00001 /* 00002 * Copyright (C) 2005 Jakub Jermar 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 00009 * - Redistributions of source code must retain the above copyright 00010 * notice, this list of conditions and the following disclaimer. 00011 * - Redistributions in binary form must reproduce the above copyright 00012 * notice, this list of conditions and the following disclaimer in the 00013 * documentation and/or other materials provided with the distribution. 00014 * - The name of the author may not be used to endorse or promote products 00015 * derived from this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 00018 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00019 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 00020 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 00021 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 00022 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00023 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00024 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00025 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 00026 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00027 */ 00028 00035 #include <arch/drivers/tick.h> 00036 #include <arch/interrupt.h> 00037 #include <arch/asm.h> 00038 #include <arch/register.h> 00039 #include <debug.h> 00040 #include <time/clock.h> 00041 #include <typedefs.h> 00042 00044 void tick_init(void) 00045 { 00046 tick_compare_reg_t compare; 00047 00048 interrupt_register(14, "tick_int", tick_interrupt); 00049 compare.int_dis = false; 00050 compare.tick_cmpr = TICK_DELTA; 00051 tick_compare_write(compare.value); 00052 tick_write(0); 00053 } 00054 00060 void tick_interrupt(int n, istate_t *istate) 00061 { 00062 softint_reg_t softint, clear; 00063 00064 softint.value = softint_read(); 00065 00066 /* 00067 * Make sure we are servicing interrupt_level_14 00068 */ 00069 ASSERT(n == 14); 00070 00071 /* 00072 * Make sure we are servicing TICK_INT. 00073 */ 00074 ASSERT(softint.tick_int); 00075 00076 /* 00077 * Clear tick interrupt. 00078 */ 00079 clear.value = 0; 00080 clear.tick_int = 1; 00081 clear_softint_write(clear.value); 00082 00083 /* 00084 * Restart counter. 00085 */ 00086 tick_write(0); 00087 00088 clock(); 00089 } 00090