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  1. /*
  2.  * Copyright (C) 2001-2004 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 <arch.h>
  30. #include <arch/cp0.h>
  31. #include <arch/exception.h>
  32. #include <arch/asm/regname.h>
  33. #include <arch/asm.h>
  34. #include <mm/vm.h>
  35. #include <userspace.h>
  36.  
  37. void arch_pre_mm_init(void)
  38. {
  39.     /*
  40.      * Switch to BEV normal level so that exception vectors point to the kernel.
  41.      * Clear the error level.
  42.      */
  43.     cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit));
  44.  
  45.     /*
  46.      * Unmask hardware clock interrupt.
  47.      */
  48.     cp0_status_write(cp0_status_read() | (1<<cp0_status_im7_shift));
  49.  
  50.     /*
  51.      * Start hardware clock.
  52.      */
  53.     cp0_compare_write(cp0_compare_value);
  54.     cp0_count_write(0);
  55. }
  56.  
  57. void arch_post_mm_init(void)
  58. {
  59. }
  60.  
  61. void arch_late_init(void)
  62. {
  63. }
  64.  
  65. void userspace(void)
  66. {
  67.     /* EXL=1, UM=1, IE=1 */
  68.     cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
  69.                           cp0_status_um_bit |
  70.                           cp0_status_ie_enabled_bit));
  71.    
  72.     cp0_epc_write(UTEXT_ADDRESS);
  73.     userspace_asm(USTACK_ADDRESS+PAGE_SIZE);
  74.     while (1)
  75.         ;
  76. }
  77.  
  78. /* Stack pointer saved when entering user mode */
  79. /* TODO: How do we do it on SMP system???? */
  80. __address supervisor_sp;
  81.  
  82. void before_thread_runs_arch(void)
  83. {
  84.     supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  85. }
  86.  
  87.  
  88.