virtio-mmio: device probing and initialization.

Add virtio_mmio_setup_one() to setup virtio mmio devices.  Add
vp_init_mmio() to initialize device struct.  Because virtio-pci and
virtio-mmio are quite simliar we reuse the infrastructure we already
have for virtio-pci and just setup struct vp_cap for virtio-mmio.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/src/hw/virtio-mmio.c b/src/hw/virtio-mmio.c
new file mode 100644
index 00000000..0d6ef6e2
--- /dev/null
+++ b/src/hw/virtio-mmio.c
@@ -0,0 +1,58 @@
+#include "config.h" // CONFIG_DEBUG_LEVEL
+#include "malloc.h" // free
+#include "output.h" // dprintf
+#include "stacks.h" // run_thread
+#include "string.h" // memset
+#include "virtio-pci.h"
+#include "virtio-ring.h"
+#include "virtio-mmio.h"
+
+void virtio_mmio_setup_one(u64 addr)
+{
+    u32 magic, version, devid;
+    void *mmio;
+
+    if (addr >= 0x100000000) {
+        dprintf(1, "virtio-mmio: %llx: above 4G\n", addr);
+        return;
+    }
+
+    mmio = (void*)(u32)(addr);
+    magic = readl(mmio);
+    if (magic != 0x74726976) {
+        dprintf(1, "virtio-mmio: %llx: magic mismatch\n", addr);
+        return;
+    }
+    version = readl(mmio+4);
+    if (version != 1 /* legacy */ &&
+        version != 2 /* 1.0 */) {
+        dprintf(1, "virtio-mmio: %llx: unknown version %d\n", addr, version);
+        return;
+    }
+    devid = readl(mmio+8);
+    dprintf(1, "virtio-mmio: %llx: device id %x%s\n",
+            addr, devid, version == 1 ? " (legacy)" : "");
+    switch (devid) {
+    case 2: /* blk */
+        /* TODO */
+        break;
+    case 8: /* scsi */
+        /* TODO */
+        break;
+    default:
+        break;
+    }
+}
+
+void vp_init_mmio(struct vp_device *vp, void *mmio)
+{
+    memset(vp, 0, sizeof(*vp));
+    vp->use_mmio = 1;
+    vp->common.mode = VP_ACCESS_MMIO;
+    vp->common.memaddr = mmio;
+    vp->device.mode = VP_ACCESS_MMIO;
+    vp->device.memaddr = mmio + 0x100;
+    vp_reset(vp);
+    vp_set_status(vp, VIRTIO_CONFIG_S_ACKNOWLEDGE |
+                  VIRTIO_CONFIG_S_DRIVER);
+}