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/* VirtualBox driver - by D.C. van Moolenbroek */
/*
* This driver currently performs two tasks:
* - synchronizing to the host system time;
* - providing an interface for HGCM communication with the host system.
*/
#include <minix/sysutil.h>
#include <minix/drivers.h>
#include <minix/driver.h>
#include <minix/optset.h>
#include <machine/pci.h>
#include <sys/time.h>
#include "vmmdev.h"
#include "proto.h"
#define DEFAULT_INTERVAL 1 /* check host time every second */
#define DEFAULT_DRIFT 2 /* update time if delta is >= 2 secs */
static void *vir_ptr;
static phys_bytes phys_ptr;
static port_t port;
static u32_t ticks;
static int interval;
static int drift;
static unsigned int irq;
static int hook_id;
static struct optset optset_table[] = {
{ "interval", OPT_INT, &interval, 10 },
{ "drift", OPT_INT, &drift, 10 },
{ NULL, 0, NULL, 0 }
};
/*===========================================================================*
* vbox_request *
*===========================================================================*/
int vbox_request(struct VMMDevRequestHeader *header, phys_bytes addr,
int type, size_t size)
{
/* Perform a VirtualBox backdoor request. */
int r;
header->size = size;
header->version = VMMDEV_BACKDOOR_VERSION;
header->type = type;
header->result = VMMDEV_ERR_GENERIC;
if ((r = sys_outl(port, addr)) != OK)
panic("device I/O failed: %d", r);
return header->result;
}
/*===========================================================================*
* vbox_update_time *
*===========================================================================*/
static void vbox_update_time(void)
{
/* Update the current time if it has drifted too far. */
struct VMMDevReqHostTime *req;
time_t otime, ntime;
req = (struct VMMDevReqHostTime *) vir_ptr;
if (vbox_request(&req->header, phys_ptr, VMMDEV_REQ_HOSTTIME,
sizeof(*req)) == VMMDEV_ERR_OK) {
time(&otime); /* old time */
ntime = req->time / 1000; /* new time */
/* Make time go forward, if the difference exceeds the drift
* threshold. Never make time go backward.
*/
if ((ntime - otime) >= drift)
stime(&ntime);
}
sys_setalarm(ticks, 0);
}
/*===========================================================================*
* vbox_init *
*===========================================================================*/
static int vbox_init(int UNUSED(type), sef_init_info_t *UNUSED(info))
{
/* Initialize the device. */
int devind;
u16_t vid, did;
struct VMMDevReportGuestInfo *req;
int r;
interval = DEFAULT_INTERVAL;
drift = DEFAULT_DRIFT;
if (env_argc > 1)
optset_parse(optset_table, env_argv[1]);
pci_init();
r = pci_first_dev(&devind, &vid, &did);
for (;;) {
if (r != 1)
panic("backdoor device not found");
if (vid == VMMDEV_PCI_VID && did == VMMDEV_PCI_DID)
break;
r = pci_next_dev(&devind, &vid, &did);
}
pci_reserve(devind);
port = pci_attr_r32(devind, PCI_BAR) & PCI_BAR_IO_MASK;
irq = pci_attr_r8(devind, PCI_ILR);
hook_id = 0;
if ((r = sys_irqsetpolicy(irq, 0 /* IRQ_REENABLE */, &hook_id)) != OK)
panic("unable to register IRQ: %d", r);
if ((r = sys_irqenable(&hook_id)) != OK)
panic("unable to enable IRQ: %d", r);
if ((vir_ptr = alloc_contig(VMMDEV_BUF_SIZE, 0, &phys_ptr)) == NULL)
panic("unable to allocate memory");
req = (struct VMMDevReportGuestInfo *) vir_ptr;
req->add_version = VMMDEV_GUEST_VERSION;
req->os_type = VMMDEV_GUEST_OS_OTHER;
if ((r = vbox_request(&req->header, phys_ptr,
VMMDEV_REQ_REPORTGUESTINFO, sizeof(*req))) !=
VMMDEV_ERR_OK)
panic("backdoor device not functioning");
ticks = sys_hz() * interval;
/*
* Do the first time update immediately. If the time changes
* significantly, there may otherwise be interference with rc scripts.
*/
vbox_update_time();
return OK;
}
/*===========================================================================*
* vbox_intr *
*===========================================================================*/
static void vbox_intr(void)
{
/* Process an interrupt. */
struct VMMDevEvents *req;
int r;
req = (struct VMMDevEvents *) vir_ptr;
req->events = 0;
/* If we cannot retrieve the events mask, we cannot do anything with
* this or any future interrupt either, so return without reenabling
* interrupts.
*/
if ((r = vbox_request(&req->header, phys_ptr,
VMMDEV_REQ_ACKNOWLEDGEEVENTS, sizeof(*req))) !=
VMMDEV_ERR_OK) {
printf("VBOX: unable to retrieve event mask (%d)\n", r);
return;
}
if (req->events & VMMDEV_EVENT_HGCM)
hgcm_intr();
if ((r = sys_irqenable(&hook_id)) != OK)
panic("unable to reenable IRQ: %d", r);
}
/*===========================================================================*
* vbox_signal *
*===========================================================================*/
static void vbox_signal(int signo)
{
/* Process a signal. If it is a SIGTERM, terminate immediately. */
if (signo != SIGTERM) return;
exit(0);
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
static void sef_local_startup(void)
{
/* Perform local SEF initialization. */
sef_setcb_init_fresh(vbox_init);
sef_setcb_init_restart(vbox_init);
sef_setcb_signal_handler(vbox_signal);
sef_startup();
}
/*===========================================================================*
* main *
*===========================================================================*/
int main(int argc, char **argv)
{
/* The main message loop. */
message m;
int r, ipc_status;
env_setargs(argc, argv);
sef_local_startup();
while (TRUE) {
if ((r = driver_receive(ANY, &m, &ipc_status)) != OK)
panic("driver_receive failed: %d", r);
if (is_ipc_notify(ipc_status)) {
switch (m.m_source) {
case HARDWARE:
vbox_intr();
break;
case CLOCK:
vbox_update_time();
break;
default:
printf("VBOX: received notify from %d\n",
m.m_source);
}
continue;
}
hgcm_message(&m, ipc_status);
}
return 0;
}
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