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/*
* Kernel Virtual Machine (ala Linux KVM) pseudo-device.
* Provides access to hardware accelerated virtual CPUs.
*
* Copyright (c) 2010 Joyent Inc., All Rights Reserved.
*
*/
#include <sys/devops.h> /* used by dev_ops */
#include <sys/conf.h> /* used by dev_ops and cb_ops */
#include <sys/modctl.h> /* used by modlinkage, modldrv, _init, _info, and _fini */
#include <sys/types.h> /* used by open, close, read, write, prop_op, and ddi_prop_op */
#include <sys/file.h> /* used by open, close */
#include <sys/errno.h> /* used by open, close, read, write */
#include <sys/open.h> /* used by open, close, read, write */
#include <sys/cred.h> /* used by open, close, read */
#include <sys/uio.h> /* used by read */
#include <sys/stat.h> /* defines S_IFCHR used by ddi_create_minor_node */
#include <sys/cmn_err.h> /* used by all entry points for this driver */
#include <sys/ddi.h> /* used by all entry points for this driver */
#include <sys/sunddi.h> /* used by all entry points for this driver */
#include "kvm.h"
static int kvm_attach(dev_info_t *dip, ddi_attach_cmd_t cmd);
static int kvm_detach(dev_info_t *dip, ddi_detach_cmd_t cmd);
static int kvm_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp);
static int kvm_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
int flags, char *name, caddr_t valuep, int *lengthp);
static int kvm_open(dev_t *devp, int flag, int otyp, cred_t *cred);
static int kvm_close(dev_t dev, int flag, int otyp, cred_t *cred);
static int kvm_read(dev_t dev, struct uio *uiop, cred_t *credp);
static int kvm_write(dev_t dev, struct uio *uiop, cred_t *credp);
/* cb_ops structure */
static struct cb_ops kvm_cb_ops = {
kvm_open,
kvm_close,
nodev, /* no strategy - nodev returns ENXIO */
nodev, /* no print */
nodev, /* no dump */
kvm_read,
kvm_write,
nodev, /* no ioctl */
nodev, /* no devmap */
nodev, /* no mmap */
nodev, /* no segmap */
nochpoll, /* returns ENXIO for non-pollable devices */
kvm_prop_op,
NULL, /* streamtab struct; if not NULL, all above fields are ignored */
D_NEW | D_MP, /* compatibility flags: see conf.h */
CB_REV, /* cb_ops revision number */
nodev, /* no aread */
nodev /* no awrite */
};
/* dev_ops structure */
static struct dev_ops kvm_dev_ops = {
DEVO_REV,
0, /* reference count */
kvm_getinfo, /* getinfo(9E) */
nulldev, /* no identify(9E) - nulldev returns 0 */
nulldev, /* no probe(9E) */
kvm_attach,
kvm_detach,
nodev, /* no reset - nodev returns ENXIO */
&kvm_cb_ops,
(struct bus_ops *)NULL,
nodev, /* no power(9E) */
ddi_quiesce_not_needed, /* no quiesce(9E) */
};
/* modldrv structure */
static struct modldrv md = {
&mod_driverops, /* Type of module. This is a driver. */
"kvm driver", /* Name of the module. */
&kvm_dev_ops
};
/* modlinkage structure */
static struct modlinkage ml = {
MODREV_1,
&md,
NULL
};
/* dev_info structure */
dev_info_t *kvm_dip; /* keep track of one instance */
/* Loadable module configuration entry points */
int
_init(void)
{
cmn_err(CE_NOTE, "Inside _init");
return(mod_install(&ml));
}
int
_info(struct modinfo *modinfop)
{
cmn_err(CE_NOTE, "Inside _info");
return(mod_info(&ml, modinfop));
}
int
_fini(void)
{
cmn_err(CE_NOTE, "Inside _fini");
return(mod_remove(&ml));
}
/* Device configuration entry points */
static int
kvm_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
cmn_err(CE_NOTE, "Inside kvm_attach");
switch(cmd) {
case DDI_ATTACH:
kvm_dip = dip;
if (ddi_create_minor_node(dip, "0", S_IFCHR, ddi_get_instance(dip), DDI_PSEUDO,0) != DDI_SUCCESS) {
cmn_err(CE_NOTE, "%s%d: attach: could not add character node.", "kvm", 0);
return(DDI_FAILURE);
} else
return DDI_SUCCESS;
default:
return DDI_FAILURE;
}
}
static int
kvm_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
cmn_err(CE_NOTE, "Inside kvm_detach");
switch(cmd) {
case DDI_DETACH:
kvm_dip = 0;
ddi_remove_minor_node(dip, NULL);
return DDI_SUCCESS;
default:
return DDI_FAILURE;
}
}
static int
kvm_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp)
{
cmn_err(CE_NOTE, "Inside kvm_getinfo");
switch(cmd) {
case DDI_INFO_DEVT2DEVINFO:
*resultp = kvm_dip;
return DDI_SUCCESS;
case DDI_INFO_DEVT2INSTANCE:
*resultp = 0;
return DDI_SUCCESS;
default:
return DDI_FAILURE;
}
}
/* Main entry points */
static int
kvm_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
int flags, char *name, caddr_t valuep, int *lengthp)
{
cmn_err(CE_NOTE, "Inside kvm_prop_op");
return(ddi_prop_op(dev,dip,prop_op,flags,name,valuep,lengthp));
}
static int
kvm_open(dev_t *devp, int flag, int otyp, cred_t *cred)
{
cmn_err(CE_NOTE, "Inside kvm_open");
return DDI_SUCCESS;
}
static int
kvm_close(dev_t dev, int flag, int otyp, cred_t *cred)
{
cmn_err(CE_NOTE, "Inside kvm_close");
return DDI_SUCCESS;
}
static int
kvm_read(dev_t dev, struct uio *uiop, cred_t *credp)
{
cmn_err(CE_NOTE, "Inside kvm_read");
return DDI_SUCCESS;
}
static int
kvm_write(dev_t dev, struct uio *uiop, cred_t *credp)
{
cmn_err(CE_NOTE, "Inside kvm_write");
return DDI_SUCCESS;
}
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