Changeset c1ba24a in mainline for uspace/lib/virtio/virtio.c

Timestamp:

2018-05-23T20:38:54Z (7 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

5dddac1

Parents:

9364ced

Message:

Allow descriptors to be set and made available

File:

• uspace/lib/virtio/virtio.c (modified) (1 diff)

uspace/lib/virtio/virtio.c

@@ -37 +37 @@
 
 #include <ddf/log.h>
+#include <libarch/barrier.h>
+
+void virtio_virtq_set_desc(virtio_dev_t *vdev, uint16_t num, uint16_t descno,
+    uint64_t addr, uint32_t len, uint16_t flags, uint16_t next)
+{
+        virtq_desc_t *d = &vdev->queues[num].desc[descno];
+        pio_write_64(&d->addr, addr);
+        pio_write_32(&d->len, len);
+        pio_write_16(&d->flags, flags);
+        pio_write_16(&d->next, next);
+}
+
+void virtio_virtq_produce_available(virtio_dev_t *vdev, uint16_t num,
+    uint16_t descno)
+{
+        virtq_t *q = &vdev->queues[num];
+
+        uint16_t idx = pio_read_16(&q->avail->idx);
+        pio_write_16(&q->avail->ring[idx], descno);
+        write_barrier();
+        pio_write_16(&q->avail->idx, (idx + 1) % q->queue_size);
+        write_barrier();
+        pio_write_16(&q->notify, num);
+}
 
 errno_t virtio_virtq_setup(virtio_dev_t *vdev, uint16_t num, uint16_t size)