Module virtio_blk 

VirtIO block device driver VirtIO block device driver for boot partition access.

Minimal read-only driver for reading modules from the FAT32 boot partition. Supports VirtIO MMIO transport (common on RISC-V/ARM64 QEMU) with a working virtqueue-based block read implementation.

Uses the kernel frame allocator (available after buddy init) to allocate physically-contiguous vring and bounce-buffer memory.

Structs

BootBlockHeader 🔒

VirtIO block request header (must match device layout exactly).

BootVirtqueue 🔒

Minimal boot-time virtqueue with a static vring allocation.

VirtioBlkDevice

VirtIO block device (boot-time MMIO transport)

VringAvail 🔒

Available ring header (followed by queue_size u16 ring entries + optional used_event).

VringDesc 🔒

VRING descriptor (16 bytes).

VringUsed 🔒

Used ring header (followed by queue_size VringUsedElem entries + optional avail_event).

VringUsedElem 🔒

Used ring element (8 bytes).

Enums

BootBlockStatus 🔒

VirtIO block request status byte.

Constants

BOOT_QUEUE_SIZE 🔒

Small queue size is enough for single-block boot reads (header+data+status = 3 descs).

REG_CAPACITY 🔒

REG_DEVICE_FEATURES 🔒

REG_DRIVER_FEATURES 🔒

REG_QUEUE_ALIGN 🔒

REG_QUEUE_NOTIFY 🔒

REG_QUEUE_NUM 🔒

REG_QUEUE_NUM_MAX 🔒

REG_QUEUE_PFN 🔒

REG_QUEUE_SEL 🔒

REG_STATUS 🔒

REQ_TYPE_IN 🔒

STATUS_ACK 🔒

STATUS_DRIVER 🔒

STATUS_DRIVER_OK 🔒

STATUS_FAILED 🔒

STATUS_FEATURES_OK 🔒

VRING_DESC_F_NEXT 🔒

VRING_DESC_F_WRITE 🔒