/*      $NetBSD: freebsd_sched.c,v 1.23 2021/09/07 11:43:03 riastradh Exp $     */

/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center; by Matthias Scheler.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/

/*
* FreeBSD compatibility module. Try to deal with scheduler related syscalls.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: freebsd_sched.c,v 1.23 2021/09/07 11:43:03 riastradh Exp $");

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/syscallargs.h>
#include <sys/kauth.h>

#include <sys/cpu.h>

#include <compat/freebsd/freebsd_syscallargs.h>
#include <compat/freebsd/freebsd_sched.h>

int
freebsd_sys_yield(struct lwp *l, const void *v, register_t *retval)
{

       yield();
       return 0;
}

/*
* XXX: Needs adjustment to do a proper conversion.
*/
static int
sched_freebsd2native(int freebsd_policy,
   const struct freebsd_sched_param *freebsd_params, int *native_policy,
   struct sched_param *native_params)
{
       int p;

       switch (freebsd_policy) {
       case FREEBSD_SCHED_OTHER:
               p = SCHED_OTHER;
               break;

       case FREEBSD_SCHED_FIFO:
               p = SCHED_FIFO;
               break;

       case FREEBSD_SCHED_RR:
               p = SCHED_RR;
               break;

       default:
               return EINVAL;
       }

       if (native_policy != NULL)
               *native_policy = p;

       if (freebsd_params != NULL && native_params != NULL) {
               /* XXX: Needs adjustment to do a proper conversion. */
               native_params->sched_priority = freebsd_params->sched_priority;
       }
       return 0;
}

static int
sched_native2freebsd(int native_policy, const struct sched_param *native_params,
   int *freebsd_policy, struct freebsd_sched_param *freebsd_params)
{
       int p;

       switch (native_policy) {
       case SCHED_OTHER:
               p = FREEBSD_SCHED_OTHER;
               break;

       case SCHED_FIFO:
               p = FREEBSD_SCHED_FIFO;
               break;

       case SCHED_RR:
               p = FREEBSD_SCHED_RR;
               break;

       default:
               return EINVAL;
       }

       if (freebsd_policy != NULL)
               *freebsd_policy = p;

       if (native_params != NULL && freebsd_params != NULL) {
               /* XXX: Needs adjustment to do a proper conversion. */
               memset(freebsd_params, 0, sizeof(*freebsd_params));
               freebsd_params->sched_priority = native_params->sched_priority;
       }

       return 0;
}

int
freebsd_sys_sched_setparam(struct lwp *l, const struct freebsd_sys_sched_setparam_args *uap, register_t *retval)
{
       /* {
               syscallarg(pid_t) pid;
               syscallarg(const struct freebsd_sched_param *) sp;
       } */
       int error, policy;
       struct freebsd_sched_param lp;
       struct sched_param sp;

       if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
               error = EINVAL;
               goto out;
       }

       error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
       if (error)
               goto out;

       /* We need the current policy in FreeBSD terms. */
       error = do_sched_getparam(SCARG(uap, pid), 0, &policy, NULL);
       if (error)
               goto out;
       error = sched_native2freebsd(policy, NULL, &policy, NULL);
       if (error)
               goto out;

       error = sched_freebsd2native(policy, &lp, &policy, &sp);
       if (error)
               goto out;

       error = do_sched_setparam(SCARG(uap, pid), 0, policy, &sp);
       if (error)
               goto out;

out:
       return error;
}

int
freebsd_sys_sched_getparam(struct lwp *l, const struct freebsd_sys_sched_getparam_args *uap, register_t *retval)
{
       /* {
               syscallarg(pid_t) pid;
               syscallarg(struct freebsd_sched_param *) sp;
       } */
       struct freebsd_sched_param lp;
       struct sched_param sp;
       int error;

       if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
               error = EINVAL;
               goto out;
       }

       error = do_sched_getparam(SCARG(uap, pid), 0, NULL, &sp);
       if (error)
               goto out;

       error = sched_native2freebsd(0, &sp, NULL, &lp);
       if (error)
               goto out;

       error = copyout(&lp, SCARG(uap, sp), sizeof(lp));
       if (error)
               goto out;

out:
       return error;
}

int
freebsd_sys_sched_setscheduler(struct lwp *l, const struct freebsd_sys_sched_setscheduler_args *uap, register_t *retval)
{
       /* {
               syscallarg(pid_t) pid;
               syscallarg(int) policy;
               syscallarg(cont struct freebsd_sched_scheduler *) sp;
       } */
       int error, policy;
       struct freebsd_sched_param lp;
       struct sched_param sp;

       if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
               error = EINVAL;
               goto out;
       }

       error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
       if (error)
               goto out;

       error = sched_freebsd2native(SCARG(uap, policy), &lp, &policy, &sp);
       if (error)
               goto out;

       error = do_sched_setparam(SCARG(uap, pid), 0, policy, &sp);
       if (error)
               goto out;

out:
       return error;
}

int
freebsd_sys_sched_getscheduler(struct lwp *l, const struct freebsd_sys_sched_getscheduler_args *uap, register_t *retval)
{
       /* {
               syscallarg(pid_t) pid;
       } */
       int error, policy;

       *retval = -1;

       error = do_sched_getparam(SCARG(uap, pid), 0, &policy, NULL);
       if (error)
               goto out;

       error = sched_native2freebsd(policy, NULL, &policy, NULL);
       if (error)
               goto out;

       *retval = policy;

out:
       return error;
}

int
freebsd_sys_sched_yield(struct lwp *l, const void *v, register_t *retval)
{

       yield();
       return 0;
}

int
freebsd_sys_sched_get_priority_max(struct lwp *l, const struct freebsd_sys_sched_get_priority_max_args *uap, register_t *retval)
{
       /* {
               syscallarg(int) policy;
       } */

       /*
        * We can't emulate anything put the default scheduling policy.
        */
       if (SCARG(uap, policy) != FREEBSD_SCHED_OTHER) {
               *retval = -1;
               return EINVAL;
       }

       *retval = 0;
       return 0;
}

int
freebsd_sys_sched_get_priority_min(struct lwp *l, const struct freebsd_sys_sched_get_priority_min_args *uap, register_t *retval)
{
       /* {
               syscallarg(int) policy;
       } */

       /*
        * We can't emulate anything put the default scheduling policy.
        */
       if (SCARG(uap, policy) != FREEBSD_SCHED_OTHER) {
               *retval = -1;
               return EINVAL;
       }

       *retval = 0;
       return 0;
}

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