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1 | /* |
1 | /* |
2 | * Copyright (C) 2005 Jakub Jermar |
2 | * Copyright (C) 2005 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** Interval Timer driver. */ |
29 | /** Interval Timer driver. */ |
30 | 30 | ||
31 | #include <arch/drivers/it.h> |
31 | #include <arch/drivers/it.h> |
32 | #include <arch/ski/ski.h> |
32 | #include <arch/ski/ski.h> |
33 | #include <arch/interrupt.h> |
33 | #include <arch/interrupt.h> |
34 | #include <arch/register.h> |
34 | #include <arch/register.h> |
35 | #include <arch/asm.h> |
35 | #include <arch/asm.h> |
36 | #include <arch/barrier.h> |
36 | #include <arch/barrier.h> |
37 | #include <time/clock.h> |
37 | #include <time/clock.h> |
- | 38 | #include <arch.h> |
|
38 | 39 | ||
39 | 40 | ||
- | 41 | #define IT_SERVICE_CLOCKS 64 |
|
- | 42 | ||
40 | /** Initialize Interval Timer. */ |
43 | /** Initialize Interval Timer. */ |
41 | void it_init(void) |
44 | void it_init(void) |
42 | { |
45 | { |
43 | cr_itv_t itv; |
46 | cr_itv_t itv; |
44 | 47 | ||
45 | /* initialize Interval Timer external interrupt vector */ |
48 | /* initialize Interval Timer external interrupt vector */ |
46 | itv.value = itv_read(); |
49 | itv.value = itv_read(); |
47 | itv.vector = INTERRUPT_TIMER; |
50 | itv.vector = INTERRUPT_TIMER; |
48 | itv.m = 0; |
51 | itv.m = 0; |
49 | itv_write(itv.value); |
52 | itv_write(itv.value); |
50 | 53 | ||
51 | /* set Interval Timer Counter to zero */ |
54 | /* set Interval Timer Counter to zero */ |
52 | itc_write(0); |
55 | itc_write(0); |
53 | 56 | ||
54 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
57 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
55 | itm_write(IT_DELTA); |
58 | itm_write(IT_DELTA); |
56 | 59 | ||
57 | /* propagate changes */ |
60 | /* propagate changes */ |
58 | srlz_d(); |
61 | srlz_d(); |
59 | } |
62 | } |
60 | 63 | ||
- | 64 | ||
61 | /** Process Interval Timer interrupt. */ |
65 | /** Process Interval Timer interrupt. */ |
62 | void it_interrupt(void) |
66 | void it_interrupt(void) |
63 | { |
67 | { |
- | 68 | __s64 c; |
|
- | 69 | __s64 m; |
|
- | 70 | ||
64 | eoi_write(EOI); |
71 | eoi_write(EOI); |
- | 72 | ||
- | 73 | m=itm_read(); |
|
- | 74 | ||
- | 75 | while(1) |
|
- | 76 | { |
|
- | 77 | ||
- | 78 | c=itc_read(); |
|
- | 79 | c+=IT_SERVICE_CLOCKS; |
|
- | 80 | ||
- | 81 | m+=IT_DELTA; |
|
- | 82 | if(m-c<0) |
|
- | 83 | { |
|
65 | itm_write(itc_read() + IT_DELTA); /* program next interruption */ |
84 | CPU->missed_clock_ticks++; |
- | 85 | } |
|
- | 86 | else break; |
|
- | 87 | } |
|
- | 88 | ||
- | 89 | itm_write(m); |
|
66 | srlz_d(); /* propagate changes */ |
90 | srlz_d(); /* propagate changes */ |
- | 91 | ||
- | 92 | ||
- | 93 | ||
67 | clock(); |
94 | clock(); |
68 | poll_keyboard(); |
95 | poll_keyboard(); |
69 | } |
96 | } |
70 | 97 |