osfmk/kern/page_decrypt.c

   1 /*
   2  * Copyright (c) 2005 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
  24 #include <kern/page_decrypt.h>
  25 #include <kern/task.h>
  26 #include <machine/commpage.h>
  27
  28 /*#include <sys/kernel.h> */
  29 extern int hz;                  /* system clock's frequency */
  30 extern void*   dsmos_blobs[];
  31 extern int     dsmos_blob_count;
  32
  33 /* #include <sys/proc.h> */
  34 extern int      tsleep(void *chan, int pri, const char *wmesg, int timo);
  35
  36 /* #include <sys/param.h> */
  37 #define PZERO   22              /* No longer magic, shouldn't be here.  XXX */
  38
  39 static int _dsmos_wait_for_callback(const void*,void*);
  40
  41 static dsmos_page_transform_hook_t dsmos_hook = _dsmos_wait_for_callback;
  42
  43 int
  44 _dsmos_wait_for_callback(const void* from, void *to)
  45 {
  46 /*      printf("%s\n", __FUNCTION__); */
  47         while (dsmos_hook == NULL)
  48                 tsleep(&dsmos_hook, PZERO, "dsmos", hz / 10);
  49
  50         return (*dsmos_hook) (from, to);
  51 }
  52
  53 void
  54 dsmos_page_transform_hook(dsmos_page_transform_hook_t hook,
  55                           void (*commpage_setup_dsmos_blob)(void**, int))
  56 {
  57 #ifdef i386
  58         /* finish initializing the commpage here */
  59         (*commpage_setup_dsmos_blob)(dsmos_blobs, dsmos_blob_count);
  60 #endif
  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)
  68 {
  69 /*      printf("%s\n", __FUNCTION__); */
  70         if (dsmos_hook == NULL)
  71                 return KERN_FAILURE;
  72         return (*dsmos_hook) (from, to);
  73 }
  74