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/*

 * 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];

    }  

}