Rev 1702 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 435 | jermar | 1 | /* |
| 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 | |||
| 1702 | cejka | 29 | /** @addtogroup ia64 |
| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 435 | jermar | 35 | /** Interval Timer driver. */ |
| 36 | |||
| 37 | #include <arch/drivers/it.h> |
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| 577 | palkovsky | 38 | #include <arch/ski/ski.h> |
| 435 | jermar | 39 | #include <arch/interrupt.h> |
| 40 | #include <arch/register.h> |
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| 41 | #include <arch/asm.h> |
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| 42 | #include <arch/barrier.h> |
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| 43 | #include <time/clock.h> |
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| 1482 | vana | 44 | #include <arch.h> |
| 435 | jermar | 45 | |
| 519 | vana | 46 | |
| 1482 | vana | 47 | #define IT_SERVICE_CLOCKS 64 |
| 48 | |||
| 435 | jermar | 49 | /** Initialize Interval Timer. */ |
| 50 | void it_init(void) |
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| 51 | { |
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| 52 | cr_itv_t itv; |
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| 53 | |||
| 54 | /* initialize Interval Timer external interrupt vector */ |
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| 55 | itv.value = itv_read(); |
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| 56 | itv.vector = INTERRUPT_TIMER; |
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| 57 | itv.m = 0; |
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| 58 | itv_write(itv.value); |
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| 59 | |||
| 60 | /* set Interval Timer Counter to zero */ |
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| 61 | itc_write(0); |
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| 62 | |||
| 63 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
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| 64 | itm_write(IT_DELTA); |
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| 456 | jermar | 65 | |
| 66 | /* propagate changes */ |
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| 435 | jermar | 67 | srlz_d(); |
| 68 | } |
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| 69 | |||
| 1482 | vana | 70 | |
| 435 | jermar | 71 | /** Process Interval Timer interrupt. */ |
| 72 | void it_interrupt(void) |
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| 73 | { |
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| 1780 | jermar | 74 | int64_t c; |
| 75 | int64_t m; |
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| 1482 | vana | 76 | |
| 435 | jermar | 77 | eoi_write(EOI); |
| 1482 | vana | 78 | |
| 79 | m=itm_read(); |
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| 80 | |||
| 81 | while(1) |
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| 82 | { |
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| 83 | |||
| 84 | c=itc_read(); |
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| 85 | c+=IT_SERVICE_CLOCKS; |
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| 86 | |||
| 87 | m+=IT_DELTA; |
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| 88 | if(m-c<0) |
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| 89 | { |
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| 90 | CPU->missed_clock_ticks++; |
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| 91 | } |
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| 92 | else break; |
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| 93 | } |
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| 94 | |||
| 95 | itm_write(m); |
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| 456 | jermar | 96 | srlz_d(); /* propagate changes */ |
| 1482 | vana | 97 | |
| 98 | |||
| 99 | |||
| 435 | jermar | 100 | clock(); |
| 521 | vana | 101 | poll_keyboard(); |
| 435 | jermar | 102 | } |
| 1702 | cejka | 103 | |
| 104 | /** @} |
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| 105 | */ |
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| 106 |