/* $NetBSD: wsdisplay_compat_usl.c,v 1.54 2021/06/01 23:28:07 riastradh Exp $ */

/* $NetBSD: wsdisplay_compat_usl.c,v 1.54 2021/06/01 23:28:07 riastradh Exp $ */

/*
* Copyright (c) 1998
* Matthias Drochner. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: wsdisplay_compat_usl.c,v 1.54 2021/06/01 23:28:07 riastradh Exp $");

#ifdef _KERNEL_OPT
#include "opt_compat_freebsd.h"
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/errno.h>
#include <sys/kauth.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>
#include <dev/wscons/wscons_callbacks.h>
#include <dev/wscons/wsdisplay_usl_io.h>

#include "opt_wsdisplay_compat.h"

struct usl_syncdata {
struct wsscreen *s_scr;
struct proc *s_proc;
pid_t s_pid;
int s_flags;
#define SF_DETACHPENDING 1
#define SF_ATTACHPENDING 2
int s_acqsig, s_relsig;
int s_frsig; /* unused */
void (*s_callback)(void *, int, int);
void *s_cbarg;
callout_t s_attach_ch;
callout_t s_detach_ch;
};

static int usl_sync_init(struct wsscreen *, struct usl_syncdata **,
struct proc *, int, int, int);
static void usl_sync_done(struct usl_syncdata *);
static int usl_sync_check(void *);
static int usl_sync_check_sig(struct usl_syncdata *, int, int);
static struct usl_syncdata *usl_sync_get(struct wsscreen *);

static int usl_detachproc(void *, int, void (*)(void *, int, int), void *);
static int usl_detachack(struct usl_syncdata *, int);
static void usl_detachtimeout(void *);
static int usl_attachproc(void *, int, void (*)(void *, int, int), void *);
static int usl_attachack(struct usl_syncdata *, int);
static void usl_attachtimeout(void *);
static void usl_sync_destroy(void *);

static const struct wscons_syncops usl_syncops = {
.detach = usl_detachproc,
.attach = usl_attachproc,
.check = usl_sync_check,
.destroy = usl_sync_destroy,
};

#ifndef WSCOMPAT_USL_SYNCTIMEOUT
#define WSCOMPAT_USL_SYNCTIMEOUT 5 /* seconds */
#endif
static int wscompat_usl_synctimeout = WSCOMPAT_USL_SYNCTIMEOUT;

static int
usl_sync_init(struct wsscreen *scr, struct usl_syncdata **sdp,
struct proc *p, int acqsig, int relsig, int frsig)
{
struct usl_syncdata *sd;
int res;

sd = kmem_intr_alloc(sizeof(*sd), KM_SLEEP);

sd->s_scr = scr;
sd->s_proc = p;
sd->s_pid = p->p_pid;
sd->s_flags = 0;
sd->s_acqsig = acqsig;
sd->s_relsig = relsig;
sd->s_frsig = frsig;
callout_init(&sd->s_attach_ch, 0);
callout_setfunc(&sd->s_attach_ch, usl_attachtimeout, sd);
callout_init(&sd->s_detach_ch, 0);
callout_setfunc(&sd->s_detach_ch, usl_detachtimeout, sd);
res = wsscreen_attach_sync(scr, &usl_syncops, sd);
if (res) {
kmem_intr_free(sd, sizeof(*sd));
return res;
}
*sdp = sd;
return 0;
}

static void
usl_sync_done(struct usl_syncdata *sd)
{
if (sd->s_flags & SF_DETACHPENDING) {
callout_stop(&sd->s_detach_ch);
(*sd->s_callback)(sd->s_cbarg, 0, 0);
}
if (sd->s_flags & SF_ATTACHPENDING) {
callout_stop(&sd->s_attach_ch);
(*sd->s_callback)(sd->s_cbarg, ENXIO, 0);
}
wsscreen_detach_sync(sd->s_scr);
kmem_intr_free(sd, sizeof(*sd));
}

static int
usl_sync_check_sig(struct usl_syncdata *sd, int sig, int flags)
{

mutex_enter(&proc_lock);
if (sd->s_proc == proc_find(sd->s_pid)) {
sd->s_flags |= flags;
if (sig)
psignal(sd->s_proc, sig);
mutex_exit(&proc_lock);
return 1;
}
mutex_exit(&proc_lock);

printf("%s: process %d died\n", __func__, sd->s_pid);
usl_sync_done(sd);
return 0;
}

static int
usl_sync_check(void *vsd)
{

struct usl_syncdata *sd = vsd;
return usl_sync_check_sig(sd, 0, 0);
}

static struct usl_syncdata *
usl_sync_get(struct wsscreen *scr)
{
void *sd;

if (wsscreen_lookup_sync(scr, &usl_syncops, &sd))
return 0;
return sd;
}

static int
usl_detachproc(void *cookie, int waitok,
void (*callback)(void *, int, int), void *cbarg)
{
struct usl_syncdata *sd = cookie;

/* we really need a callback */
if (!callback)
return EINVAL;

