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".
21 #include <devices/os_debug.h>
22 #include <palacios/vmm.h>
26 #define DEBUG_PORT1 0xc0c0
30 char debug_buf[BUF_SIZE];
36 static int handle_gen_write(ushort_t port, void * src, uint_t length, struct vm_device * dev) {
37 struct debug_state * state = (struct debug_state *)dev->private_data;
39 state->debug_buf[state->debug_offset++] = *(char*)src;
41 if ((*(char*)src == 0xa) || (state->debug_offset == (BUF_SIZE - 1))) {
42 PrintDebug("VM_CONSOLE>%s", state->debug_buf);
43 memset(state->debug_buf, 0, BUF_SIZE);
44 state->debug_offset = 0;
51 static int debug_init(struct vm_device * dev) {
52 struct debug_state * state = (struct debug_state *)dev->private_data;
54 v3_dev_hook_io(dev, DEBUG_PORT1, NULL, &handle_gen_write);
56 state->debug_offset = 0;
57 memset(state->debug_buf, 0, BUF_SIZE);
62 static int debug_deinit(struct vm_device * dev) {
63 v3_dev_unhook_io(dev, DEBUG_PORT1);
72 static struct vm_device_ops dev_ops = {
74 .deinit = debug_deinit,
81 struct vm_device * v3_create_os_debug() {
82 struct debug_state * state = NULL;
84 state = (struct debug_state *)V3_Malloc(sizeof(struct debug_state));
86 PrintDebug("Creating OS Debug Device\n");
87 struct vm_device * device = v3_create_device("OS Debug", &dev_ops, state);