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  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*-
  23  * Copyright (c) 1988 University of Utah.
  24  * Copyright (c) 1982, 1986, 1990, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * This code is derived from software contributed to Berkeley by
  28  * the Systems Programming Group of the University of Utah Computer
  29  * Science Department, and code derived from software contributed to
  30  * Berkeley by William Jolitz.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  * from: Utah $Hdr: mem.c 1.13 89/10/08$
  61  *      @(#)mem.c       8.1 (Berkeley) 6/11/93
  62  */
  63
  64 #include <mach_load.h>
  65
  66 /*
  67  * Memory special file
  68  */
  69
  70 #include <sys/param.h>
  71 #include <sys/dir.h>
  72 #include <sys/proc.h>
  73 #include <sys/systm.h>
  74 #include <sys/vm.h>
  75 #include <sys/uio_internal.h>
  76 #include <sys/malloc.h>
  77
  78 #include <vm/pmap.h>
  79 #include <vm/vm_map.h>
  80 #include <vm/vm_kern.h>
  81 #include <mach/vm_param.h>
  82
  83 #include <ppc/Diagnostics.h>
  84 #include <ppc/mappings.h>
  85
  86 static caddr_t devzerobuf;
  87
  88 extern pmap_t kernel_pmap;
  89 extern boolean_t kernacc(off_t, size_t );
  90
  91 int mmread(dev_t dev, struct uio *uio);
  92 int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw);
  93 int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
  94 int mmwrite(dev_t dev, struct uio *uio);
  95
  96 int
  97 mmread(dev, uio)
  98         dev_t dev;
  99         struct uio *uio;
 100 {
 101
 102         return (mmrw(dev, uio, UIO_READ));
 103 }
 104
 105 int
 106 mmwrite(dev, uio)
 107         dev_t dev;
 108         struct uio *uio;
 109 {
 110
 111         return (mmrw(dev, uio, UIO_WRITE));
 112 }
 113
 114 int
 115 mmioctl(__unused dev_t dev, u_long cmd, __unused caddr_t data,
 116                 __unused int flag, __unused struct proc *p)
 117 {
 118         switch (cmd) {
 119         case FIONBIO:
 120         case FIOASYNC:
 121                 /* OK to do nothing: we always return immediately */
 122                 break;
 123         default:
 124                 return ENODEV;
 125         }
 126
 127         return (0);
 128 }
 129
 130 int
 131 mmrw(dev, uio, rw)
 132         dev_t dev;
 133         struct uio *uio;
 134         enum uio_rw rw;
 135 {
 136         register int o;
 137 #if LP64KERN
 138         register uint64_t c;
 139 #else
 140         register uint c;
 141 #endif
 142         addr64_t vll;
 143         int error = 0;
 144         vm_offset_t     where;
 145
 146         while (uio_resid(uio) > 0 && error == 0) {
 147                 if (uio_iov_len(uio) == 0) {
 148                         uio_next_iov(uio);
 149                         uio->uio_iovcnt--;
 150                         if (uio->uio_iovcnt < 0)
 151                                 panic("mmrw");
 152                         continue;
 153                 }
 154                 switch (minor(dev)) {
 155
 156 /* minor device 0 is physical memory */
 157                 case 0:
 158                         vll = trunc_page_64(uio->uio_offset);
 159                         if(((vll >> 31) == 1) || vll >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : max_mem))
 160                                 goto fault;
 161
 162                         if(dgWork.dgFlags & enaDiagDM) {                        /* Can we really get all memory? */
 163                                 if (kmem_alloc_pageable(kernel_map, &where, PAGE_SIZE) != KERN_SUCCESS) {
 164                                         goto fault;
 165                                 }
 166                                 else {
 167                                         addr64_t collad;
 168
 169                                         collad = mapping_make(kernel_pmap, (addr64_t)where, (ppnum_t)(vll >> 12), 0, 1, VM_PROT_READ);  /* Map it in for the moment */
 170                                         if(collad) {                                            /* See if it failed (shouldn't happen)  */
 171                                                 kmem_free(kernel_map, where, PAGE_SIZE);        /* Toss the page */
 172                                                 goto fault;                                             /* Kill the transfer */
 173                                         }
 174                                 }
 175                         }
 176                         else {
 177                                 if (kmem_alloc(kernel_map, &where, 4096)
 178                                         != KERN_SUCCESS) {
 179                                         goto fault;
 180                                 }
 181                         }
 182                         o = uio->uio_offset - vll;
 183                         // LP64todo - fix this!
 184                         c = min(PAGE_SIZE - o, uio_iov_len(uio));
 185                         error = uiomove((caddr_t)(where + o), c, uio);
 186
 187                         if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, (addr64_t)where);      /* Unmap it */
 188                         kmem_free(kernel_map, where, PAGE_SIZE);
 189                         continue;
 190
 191                 /* minor device 1 is kernel memory */
 192                 case 1:
 193                         /* Do some sanity checking */
 194                         if (((addr64_t)uio->uio_offset > vm_last_addr) ||
 195                                 ((addr64_t)uio->uio_offset < VM_MIN_KERNEL_ADDRESS))
 196                                 goto fault;
 197                         c = uio_iov_len(uio);
 198                         if (!kernacc(uio->uio_offset, c))
 199                                 goto fault;
 200                         error = uiomove64(uio->uio_offset, c, uio);
 201                         continue;
 202
 203                 /* minor device 2 is EOF/RATHOLE */
 204                 case 2:
 205                         if (rw == UIO_READ)
 206                                 return (0);
 207                         c = uio_iov_len(uio);
 208                         break;
 209                 /* minor device 3 is ZERO/RATHOLE */
 210                 case 3:
 211                         if(devzerobuf == NULL) {
 212                                 MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
 213                                 bzero(devzerobuf, PAGE_SIZE);
 214                         }
 215                         if(uio->uio_rw == UIO_WRITE) {
 216                                 c = uio_iov_len(uio);
 217                                 break;
 218                         }
 219                         // LP64todo - fix this!
 220                         c = min(uio_iov_len(uio), PAGE_SIZE);
 221                         error = uiomove(devzerobuf, c, uio);
 222                         continue;
 223                 default:
 224                         goto fault;
 225                         break;
 226                 }
 227
 228                 if (error)
 229                         break;
 230                 uio_iov_base_add(uio, c);
 231                 uio->uio_offset += c;
 232 #if LP64KERN
 233                 uio_setresid(uio, (uio_resid(uio) - c));
 234                 uio_iov_len_add(uio, -((int64_t)c));
 235 #else
 236                 uio_setresid(uio, (uio_resid(uio) - c));
 237                 uio_iov_len_add(uio, -((int)c));
 238 #endif
 239         }
 240         return (error);
 241 fault:
 242         return (EFAULT);
 243 }
 244