68 lines
3.5 KiB
C
68 lines
3.5 KiB
C
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-9-16 GuEe-GUI the first version
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* 2021-11-11 GuEe-GUI modify to virtio common interface
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*/
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#ifndef __VIRTIO_MMIO_H__
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#define __VIRTIO_MMIO_H__
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#include <rtdef.h>
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struct virtio_mmio_config
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{
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rt_uint32_t magic; /* [0x00]<RO> Magic value */
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rt_uint32_t version; /* [0x04]<RO> Device version number */
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rt_uint32_t device_id; /* [0x08]<RO> Virtio Subsystem Device ID */
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rt_uint32_t vendor_id; /* [0x0c]<RO> Virtio Subsystem Vendor ID */
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rt_uint32_t device_features; /* [0x10]<RO> Flags representing features the device supports */
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rt_uint32_t device_features_sel; /* [0x14]<WO> Device (host) features word selection. */
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rt_uint32_t res0[2]; /* [0x18] */
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rt_uint32_t driver_features; /* [0x20]<WO> Device features understood and activated by the driver */
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rt_uint32_t driver_features_sel; /* [0x24]<WO> Activated (guest) features word selection */
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rt_uint32_t guest_page_size; /* [0x28]<WO> Guest page size, this value should be a power of 2 */
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rt_uint32_t res1[1]; /* [0x2c] */
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rt_uint32_t queue_sel; /* [0x30]<WO> Virtual queue index */
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rt_uint32_t queue_num_max; /* [0x34]<RO> Maximum virtual queue size */
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rt_uint32_t queue_num; /* [0x38]<WO> Virtual queue size */
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rt_uint32_t queue_align; /* [0x3c]<WO> Used Ring alignment in the virtual queue */
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rt_uint32_t queue_pfn; /* [0x40]<RW> Guest physical page number of the virtual queue */
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rt_uint32_t queue_ready; /* [0x44]<RW> Virtual queue ready bit */
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rt_uint32_t res2[2]; /* [0x48] */
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rt_uint32_t queue_notify; /* [0x50]<WO> Queue notifier */
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rt_uint32_t res3[3]; /* [0x54] */
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rt_uint32_t interrupt_status; /* [0x60]<RO> Interrupt status */
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rt_uint32_t interrupt_ack; /* [0x64]<WO> Interrupt acknowledge */
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rt_uint32_t res4[2]; /* [0x68] */
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rt_uint32_t status; /* [0x70]<RW> Device status */
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rt_uint32_t res5[3]; /* [0x74] */
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rt_uint32_t queue_desc_low; /* [0x80]<WO> Virtual queue’s Descriptor Area 64 bit long physical address */
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rt_uint32_t queue_desc_high; /* [0x84]<WO> */
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rt_uint32_t res6[2]; /* [0x88] */
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rt_uint32_t queue_driver_low; /* [0x90]<WO> Virtual queue’s Driver Area 64 bit long physical address */
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rt_uint32_t queue_driver_high; /* [0x94]<WO> */
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rt_uint32_t res7[2]; /* [0x98] */
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rt_uint32_t queue_device_low; /* [0xa0]<WO> Virtual queue’s Device Area 64 bit long physical address */
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rt_uint32_t queue_device_high; /* [0xa4]<WO> */
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rt_uint32_t res8[21]; /* [0xa8] */
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rt_uint32_t config_generation; /* [0xfc]<RO> Configuration atomicity value */
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rt_uint32_t config[]; /* [0x100+]<RO> Configuration space */
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/*
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* According to the compiler's optimization ways, we should force compiler not
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* to optimization here, but it will cause some compilers generate memory access
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* instructions fail. So we allow user to choose a toggle of optimize here.
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*/
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#ifdef RT_USING_VIRTIO_MMIO_ALIGN
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} __attribute__((packed));
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#else
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};
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#endif
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#endif /* __VIRTIO_MMIO_H__ */
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