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https://github.com/Mathewnd/Astral.git
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Matheus
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
#ifndef _VIRTIO_H
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#define _VIRTIO_H
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#include <stddef.h>
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#include <stdint.h>
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#include <kernel/pci.h>
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#include <kernel/alloc.h>
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typedef struct {
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uint32_t devicefeatureselect;
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uint32_t devicefeature;
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uint32_t driverfeatureselect;
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uint32_t driverfeature;
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uint16_t msixvector;
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uint16_t queuecount;
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uint8_t status;
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uint8_t gen;
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uint16_t queueselect;
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uint16_t queuesize;
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uint16_t queuemsixvector;
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uint16_t queueenable;
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uint16_t queuenotifyoffset;
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uint64_t queuedesc;
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uint64_t queuedriver;
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uint64_t queuedevice;
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uint16_t queuenotifydata;
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uint16_t queuereset;
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} __attribute__((packed)) viocommonconfig_t;
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typedef struct {
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pcienum_t *e;
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volatile viocommonconfig_t *config;
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volatile void *devconfig;
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volatile uint16_t *notify;
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size_t notifymultiplier;
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} viodevice_t;
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typedef struct {
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void *address;
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size_t size;
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uint16_t *notify;
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uint16_t lastusedindex;
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} vioqueue_t;
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void virtio_init();
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size_t virtio_queuesize(viodevice_t *viodevice, int queue);
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void virtio_enablequeue(viodevice_t *viodevice, int queue);
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uint64_t virtio_negotiatefeatures(viodevice_t *viodevice, uint64_t features);
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void *virtio_createqueue(viodevice_t *viodevice, vioqueue_t *vioqueue, int queue, size_t size, int msix);
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void virtio_enabledevice(viodevice_t *viodevice);
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#define VIO_FEATURE_VERSION_1 (1l << 32)
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#define VIO_CONFIG_STATUS_SET(x, v) (x)->config->status |= v
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#define VIO_CONFIG_STATUS_ACK 1
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#define VIO_CONFIG_STATUS_DRIVER 2
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#define VIO_CONFIG_STATUS_DRIVEROK 4
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#define VIO_CONFIG_STATUS_FEATURESOK 8
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#define VIO_CONFIG_STATUS_NEEDSRESET 64
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#define VIO_CONFIG_STATUS_FAILED 128
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#define VIO_QUEUE_BUFFER_NEXT 1
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#define VIO_QUEUE_BUFFER_DEVICE 2
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typedef struct {
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uint64_t address;
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uint32_t length;
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uint16_t flags;
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uint16_t next;
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} __attribute__((packed)) viobuffer_t;
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typedef struct {
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uint32_t index;
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uint32_t length;
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} __attribute__((packed)) viousedentry_t;
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/*
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struct {
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// 16 byte alignment
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struct {
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uint64_t address;
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uint32_t length;
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uint16_t flags;
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uint16_t next;
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} __attribute__((packed)) buffer[size];
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// 2 byte alignment
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struct {
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uint16_t flags;
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uint16_t index;
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uint16_t ring[size];
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uint16_t evidx;
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} __attribute__((packed)) driver;
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uint16_t padding[(size % 2) + 1];
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// 4 byte alignment
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struct {
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uint16_t flags;
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uint16_t index;
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struct {
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uint32_t index;
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uint32_t length;
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} __attribute__((packed)) usedring[size];
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uint16_t avail;
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} __attribute__((packed)) device;
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} __attribute__((packed))
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*/
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#define VIO_QUEUE_BYTESIZE(s) (sizeof(viobuffer_t) * (s) + sizeof(uint16_t) * ((s) + 6) + sizeof(viousedentry_t) * (s))
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#define VIO_QUEUE_BUFFERS(q) ((volatile viobuffer_t *)(q)->address)
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#define VIO_QUEUE_DRV(q) ((volatile uint16_t *)((uintptr_t)(q)->address + (q)->size * sizeof(viobuffer_t)))
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#define VIO_QUEUE_DRV_IDX(q) ((volatile uint16_t *)((uintptr_t)(q)->address + (q)->size * sizeof(viobuffer_t)))[1]
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#define VIO_QUEUE_DRV_RING(q) ((volatile uint16_t *)((uintptr_t)(q)->address + (q)->size * sizeof(viobuffer_t) + 2 * sizeof(uint16_t)))
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#define VIO_QUEUE_DEV(q) ((volatile uint16_t *)((uintptr_t)(q)->address + (q)->size * sizeof(viobuffer_t) + sizeof(uint16_t) * ((q)->size + 3 + (1 - ((q)->size % 2)))))
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#define VIO_QUEUE_DEV_IDX(q) ((volatile uint16_t *)((uintptr_t)(q)->address + (q)->size * sizeof(viobuffer_t) + sizeof(uint16_t) * ((q)->size + 3 + (1 - ((q)->size % 2)))))[1]
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#define VIO_QUEUE_DEV_RING(q) ((volatile viousedentry_t *)((uintptr_t)(q)->address + (q)->size * sizeof(viobuffer_t) + sizeof(uint16_t) * ((q)->size + 5 + (1 - ((q)->size % 2)))))
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#endif
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