sys/compat/freebsd/freebsd_sched.c

   1 /*      $NetBSD: freebsd_sched.c,v 1.18 2008/02/29 08:41:51 dogcow Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
   9  * NASA Ames Research Center; by Matthias Scheler.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * FreeBSD compatibility module. Try to deal with scheduler related syscalls.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __KERNEL_RCSID(0, "$NetBSD: freebsd_sched.c,v 1.18 2008/02/29 08:41:51 dogcow Exp $");
  39
  40 #include <sys/param.h>
  41 #include <sys/mount.h>
  42 #include <sys/proc.h>
  43 #include <sys/systm.h>
  44 #include <sys/syscallargs.h>
  45 #include <sys/kauth.h>
  46
  47 #include <sys/cpu.h>
  48
  49 #include <compat/freebsd/freebsd_syscallargs.h>
  50 #include <compat/freebsd/freebsd_sched.h>
  51
  52 int
  53 freebsd_sys_yield(struct lwp *l, const void *v, register_t *retval)
  54 {
  55
  56         yield();
  57         return 0;
  58 }
  59
  60 /*
  61  * XXX: Needs adjustment to do a proper conversion.
  62  */
  63 static int
  64 sched_freebsd2native(int freebsd_policy,
  65     struct freebsd_sched_param *freebsd_params, int *native_policy,
  66     struct sched_param *native_params)
  67 {
  68         int error;
  69
  70         error = 0;
  71
  72         switch (freebsd_policy) {
  73         case FREEBSD_SCHED_OTHER:
  74                 *native_policy = SCHED_OTHER;
  75                 break;
  76
  77         case FREEBSD_SCHED_FIFO:
  78                 *native_policy = SCHED_FIFO;
  79                 break;
  80
  81         case FREEBSD_SCHED_RR:
  82                 *native_policy = SCHED_RR;
  83                 break;
  84
  85         default:
  86                 error = EINVAL;
  87                 break;
  88         }
  89
  90         if (freebsd_params != NULL && native_params != NULL && !error) {
  91                 native_params = (struct sched_param *)freebsd_params;
  92         }
  93
  94         return (error);
  95 }
  96
  97 /*
  98  * XXX: Needs adjustment to do a proper conversion.
  99  */
 100 static int
 101 sched_native2freebsd(int native_policy, struct sched_param *native_params,
 102     int *freebsd_policy, struct freebsd_sched_param *freebsd_params)
 103 {
 104         int error;
 105
 106         error = 0;
 107
 108         switch (native_policy) {
 109         case SCHED_OTHER:
 110                 *freebsd_policy = FREEBSD_SCHED_OTHER;
 111                 break;
 112
 113         case SCHED_FIFO:
 114                 *freebsd_policy = FREEBSD_SCHED_FIFO;
 115                 break;
 116
 117         case SCHED_RR:
 118                 *freebsd_policy = FREEBSD_SCHED_RR;
 119                 break;
 120
 121         default:
 122                 error = EINVAL;
 123                 break;
 124         }
 125
 126         if (native_params != NULL && freebsd_params != NULL && !error) {
 127                 freebsd_params = (struct freebsd_sched_param *)native_params;
 128         }
 129
 130         return (error);
 131 }
 132
 133 int
 134 freebsd_sys_sched_setparam(struct lwp *l, const struct freebsd_sys_sched_setparam_args *uap, register_t *retval)
 135 {
 136         /* {
 137                 syscallarg(pid_t) pid;
 138                 syscallarg(const struct freebsd_sched_param *) sp;
 139         } */
 140         int error, policy;
 141         struct freebsd_sched_param lp;
 142         struct sched_param sp;
 143
 144         if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
 145                 error = EINVAL;
 146                 goto out;
 147         }
 148
 149         error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
 150         if (error)
 151                 goto out;
 152
 153         /* We need the current policy in FreeBSD terms. */
 154         error = do_sched_getparam(SCARG(uap, pid), 0, &policy, NULL);
 155         if (error)
 156                 goto out;
 157         error = sched_native2freebsd(policy, NULL, &policy, NULL);
 158         if (error)
 159                 goto out;
 160
 161         error = sched_freebsd2native(policy, &lp, &policy, &sp);
 162         if (error)
 163                 goto out;
