bsd/dev/ppc/mem.c

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*-
  31  * Copyright (c) 1988 University of Utah.
  32  * Copyright (c) 1982, 1986, 1990, 1993
  33  *      The Regents of the University of California.  All rights reserved.
  34  *
  35  * This code is derived from software contributed to Berkeley by
  36  * the Systems Programming Group of the University of Utah Computer
  37  * Science Department, and code derived from software contributed to
  38  * Berkeley by William Jolitz.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  * 3. All advertising materials mentioning features or use of this software
  49  *    must display the following acknowledgement:
  50  *      This product includes software developed by the University of
  51  *      California, Berkeley and its contributors.
  52  * 4. Neither the name of the University nor the names of its contributors
  53  *    may be used to endorse or promote products derived from this software
  54  *    without specific prior written permission.
  55  *
  56  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  57  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  58  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  59  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  60  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  61  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  62  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  63  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  64  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  65  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  66  * SUCH DAMAGE.
  67  *
  68  * from: Utah $Hdr: mem.c 1.13 89/10/08$
  69  *      @(#)mem.c       8.1 (Berkeley) 6/11/93
  70  */
  71
  72 #include <mach_load.h>
  73
  74 /*
  75  * Memory special file
  76  */
  77
  78 #include <sys/param.h>
  79 #include <sys/dir.h>
  80 #include <sys/proc.h>
  81 #include <sys/systm.h>
  82 #include <sys/vm.h>
  83 #include <sys/uio_internal.h>
  84 #include <sys/malloc.h>
  85
  86 #include <vm/pmap.h>
  87 #include <vm/vm_map.h>
  88 #include <vm/vm_kern.h>
  89 #include <mach/vm_param.h>
  90
  91 #include <ppc/Diagnostics.h>
  92 #include <ppc/mappings.h>
  93
  94 static caddr_t devzerobuf;
  95
  96 extern pmap_t kernel_pmap;
  97 extern boolean_t kernacc(off_t, size_t );
  98
  99 int mmread(dev_t dev, struct uio *uio);
 100 int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw);
 101 int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
 102 int mmwrite(dev_t dev, struct uio *uio);
 103
 104 int
 105 mmread(dev, uio)
 106         dev_t dev;
 107         struct uio *uio;
 108 {
 109
 110         return (mmrw(dev, uio, UIO_READ));
 111 }
 112
 113 int
 114 mmwrite(dev, uio)
 115         dev_t dev;
 116         struct uio *uio;
 117 {
 118
 119         return (mmrw(dev, uio, UIO_WRITE));
 120 }
 121
 122 int
 123 mmioctl(__unused dev_t dev, u_long cmd, __unused caddr_t data,
 124                 __unused int flag, __unused struct proc *p)
 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                 if (uio_iov_len(uio) == 0) {
 156                         uio_next_iov(uio);
 157                         uio->uio_iovcnt--;
 158                         if (uio->uio_iovcnt < 0)
 159                                 panic("mmrw");
 160                         continue;
 161                 }
 162                 switch (minor(dev)) {
 163
 164 /* minor device 0 is physical memory */
 165                 case 0:
 166                         vll = trunc_page_64(uio->uio_offset);
 167                         if(((vll >> 31) == 1) || vll >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : max_mem))
 168                                 goto fault;
 169
 170                         if(dgWork.dgFlags & enaDiagDM) {                        /* Can we really get all memory? */
 171                                 if (kmem_alloc_pageable(kernel_map, &where, PAGE_SIZE) != KERN_SUCCESS) {
 172                                         goto fault;
 173                                 }
 174                                 else {
 175                                         addr64_t collad;
 176
 177                                         collad = mapping_make(kernel_pmap, (addr64_t)where, (ppnum_t)(vll >> 12), 0, 1, VM_PROT_READ);  /* Map it in for the moment */
 178                                         if(collad) {                                            /* See if it failed (shouldn't happen)  */
 179                                                 kmem_free(kernel_map, where, PAGE_SIZE);        /* Toss the page */
 180                                                 goto fault;                                             /* Kill the transfer */
 181                                         }
 182                                 }
 183                         }
 184                         else {
 185                                 if (kmem_alloc(kernel_map, &where, 4096)
 186                                         != KERN_SUCCESS) {
 187                                         goto fault;
 188                                 }
 189                         }
 190                         o = uio->uio_offset - vll;
 191                         // LP64todo - fix this!
 192                         c = min(PAGE_SIZE - o, uio_iov_len(uio));
 193                         error = uiomove((caddr_t)(where + o), c, uio);
 194
 195                         if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, (addr64_t)where);      /* Unmap it */
 196                         kmem_free(kernel_map, where, PAGE_SIZE);
 197                         continue;
 198
 199                 /* minor device 1 is kernel memory */
 200                 case 1:
 201                         /* Do some sanity checking */
 202                         if (((addr64_t)uio->uio_offset > vm_last_addr) ||
 203                                 ((addr64_t)uio->uio_offset < VM_MIN_KERNEL_ADDRESS))
 204                                 goto fault;
 205                         c = uio_iov_len(uio);
 206                         if (!kernacc(uio->uio_offset, c))
 207                                 goto fault;
 208                         error = uiomove64(uio->uio_offset, c, uio);
 209                         continue;
 210
 211                 /* minor device 2 is EOF/RATHOLE */
 212                 case 2:
 213                         if (rw == UIO_READ)
 214                                 return (0);
 215                         c = uio_iov_len(uio);
 216                         break;
 217                 /* minor device 3 is ZERO/RATHOLE */
 218                 case 3:
 219                         if(devzerobuf == NULL) {
 220                                 MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
 221                                 bzero(devzerobuf, PAGE_SIZE);
 222                         }
 223                         if(uio->uio_rw == UIO_WRITE) {
 224                                 c = uio_iov_len(uio);
 225                                 break;
 226                         }
 227                         // LP64todo - fix this!
 228                         c = min(uio_iov_len(uio), PAGE_SIZE);
 229                         error = uiomove(devzerobuf, c, uio);
 230                         continue;
 231                 default:
 232                         goto fault;
 233                         break;
 234                 }
 235
 236                 if (error)
 237                         break;
 238                 uio_iov_base_add(uio, c);
 239                 uio->uio_offset += c;
 240 #if LP64KERN
 241                 uio_setresid(uio, (uio_resid(uio) - c));
 242                 uio_iov_len_add(uio, -((int64_t)c));
 243 #else
 244                 uio_setresid(uio, (uio_resid(uio) - c));
 245                 uio_iov_len_add(uio, -((int)c));
 246 #endif
 247         }
 248         return (error);
 249 fault:
 250         return (EFAULT);
 251 }
 252