97 lines
3.5 KiB
C
97 lines
3.5 KiB
C
/*
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* Copyright (c) 2019 Stefan Fritsch <sf@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _DEV_PCI_VIRTIO_PCIREG_H_
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#define _DEV_PCI_VIRTIO_PCIREG_H_
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/* Virtio 0.9 config space */
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#define VIRTIO_CONFIG_DEVICE_FEATURES 0 /* 32bit */
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#define VIRTIO_CONFIG_GUEST_FEATURES 4 /* 32bit */
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#define VIRTIO_CONFIG_QUEUE_ADDRESS 8 /* 32bit */
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#define VIRTIO_CONFIG_QUEUE_SIZE 12 /* 16bit */
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#define VIRTIO_CONFIG_QUEUE_SELECT 14 /* 16bit */
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#define VIRTIO_CONFIG_QUEUE_NOTIFY 16 /* 16bit */
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#define VIRTIO_CONFIG_DEVICE_STATUS 18 /* 8bit */
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#define VIRTIO_CONFIG_ISR_STATUS 19 /* 8bit */
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#define VIRTIO_CONFIG_ISR_CONFIG_CHANGE 2
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#define VIRTIO_CONFIG_DEVICE_CONFIG_NOMSI 20
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/* Only if MSIX is enabled: */
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#define VIRTIO_MSI_CONFIG_VECTOR 20 /* 16bit, optional */
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#define VIRTIO_MSI_QUEUE_VECTOR 22 /* 16bit, optional */
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#define VIRTIO_CONFIG_DEVICE_CONFIG_MSI 24
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#define VIRTIO_MSI_NO_VECTOR 0xffff
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/*
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* Virtio 1.0 specific
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*/
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struct virtio_pci_cap {
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uint8_t cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
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uint8_t cap_next; /* Generic PCI field: next ptr. */
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uint8_t cap_len; /* Generic PCI field: capability length */
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uint8_t cfg_type; /* Identifies the structure. */
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uint8_t bar; /* Where to find it. */
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uint8_t padding[3]; /* Pad to full dword. */
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uint32_t offset; /* Offset within bar. */
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uint32_t length; /* Length of the structure, in bytes. */
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} __packed;
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/* Common configuration */
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#define VIRTIO_PCI_CAP_COMMON_CFG 1
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/* Notifications */
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#define VIRTIO_PCI_CAP_NOTIFY_CFG 2
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/* ISR Status */
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#define VIRTIO_PCI_CAP_ISR_CFG 3
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/* Device specific configuration */
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#define VIRTIO_PCI_CAP_DEVICE_CFG 4
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/* PCI configuration access */
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#define VIRTIO_PCI_CAP_PCI_CFG 5
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struct virtio_pci_notify_cap {
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struct virtio_pci_cap cap;
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uint32_t notify_off_multiplier; /* Multiplier for queue_notify_off. */
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} __packed;
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struct virtio_pci_cfg_cap {
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struct virtio_pci_cap cap;
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uint8_t pci_cfg_data[4]; /* Data for BAR access. */
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} __packed;
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struct virtio_pci_common_cfg {
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/* About the whole device. */
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uint32_t device_feature_select; /* read-write */
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uint32_t device_feature; /* read-only for driver */
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uint32_t driver_feature_select; /* read-write */
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uint32_t driver_feature; /* read-write */
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uint16_t config_msix_vector; /* read-write */
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uint16_t num_queues; /* read-only for driver */
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uint8_t device_status; /* read-write */
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uint8_t config_generation; /* read-only for driver */
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/* About a specific virtqueue. */
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uint16_t queue_select; /* read-write */
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uint16_t queue_size; /* read-write, power of 2, or 0. */
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uint16_t queue_msix_vector; /* read-write */
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uint16_t queue_enable; /* read-write */
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uint16_t queue_notify_off; /* read-only for driver */
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uint64_t queue_desc; /* read-write */
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uint64_t queue_avail; /* read-write */
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uint64_t queue_used; /* read-write */
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} __packed;
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#endif /* _DEV_PCI_VIRTIO_PCIREG_H_ */
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