From 5dd51079768140bcc9545fe64e75b760eb681ea8 Mon Sep 17 00:00:00 2001
From: Laurent Vivier
Date: Wed, 19 Nov 2008 17:28:25 +0100
Subject: [virtio] Move virtio-pci.h and virtio-ring.h to include/gpxe

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
---
 src/include/gpxe/virtio-pci.h  | 94 ++++++++++++++++++++++++++++++++++++++++++
 src/include/gpxe/virtio-ring.h | 93 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 187 insertions(+)
 create mode 100644 src/include/gpxe/virtio-pci.h
 create mode 100644 src/include/gpxe/virtio-ring.h

(limited to 'src/include')

diff --git a/src/include/gpxe/virtio-pci.h b/src/include/gpxe/virtio-pci.h
new file mode 100644
index 000000000..ba0604d52
--- /dev/null
+++ b/src/include/gpxe/virtio-pci.h
@@ -0,0 +1,94 @@
+#ifndef _VIRTIO_PCI_H_
+# define _VIRTIO_PCI_H_
+
+/* A 32-bit r/o bitmask of the features supported by the host */
+#define VIRTIO_PCI_HOST_FEATURES        0
+
+/* A 32-bit r/w bitmask of features activated by the guest */
+#define VIRTIO_PCI_GUEST_FEATURES       4
+
+/* A 32-bit r/w PFN for the currently selected queue */
+#define VIRTIO_PCI_QUEUE_PFN            8
+
+/* A 16-bit r/o queue size for the currently selected queue */
+#define VIRTIO_PCI_QUEUE_NUM            12
+
+/* A 16-bit r/w queue selector */
+#define VIRTIO_PCI_QUEUE_SEL            14
+
+/* A 16-bit r/w queue notifier */
+#define VIRTIO_PCI_QUEUE_NOTIFY         16
+
+/* An 8-bit device status register.  */
+#define VIRTIO_PCI_STATUS               18
+
+/* An 8-bit r/o interrupt status register.  Reading the value will return the
+ * current contents of the ISR and will also clear it.  This is effectively
+ * a read-and-acknowledge. */
+#define VIRTIO_PCI_ISR                  19
+
+/* The bit of the ISR which indicates a device configuration change. */
+#define VIRTIO_PCI_ISR_CONFIG           0x2
+
+/* The remaining space is defined by each driver as the per-driver
+ * configuration space */
+#define VIRTIO_PCI_CONFIG               20
+
+/* Virtio ABI version, this must match exactly */
+#define VIRTIO_PCI_ABI_VERSION          0
+
+static inline u32 vp_get_features(struct nic *nic)
+{
+   return inl(nic->ioaddr + VIRTIO_PCI_HOST_FEATURES);
+}
+
+static inline void vp_set_features(struct nic *nic, u32 features)
+{
+        outl(features, nic->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
+}
+
+static inline void vp_get(struct nic *nic, unsigned offset,
+                     void *buf, unsigned len)
+{
+   u8 *ptr = buf;
+   unsigned i;
+
+   for (i = 0; i < len; i++)
+           ptr[i] = inb(nic->ioaddr + VIRTIO_PCI_CONFIG + offset + i);
+}
+
+static inline u8 vp_get_status(struct nic *nic)
+{
+   return inb(nic->ioaddr + VIRTIO_PCI_STATUS);
+}
+
+static inline void vp_set_status(struct nic *nic, u8 status)
+{
+   if (status == 0)        /* reset */
+           return;
+        outb(status, nic->ioaddr + VIRTIO_PCI_STATUS);
+}
+
+
+static inline void vp_reset(struct nic *nic)
+{
+   outb(0, nic->ioaddr + VIRTIO_PCI_STATUS);
+   (void)inb(nic->ioaddr + VIRTIO_PCI_ISR);
+}
+
+static inline void vp_notify(struct nic *nic, int queue_index)
+{
+   outw(queue_index, nic->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
+}
+
+static inline void vp_del_vq(struct nic *nic, int queue_index)
+{
+   /* select the queue */
+
+   outw(queue_index, nic->ioaddr + VIRTIO_PCI_QUEUE_SEL);
+
+   /* deactivate the queue */
+
+   outl(0, nic->ioaddr + VIRTIO_PCI_QUEUE_PFN);
+}
+#endif /* _VIRTIO_PCI_H_ */
diff --git a/src/include/gpxe/virtio-ring.h b/src/include/gpxe/virtio-ring.h
new file mode 100644
index 000000000..33060b112
--- /dev/null
+++ b/src/include/gpxe/virtio-ring.h
@@ -0,0 +1,93 @@
+#ifndef _VIRTIO_RING_H_
+# define _VIRTIO_RING_H_
+#define PAGE_SHIFT (12)
+#define PAGE_SIZE  (1<<PAGE_SHIFT)
+#define PAGE_MASK  (PAGE_SIZE-1)
+
+/* Status byte for guest to report progress, and synchronize features. */
+/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
+#define VIRTIO_CONFIG_S_ACKNOWLEDGE     1
+/* We have found a driver for the device. */
+#define VIRTIO_CONFIG_S_DRIVER          2
+/* Driver has used its parts of the config, and is happy */
+#define VIRTIO_CONFIG_S_DRIVER_OK       4
+/* We've given up on this device. */
+#define VIRTIO_CONFIG_S_FAILED          0x80
+
+#define MAX_QUEUE_NUM      (512)
+
+#define VRING_DESC_F_NEXT  1
+#define VRING_DESC_F_WRITE 2
+
+#define VRING_AVAIL_F_NO_INTERRUPT 1
+
+#define VRING_USED_F_NO_NOTIFY     1
+
+struct vring_desc
+{
+   u64 addr;
+   u32 len;
+   u16 flags;
+   u16 next;
+};
+
+struct vring_avail
+{
+   u16 flags;
+   u16 idx;
+   u16 ring[0];
+};
+
+struct vring_used_elem
+{
+   u32 id;
+   u32 len;
+};
+
+struct vring_used
+{
+   u16 flags;
+   u16 idx;
+   struct vring_used_elem ring[];
+};
+
+struct vring {
+   unsigned int num;
+   struct vring_desc *desc;
+   struct vring_avail *avail;
+   struct vring_used *used;
+};
+
+static inline void vring_init(struct vring *vr,
+                         unsigned int num, unsigned char *queue)
+{
+   unsigned int i;
+   unsigned long pa;
+
+        vr->num = num;
+
+   /* physical address of desc must be page aligned */
+
+   pa = virt_to_phys(queue);
+   pa = (pa + PAGE_MASK) & ~PAGE_MASK;
+   vr->desc = phys_to_virt(pa);
+
+        vr->avail = (struct vring_avail *)&vr->desc[num];
+
+   /* physical address of used must be page aligned */
+
+   pa = virt_to_phys(&vr->avail->ring[num]);
+   pa = (pa + PAGE_MASK) & ~PAGE_MASK;
+        vr->used = phys_to_virt(pa);
+
+   for (i = 0; i < num - 1; i++)
+           vr->desc[i].next = i + 1;
+   vr->desc[i].next = 0;
+}
+
+#define vring_size(num) \
+   (((((sizeof(struct vring_desc) * num) + \
+      (sizeof(struct vring_avail) + sizeof(u16) * num)) \
+         + PAGE_MASK) & ~PAGE_MASK) + \
+         (sizeof(struct vring_used) + sizeof(struct vring_used_elem) * num))
+#endif /* _VIRTIO_RING_H_ */
-- 
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