osfmk/i386/hibernate_restore.c

   1 /*
   2  * Copyright (c) 2008 Apple 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 #include <i386/pmap.h>
  29 #include <i386/proc_reg.h>
  30 #include <IOKit/IOHibernatePrivate.h>
  31
  32 extern pd_entry_t BootstrapPTD[2048];
  33
  34 #define TWO_MEG_MASK 0xFFFFFFFFFFE00000ULL
  35
  36 #define DST_INDEX 2047UL
  37
  38 static char *dstPtr = (char *)(DST_INDEX << PDSHIFT);
  39
  40 // src is virtually mapped, not page aligned,
  41 // dst is a physical 4k page aligned ptr, len is one 4K page
  42 // src & dst will not overlap
  43
  44 void
  45 hibernate_restore_phys_page(uint64_t src, uint64_t dst, uint32_t len, uint32_t procFlags)
  46 {
  47         (void)procFlags;
  48         uint64_t * d;
  49         uint64_t * s;
  50         uint32_t idx;
  51
  52         if (src == 0)
  53                 return;
  54
  55         if (dst < (uint64_t) (uintptr_t)dstPtr)
  56         {
  57                 d = (uint64_t *) (uintptr_t)dst;
  58         }
  59         else
  60         {
  61                 /* Outside 1-1 4G map so set up the mappings for the dest page using 2MB pages */
  62                 BootstrapPTD[DST_INDEX] = (dst & TWO_MEG_MASK) | INTEL_PTE_PS | INTEL_PTE_VALID | INTEL_PTE_WRITE | INTEL_PTE_WRITE;
  63
  64                 /* Invalidate the page tables for this */
  65                 invlpg((uintptr_t) dstPtr);
  66
  67                 /* Mask off the offset from the 2MB window */
  68                 dst &= ~TWO_MEG_MASK;
  69                 d = (uint64_t *) (dstPtr + dst);
  70         }
  71         s = (uint64_t *) (uintptr_t)src;
  72         for (idx = 0; idx < (len / (uint32_t)sizeof(uint64_t)); idx++)
  73                 d[idx] = s[idx];
  74 }