imported SEABIOS source tree

[palacios.git] / bios / seabios / src / virtio-pci.c

diff --git a/bios/seabios/src/virtio-pci.c b/bios/seabios/src/virtio-pci.c
new file mode 100644 (file)
index 0000000..db19e97
--- /dev/null
+++ b/bios/seabios/src/virtio-pci.c
@@ -0,0 +1,69 @@
+/* virtio-pci.c - pci interface for virtio interface
+ *
+ * (c) Copyright 2008 Bull S.A.S.
+ *
+ *  Author: Laurent Vivier <Laurent.Vivier@bull.net>
+ *
+ * some parts from Linux Virtio PCI driver
+ *
+ *  Copyright IBM Corp. 2007
+ *  Authors: Anthony Liguori  <aliguori@us.ibm.com>
+ *
+ *  Adopted for Seabios: Gleb Natapov <gleb@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPLv3
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "virtio-ring.h"
+#include "virtio-pci.h"
+#include "config.h" // CONFIG_DEBUG_LEVEL
+#include "util.h" // dprintf
+
+int vp_find_vq(unsigned int ioaddr, int queue_index,
+               struct vring_virtqueue *vq)
+{
+   struct vring * vr = &vq->vring;
+   u16 num;
+
+   ASSERT32FLAT();
+   /* select the queue */
+
+   outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL);
+
+   /* check if the queue is available */
+
+   num = inw(ioaddr + VIRTIO_PCI_QUEUE_NUM);
+   if (!num) {
+       dprintf(1, "ERROR: queue size is 0\n");
+       return -1;
+   }
+
+   if (num > MAX_QUEUE_NUM) {
+       dprintf(1, "ERROR: queue size %d > %d\n", num, MAX_QUEUE_NUM);
+       return -1;
+   }
+
+   /* check if the queue is already active */
+
+   if (inl(ioaddr + VIRTIO_PCI_QUEUE_PFN)) {
+       dprintf(1, "ERROR: queue already active\n");
+       return -1;
+   }
+
+   vq->queue_index = queue_index;
+
+   /* initialize the queue */
+
+   vring_init(vr, num, (unsigned char*)&vq->queue);
+
+   /* activate the queue
+    *
+    * NOTE: vr->desc is initialized by vring_init()
+    */
+
+   outl((unsigned long)virt_to_phys(vr->desc) >> PAGE_SHIFT,
+        ioaddr + VIRTIO_PCI_QUEUE_PFN);
+
+   return num;
+}