osfmk/kern/page_decrypt.c

   1 /*
   2  * Copyright (c) 2005-2006 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
  30 #include <kern/page_decrypt.h>
  31 #include <kern/task.h>
  32 #include <machine/commpage.h>
  33
  34 /*#include <sys/kernel.h> */
  35 extern int hz;                  /* system clock's frequency */
  36
  37 /* #include <sys/proc.h> */
  38 extern int      tsleep(void *chan, int pri, const char *wmesg, int timo);
  39
  40 /* #include <sys/param.h> */
  41 #define PZERO   22              /* No longer magic, shouldn't be here.  XXX */
  42
  43 static int _dsmos_wait_for_callback(const void*,void*);
  44
  45 static dsmos_page_transform_hook_t dsmos_hook = _dsmos_wait_for_callback;
  46
  47 int
  48 _dsmos_wait_for_callback(const void* from, void *to)
  49 {
  50 /*      printf("%s\n", __FUNCTION__); */
  51         while (dsmos_hook == NULL || dsmos_hook == _dsmos_wait_for_callback)
  52                 tsleep(&dsmos_hook, PZERO, "dsmos", hz / 10);
  53
  54         return (*dsmos_hook) (from, to);
  55 }
  56
  57 void
  58 dsmos_page_transform_hook(dsmos_page_transform_hook_t hook)
  59 {
  60 /*      printf("%s\n", __FUNCTION__); */
  61
  62         /* set the hook now - new callers will run with it */
  63         dsmos_hook = hook;
  64 }
  65
  66 int
  67 dsmos_page_transform(const void* from, void *to, __unused unsigned long long src_offset, __unused void *ops)
  68 {
  69 /*      printf("%s\n", __FUNCTION__); */
  70         if (dsmos_hook == NULL)
  71                 return KERN_FAILURE;
  72         return (*dsmos_hook) (from, to);
  73 }
  74
  75
  76 text_crypter_create_hook_t text_crypter_create=NULL;
  77 void text_crypter_create_hook_set(text_crypter_create_hook_t hook)
  78 {
  79         text_crypter_create=hook;
  80 };