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619 jermar 1 
/*
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 * Copyright (C) 2005 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <arch/trap/trap.h>
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#include <arch/trap/trap_table.h>
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#include <arch/trap/regwin.h>
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#include <arch/trap/exception.h>
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#include <arch/trap/interrupt.h>
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#include <arch/asm.h>
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#include <memstr.h>
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#include <debug.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <arch/drivers/tick.h>
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/** Initialize trap table. */
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void trap_init(void)
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{
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    /*
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     * Save kernel provided trap handlers.
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     */
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    memcpy((void *) trap_table_save, (void *) trap_table, TRAP_TABLE_SIZE);
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    /*
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     * Copy OFW's trap table into kernel.
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     */
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    memcpy((void *) trap_table, (void *) tba_read(), TRAP_TABLE_SIZE);
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    /*
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     * Install kernel-provided handlers.
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     */
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    trap_install_handler(TT_INSTRUCTION_ACCESS_EXCEPTION, TRAP_TABLE_ENTRY_SIZE, false);
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    trap_install_handler(TT_CLEAN_WINDOW, CLEAN_WINDOW_HANDLER_SIZE, false);
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    trap_install_handler(TT_MEM_ADDRESS_NOT_ALIGNED, TRAP_TABLE_ENTRY_SIZE, false);
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    trap_install_handler(TT_SPILL_0_NORMAL, SPILL_HANDLER_SIZE, false);
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    trap_install_handler(TT_FILL_0_NORMAL, FILL_HANDLER_SIZE, false);
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    trap_install_handler(TT_INSTRUCTION_ACCESS_EXCEPTION, TRAP_TABLE_ENTRY_SIZE, true);
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    trap_install_handler(TT_CLEAN_WINDOW, CLEAN_WINDOW_HANDLER_SIZE, true);
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    trap_install_handler(TT_MEM_ADDRESS_NOT_ALIGNED, TRAP_TABLE_ENTRY_SIZE, true);
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    trap_install_handler(TT_SPILL_0_NORMAL, SPILL_HANDLER_SIZE, true);
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    trap_install_handler(TT_FILL_0_NORMAL, FILL_HANDLER_SIZE, true);
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    trap_install_handler(TT_INTERRUPT_LEVEL_1, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_2, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_3, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_4, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_5, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_6, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_7, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_8, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_9, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_10, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_11, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_12, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_13, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_14, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_LEVEL_15, INTERRUPT_LEVEL_N_HANDLER_SIZE, false);
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    trap_install_handler(TT_INTERRUPT_VECTOR_TRAP, INTERRUPT_VECTOR_TRAP_HANDLER_SIZE, false);
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}
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/** Copy trap handler to active trap table.
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 *
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 * The handler is copied from trap_table_kernel to trap_handler.
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 *
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 * @param tt Trap type. An index that uniquelly identifies handler code.
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 * @param len Length of the handler in bytes. Must be multiple of TRAP_TABLE_ENTRY_SIZE (i.e. 32).
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 * @param tlnonz If false, tt is considered from the lower half of trap table. If true, the upper half is chosen.
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 */
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void trap_install_handler(index_t tt, size_t len, bool tlnonz)
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{
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    count_t cnt;
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    int i;
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    ASSERT(tt < TRAP_TABLE_ENTRY_COUNT/2);
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    ASSERT(len % TRAP_TABLE_ENTRY_SIZE == 0);
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    if (tlnonz)
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        tt += TRAP_TABLE_ENTRY_COUNT/2;
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    cnt = len/TRAP_TABLE_ENTRY_SIZE;
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    for (i = tt; i < tt + cnt; i++) {
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        trap_table[i] = trap_table_save[i];
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    }  
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}