bsd/dev/ppc/mem.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*-
  29  * Copyright (c) 1988 University of Utah.
  30  * Copyright (c) 1982, 1986, 1990, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * This code is derived from software contributed to Berkeley by
  34  * the Systems Programming Group of the University of Utah Computer
  35  * Science Department, and code derived from software contributed to
  36  * Berkeley by William Jolitz.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  * from: Utah $Hdr: mem.c 1.13 89/10/08$
  67  *      @(#)mem.c       8.1 (Berkeley) 6/11/93
  68  */
  69
  70 #include <mach_load.h>
  71
  72 /*
  73  * Memory special file
  74  */
  75
  76 #include <sys/param.h>
  77 #include <sys/dir.h>
  78 #include <sys/proc.h>
  79 #include <sys/systm.h>
  80 #include <sys/conf.h>
  81 #include <sys/vm.h>
  82 #include <sys/uio_internal.h>
  83 #include <sys/malloc.h>
  84
  85 #include <vm/pmap.h>
  86 #include <vm/vm_map.h>
  87 #include <vm/vm_kern.h>
  88 #include <mach/vm_param.h>
  89
  90 #include <ppc/Diagnostics.h>
  91 #include <ppc/mappings.h>
  92
  93 static caddr_t devzerobuf;
  94
  95 extern boolean_t kernacc(off_t, size_t );
  96 extern int setup_kmem;
  97
  98 int mmread(dev_t dev, struct uio *uio, int flag);
  99 int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw);
 100 int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
 101 int mmwrite(dev_t dev, struct uio *uio, int flag);
 102
 103 int
 104 mmread(dev_t dev, struct uio *uio, __unused int flag)
 105 {
 106
 107         return (mmrw(dev, uio, UIO_READ));
 108 }
 109
 110 int
 111 mmwrite(dev_t dev, struct uio *uio, __unused int flag)
 112 {
 113
 114         return (mmrw(dev, uio, UIO_WRITE));
 115 }
 116
 117 int
 118 mmioctl(dev_t dev, u_long cmd, __unused caddr_t data,
 119                 __unused int flag, __unused struct proc *p)
 120 {
 121         int minnum = minor(dev);
 122
 123         if ((setup_kmem == 0) && ((minnum == 0) || (minnum == 1)))
 124                 return(EINVAL);
 125
 126         switch (cmd) {
 127         case FIONBIO:
 128         case FIOASYNC:
 129                 /* OK to do nothing: we always return immediately */
 130                 break;
 131         default:
 132                 return ENODEV;
 133         }
 134
 135         return (0);
 136 }
 137
 138 int
 139 mmrw(dev, uio, rw)
 140         dev_t dev;
 141         struct uio *uio;
 142         enum uio_rw rw;
 143 {
 144         register int o;
 145 #if LP64KERN
 146         register uint64_t c;
 147 #else
 148         register uint c;
 149 #endif
 150         addr64_t vll;
 151         int error = 0;
 152         vm_offset_t     where;
 153
 154         while (uio_resid(uio) > 0 && error == 0) {
 155                 uio_update(uio, 0);
 156
 157                 switch (minor(dev)) {
 158
 159 /* minor device 0 is physical memory */
 160                 case 0:
 161                         if (setup_kmem == 0)
 162                                 return(ENODEV);
 163                         vll = trunc_page_64(uio->uio_offset);
 164                         if(((vll >> 31) == 1) || vll >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : max_mem))
 165                                 goto fault;
 166
 167                         if(dgWork.dgFlags & enaDiagDM) {                        /* Can we really get all memory? */
 168                                 if (kmem_alloc_pageable(kernel_map, &where, PAGE_SIZE) != KERN_SUCCESS) {
 169                                         goto fault;
 170                                 }
 171                                 else {
 172                                         addr64_t collad;
 173
 174                                         collad = mapping_make(kernel_pmap, (addr64_t)where, (ppnum_t)(vll >> 12), 0, 1, VM_PROT_READ);  /* Map it in for the moment */
 175                                         if(collad) {                                            /* See if it failed (shouldn't happen)  */
 176                                                 kmem_free(kernel_map, where, PAGE_SIZE);        /* Toss the page */
 177                                                 goto fault;                                             /* Kill the transfer */
 178                                         }
 179                                 }
 180                         }
 181                         else {
 182                                 if (kmem_alloc(kernel_map, &where, 4096)
 183                                         != KERN_SUCCESS) {
 184                                         goto fault;
 185                                 }
 186                         }
 187                         o = uio->uio_offset - vll;
 188                         c = min(PAGE_SIZE - o, uio_curriovlen(uio));
 189                         error = uiomove((caddr_t)(where + o), c, uio);
 190
 191                         if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, (addr64_t)where);      /* Unmap it */
 192                         kmem_free(kernel_map, where, PAGE_SIZE);
 193                         continue;
 194
 195                 /* minor device 1 is kernel memory */
 196                 case 1:
 197                         if (setup_kmem == 0)
 198                                 return(ENODEV);
 199                         /* Do some sanity checking */
 200                         if (((addr64_t)uio->uio_offset > vm_last_addr) ||
 201                                 ((addr64_t)uio->uio_offset < VM_MIN_KERNEL_ADDRESS))
 202                                 goto fault;
 203                         c = uio_curriovlen(uio);
 204                         if (!kernacc(uio->uio_offset, c))
 205                                 goto fault;
 206                         error = uiomove64(uio->uio_offset, c, uio);
 207                         continue;
 208
 209                 /* minor device 2 is EOF/RATHOLE */
 210                 case 2:
 211                         if (rw == UIO_READ)
 212                                 return (0);
 213                         c = uio_curriovlen(uio);
 214                         break;
 215                 /* minor device 3 is ZERO/RATHOLE */
 216                 case 3:
 217                         if(devzerobuf == NULL) {
 218                                 MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
 219                                 bzero(devzerobuf, PAGE_SIZE);
 220                         }
 221                         if(uio->uio_rw == UIO_WRITE) {
 222                                 c = uio_curriovlen(uio);
 223                                 break;
 224                         }
 225                         c = min(uio_curriovlen(uio), PAGE_SIZE);
 226                         error = uiomove(devzerobuf, c, uio);
 227                         continue;
 228                 default:
 229                         goto fault;
 230                         break;
 231                 }
 232
 233                 if (error)
 234                         break;
 235                 uio_update(uio, c);
 236         }
 237         return (error);
 238 fault:
 239         return (EFAULT);
 240 }
 241