bsd/dev/ppc/mem.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*-
  24  * Copyright (c) 1988 University of Utah.
  25  * Copyright (c) 1982, 1986, 1990, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * This code is derived from software contributed to Berkeley by
  29  * the Systems Programming Group of the University of Utah Computer
  30  * Science Department, and code derived from software contributed to
  31  * Berkeley by William Jolitz.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. All advertising materials mentioning features or use of this software
  42  *    must display the following acknowledgement:
  43  *      This product includes software developed by the University of
  44  *      California, Berkeley and its contributors.
  45  * 4. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  * from: Utah $Hdr: mem.c 1.13 89/10/08$
  62  *      @(#)mem.c       8.1 (Berkeley) 6/11/93
  63  */
  64
  65 #include <mach_load.h>
  66
  67 /*
  68  * Memory special file
  69  */
  70
  71 #include <sys/param.h>
  72 #include <sys/dir.h>
  73 #include <sys/proc.h>
  74 #include <sys/systm.h>
  75 #include <sys/vm.h>
  76 #include <sys/uio_internal.h>
  77 #include <sys/malloc.h>
  78
  79 #include <vm/pmap.h>
  80 #include <vm/vm_map.h>
  81 #include <vm/vm_kern.h>
  82 #include <mach/vm_param.h>
  83
  84 #include <ppc/Diagnostics.h>
  85 #include <ppc/mappings.h>
  86
  87 static caddr_t devzerobuf;
  88
  89 extern pmap_t kernel_pmap;
  90 extern boolean_t kernacc(off_t, size_t );
  91
  92 int mmread(dev_t dev, struct uio *uio);
  93 int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw);
  94 int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
  95 int mmwrite(dev_t dev, struct uio *uio);
  96
  97 int
  98 mmread(dev, uio)
  99         dev_t dev;
 100         struct uio *uio;
 101 {
 102
 103         return (mmrw(dev, uio, UIO_READ));
 104 }
 105
 106 int
 107 mmwrite(dev, uio)
 108         dev_t dev;
 109         struct uio *uio;
 110 {
 111
 112         return (mmrw(dev, uio, UIO_WRITE));
 113 }
 114
 115 int
 116 mmioctl(__unused dev_t dev, u_long cmd, __unused caddr_t data,
 117                 __unused int flag, __unused struct proc *p)
 118 {
 119         switch (cmd) {
 120         case FIONBIO:
 121         case FIOASYNC:
 122                 /* OK to do nothing: we always return immediately */
 123                 break;
 124         default:
 125                 return ENODEV;
 126         }
 127
 128         return (0);
 129 }
 130
 131 int
 132 mmrw(dev, uio, rw)
 133         dev_t dev;
 134         struct uio *uio;
 135         enum uio_rw rw;
 136 {
 137         register int o;
 138 #if LP64KERN
 139         register uint64_t c;
 140 #else
 141         register uint c;
 142 #endif
 143         addr64_t vll;
 144         int error = 0;
 145         vm_offset_t     where;
 146
 147         while (uio_resid(uio) > 0 && error == 0) {
 148                 if (uio_iov_len(uio) == 0) {
 149                         uio_next_iov(uio);
 150                         uio->uio_iovcnt--;
 151                         if (uio->uio_iovcnt < 0)
 152                                 panic("mmrw");
 153                         continue;
 154                 }
 155                 switch (minor(dev)) {
 156
 157 /* minor device 0 is physical memory */
 158                 case 0:
 159                         vll = trunc_page_64(uio->uio_offset);
 160                         if(((vll >> 31) == 1) || vll >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : max_mem))
 161                                 goto fault;
 162
 163                         if(dgWork.dgFlags & enaDiagDM) {                        /* Can we really get all memory? */
 164                                 if (kmem_alloc_pageable(kernel_map, &where, PAGE_SIZE) != KERN_SUCCESS) {
 165                                         goto fault;
 166                                 }
 167                                 else {
 168                                         addr64_t collad;
 169
 170                                         collad = mapping_make(kernel_pmap, (addr64_t)where, (ppnum_t)(vll >> 12), 0, 1, VM_PROT_READ);  /* Map it in for the moment */
 171                                         if(collad) {                                            /* See if it failed (shouldn't happen)  */
 172                                                 kmem_free(kernel_map, where, PAGE_SIZE);        /* Toss the page */
 173                                                 goto fault;                                             /* Kill the transfer */
 174                                         }
 175                                 }
 176                         }
 177                         else {
 178                                 if (kmem_alloc(kernel_map, &where, 4096)
 179                                         != KERN_SUCCESS) {
 180                                         goto fault;
 181                                 }
 182                         }
 183                         o = uio->uio_offset - vll;
 184                         // LP64todo - fix this!
 185                         c = min(PAGE_SIZE - o, uio_iov_len(uio));
 186                         error = uiomove((caddr_t)(where + o), c, uio);
 187
 188                         if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, (addr64_t)where);      /* Unmap it */
 189                         kmem_free(kernel_map, where, PAGE_SIZE);
 190                         continue;
 191
 192                 /* minor device 1 is kernel memory */
 193                 case 1:
 194                         /* Do some sanity checking */
 195                         if (((addr64_t)uio->uio_offset > vm_last_addr) ||
 196                                 ((addr64_t)uio->uio_offset < VM_MIN_KERNEL_ADDRESS))
 197                                 goto fault;
 198                         c = uio_iov_len(uio);
 199                         if (!kernacc(uio->uio_offset, c))
 200                                 goto fault;
 201                         error = uiomove64(uio->uio_offset, c, uio);
 202                         continue;
 203
 204                 /* minor device 2 is EOF/RATHOLE */
 205                 case 2:
 206                         if (rw == UIO_READ)
 207                                 return (0);
 208                         c = uio_iov_len(uio);
 209                         break;
 210                 /* minor device 3 is ZERO/RATHOLE */
 211                 case 3:
 212                         if(devzerobuf == NULL) {
 213                                 MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
 214                                 bzero(devzerobuf, PAGE_SIZE);
 215                         }
 216                         if(uio->uio_rw == UIO_WRITE) {
 217                                 c = uio_iov_len(uio);
 218                                 break;
 219                         }
 220                         // LP64todo - fix this!
 221                         c = min(uio_iov_len(uio), PAGE_SIZE);
 222                         error = uiomove(devzerobuf, c, uio);
 223                         continue;
 224                 default:
 225                         goto fault;
 226                         break;
 227                 }
 228
 229                 if (error)
 230                         break;
 231                 uio_iov_base_add(uio, c);
 232                 uio->uio_offset += c;
 233 #if LP64KERN
 234                 uio_setresid(uio, (uio_resid(uio) - c));
 235                 uio_iov_len_add(uio, -((int64_t)c));
 236 #else
 237                 uio_setresid(uio, (uio_resid(uio) - c));
 238                 uio_iov_len_add(uio, -((int)c));
 239 #endif
 240         }
 241         return (error);
 242 fault:
 243         return (EFAULT);
 244 }
 245