 164
 165         error = do_sched_setparam(SCARG(uap, pid), 0, policy, &sp);
 166         if (error)
 167                 goto out;
 168
 169  out:
 170         return error;
 171 }
 172
 173 int
 174 freebsd_sys_sched_getparam(struct lwp *l, const struct freebsd_sys_sched_getparam_args *uap, register_t *retval)
 175 {
 176         /* {
 177                 syscallarg(pid_t) pid;
 178                 syscallarg(struct freebsd_sched_param *) sp;
 179         } */
 180         struct freebsd_sched_param lp;
 181         struct sched_param sp;
 182         int error;
 183
 184         if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
 185                 error = EINVAL;
 186                 goto out;
 187         }
 188
 189         error = do_sched_getparam(SCARG(uap, pid), 0, NULL, &sp);
 190         if (error)
 191                 goto out;
 192
 193         error = sched_native2freebsd(0, &sp, NULL, &lp);
 194         if (error)
 195                 goto out;
 196
 197         error = copyout(&lp, SCARG(uap, sp), sizeof(lp));
 198         if (error)
 199                 goto out;
 200
 201  out:
 202         return (error);
 203 }
 204
 205 int
 206 freebsd_sys_sched_setscheduler(struct lwp *l, const struct freebsd_sys_sched_setscheduler_args *uap, register_t *retval)
 207 {
 208         /* {
 209                 syscallarg(pid_t) pid;
 210                 syscallarg(int) policy;
 211                 syscallarg(cont struct freebsd_sched_scheduler *) sp;
 212         } */
 213         int error, policy;
 214         struct freebsd_sched_param lp;
 215         struct sched_param sp;
 216
 217         if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
 218                 error = EINVAL;
 219                 goto out;
 220         }
 221
 222         error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
 223         if (error)
 224                 goto out;
 225
 226         error = sched_freebsd2native(SCARG(uap, policy), &lp, &policy, &sp);
 227         if (error)
 228                 goto out;
 229
 230         error = do_sched_setparam(SCARG(uap, pid), 0, policy, &sp);
 231         if (error)
 232                 goto out;
 233
 234  out:
 235         return error;
 236 }
 237
 238 int
 239 freebsd_sys_sched_getscheduler(struct lwp *l, const struct freebsd_sys_sched_getscheduler_args *uap, register_t *retval)
 240 {
 241         /* {
 242                 syscallarg(pid_t) pid;
 243         } */
 244         int error, policy;
 245
 246         *retval = -1;
 247
 248         error = do_sched_getparam(SCARG(uap, pid), 0, &policy, NULL);
 249         if (error)
 250                 goto out;
 251
 252         error = sched_native2freebsd(policy, NULL, &policy, NULL);
 253         if (error)
 254                 goto out;
 255
 256         *retval = policy;
 257
 258  out:
 259         return error;
 260 }
 261
 262 int
 263 freebsd_sys_sched_yield(struct lwp *l, const void *v, register_t *retval)
 264 {
 265
 266         yield();
 267         return 0;
 268 }
 269
 270 int
 271 freebsd_sys_sched_get_priority_max(struct lwp *l, const struct freebsd_sys_sched_get_priority_max_args *uap, register_t *retval)
 272 {
 273         /* {
 274                 syscallarg(int) policy;
 275         } */
 276
 277         /*
 278          * We can't emulate anything put the default scheduling policy.
 279          */
 280         if (SCARG(uap, policy) != FREEBSD_SCHED_OTHER) {
 281                 *retval = -1;
 282                 return EINVAL;
 283         }
 284
 285         *retval = 0;
 286         return 0;
 287 }
 288
 289 int
 290 freebsd_sys_sched_get_priority_min(struct lwp *l, const struct freebsd_sys_sched_get_priority_min_args *uap, register_t *retval)
 291 {
 292         /* {
 293                 syscallarg(int) policy;
 294         } */
 295
 296         /*
 297          * We can't emulate anything put the default scheduling policy.
 298          */
 299         if (SCARG(uap, policy) != FREEBSD_SCHED_OTHER) {
 300                 *retval = -1;
 301                 return EINVAL;
 302         }
 303
 304         *retval = 0;
 305         return 0;
 306 }