0x34
#define VIRTIO_MMIO_OFFSET_QUEUE_NUM 0x38
#define VIRTIO_MMIO_OFFSET_QUEUE_ALIGN 0x3C
#define VIRTIO_MMIO_OFFSET_QUEUE_PFN 0x40
#define VIRTIO_MMIO_OFFSET_QUEUE_NOTIFY 0x50
#define VIRTIO_MMIO_OFFSET_INTERRUPT_STATUS 0x60
#define VIRTIO_MMIO_OFFSET_INTERRUPT_ACK 0x64
#define VIRTIO_MMIO_OFFSET_STATUS 0x70
//
// Data in the communication area is defined as packed and accessed as
// volatile.
//
// Some structures contain arrays with dynamically determined size. In such
// cases the array and its sibling fields are replaced with pointers.
//
// All indices (variables and fields named *Idx) are free-running and wrap
// around after 0xFFFF. The queue size reported by the host is always an
// integral power of 2, not greater than 32768. Actual array indices are
// consistently calculated by taking the remainder of a given Idx object modulo
// QueueSize. Since 0x10000 is an integral multiple of the QueueSize, UINT16
// wraparound is a correct wraparound modulo QueueSize too (it doesn't offset
// the remainder class).
//
// virtio-0.9.5, 2.3.4 Available Ring
//
#define VRING_AVAIL_F_NO_INTERRUPT BIT0
typedef struct {
volatile UINT16 *Flags;
volatile UINT16 *Idx;
volatile UINT16 *Ring; // QueueSize elements
volatile UINT16 *UsedEvent; // unused as per negotiation
} VRING_AVAIL;
//
// virtio-0.9.5, 2.3.5 Used Ring
//
#define VRING_USED_F_NO_NOTIFY BIT0
#pragma pack(1)
typedef struct {
UINT32 Id;
UINT32 Len;
} VRING_USED_ELEM;
#pragma pack()
typedef struct {
volatile UINT16 *Flags;
volatile UINT16 *Idx;
volatile VRING_USED_ELEM *UsedElem; // QueueSize elements
volatile UINT16 *AvailEvent; // unused as per negotiation
} VRING_USED;
//
// virtio-0.9.5, 2.3.2 Descriptor Table
//
#define VRING_DESC_F_NEXT BIT0 // more descriptors in this request
#define VRING_DESC_F_WRITE BIT1 // buffer to be written *by the host*
#define VRING_DESC_F_INDIRECT BIT2 // unused
#pragma pack(1)
typedef struct {
UINT64 Addr;
UINT32 Len;
UINT16 Flags;
UINT16 Next;
} VRING_DESC;
#pragma pack()
typedef struct {
UINTN NumPages;
VOID *Base; // deallocate only this field
volatile VRING_DESC *Desc; // QueueSize elements
VRING_AVAIL Avail;
VRING_USED Used;
UINT16 QueueSize;
} VRING;
//
// virtio-0.9.5, 2.2.2.1 Device Status
//
#define VSTAT_ACK BIT0
#define VSTAT_DRIVER BIT1
#define VSTAT_DRIVER_OK BIT2
#define VSTAT_FAILED BIT7
//
// virtio-0.9.5, Appendix B: Reserved (Device-Independent) Feature Bits
//
#define VIRTIO_F_NOTIFY_ON_EMPTY BIT24
#define VIRTIO_F_RING_INDIRECT_DESC BIT28
#define VIRTIO_F_RING_EVENT_IDX BIT29
#endif // _VIRTIO_0_9_5_H_
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