| 1 | /*
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| 2 | * Copyright (C) 2005 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup sparc64
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <arch/drivers/tick.h>
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| 36 | #include <arch/interrupt.h>
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| 37 | #include <arch/asm.h>
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| 38 | #include <arch/register.h>
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| 39 | #include <typedefs.h>
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| 40 | #include <arch/cpu.h>
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| 41 | #include <arch/boot/boot.h>
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| 42 | #include <time/clock.h>
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| 43 | #include <arch.h>
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| 44 | #include <debug.h>
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| 45 |
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| 46 | #define TICK_RESTART_TIME 50 /* Worst case estimate. */
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| 47 |
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| 48 | /** Initialize tick interrupt. */
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| 49 | void tick_init(void)
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| 50 | {
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| 51 | tick_compare_reg_t compare;
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| 52 |
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| 53 | interrupt_register(14, "tick_int", tick_interrupt);
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| 54 | compare.int_dis = false;
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| 55 | compare.tick_cmpr = bootinfo.processor.clock_frequency/HZ;
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| 56 | tick_compare_write(compare.value);
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| 57 | tick_write(0);
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| 58 | }
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| 59 |
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| 60 | /** Process tick interrupt.
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| 61 | *
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| 62 | * @param n Interrupt Level, 14, (can be ignored)
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| 63 | * @param istate Interrupted state.
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| 64 | */
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| 65 | void tick_interrupt(int n, istate_t *istate)
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| 66 | {
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| 67 | softint_reg_t softint, clear;
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| 68 | uint64_t next, compare, start, stop;
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| 69 |
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| 70 | softint.value = softint_read();
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| 71 |
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| 72 | /*
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| 73 | * Make sure we are servicing interrupt_level_14
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| 74 | */
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| 75 | ASSERT(n == 14);
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| 76 |
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| 77 | /*
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| 78 | * Make sure we are servicing TICK_INT.
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| 79 | */
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| 80 | ASSERT(softint.tick_int);
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| 81 |
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| 82 | /*
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| 83 | * Clear tick interrupt.
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| 84 | */
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| 85 | clear.value = 0;
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| 86 | clear.tick_int = 1;
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| 87 | clear_softint_write(clear.value);
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| 88 |
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| 89 | /*
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| 90 | * Restart counter.
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| 91 | */
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| 92 | compare = CPU->arch.clock_frequency/HZ;
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| 93 | start = tick_read();
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| 94 | next = start - compare;
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| 95 | while (next >= compare - TICK_RESTART_TIME) {
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| 96 | next -= compare;
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| 97 | CPU->missed_clock_ticks++;
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| 98 | }
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| 99 | stop = tick_read();
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| 100 | tick_write(next + (stop - start));
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| 101 |
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| 102 | clock();
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| 103 | }
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| 104 |
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| 105 | /** @}
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| 106 | */
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