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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. #include <arch/interrupt.h>
  39.  
  40. /* Size of the code jumping to the exception handler code
  41.  * - J+NOP
  42.  */
  43. #define EXCEPTION_JUMP_SIZE    8
  44.  
  45. #define TLB_EXC ((char *) 0x80000000)
  46. #define NORM_EXC ((char *) 0x80000180)
  47. #define CACHE_EXC ((char *) 0x80000100)
  48.  
  49. #include <arch/debug.h>
  50.  
  51. #include <print.h>
  52. void arch_pre_mm_init(void)
  53. {
  54.     /* It is not assumed by default */
  55.     cpu_priority_high();
  56.  
  57.     /* Copy the exception vectors to the right places */
  58.     memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);
  59.     memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);
  60.     memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);
  61.  
  62.     /*
  63.      * Switch to BEV normal level so that exception vectors point to the kernel.
  64.      * Clear the error level.
  65.      */
  66.     cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit));
  67.  
  68.     /*
  69.      * Mask all interrupts
  70.      */
  71.     cp0_mask_all_int();
  72.     /*
  73.      * Unmask hardware clock interrupt.
  74.      */
  75.     cp0_unmask_int(TIMER_INTERRUPT);
  76.  
  77.     /*
  78.      * Start hardware clock.
  79.      */
  80.     cp0_compare_write(cp0_compare_value + cp0_count_read());
  81.  
  82.     console_init();
  83. }
  84.  
  85. void arch_post_mm_init(void)
  86. {
  87. }
  88.  
  89. void arch_late_init(void)
  90. {
  91. }
  92.  
  93. void userspace(void)
  94. {
  95.     /* EXL=1, UM=1, IE=1 */
  96.     cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
  97.                           cp0_status_um_bit |
  98.                           cp0_status_ie_enabled_bit));
  99.    
  100.     cp0_epc_write(UTEXT_ADDRESS);
  101.     userspace_asm(USTACK_ADDRESS+PAGE_SIZE);
  102.     while (1)
  103.         ;
  104. }
  105.  
  106. /* Stack pointer saved when entering user mode */
  107. /* TODO: How do we do it on SMP system???? */
  108. __address supervisor_sp;
  109.  
  110. void before_thread_runs_arch(void)
  111. {
  112.     supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  113. }
  114.  
  115.  
  116.