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 (4096 * HD_SECTOR_SIZE)
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 return swap->capacity / HD_SECTOR_SIZE;
45 static int swap_read(uint8_t * buf, int sector_count, uint64_t lba, void * private_data) {
46 struct vm_device * dev = (struct vm_device *)private_data;
47 struct swap_state * swap = (struct swap_state *)(dev->private_data);
48 int offset = lba * HD_SECTOR_SIZE;
49 int length = sector_count * HD_SECTOR_SIZE;
51 PrintDebug("SymSwap: Reading %d bytes\n", length);
53 memcpy(buf, swap->swap_space + offset, length);
58 static int swap_write(uint8_t * buf, int sector_count, uint64_t lba, void * private_data) {
59 struct vm_device * dev = (struct vm_device *)private_data;
60 struct swap_state * swap = (struct swap_state *)(dev->private_data);
61 int offset = lba * HD_SECTOR_SIZE;
62 int length = sector_count * HD_SECTOR_SIZE;
64 PrintDebug("SymSwap: Writing %d bytes\n", length);
66 memcpy(swap->swap_space + offset, buf, length);
72 static int swap_free(struct vm_device * dev) {
77 static struct v3_hd_ops hd_ops = {
80 .get_capacity = swap_get_capacity,
85 static struct v3_device_ops dev_ops = {
95 static int swap_init(struct guest_info * vm, void * cfg_data) {
96 struct swap_state * swap = NULL;
97 struct vm_device * virtio_blk = v3_find_dev(vm, (char *)cfg_data);
100 PrintError("could not find Virtio backend\n");
104 PrintDebug("Creating Swap Device\n");
106 if (virtio_blk == NULL) {
107 PrintError("Swap device requires a virtio block device\n");
111 swap = (struct swap_state *)V3_Malloc(sizeof(struct swap_state));
113 swap->blk_dev = virtio_blk;
114 swap->capacity = SWAP_CAPACITY;
116 swap->swap_base_addr = (addr_t)V3_AllocPages(swap->capacity / 4096);
117 swap->swap_space = (uint8_t *)V3_VAddr((void *)(swap->swap_base_addr));
119 struct vm_device * dev = v3_allocate_device("SYM_SWAP", &dev_ops, swap);
121 if (v3_attach_device(vm, dev) == -1) {
122 PrintError("Could not attach device %s\n", "SYM_SWAP");
127 v3_virtio_register_harddisk(virtio_blk, &hd_ops, dev);
134 device_register("SYM_SWAP", swap_init)