osfmk/kern/page_decrypt.c

   1 /*
   2  * Copyright (c) 2005 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
  32 #include <kern/page_decrypt.h>
  33 #include <kern/task.h>
  34 #include <machine/commpage.h>
  35
  36 /*#include <sys/kernel.h> */
  37 extern int hz;                  /* system clock's frequency */
  38 extern void*   dsmos_blobs[];
  39 extern int     dsmos_blob_count;
  40
  41 /* #include <sys/proc.h> */
  42 extern int      tsleep(void *chan, int pri, const char *wmesg, int timo);
  43
  44 /* #include <sys/param.h> */
  45 #define PZERO   22              /* No longer magic, shouldn't be here.  XXX */
  46
  47 static int _dsmos_wait_for_callback(const void*,void*);
  48
  49 static dsmos_page_transform_hook_t dsmos_hook = _dsmos_wait_for_callback;
  50
  51 int
  52 _dsmos_wait_for_callback(const void* from, void *to)
  53 {
  54 /*      printf("%s\n", __FUNCTION__); */
  55         while (dsmos_hook == NULL)
  56                 tsleep(&dsmos_hook, PZERO, "dsmos", hz / 10);
  57
  58         return (*dsmos_hook) (from, to);
  59 }
  60
  61 void
  62 dsmos_page_transform_hook(dsmos_page_transform_hook_t hook,
  63                           void (*commpage_setup_dsmos_blob)(void**, int))
  64 {
  65 #ifdef i386
  66         /* finish initializing the commpage here */
  67         (*commpage_setup_dsmos_blob)(dsmos_blobs, dsmos_blob_count);
  68 #endif
  69
  70         /* set the hook now - new callers will run with it */
  71         dsmos_hook = hook;
  72 }
  73
  74 int
  75 dsmos_page_transform(const void* from, void* to)
  76 {
  77 /*      printf("%s\n", __FUNCTION__); */
  78         if (dsmos_hook == NULL)
  79                 return KERN_FAILURE;
  80         return (*dsmos_hook) (from, to);
  81 }
  82