/*
* Copyright (C) 2005 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <arch/trap/trap.h>
#include <arch/trap/trap_table.h>
#include <arch/trap/regwin.h>
#include <arch/trap/exception.h>
#include <arch/trap/interrupt.h>
#include <arch/trap/mmu.h>
#include <arch/asm.h>
#include <memstr.h>
#include <debug.h>
#include <arch/types.h>
#include <typedefs.h>
#include <arch/drivers/tick.h>
/** Initialize trap table. */
void trap_init(void)
{
/*
* Save kernel provided trap handlers.
*/
memcpy((void *) trap_table_save
, (void *) trap_table
, TRAP_TABLE_SIZE
);
/*
* Copy OFW's trap table into kernel.
*/
memcpy((void *) trap_table
, (void *) tba_read
(), TRAP_TABLE_SIZE
);
/*
* Install kernel-provided handlers.
*/
trap_install_handler(TT_INSTRUCTION_ACCESS_EXCEPTION, TRAP_TABLE_ENTRY_SIZE, false);
trap_install_handler(TT_CLEAN_WINDOW, CLEAN_WINDOW_HANDLER_SIZE, false);
trap_install_handler(TT_MEM_ADDRESS_NOT_ALIGNED, TRAP_TABLE_ENTRY_SIZE, false);
trap_install_handler(TT_SPILL_0_NORMAL, SPILL_HANDLER_SIZE, false);
trap_install_handler(TT_FILL_0_NORMAL, FILL_HANDLER_SIZE, false);
trap_install_handler(TT_INSTRUCTION_ACCESS_EXCEPTION, TRAP_TABLE_ENTRY_SIZE, true);
trap_install_handler(TT_CLEAN_WINDOW, CLEAN_WINDOW_HANDLER_SIZE, true);
trap_install_handler(TT_MEM_ADDRESS_NOT_ALIGNED, TRAP_TABLE_ENTRY_SIZE, true);
trap_install_handler(TT_SPILL_0_NORMAL, SPILL_HANDLER_SIZE, true);
trap_install_handler(TT_FILL_0_NORMAL, FILL_HANDLER_SIZE, true);
trap_install_handler(TT_INTERRUPT_LEVEL_1, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_2, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_3, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_4, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_5, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_6, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_7, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_8, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_9, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_10, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_11, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_12, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_13, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_14, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_LEVEL_15, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
trap_install_handler(TT_INTERRUPT_VECTOR_TRAP, INTERRUPT_VECTOR_TRAP_HANDLER_SIZE, false);
/*
* Kernel must become independent on Open Firmware calls before MMU handlers are enabled.
*/
/*
trap_install_handler(TT_FAST_INSTRUCTION_ACCESS_MMU_MISS, FAST_MMU_HANDLER_SIZE, false);
trap_install_handler(TT_FAST_DATA_ACCESS_MMU_MISS, FAST_MMU_HANDLER_SIZE, false);
trap_install_handler(TT_FAST_DATA_ACCESS_PROTECTION, FAST_MMU_HANDLER_SIZE, false);
trap_install_handler(TT_FAST_INSTRUCTION_ACCESS_MMU_MISS, FAST_MMU_HANDLER_SIZE, true);
trap_install_handler(TT_FAST_DATA_ACCESS_MMU_MISS, FAST_MMU_HANDLER_SIZE, true);
trap_install_handler(TT_FAST_DATA_ACCESS_PROTECTION, FAST_MMU_HANDLER_SIZE, true);
*/
}
/** Copy trap handler to active trap table.
*
* The handler is copied from trap_table_kernel to trap_handler.
*
* @param tt Trap type. An index that uniquelly identifies handler code.
* @param len Length of the handler in bytes. Must be multiple of TRAP_TABLE_ENTRY_SIZE (i.e. 32).
* @param tlnonz If false, tt is considered from the lower half of trap table. If true, the upper half is chosen.
*/
void trap_install_handler(index_t tt, size_t len, bool tlnonz)
{
count_t cnt;
int i;
ASSERT(tt < TRAP_TABLE_ENTRY_COUNT/2);
ASSERT(len % TRAP_TABLE_ENTRY_SIZE == 0);
if (tlnonz)
tt += TRAP_TABLE_ENTRY_COUNT/2;
cnt = len/TRAP_TABLE_ENTRY_SIZE;
for (i = tt; i < tt + cnt; i++) {
trap_table[i] = trap_table_save[i];
}
}