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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/asm.h>
  33. #include <memstr.h>
  34. #include <debug.h>
  35. #include <arch/types.h>
  36. #include <typedefs.h>
  37.  
  38. /** Initialize trap table. */
  39. void trap_init(void)
  40. {
  41.     /*
  42.      * Save kernel provided trap handlers.
  43.      */
  44.     memcpy((void *) trap_table_save, (void *) trap_table, TRAP_TABLE_SIZE);
  45.  
  46.     /*
  47.      * Copy OFW's trap table into kernel.
  48.      */
  49.     memcpy((void *) trap_table, (void *) tba_read(), TRAP_TABLE_SIZE);
  50.    
  51.     /*
  52.      * Install kernel-provided handlers.
  53.      */
  54.     trap_install_handler(TT_CLEAN_WINDOW, CLEAN_WINDOW_HANDLER_SIZE, false);
  55.     trap_install_handler(TT_SPILL_0_NORMAL, SPILL_HANDLER_SIZE, false);
  56.     trap_install_handler(TT_FILL_0_NORMAL, FILL_HANDLER_SIZE, false);
  57. }
  58.  
  59. /** Copy trap handler to active trap table.
  60.  *
  61.  * The handler is copied from trap_table_kernel to trap_handler.
  62.  *
  63.  * @param tt Trap type. An index that uniquelly identifies handler code.
  64.  * @param len Length of the handler in bytes. Must be multiple of TRAP_TABLE_ENTRY_SIZE (i.e. 32).
  65.  * @param tlnonz If false, tt is considered from the lower half of trap table. If true, the upper half is chosen.
  66.  */
  67. void trap_install_handler(index_t tt, size_t len, bool tlnonz)
  68. {
  69.     count_t cnt;
  70.     int i;
  71.  
  72.     ASSERT(tt < TRAP_TABLE_ENTRY_COUNT/2);
  73.     ASSERT(len % TRAP_TABLE_ENTRY_SIZE == 0);
  74.  
  75.     if (tlnonz)
  76.         tt += TRAP_TABLE_ENTRY_COUNT/2;
  77.  
  78.     cnt = len/TRAP_TABLE_ENTRY_SIZE;
  79.    
  80.     for (i = tt; i < tt + cnt; i++) {
  81.         trap_table[i] = trap_table_save[i];
  82.     }  
  83. }
  84.