From: Jack Lange <jarusl@cs.northwestern.edu>
Date: Thu, 5 Aug 2010 18:40:29 +0000 (-0500)
Subject: actually add the filedisk implementation
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=05d8adefac27becd94fcf7d0406d64f516f22cdc;p=palacios.git

actually add the filedisk implementation
---

diff --git a/palacios/src/devices/filedisk.c b/palacios/src/devices/filedisk.c
new file mode 100644
index 0000000..3c6e573
--- /dev/null
+++ b/palacios/src/devices/filedisk.c
@@ -0,0 +1,133 @@
+/* 
+ * 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_file.h>
+
+#ifndef CONFIG_DEBUG_FILEDISK
+#undef PrintDebug
+#define PrintDebug(fmt, args...)
+#endif
+
+struct disk_state {
+    uint64_t capacity; // in bytes
+
+    int fd;
+};
+
+
+static int read(uint8_t * buf, uint64_t lba, uint64_t num_bytes, void * private_data) {
+    struct disk_state * disk = (struct disk_state *)private_data;
+
+    PrintDebug("Reading %d bytes from %p to %p\n", (uint32_t)num_bytes, (uint8_t *)(disk->disk_image + lba), buf);
+
+    V3_FileRead(disk->fd, lba, buf, num_bytes);
+
+    return 0;
+}
+
+
+static int write(uint8_t * buf, uint64_t lba, uint64_t num_bytes, void * private_data) {
+    struct disk_state * disk = (struct disk_state *)private_data;
+
+    PrintDebug("Writing %d bytes from %p to %p\n", (uint32_t)num_bytes,  buf, (uint8_t *)(disk->disk_image + lba));
+
+    V3_FileWrite(disk->fd, lba, buf, num_bytes);
+
+    return 0;
+}
+
+
+static uint64_t get_capacity(void * private_data) {
+    struct disk_state * disk = (struct disk_state *)private_data;
+
+    PrintDebug("Querying RAMDISK capacity %d\n", 
+	       (uint32_t)(disk->capacity));
+
+    return disk->capacity;
+}
+
+static struct v3_dev_blk_ops blk_ops = {
+    .read = read, 
+    .write = write,
+    .get_capacity = get_capacity,
+};
+
+
+
+
+static int disk_free(struct vm_device * dev) {
+    return 0;
+}
+
+static struct v3_device_ops dev_ops = {
+    .free = disk_free,
+    .reset = NULL,
+    .start = NULL,
+    .stop = NULL,
+};
+
+
+
+
+static int disk_init(struct guest_info * vm, v3_cfg_tree_t * cfg) {
+    struct disk_state * disk = NULL;
+    struct v3_cfg_file * file = NULL;
+    char * name = v3_cfg_val(cfg, "filename");
+    char * filename = v3_cfg_val(cfg, "file");
+
+    v3_cfg_tree_t * frontend_cfg = v3_cfg_subtree(cfg, "frontend");
+
+    disk = (struct disk_state *)V3_Malloc(sizeof(struct disk_state));
+    memset(disk, 0, sizeof(struct disk_state));
+
+
+    if (!filename) {
+	PrintError("Missing filename (%s) for %s\n", filename, name);
+	return -1;
+    }
+    
+    disk->fd = V3_FileOpen(filename, 0);
+    disk->capacity = V3_FileSize(disk->fd);
+
+    PrintDebug("Registering RAMDISK at %p (size=%d)\n", 
+	       (void *)file->data, (uint32_t)file->size);
+
+    struct vm_device * dev = v3_allocate_device(name, &dev_ops, disk);
+
+    if (v3_attach_device(vm, dev) == -1) {
+	PrintError("Could not attach device %s\n", name);
+	return -1;
+    }
+
+    if (v3_dev_connect_blk(vm, v3_cfg_val(frontend_cfg, "tag"), 
+			   &blk_ops, frontend_cfg, disk) == -1) {
+	PrintError("Could not connect %s to frontend %s\n", 
+		   name, v3_cfg_val(frontend_cfg, "tag"));
+	return -1;
+    }
+    
+
+    return 0;
+}
+
+
+device_register("FILEDISK", disk_init)