Rev 1787 | Rev 1942 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
435 | jermar | 1 | /* |
2 | * Copyright (C) 2005 Jakub Jermar |
||
3 | * All rights reserved. |
||
4 | * |
||
5 | * Redistribution and use in source and binary forms, with or without |
||
6 | * modification, are permitted provided that the following conditions |
||
7 | * are met: |
||
8 | * |
||
9 | * - Redistributions of source code must retain the above copyright |
||
10 | * notice, this list of conditions and the following disclaimer. |
||
11 | * - Redistributions in binary form must reproduce the above copyright |
||
12 | * notice, this list of conditions and the following disclaimer in the |
||
13 | * documentation and/or other materials provided with the distribution. |
||
14 | * - The name of the author may not be used to endorse or promote products |
||
15 | * derived from this software without specific prior written permission. |
||
16 | * |
||
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
27 | */ |
||
28 | |||
1881 | jermar | 29 | /** @addtogroup ia64 |
1702 | cejka | 30 | * @{ |
31 | */ |
||
32 | /** @file |
||
33 | */ |
||
34 | |||
435 | jermar | 35 | /** Interval Timer driver. */ |
36 | |||
37 | #include <arch/drivers/it.h> |
||
577 | palkovsky | 38 | #include <arch/ski/ski.h> |
435 | jermar | 39 | #include <arch/interrupt.h> |
40 | #include <arch/register.h> |
||
41 | #include <arch/asm.h> |
||
42 | #include <arch/barrier.h> |
||
43 | #include <time/clock.h> |
||
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) |
||
51 | { |
||
52 | cr_itv_t itv; |
||
53 | |||
54 | /* initialize Interval Timer external interrupt vector */ |
||
55 | itv.value = itv_read(); |
||
56 | itv.vector = INTERRUPT_TIMER; |
||
57 | itv.m = 0; |
||
58 | itv_write(itv.value); |
||
59 | |||
60 | /* set Interval Timer Counter to zero */ |
||
61 | itc_write(0); |
||
62 | |||
63 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
||
64 | itm_write(IT_DELTA); |
||
456 | jermar | 65 | |
66 | /* propagate changes */ |
||
435 | jermar | 67 | srlz_d(); |
68 | } |
||
69 | |||
1482 | vana | 70 | |
435 | jermar | 71 | /** Process Interval Timer interrupt. */ |
72 | void it_interrupt(void) |
||
73 | { |
||
1780 | jermar | 74 | int64_t c; |
75 | int64_t m; |
||
1482 | vana | 76 | |
435 | jermar | 77 | eoi_write(EOI); |
1482 | vana | 78 | |
1881 | jermar | 79 | m = itm_read(); |
1482 | vana | 80 | |
1881 | jermar | 81 | while (1) { |
82 | c = itc_read(); |
||
83 | c += IT_SERVICE_CLOCKS; |
||
1482 | vana | 84 | |
1881 | jermar | 85 | m += IT_DELTA; |
86 | if (m-c<0) |
||
1482 | vana | 87 | CPU->missed_clock_ticks++; |
1881 | jermar | 88 | else |
89 | break; |
||
1482 | vana | 90 | } |
91 | |||
92 | itm_write(m); |
||
456 | jermar | 93 | srlz_d(); /* propagate changes */ |
1482 | vana | 94 | |
435 | jermar | 95 | clock(); |
521 | vana | 96 | poll_keyboard(); |
435 | jermar | 97 | } |
1702 | cejka | 98 | |
1881 | jermar | 99 | /** @} |
1702 | cejka | 100 | */ |