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  1. /*
  2.  * Copyright (C) 2003-2004 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. #include <arch/console.h>
  37. #include <memstr.h>
  38.  
  39. /* Size of the code jumping to the exception handler code
  40.  * - J+NOP
  41.  */
  42. #define EXCEPTION_JUMP_SIZE    8
  43.  
  44. #define TLB_EXC ((char *) 0x80000000)
  45. #define NORM_EXC ((char *) 0x80000180)
  46. #define CACHE_EXC ((char *) 0x80000100)
  47.  
  48. #include <arch/debug.h>
  49.  
  50. void arch_pre_mm_init(void)
  51. {
  52.     /* Copy the exception vectors to the right places */
  53.     memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);
  54.     memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);
  55.     memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);
  56.  
  57.  
  58.     /*
  59.      * Switch to BEV normal level so that exception vectors point to the kernel.
  60.      * Clear the error level.
  61.      */
  62.     cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit));
  63.  
  64.     /*
  65.      * Unmask hardware clock interrupt.
  66.      */
  67.     cp0_status_write(cp0_status_read() | (1<<cp0_status_im7_shift));
  68.  
  69.     /*
  70.      * Start hardware clock.
  71.      */
  72.     cp0_compare_write(cp0_compare_value + cp0_count_read());
  73.  
  74.     console_init();
  75. }
  76.  
  77. void arch_post_mm_init(void)
  78. {
  79. }
  80.  
  81. void arch_late_init(void)
  82. {
  83. }
  84.  
  85. void userspace(void)
  86. {
  87.     /* EXL=1, UM=1, IE=1 */
  88.     cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
  89.                           cp0_status_um_bit |
  90.                           cp0_status_ie_enabled_bit));
  91.    
  92.     cp0_epc_write(UTEXT_ADDRESS);
  93.     userspace_asm(USTACK_ADDRESS+PAGE_SIZE);
  94.     while (1)
  95.         ;
  96. }
  97.  
  98. /* Stack pointer saved when entering user mode */
  99. /* TODO: How do we do it on SMP system???? */
  100. __address supervisor_sp;
  101.  
  102. void before_thread_runs_arch(void)
  103. {
  104.     supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  105. }
  106.  
  107.  
  108.