/*
* Normally, this is called from the controlling process.
* Is is supposed to reply with a VT_RELDISP ioctl(), so
* it is not useful to tsleep() here.
*/
sd->s_callback = callback;
sd->s_cbarg = cbarg;
if (waitok) {
if (!usl_sync_check_sig(sd, sd->s_relsig, SF_DETACHPENDING))
return 0;
}

callout_schedule(&sd->s_detach_ch, wscompat_usl_synctimeout * hz);
return EAGAIN;
}

static int
usl_detachack(struct usl_syncdata *sd, int ack)
{
if (!(sd->s_flags & SF_DETACHPENDING)) {
printf("%s: not detaching\n", __func__);
return EINVAL;
}

callout_stop(&sd->s_detach_ch);
sd->s_flags &= ~SF_DETACHPENDING;

if (sd->s_callback)
(*sd->s_callback)(sd->s_cbarg, (ack ? 0 : EIO), 1);

return 0;
}

static void
usl_detachtimeout(void *arg)
{
struct usl_syncdata *sd = arg;

printf("%s\n", __func__);

if (!(sd->s_flags & SF_DETACHPENDING)) {
printf("%s: not detaching\n", __func__);
return;
}

sd->s_flags &= ~SF_DETACHPENDING;

if (sd->s_callback)
(*sd->s_callback)(sd->s_cbarg, EIO, 0);

(void) usl_sync_check(sd);
}

static int
usl_attachproc(void *cookie, int waitok,
void (*callback)(void *, int, int), void *cbarg)
{
struct usl_syncdata *sd = cookie;

/* we really need a callback */
if (!callback)
return EINVAL;

sd->s_callback = callback;
sd->s_cbarg = cbarg;
if (!usl_sync_check_sig(sd, sd->s_acqsig, SF_ATTACHPENDING))
return 0;

callout_schedule(&sd->s_attach_ch, wscompat_usl_synctimeout * hz);
return EAGAIN;
}

static int
usl_attachack(struct usl_syncdata *sd, int ack)
{
if (!(sd->s_flags & SF_ATTACHPENDING)) {
printf("%s: not attaching\n", __func__);
return EINVAL;
}

callout_stop(&sd->s_attach_ch);
sd->s_flags &= ~SF_ATTACHPENDING;

if (sd->s_callback)
(*sd->s_callback)(sd->s_cbarg, (ack ? 0 : EIO), 1);

return 0;
}

static void
usl_attachtimeout(void *arg)
{
struct usl_syncdata *sd = arg;

printf("%s\n", __func__);

if (!(sd->s_flags & SF_ATTACHPENDING)) {
printf("%s: not attaching\n", __func__);
return;
}

sd->s_flags &= ~SF_ATTACHPENDING;

if (sd->s_callback)
(*sd->s_callback)(sd->s_cbarg, EIO, 0);

(void) usl_sync_check(sd);
}

static void
usl_sync_destroy(void *cookie)
{
struct usl_syncdata *sd = cookie;

usl_sync_done(sd);
}

int
wsdisplay_usl_ioctl1(device_t dv, u_long cmd, void *data,
int flag, struct lwp *l)
{
struct wsdisplay_softc *sc = device_private(dv);
int idx, maxidx;

switch (cmd) {
case VT_OPENQRY:
maxidx = wsdisplay_maxscreenidx(sc);
for (idx = 0; idx <= maxidx; idx++) {
if (wsdisplay_screenstate(sc, idx) == 0) {
*(int *)data = idx + 1;
return 0;
}
}
return ENXIO;
case VT_GETACTIVE:
idx = wsdisplay_getactivescreen(sc);
*(int *)data = idx + 1;
return 0;
case VT_ACTIVATE:
/*
* a gross and disgusting hack to make this abused up ioctl,
* which is a gross and disgusting hack on its own, work on
* LP64/BE - we want the lower 32bit so we simply dereference
* the argument pointer as long. May cause problems with 32bit
* kernels on sparc64?
*/

idx = *(long *)data - 1;
if (idx < 0)
return EINVAL;
return wsdisplay_switch(dv, idx, 1);
case VT_WAITACTIVE:
idx = *(long *)data - 1;
if (idx < 0)
return EINVAL;
return wsscreen_switchwait(sc, idx);
case VT_GETSTATE:
#define ss ((struct vt_stat *)data)
idx = wsdisplay_getactivescreen(sc);
ss->v_active = idx + 1;
ss->v_state = 0;
maxidx = wsdisplay_maxscreenidx(sc);
for (idx = 0; idx <= maxidx; idx++)
if (wsdisplay_screenstate(sc, idx) == EBUSY)
ss->v_state |= (1 << (idx + 1));
#undef ss
return 0;

