From: Jack Lange <jarusl@cs.northwestern.edu>
Date: Tue, 12 Jan 2010 20:39:02 +0000 (-0600)
Subject: added disk model something or other
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=commitdiff_plain;h=7021908ce7f63df7c8a9e8e007471d8df96aa1b6

added disk model something or other
---

diff --git a/palacios/src/devices/disk_model.c b/palacios/src/devices/disk_model.c
new file mode 100644
index 0000000..75f4526
--- /dev/null
+++ b/palacios/src/devices/disk_model.c
@@ -0,0 +1,131 @@
+/* 
+ * 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) 2008, Jack Lange <jarusl@cs.northwestern.edu>
+ * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Jack Lange <jarusl@cs.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_dev_mgr.h>
+#include <palacios/vmm_sym_swap.h>
+#include <palacios/vm_guest.h>
+
+
+
+void __udelay(unsigned long usecs);
+
+
+struct disk_state {
+    struct v3_dev_blk_ops * ops;
+    uint32_t seek_usecs;
+
+    void * private_data;
+};
+
+
+static int model_write(uint8_t * buf,  uint64_t lba, uint64_t num_bytes, void * private_data) {
+    struct disk_state * model = (struct disk_state *)private_data;
+    
+    __udelay(model->seek_usecs);
+
+    return model->ops->write(buf, lba, num_bytes, model->private_data);
+
+}
+
+static int model_read(uint8_t * buf,  uint64_t lba, uint64_t num_bytes, void * private_data) {
+    struct disk_state * model = (struct disk_state *)private_data;
+    
+    __udelay(model->seek_usecs);
+
+    return model->ops->read(buf, lba, num_bytes, model->private_data);
+
+}
+
+static uint64_t model_get_capacity(void * private_data) {
+    struct disk_state * model = (struct disk_state *)private_data;
+
+    return model->ops->get_capacity(model->private_data);
+}
+
+static int model_free(struct vm_device * dev) {
+    return -1;
+}
+
+
+
+static struct v3_dev_blk_ops blk_ops = {
+    .read = model_read, 
+    .write = model_write, 
+    .get_capacity = model_get_capacity,
+};
+
+
+
+static struct v3_device_ops dev_ops = {
+    .free = model_free,
+    .reset = NULL,
+    .start = NULL,
+    .stop = NULL,
+};
+
+
+static int connect_fn(struct guest_info * info, 
+		      void * frontend_data, 
+		      struct v3_dev_blk_ops * ops, 
+		      v3_cfg_tree_t * cfg, 
+		      void * private_data) {
+
+  v3_cfg_tree_t * frontend_cfg = v3_cfg_subtree(cfg, "frontend");
+  uint32_t seek_time = atoi(v3_cfg_val(cfg, "seek_us"));
+  struct disk_state * model = (struct disk_state *)V3_Malloc(sizeof(struct disk_state));
+
+
+  model->ops = ops;
+  model->seek_usecs = seek_time;
+  model->private_data = private_data;
+
+  if (v3_dev_connect_blk(info, v3_cfg_val(frontend_cfg, "tag"), 
+			 &blk_ops, frontend_cfg, model) == -1) {
+      PrintError("Could not connect  to frontend %s\n", 
+		  v3_cfg_val(frontend_cfg, "tag"));
+      return -1;
+  }
+
+  return 0;
+}
+
+static int model_init(struct guest_info * vm, v3_cfg_tree_t * cfg) {
+
+    char * name = v3_cfg_val(cfg, "name");
+
+    struct vm_device * dev = v3_allocate_device(name, &dev_ops, NULL);
+
+    if (v3_attach_device(vm, dev) == -1) {
+	PrintError("Could not attach device %s\n", name);
+	return -1;
+    }
+
+    if (v3_dev_add_blk_frontend(vm, name, connect_fn, NULL) == -1) {
+	PrintError("Could not register %s as block frontend\n", name);
+	return -1;
+    }
+
+
+    return 0;
+}
+
+
+
+device_register("DISK_MODEL", model_init)