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| Rev | Author | Line No. | Line |
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| 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 | |||
| 29 | /** Interval Timer driver. */ |
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| 30 | |||
| 31 | #include <arch/drivers/it.h> |
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| 577 | palkovsky | 32 | #include <arch/ski/ski.h> |
| 435 | jermar | 33 | #include <arch/interrupt.h> |
| 34 | #include <arch/register.h> |
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| 35 | #include <arch/asm.h> |
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| 36 | #include <arch/barrier.h> |
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| 37 | #include <time/clock.h> |
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| 1482 | vana | 38 | #include <arch.h> |
| 435 | jermar | 39 | |
| 519 | vana | 40 | |
| 1482 | vana | 41 | #define IT_SERVICE_CLOCKS 64 |
| 42 | |||
| 435 | jermar | 43 | /** Initialize Interval Timer. */ |
| 44 | void it_init(void) |
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| 45 | { |
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| 46 | cr_itv_t itv; |
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| 47 | |||
| 48 | /* initialize Interval Timer external interrupt vector */ |
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| 49 | itv.value = itv_read(); |
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| 50 | itv.vector = INTERRUPT_TIMER; |
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| 51 | itv.m = 0; |
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| 52 | itv_write(itv.value); |
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| 53 | |||
| 54 | /* set Interval Timer Counter to zero */ |
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| 55 | itc_write(0); |
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| 56 | |||
| 57 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
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| 58 | itm_write(IT_DELTA); |
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| 456 | jermar | 59 | |
| 60 | /* propagate changes */ |
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| 435 | jermar | 61 | srlz_d(); |
| 62 | } |
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| 63 | |||
| 1482 | vana | 64 | |
| 435 | jermar | 65 | /** Process Interval Timer interrupt. */ |
| 66 | void it_interrupt(void) |
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| 67 | { |
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| 1482 | vana | 68 | __s64 c; |
| 69 | __s64 m; |
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| 70 | |||
| 435 | jermar | 71 | eoi_write(EOI); |
| 1482 | vana | 72 | |
| 73 | m=itm_read(); |
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| 74 | |||
| 75 | while(1) |
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| 76 | { |
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| 77 | |||
| 78 | c=itc_read(); |
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| 79 | c+=IT_SERVICE_CLOCKS; |
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| 80 | |||
| 81 | m+=IT_DELTA; |
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| 82 | if(m-c<0) |
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| 83 | { |
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| 84 | CPU->missed_clock_ticks++; |
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| 85 | } |
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| 86 | else break; |
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| 87 | } |
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| 88 | |||
| 89 | itm_write(m); |
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| 456 | jermar | 90 | srlz_d(); /* propagate changes */ |
| 1482 | vana | 91 | |
| 92 | |||
| 93 | |||
| 435 | jermar | 94 | clock(); |
| 521 | vana | 95 | poll_keyboard(); |
| 435 | jermar | 96 | } |