From: Lei Xia <lxia@northwestern.edu>
Date: Thu, 4 Nov 2010 14:12:28 +0000 (-0500)
Subject: add stream-serial device interface
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=eca29284d3259159428fa1302ec46212280f75c1;hp=35a7784f058e9f6948e1ec455ce2c6c3d467330b;p=palacios.git

add stream-serial device interface
---

diff --git a/palacios/src/devices/stream.c b/palacios/src/devices/stream.c
new file mode 100644
index 0000000..bfcb855
--- /dev/null
+++ b/palacios/src/devices/stream.c
@@ -0,0 +1,112 @@
+/* 
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National 
+ * Science Foundation and the Department of Energy.  
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico.  You can find out more at 
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2010, Peter Dinda <pdinda@northwestern.edu>
+ * Copyright (c) 2010, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Peter Dinda <pdinda@northwestern.edu>
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+#include <palacios/vmm.h>
+#include <palacios/vmm_stream.h>
+#include <palacios/vmm_dev_mgr.h>
+#include <palacios/vmm_sprintf.h>
+#include <palacios/vmm_host_events.h>
+#include <palacios/vmm_lock.h>
+#include <palacios/vmm_string.h>
+#include <devices/serial.h>
+
+
+struct stream_state {
+    void *stream;
+    struct vm_device *frontend_dev;
+};
+
+
+static int stream_read(char *buf, uint_t length, void *private_data) 
+{
+    struct vm_device *dev = (struct vm_device *) private_data;
+    struct stream_state *state = (struct stream_state *) dev->private_data;
+    
+    return V3_StreamRead(state->stream,buf,length);
+}
+
+static int stream_write(char *buf, uint_t length, void *private_data) 
+{
+    struct vm_device *dev = (struct vm_device *) private_data;
+    struct stream_state *state = (struct stream_state *) dev->private_data;
+    
+    return V3_StreamWrite(state->stream,buf,length);
+}
+
+
+
+static struct v3_stream_ops stream_ops = {
+    .write = stream_write,
+    .read = stream_read,
+};
+
+static struct v3_device_ops dev_ops = {
+    .free = NULL,
+    .reset = NULL,
+    .start = NULL,
+    .stop = NULL,
+};
+
+static int stream_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) 
+{
+    v3_cfg_tree_t * frontend_cfg = v3_cfg_subtree(cfg, "frontend");
+    const char * frontend_tag = v3_cfg_val(frontend_cfg, "tag");
+    struct vm_device * frontend = v3_find_dev(vm, frontend_tag);
+    char * dev_id = v3_cfg_val(cfg, "ID");
+    char * path = v3_cfg_val(cfg, "localname");
+    struct stream_state *state;
+
+    /* read configuration */
+    V3_ASSERT(frontend_cfg);
+    V3_ASSERT(frontend_tag);
+    V3_ASSERT(frontend);
+
+    
+    /* allocate state */
+    state = (struct stream_state *)V3_Malloc(sizeof(struct stream_state));
+    V3_ASSERT(state);
+    state->frontend_dev = frontend;
+    V3_ASSERT(path);
+	
+    /* The system is responsible for interpreting the localname of the stream */
+    state->stream = V3_StreamOpen(path, STREAM_OPEN_MODE_READ | STREAM_OPEN_MODE_WRITE);
+    if (!state->stream) {
+	PrintError("Could not open localname %s\n", path);
+	V3_Free(state);
+	return -1;
+    }
+
+    /* allocate device */
+    struct vm_device *dev = v3_allocate_device(dev_id, &dev_ops, state);
+    V3_ASSERT(dev);
+
+    /* attach device to virtual machine */
+    if (v3_attach_device(vm, dev) == -1) {
+	PrintError("Could not attach device %s\n", dev_id);
+	V3_Free(state);
+	return -1;
+    }
+
+    v3_stream_register_serial(frontend, &stream_ops, dev);
+
+	return 0;
+}
+
+device_register("STREAM", stream_init)
+