#ifdef WSDISPLAY_COMPAT_PCVT
case VGAPCVTID:
#define id ((struct pcvtid *)data)
strlcpy(id->name, "pcvt", sizeof(id->name));
id->rmajor = 3;
id->rminor = 32;
#undef id
return 0;
#endif
#ifdef WSDISPLAY_COMPAT_SYSCONS
case CONS_GETVERS:
*(int *)data = 0x200; /* version 2.0 */
return 0;
#endif

default:
return EPASSTHROUGH;
}
}

int
wsdisplay_usl_ioctl2(struct wsdisplay_softc *sc, struct wsscreen *scr,
u_long cmd, void *data, int flag, struct lwp *l)
{
struct proc *p = l->l_proc;
int intarg = 0, res;
u_long req;
void *arg;
struct usl_syncdata *sd;
struct wskbd_bell_data bd;

switch (cmd) {
case VT_SETMODE:
#define newmode ((struct vt_mode *)data)
if (newmode->mode == VT_PROCESS) {
res = usl_sync_init(scr, &sd, p, newmode->acqsig,
newmode->relsig, newmode->frsig);
if (res)
return res;
} else {
sd = usl_sync_get(scr);
if (sd)
usl_sync_done(sd);
}
#undef newmode
return 0;
case VT_GETMODE:
#define cmode ((struct vt_mode *)data)
sd = usl_sync_get(scr);
if (sd) {
cmode->mode = VT_PROCESS;
cmode->relsig = sd->s_relsig;
cmode->acqsig = sd->s_acqsig;
cmode->frsig = sd->s_frsig;
} else
cmode->mode = VT_AUTO;
#undef cmode
return 0;
case VT_RELDISP:
#define d (*(long *)data)
sd = usl_sync_get(scr);
if (!sd)
return EINVAL;
switch (d) {
case VT_FALSE:
case VT_TRUE:
return usl_detachack(sd, (d == VT_TRUE));
case VT_ACKACQ:
return usl_attachack(sd, 1);
default:
return EINVAL;
}
#undef d

case KDENABIO:
#if defined(__i386__) && (defined(COMPAT_11) || defined(COMPAT_FREEBSD))
if (kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_IOPL,
NULL, NULL, NULL, NULL) != 0)
return EPERM;
#endif
/* FALLTHRU */
case KDDISABIO:
#if defined(__i386__) && (defined(COMPAT_11) || defined(COMPAT_FREEBSD))
{
/* XXX NJWLWP */
struct trapframe *fp = (struct trapframe *)curlwp->l_md.md_regs;
if (cmd == KDENABIO)
fp->tf_eflags |= PSL_IOPL;
else
fp->tf_eflags &= ~PSL_IOPL;
}
#endif
return 0;
case KDSETRAD:
/* XXX ignore for now */
return 0;

default:
return EPASSTHROUGH;

/*
* the following are converted to wsdisplay ioctls
*/
case KDSETMODE:
req = WSDISPLAYIO_SMODE;
#define d (*(long *)data)
switch (d) {
case KD_GRAPHICS:
intarg = WSDISPLAYIO_MODE_MAPPED;
break;
case KD_TEXT:
intarg = WSDISPLAYIO_MODE_EMUL;
break;
default:
return EINVAL;
}
#undef d
arg = &intarg;
break;
case KDMKTONE:
req = WSKBDIO_COMPLEXBELL;
#define d (*(long *)data)
if (d) {
#define PCVT_SYSBEEPF 1193182
if (d >> 16) {
bd.which = WSKBD_BELL_DOPERIOD;
bd.period = d >> 16; /* ms */
}
else
bd.which = 0;
if (d & 0xffff) {
bd.which |= WSKBD_BELL_DOPITCH;
bd.pitch = PCVT_SYSBEEPF/(d & 0xffff); /* Hz */
}
} else
bd.which = 0; /* default */
#undef d
arg = &bd;
break;
case KDSETLED:
req = WSKBDIO_SETLEDS;
intarg = 0;
#define d (*(long *)data)
if (d & LED_CAP)
intarg |= WSKBD_LED_CAPS;
if (d & LED_NUM)
intarg |= WSKBD_LED_NUM;
if (d & LED_SCR)
intarg |= WSKBD_LED_SCROLL;
#undef d
arg = &intarg;
break;
case KDGETLED:
req = WSKBDIO_GETLEDS;
arg = &intarg;
break;
#ifdef WSDISPLAY_COMPAT_RAWKBD
case KDSKBMODE:
req = WSKBDIO_SETMODE;
switch (*(long *)data) {
case K_RAW:
intarg = WSKBD_RAW;
break;
case K_XLATE:
intarg = WSKBD_TRANSLATED;
break;
default:
return EINVAL;
}
arg = &intarg;
break;
case KDGKBMODE:
req = WSKBDIO_GETMODE;
arg = &intarg;
break;
#endif
}

res = wsdisplay_internal_ioctl(sc, scr, req, arg, flag, l);
if (res != EPASSTHROUGH)
return res;

switch (cmd) {
case KDGETLED:
#define d (*(int *)data)
d = 0;
if (intarg & WSKBD_LED_CAPS)
d |= LED_CAP;
if (intarg & WSKBD_LED_NUM)
d |= LED_NUM;
if (intarg & WSKBD_LED_SCROLL)
d |= LED_SCR;
#undef d
break;
#ifdef WSDISPLAY_COMPAT_RAWKBD
case KDGKBMODE:
*(int *)data = (intarg == WSKBD_RAW ? K_RAW : K_XLATE);
break;
#endif
}

return 0;
}