[virtio] Add virtio 1.0 constants and data structures

Virtio 1.0 introduces new constants and data structures, common to all
devices as well as specific to virtio-net.  This commit adds a subset
of these to be able to drive the virtio-net 1.0 network device.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/include/ipxe/virtio-pci.h b/src/include/ipxe/virtio-pci.h
index a09c46316..8076f20c8 100644
--- a/src/include/ipxe/virtio-pci.h
+++ b/src/include/ipxe/virtio-pci.h
@@ -37,6 +37,66 @@
 /* Virtio ABI version, this must match exactly */
 #define VIRTIO_PCI_ABI_VERSION          0
 
+/* PCI capability types: */
+#define VIRTIO_PCI_CAP_COMMON_CFG       1  /* Common configuration */
+#define VIRTIO_PCI_CAP_NOTIFY_CFG       2  /* Notifications */
+#define VIRTIO_PCI_CAP_ISR_CFG          3  /* ISR access */
+#define VIRTIO_PCI_CAP_DEVICE_CFG       4  /* Device specific configuration */
+#define VIRTIO_PCI_CAP_PCI_CFG          5  /* PCI configuration access */
+
+#define __u8       uint8_t
+#define __le16     uint16_t
+#define __le32     uint32_t
+#define __le64     uint64_t
+
+/* 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 cfg_type;    /* Identifies the structure. */
+    __u8 bar;         /* Where to find it. */
+    __u8 padding[3];  /* Pad to full dword. */
+    __le32 offset;    /* Offset within bar. */
+    __le32 length;    /* Length of the structure, in bytes. */
+};
+
+struct virtio_pci_notify_cap {
+    struct virtio_pci_cap cap;
+    __le32 notify_off_multiplier; /* Multiplier for queue_notify_off. */
+};
+
+struct virtio_pci_cfg_cap {
+    struct virtio_pci_cap cap;
+    __u8 pci_cfg_data[4]; /* Data for BAR access. */
+};
+
+/* 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 */
+};
+
 static inline u32 vp_get_features(unsigned int ioaddr)
 {
    return inl(ioaddr + VIRTIO_PCI_HOST_FEATURES);