mem.c

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    1 /*-
    2  * Copyright (c) 1988 University of Utah.
    3  * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * the Systems Programming Group of the University of Utah Computer
    8  * Science Department, and code derived from software contributed to
    9  * Berkeley by William Jolitz.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      from: Utah $Hdr: mem.c 1.13 89/10/08$
   36  *      from: @(#)mem.c 7.2 (Berkeley) 5/9/91
   37  *      from: FreeBSD: src/sys/i386/i386/mem.c,v 1.94 2001/09/26
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   42 
   43 /*
   44  * Memory special file
   45  *
   46  * NOTE: other architectures support mmap()'ing the mem and kmem devices; this
   47  * might cause illegal aliases to be created for the locked kernel page(s), so
   48  * it is not implemented.
   49  */
   50 #include "opt_global.h"
   51 
   52 #include <sys/param.h>
   53 #include <sys/conf.h>
   54 #include <sys/fcntl.h>
   55 #include <sys/kernel.h>
   56 #include <sys/lock.h>
   57 #include <sys/malloc.h>
   58 #include <sys/memrange.h>
   59 #include <sys/module.h>
   60 #include <sys/mutex.h>
   61 #include <sys/proc.h>
   62 #include <sys/signalvar.h>
   63 #include <sys/systm.h>
   64 #include <sys/uio.h>
   65 
   66 #include <vm/vm.h>
   67 #include <vm/vm_param.h>
   68 #include <vm/vm_page.h>
   69 #include <vm/vm_kern.h>
   70 #include <vm/pmap.h>
   71 #include <vm/vm_extern.h>
   72 
   73 #ifndef SUN4V
   74 #include <machine/cache.h>
   75 #endif
   76 #include <machine/md_var.h>
   77 #include <machine/pmap.h>
   78 #include <machine/tlb.h>
   79 
   80 #include <machine/memdev.h>
   81 
   82 struct mem_range_softc mem_range_softc;
   83 
   84 /* ARGSUSED */
   85 int
   86 memrw(struct cdev *dev, struct uio *uio, int flags)
   87 {
   88         struct iovec *iov;
   89         vm_offset_t eva;
   90         vm_offset_t off;
   91         vm_offset_t ova;
   92         vm_offset_t va;
   93         vm_prot_t prot;
   94         vm_paddr_t pa;
   95         vm_size_t cnt;
   96         vm_page_t m;
   97         int error;
   98         int i;
   99 
  100         cnt = 0;
  101         error = 0;
  102         ova = 0;
  103 
  104         GIANT_REQUIRED;
  105 
  106         while (uio->uio_resid > 0 && error == 0) {
  107                 iov = uio->uio_iov;
  108                 if (iov->iov_len == 0) {
  109                         uio->uio_iov++;
  110                         uio->uio_iovcnt--;
  111                         if (uio->uio_iovcnt < 0)
  112                                 panic("memrw");
  113                         continue;
  114                 }
  115                 if (minor(dev) == CDEV_MINOR_MEM) {
  116                         pa = uio->uio_offset & ~PAGE_MASK;
  117                         if (!is_physical_memory(pa)) {
  118                                 error = EFAULT;
  119                                 break;
  120                         }
  121 
  122                         off = uio->uio_offset & PAGE_MASK;
  123                         cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
  124                             PAGE_MASK);
  125                         cnt = ulmin(cnt, PAGE_SIZE - off);
  126                         cnt = ulmin(cnt, iov->iov_len);
  127 
  128                         m = NULL;
  129                         for (i = 0; phys_avail[i] != 0; i += 2) {
  130                                 if (pa >= phys_avail[i] &&
  131                                     pa < phys_avail[i + 1]) {
  132                                         m = PHYS_TO_VM_PAGE(pa);
  133                                         break;
  134                                 }
  135                         }
  136 
  137                         if (m != NULL) {
  138 #ifndef SUN4V
  139                                 if (ova == 0)
  140                                         ova = kmem_alloc_wait(kernel_map,
  141                                             PAGE_SIZE * DCACHE_COLORS);
  142                                 if (m->md.color != -1)
  143                                         va = ova + m->md.color * PAGE_SIZE;
  144                                 else
  145                                         va = ova;
  146 #else
  147                                 if (ova == 0)
  148                                         ova = kmem_alloc_wait(kernel_map,
  149                                             PAGE_SIZE);
  150                                 va = ova;
  151 #endif
  152                                 pmap_qenter(va, &m, 1);
  153                                 error = uiomove((void *)(va + off), cnt,
  154                                     uio);
  155                                 pmap_qremove(va, 1);
  156                         } else {
  157                                 va = TLB_PHYS_TO_DIRECT(pa);
  158                                 error = uiomove((void *)(va + off), cnt,
  159                                     uio);
  160                         }
  161                         break;
  162                 }
  163                 else if (minor(dev) == CDEV_MINOR_KMEM) {
  164                         va = trunc_page(uio->uio_offset);
  165                         eva = round_page(uio->uio_offset + iov->iov_len);
  166 
  167                         /*
  168                          * Make sure that all of the pages are currently
  169                          * resident so we don't create any zero fill pages.
  170                          */
  171                         for (; va < eva; va += PAGE_SIZE)
  172                                 if (pmap_kextract(va) == 0)
  173                                         return (EFAULT);
  174 
  175                         prot = (uio->uio_rw == UIO_READ) ? VM_PROT_READ :
  176                             VM_PROT_WRITE;
  177                         va = uio->uio_offset;
  178                         if (va < VM_MIN_DIRECT_ADDRESS &&
  179                             kernacc((void *)va, iov->iov_len, prot) == FALSE)
  180                                 return (EFAULT);
  181 
  182                         error = uiomove((void *)va, iov->iov_len, uio);
  183                         break;
  184                 }
  185                 /* else panic! */
  186         }
  187         if (ova != 0)
  188 #ifndef SUN4V
  189                 kmem_free_wakeup(kernel_map, ova, PAGE_SIZE * DCACHE_COLORS);
  190 #else
  191                 kmem_free_wakeup(kernel_map, ova, PAGE_SIZE);
  192 #endif
  193         return (error);
  194 }
  195 
  196 void
  197 dev_mem_md_init(void)
  198 {
  199 }

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FreeBSD/Linux Kernel Cross Reference sys/sparc64/sparc64/mem.c

FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/mem.c