virtio.h

Go to the documentation of this file.

#ifndef __HAL__VIRTIO__VIRTIO_H__
#define __HAL__VIRTIO__VIRTIO_H__
 
#include <type.h>
 
#define VIRTIO_PCI_CAP 0x09
 
#define VIRTIO_PCI_CAP_COMMON_CFG 1
#define VIRTIO_PCI_CAP_NOTIFY_CFG 2
#define VIRTIO_PCI_CAP_ISR_CFG 3
#define VIRTIO_PCI_CAP_DEVICE_CFG 4
#define VIRTIO_PCI_CAP_PCI_CFG 5
 
// VirtIO Device Status bits
#define VIRTIO_STATUS_ACKNOWLEDGE (1 << 0)
#define VIRTIO_STATUS_DRIVER (1 << 1)
#define VIRTIO_STATUS_DRIVER_OK (1 << 2)
#define VIRTIO_STATUS_FEATURES_OK (1 << 3)
#define VIRTIO_STATUS_DEVICE_NEEDS_RESET (1 << 6)
#define VIRTIO_STATUS_FAILED (1 << 7)
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct {
    uint32_t device_feature_select;
    uint32_t device_feature;
    uint32_t driver_feature_select;
    uint32_t driver_feature;
    uint16_t msix_config;
    uint16_t num_queues;
    uint8_t device_status;
    uint8_t config_generation;
 
    uint16_t queue_select;
    uint16_t queue_size;
    uint16_t queue_msix_vector;
    uint16_t queue_enable;
    uint16_t queue_notify_off;
    uint64_t queue_desc;
    uint64_t queue_avail;
    uint64_t queue_used;
} __attribute__((packed)) virtio_pci_common_cfg_t;
 
typedef struct {
    struct virtq_desc* desc;
    struct virtq_avail* avail;
    struct virtq_used* used;
    uint16_t queue_size;
    uint16_t free_head;
    uint16_t num_free;
    uint16_t last_used_idx;
    uintptr_t phys_addr;
} virtio_queue_t;
 
typedef struct {
    virtio_pci_common_cfg_t* common_cfg;
    volatile uint32_t* notify_base;
    volatile uint8_t* isr;
    uintptr_t notify_offset;
    uintptr_t notify_multiplier;
    virtio_queue_t controlq;
    uint32_t features;
    bool initialized;
} virtio_device_t;
 
struct virtio_pci_cap {
    uint8_t cap_vndr;
    uint8_t cap_next;
    uint8_t cap_len;
    uint8_t cfg_type;
    uint8_t bar;
    uint8_t padding[3];
    uint32_t offset;
    uint32_t length;
} __attribute__((packed));
 
struct ioforge_virtio_device*
find_virtio_device_by_id(uint16_t vendor_id, uint16_t device_id);
 
#ifdef __cplusplus
}
#endif
 
#endif // __HAL__VIRTIO__VIRTIO_H__