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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 <arch/trap/trap.h>
  30. #include <arch/trap/trap_table.h>
  31. #include <arch/trap/regwin.h>
  32. #include <arch/trap/exception.h>
  33. #include <arch/trap/interrupt.h>
  34. #include <arch/trap/mmu.h>
  35. #include <arch/asm.h>
  36. #include <memstr.h>
  37. #include <debug.h>
  38. #include <arch/types.h>
  39. #include <typedefs.h>
  40. #include <arch/drivers/tick.h>
  41.  
  42. /** Initialize trap table. */
  43. void trap_init(void)
  44. {
  45.     /*
  46.      * Save kernel provided trap handlers.
  47.      */
  48.     memcpy((void *) trap_table_save, (void *) trap_table, TRAP_TABLE_SIZE);
  49.  
  50.     /*
  51.      * Copy OFW's trap table into kernel.
  52.      */
  53.     memcpy((void *) trap_table, (void *) tba_read(), TRAP_TABLE_SIZE);
  54.    
  55.     /*
  56.      * Install kernel-provided handlers.
  57.      */
  58.     trap_install_handler(TT_INSTRUCTION_ACCESS_EXCEPTION, TRAP_TABLE_ENTRY_SIZE, false);
  59.     trap_install_handler(TT_CLEAN_WINDOW, CLEAN_WINDOW_HANDLER_SIZE, false);
  60.     trap_install_handler(TT_MEM_ADDRESS_NOT_ALIGNED, TRAP_TABLE_ENTRY_SIZE, false);
  61.     trap_install_handler(TT_SPILL_0_NORMAL, SPILL_HANDLER_SIZE, false);
  62.     trap_install_handler(TT_FILL_0_NORMAL, FILL_HANDLER_SIZE, false);
  63.     trap_install_handler(TT_INSTRUCTION_ACCESS_EXCEPTION, TRAP_TABLE_ENTRY_SIZE, true);
  64.     trap_install_handler(TT_CLEAN_WINDOW, CLEAN_WINDOW_HANDLER_SIZE, true);
  65.     trap_install_handler(TT_MEM_ADDRESS_NOT_ALIGNED, TRAP_TABLE_ENTRY_SIZE, true);
  66.     trap_install_handler(TT_SPILL_0_NORMAL, SPILL_HANDLER_SIZE, true);
  67.     trap_install_handler(TT_FILL_0_NORMAL, FILL_HANDLER_SIZE, true);
  68.     trap_install_handler(TT_INTERRUPT_LEVEL_1, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  69.     trap_install_handler(TT_INTERRUPT_LEVEL_2, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  70.     trap_install_handler(TT_INTERRUPT_LEVEL_3, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  71.     trap_install_handler(TT_INTERRUPT_LEVEL_4, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  72.     trap_install_handler(TT_INTERRUPT_LEVEL_5, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  73.     trap_install_handler(TT_INTERRUPT_LEVEL_6, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  74.     trap_install_handler(TT_INTERRUPT_LEVEL_7, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  75.     trap_install_handler(TT_INTERRUPT_LEVEL_8, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  76.     trap_install_handler(TT_INTERRUPT_LEVEL_9, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  77.     trap_install_handler(TT_INTERRUPT_LEVEL_10, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  78.     trap_install_handler(TT_INTERRUPT_LEVEL_11, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  79.     trap_install_handler(TT_INTERRUPT_LEVEL_12, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  80.     trap_install_handler(TT_INTERRUPT_LEVEL_13, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  81.     trap_install_handler(TT_INTERRUPT_LEVEL_14, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  82.     trap_install_handler(TT_INTERRUPT_LEVEL_15, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
  83.     trap_install_handler(TT_INTERRUPT_VECTOR_TRAP, INTERRUPT_VECTOR_TRAP_HANDLER_SIZE, false);
  84.  
  85.     /*
  86.      * Kernel must become independent on Open Firmware calls before MMU handlers are enabled.
  87.      */
  88. /*
  89.     trap_install_handler(TT_FAST_INSTRUCTION_ACCESS_MMU_MISS, FAST_MMU_HANDLER_SIZE, false);
  90.     trap_install_handler(TT_FAST_DATA_ACCESS_MMU_MISS, FAST_MMU_HANDLER_SIZE, false);
  91.     trap_install_handler(TT_FAST_DATA_ACCESS_PROTECTION, FAST_MMU_HANDLER_SIZE, false);
  92.     trap_install_handler(TT_FAST_INSTRUCTION_ACCESS_MMU_MISS, FAST_MMU_HANDLER_SIZE, true);
  93.     trap_install_handler(TT_FAST_DATA_ACCESS_MMU_MISS, FAST_MMU_HANDLER_SIZE, true);
  94.     trap_install_handler(TT_FAST_DATA_ACCESS_PROTECTION, FAST_MMU_HANDLER_SIZE, true);
  95. */
  96.  
  97. }
  98.  
  99. /** Copy trap handler to active trap table.
  100.  *
  101.  * The handler is copied from trap_table_kernel to trap_handler.
  102.  *
  103.  * @param tt Trap type. An index that uniquelly identifies handler code.
  104.  * @param len Length of the handler in bytes. Must be multiple of TRAP_TABLE_ENTRY_SIZE (i.e. 32).
  105.  * @param tlnonz If false, tt is considered from the lower half of trap table. If true, the upper half is chosen.
  106.  */
  107. void trap_install_handler(index_t tt, size_t len, bool tlnonz)
  108. {
  109.     count_t cnt;
  110.     int i;
  111.  
  112.     ASSERT(tt < TRAP_TABLE_ENTRY_COUNT/2);
  113.     ASSERT(len % TRAP_TABLE_ENTRY_SIZE == 0);
  114.  
  115.     if (tlnonz)
  116.         tt += TRAP_TABLE_ENTRY_COUNT/2;
  117.  
  118.     cnt = len/TRAP_TABLE_ENTRY_SIZE;
  119.    
  120.     for (i = tt; i < tt + cnt; i++) {
  121.         trap_table[i] = trap_table_save[i];
  122.     }  
  123. }
  124.