/* $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 __KERNEL_RCSID(0, "$NetBSD: freebsd_sched.c,v 1.23 2021/09/07 11:43:03 riastradh Exp $"); #include #include #include #include #include #include #include #include #include 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; }