2 * This file is part of the Palacios Virtual Machine Monitor developed
3 * by the V3VEE Project with funding from the United States National
4 * Science Foundation and the Department of Energy.
6 * The V3VEE Project is a joint project between Northwestern University
7 * and the University of New Mexico. You can find out more at
10 * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
11 * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
12 * All rights reserved.
14 * Author: Jack Lange <jarusl@cs.northwestern.edu>
16 * This is free software. You are permitted to use,
17 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
20 #include <palacios/vmm.h>
21 #include <palacios/vmm_dev_mgr.h>
22 #include <devices/lnx_virtio_blk.h>
24 #define SWAP_CAPACITY (150 * 1024 * 1024)
28 struct vm_device * blk_dev;
32 addr_t swap_base_addr;
38 static uint64_t swap_get_capacity(void * private_data) {
39 struct vm_device * dev = (struct vm_device *)private_data;
40 struct swap_state * swap = (struct swap_state *)(dev->private_data);
42 PrintDebug("SymSwap: Getting Capacity %d\n", (uint32_t)(swap->capacity));
44 return swap->capacity / HD_SECTOR_SIZE;
47 static int swap_read(uint8_t * buf, int sector_count, uint64_t lba, void * private_data) {
48 struct vm_device * dev = (struct vm_device *)private_data;
49 struct swap_state * swap = (struct swap_state *)(dev->private_data);
50 int offset = lba * HD_SECTOR_SIZE;
51 int length = sector_count * HD_SECTOR_SIZE;
53 PrintDebug("SymSwap: Reading %d bytes to %p from %p\n", length,
54 buf, (void *)(swap->swap_space + offset));
56 memcpy(buf, swap->swap_space + offset, length);
61 static int swap_write(uint8_t * buf, int sector_count, uint64_t lba, void * private_data) {
62 struct vm_device * dev = (struct vm_device *)private_data;
63 struct swap_state * swap = (struct swap_state *)(dev->private_data);
64 int offset = lba * HD_SECTOR_SIZE;
65 int length = sector_count * HD_SECTOR_SIZE;
67 PrintDebug("SymSwap: Writing %d bytes to %p from %p\n", length,
68 (void *)(swap->swap_space + offset), buf);
70 memcpy(swap->swap_space + offset, buf, length);
76 static int swap_free(struct vm_device * dev) {
81 static struct v3_hd_ops hd_ops = {
84 .get_capacity = swap_get_capacity,
89 static struct v3_device_ops dev_ops = {
99 static int swap_init(struct guest_info * vm, void * cfg_data) {
100 struct swap_state * swap = NULL;
101 struct vm_device * virtio_blk = v3_find_dev(vm, (char *)cfg_data);
104 PrintError("could not find Virtio backend\n");
108 PrintDebug("Creating Swap Device\n");
110 if (virtio_blk == NULL) {
111 PrintError("Swap device requires a virtio block device\n");
115 swap = (struct swap_state *)V3_Malloc(sizeof(struct swap_state));
117 swap->blk_dev = virtio_blk;
118 swap->capacity = SWAP_CAPACITY;
120 swap->swap_base_addr = (addr_t)V3_AllocPages(swap->capacity / 4096);
121 swap->swap_space = (uint8_t *)V3_VAddr((void *)(swap->swap_base_addr));
122 memset(swap->swap_space, 0, SWAP_CAPACITY);
125 struct vm_device * dev = v3_allocate_device("SYM_SWAP", &dev_ops, swap);
127 if (v3_attach_device(vm, dev) == -1) {
128 PrintError("Could not attach device %s\n", "SYM_SWAP");
133 v3_virtio_register_harddisk(virtio_blk, &hd_ops, dev);
140 device_register("SYM_SWAP", swap_init)