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/vm.h>
  81 #include <sys/uio_internal.h>
  82 #include <sys/malloc.h>
  83
  84 #include <vm/pmap.h>
  85 #include <vm/vm_map.h>
  86 #include <vm/vm_kern.h>
  87 #include <mach/vm_param.h>
  88
  89 #include <ppc/Diagnostics.h>
  90 #include <ppc/mappings.h>
  91
  92 static caddr_t devzerobuf;
  93
  94 extern boolean_t kernacc(off_t, size_t );
  95 extern int setup_kmem;
  96
  97 int mmread(dev_t dev, struct uio *uio, int flag);
  98 int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw);
  99 int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
 100 int mmwrite(dev_t dev, struct uio *uio, int flag);
 101
 102 int
 103 mmread(dev_t dev, struct uio *uio, __unused int flag)
 104 {
 105
 106         return (mmrw(dev, uio, UIO_READ));
 107 }
 108
 109 int
 110 mmwrite(dev_t dev, struct uio *uio, __unused int flag)
 111 {
 112
 113         return (mmrw(dev, uio, UIO_WRITE));
 114 }
 115
 116 int
 117 mmioctl(dev_t dev, u_long cmd, __unused caddr_t data,
 118                 __unused int flag, __unused struct proc *p)
 119 {
 120         int minnum = minor(dev);
 121
 122         if ((setup_kmem == 0) && ((minnum == 0) || (minnum == 1)))
 123                 return(EINVAL);
 124
 125         switch (cmd) {
 126         case FIONBIO:
 127         case FIOASYNC:
 128                 /* OK to do nothing: we always return immediately */
 129                 break;
 130         default:
 131                 return ENODEV;
 132         }
 133
 134         return (0);
 135 }
 136
 137 int
 138 mmrw(dev, uio, rw)
 139         dev_t dev;
 140         struct uio *uio;
 141         enum uio_rw rw;
 142 {
 143         register int o;
 144 #if LP64KERN
 145         register uint64_t c;
 146 #else
 147         register uint c;
 148 #endif
 149         addr64_t vll;
 150         int error = 0;
 151         vm_offset_t     where;
 152
 153         while (uio_resid(uio) > 0 && error == 0) {
 154                 if (uio_iov_len(uio) == 0) {
 155                         uio_next_iov(uio);
 156                         uio->uio_iovcnt--;
 157                         if (uio->uio_iovcnt < 0)
 158                                 panic("mmrw");
 159                         continue;
 160                 }
 161                 switch (minor(dev)) {
 162
 163 /* minor device 0 is physical memory */
 164                 case 0:
 165                         if (setup_kmem == 0)
 166                                 return(ENODEV);
 167                         vll = trunc_page_64(uio->uio_offset);
 168                         if(((vll >> 31) == 1) || vll >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : max_mem))
 169                                 goto fault;
 170
 171                         if(dgWork.dgFlags & enaDiagDM) {                        /* Can we really get all memory? */
 172                                 if (kmem_alloc_pageable(kernel_map, &where, PAGE_SIZE) != KERN_SUCCESS) {
 173                                         goto fault;
 174                                 }
 175                                 else {
 176                                         addr64_t collad;
 177
 178                                         collad = mapping_make(kernel_pmap, (addr64_t)where, (ppnum_t)(vll >> 12), 0, 1, VM_PROT_READ);  /* Map it in for the moment */
 179                                         if(collad) {                                            /* See if it failed (shouldn't happen)  */
 180                                                 kmem_free(kernel_map, where, PAGE_SIZE);        /* Toss the page */
 181                                                 goto fault;                                             /* Kill the transfer */
 182                                         }
 183                                 }
 184                         }
 185                         else {
 186                                 if (kmem_alloc(kernel_map, &where, 4096)
 187                                         != KERN_SUCCESS) {
 188                                         goto fault;
 189                                 }
 190                         }
 191                         o = uio->uio_offset - vll;
 192                         // LP64todo - fix this!
 193                         c = min(PAGE_SIZE - o, uio_iov_len(uio));
 194                         error = uiomove((caddr_t)(where + o), c, uio);
 195
 196                         if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, (addr64_t)where);      /* Unmap it */
 197                         kmem_free(kernel_map, where, PAGE_SIZE);
 198                         continue;
 199
 200                 /* minor device 1 is kernel memory */
 201                 case 1:
 202                         if (setup_kmem == 0)
 203                                 return(ENODEV);
 204                         /* Do some sanity checking */
 205                         if (((addr64_t)uio->uio_offset > vm_last_addr) ||
 206                                 ((addr64_t)uio->uio_offset < VM_MIN_KERNEL_ADDRESS))
 207                                 goto fault;
 208                         c = uio_iov_len(uio);
 209                         if (!kernacc(uio->uio_offset, c))
 210                                 goto fault;
 211                         error = uiomove64(uio->uio_offset, c, uio);
 212                         continue;
 213
 214                 /* minor device 2 is EOF/RATHOLE */
 215                 case 2:
 216                         if (rw == UIO_READ)
 217                                 return (0);
 218                         c = uio_iov_len(uio);
 219                         break;
 220                 /* minor device 3 is ZERO/RATHOLE */
 221                 case 3:
 222                         if(devzerobuf == NULL) {
 223                                 MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
 224                                 bzero(devzerobuf, PAGE_SIZE);
 225                         }
 226                         if(uio->uio_rw == UIO_WRITE) {
 227                                 c = uio_iov_len(uio);
 228                                 break;
 229                         }
 230                         // LP64todo - fix this!
 231                         c = min(uio_iov_len(uio), PAGE_SIZE);
 232                         error = uiomove(devzerobuf, c, uio);
 233                         continue;
 234                 default:
 235                         goto fault;
 236                         break;
 237                 }
 238
 239                 if (error)
 240                         break;
 241                 uio_iov_base_add(uio, c);
 242                 uio->uio_offset += c;
 243 #if LP64KERN
 244                 uio_setresid(uio, (uio_resid(uio) - c));
 245                 uio_iov_len_add(uio, -((int64_t)c));
 246 #else
 247                 uio_setresid(uio, (uio_resid(uio) - c));
 248                 uio_iov_len_add(uio, -((int)c));
 249 #endif
 250         }
 251         return (error);
 252 fault:
 253         return (EFAULT);
 254 }
 255