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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <userspace.h>
  30. #include <arch/pm.h>
  31. #include <arch/types.h>
  32. #include <arch.h>
  33. #include <proc/thread.h>
  34. #include <mm/vm.h>
  35.  
  36.  
  37. /** Enter userspace
  38.  *
  39.  * Change CPU protection level to 3, enter userspace.
  40.  *
  41.  */
  42. void userspace(void)
  43. {
  44.     pri_t pri;
  45.    
  46.     pri = cpu_priority_high();
  47.  
  48.     __asm__ volatile (""
  49.     // CLNT
  50.         "pushfl;"
  51.         "pop %%eax;"
  52.         "and $0xFFFFBFFF;"
  53.         "push %%eax;"
  54.         "popfl;"
  55.  
  56.         "pushl %0\n"
  57.         "pushl %1\n"
  58.         "pushl %2\n"
  59.         "pushl %3\n"
  60.         "pushl %4\n"
  61.         "iret"
  62.         : : "i" (selector(UDATA_DES) | PL_USER), "i" (USTACK_ADDRESS+(THREAD_STACK_SIZE-1)), "r" (pri), "i" (selector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS));
  63.    
  64.     /* Unreachable */
  65.     for(;;);
  66. }
  67.