--- /dev/null
+/*
+ * 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 <devices/ram_hd.h>
+#include <devices/ide.h>
+
+
+
+#ifndef DEBUG_IDE
+#undef PrintDebug
+#define PrintDebug(fmt, args...)
+#endif
+
+struct hd_state {
+ addr_t disk_image;
+ uint32_t capacity; // in bytes
+
+ struct vm_device * ide;
+
+ uint_t bus;
+ uint_t drive;
+};
+
+
+// HDs always read 512 byte blocks... ?
+static int hd_read(uint8_t * buf, int sector_count, uint64_t lba, void * private_data) {
+ struct vm_device * hd_dev = (struct vm_device *)private_data;
+ struct hd_state * hd = (struct hd_state *)(hd_dev->private_data);
+ int offset = lba * IDE_SECTOR_SIZE;
+ int length = sector_count * IDE_SECTOR_SIZE;
+
+ // PrintDebug("Reading RAM HD at (LBA=%d) offset %d (length=%d)\n", (uint32_t)lba, offset, length);
+
+ memcpy(buf, (uint8_t *)(hd->disk_image + offset), length);
+
+ return 0;
+}
+
+
+static int hd_write(uint8_t * buf, int sector_count, uint64_t lba, void * private_data) {
+ struct vm_device * hd_dev = (struct vm_device *)private_data;
+ struct hd_state * hd = (struct hd_state *)(hd_dev->private_data);
+ int offset = lba * IDE_SECTOR_SIZE;
+ int length = sector_count * IDE_SECTOR_SIZE;
+
+ memcpy((uint8_t *)(hd->disk_image + offset), buf, length);
+
+ return 0;
+}
+
+
+static uint64_t hd_get_capacity(void * private_data) {
+ struct vm_device * hd_dev = (struct vm_device *)private_data;
+ struct hd_state * hd = (struct hd_state *)(hd_dev->private_data);
+ PrintDebug("Querying RAM HD capacity (bytes=%d) (ret = %d)\n",
+ hd->capacity, hd->capacity / IDE_SECTOR_SIZE);
+ return hd->capacity / IDE_SECTOR_SIZE;
+}
+
+static struct v3_ide_hd_ops hd_ops = {
+ .read = hd_read,
+ .write = hd_write,
+ .get_capacity = hd_get_capacity,
+};
+
+
+static int hd_init(struct vm_device * dev) {
+ struct hd_state * hd = (struct hd_state *)(dev->private_data);
+
+ if (v3_ide_register_harddisk(hd->ide, hd->bus, hd->drive, "V3-RAM-HD", &hd_ops, dev) == -1) {
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int hd_deinit(struct vm_device * dev) {
+ return 0;
+}
+
+static struct vm_device_ops dev_ops = {
+ .init = hd_init,
+ .deinit = hd_deinit,
+ .reset = NULL,
+ .start = NULL,
+ .stop = NULL,
+};
+
+struct vm_device * v3_create_ram_hd(struct vm_device * ide,
+ uint_t bus, uint_t drive,
+ addr_t ramdisk, uint32_t size) {
+ struct hd_state * hd = NULL;
+
+ if (size % IDE_SECTOR_SIZE) {
+ PrintError("HD image must be an integral of sector size (IDE_SECTOR_SIZE=%d)\n", IDE_SECTOR_SIZE);
+ return NULL;
+ }
+
+ hd = (struct hd_state *)V3_Malloc(sizeof(struct hd_state));
+
+ PrintDebug("Registering Ram HDD at %p (size=%d)\n", (void *)ramdisk, size);
+
+ hd->disk_image = ramdisk;
+ hd->capacity = size;
+
+ hd->ide = ide;
+ hd->bus = bus;
+ hd->drive = drive;
+
+ struct vm_device * hd_dev = v3_create_device("RAM-HD", &dev_ops, hd);
+
+ return hd_dev;
+}
