virtio-pci: define layout for virtio 1.0

/* Vector value used to disable MSI for queue */

#define VIRTIO_MSI_NO_VECTOR            0xffff

#ifndef VIRTIO_PCI_NO_MODERN

/* IDs for different capabilities.  Must all exist. */

/* Common configuration */

#define VIRTIO_PCI_CAP_COMMON_CFG	1

/* Notifications */

#define VIRTIO_PCI_CAP_NOTIFY_CFG	2

/* ISR access */

#define VIRTIO_PCI_CAP_ISR_CFG		3

/* Device specific confiuration */

#define VIRTIO_PCI_CAP_DEVICE_CFG	4

/* This is the PCI capability header: */

struct virtio_pci_cap {

	__u8 cap_vndr;		/* Generic PCI field: PCI_CAP_ID_VNDR */

	__u8 cap_next;		/* Generic PCI field: next ptr. */

	__u8 cap_len;		/* Generic PCI field: capability length */

	__u8 type_and_bar;	/* Upper 3 bits: bar.

				 * Lower 3 is VIRTIO_PCI_CAP_*_CFG. */

	__le32 offset;		/* Offset within bar. */

	__le32 length;		/* Length. */

};

#define VIRTIO_PCI_CAP_BAR_SHIFT	5

#define VIRTIO_PCI_CAP_BAR_MASK		0x7

#define VIRTIO_PCI_CAP_TYPE_SHIFT	0

#define VIRTIO_PCI_CAP_TYPE_MASK	0x7

struct virtio_pci_notify_cap {

	struct virtio_pci_cap cap;

	__le32 notify_off_multiplier;	/* Multiplier for queue_notify_off. */

};

/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */

struct virtio_pci_common_cfg {

	/* About the whole device. */

	__le32 device_feature_select;	/* read-write */

	__le32 device_feature;		/* read-only */

	__le32 guest_feature_select;	/* read-write */

	__le32 guest_feature;		/* read-write */

	__le16 msix_config;		/* read-write */

	__le16 num_queues;		/* read-only */

	__u8 device_status;		/* read-write */

	__u8 config_generation;		/* read-only */

	/* About a specific virtqueue. */

	__le16 queue_select;		/* read-write */

	__le16 queue_size;		/* read-write, power of 2. */

	__le16 queue_msix_vector;	/* read-write */

	__le16 queue_enable;		/* read-write */

	__le16 queue_notify_off;	/* read-only */

	__le32 queue_desc_lo;		/* read-write */

	__le32 queue_desc_hi;		/* read-write */

	__le32 queue_avail_lo;		/* read-write */

	__le32 queue_avail_hi;		/* read-write */

	__le32 queue_used_lo;		/* read-write */

	__le32 queue_used_hi;		/* read-write */

};

#endif /* VIRTIO_PCI_NO_MODERN */

#endif