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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 | /** @addtogroup ia64 |
|
- | 30 | * @{ |
|
- | 31 | */ |
|
- | 32 | /** @file |
|
- | 33 | */ |
|
- | 34 | ||
29 | /** Interval Timer driver. */ |
35 | /** Interval Timer driver. */ |
30 | 36 | ||
31 | #include <arch/drivers/it.h> |
37 | #include <arch/drivers/it.h> |
32 | #include <arch/ski/ski.h> |
38 | #include <arch/ski/ski.h> |
33 | #include <arch/interrupt.h> |
39 | #include <arch/interrupt.h> |
34 | #include <arch/register.h> |
40 | #include <arch/register.h> |
35 | #include <arch/asm.h> |
41 | #include <arch/asm.h> |
36 | #include <arch/barrier.h> |
42 | #include <arch/barrier.h> |
37 | #include <time/clock.h> |
43 | #include <time/clock.h> |
38 | #include <arch.h> |
44 | #include <arch.h> |
39 | 45 | ||
40 | 46 | ||
41 | #define IT_SERVICE_CLOCKS 64 |
47 | #define IT_SERVICE_CLOCKS 64 |
42 | 48 | ||
43 | /** Initialize Interval Timer. */ |
49 | /** Initialize Interval Timer. */ |
44 | void it_init(void) |
50 | void it_init(void) |
45 | { |
51 | { |
46 | cr_itv_t itv; |
52 | cr_itv_t itv; |
47 | 53 | ||
48 | /* initialize Interval Timer external interrupt vector */ |
54 | /* initialize Interval Timer external interrupt vector */ |
49 | itv.value = itv_read(); |
55 | itv.value = itv_read(); |
50 | itv.vector = INTERRUPT_TIMER; |
56 | itv.vector = INTERRUPT_TIMER; |
51 | itv.m = 0; |
57 | itv.m = 0; |
52 | itv_write(itv.value); |
58 | itv_write(itv.value); |
53 | 59 | ||
54 | /* set Interval Timer Counter to zero */ |
60 | /* set Interval Timer Counter to zero */ |
55 | itc_write(0); |
61 | itc_write(0); |
56 | 62 | ||
57 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
63 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
58 | itm_write(IT_DELTA); |
64 | itm_write(IT_DELTA); |
59 | 65 | ||
60 | /* propagate changes */ |
66 | /* propagate changes */ |
61 | srlz_d(); |
67 | srlz_d(); |
62 | } |
68 | } |
63 | 69 | ||
64 | 70 | ||
65 | /** Process Interval Timer interrupt. */ |
71 | /** Process Interval Timer interrupt. */ |
66 | void it_interrupt(void) |
72 | void it_interrupt(void) |
67 | { |
73 | { |
68 | __s64 c; |
74 | __s64 c; |
69 | __s64 m; |
75 | __s64 m; |
70 | 76 | ||
71 | eoi_write(EOI); |
77 | eoi_write(EOI); |
72 | 78 | ||
73 | m=itm_read(); |
79 | m=itm_read(); |
74 | 80 | ||
75 | while(1) |
81 | while(1) |
76 | { |
82 | { |
77 | 83 | ||
78 | c=itc_read(); |
84 | c=itc_read(); |
79 | c+=IT_SERVICE_CLOCKS; |
85 | c+=IT_SERVICE_CLOCKS; |
80 | 86 | ||
81 | m+=IT_DELTA; |
87 | m+=IT_DELTA; |
82 | if(m-c<0) |
88 | if(m-c<0) |
83 | { |
89 | { |
84 | CPU->missed_clock_ticks++; |
90 | CPU->missed_clock_ticks++; |
85 | } |
91 | } |
86 | else break; |
92 | else break; |
87 | } |
93 | } |
88 | 94 | ||
89 | itm_write(m); |
95 | itm_write(m); |
90 | srlz_d(); /* propagate changes */ |
96 | srlz_d(); /* propagate changes */ |
91 | 97 | ||
92 | 98 | ||
93 | 99 | ||
94 | clock(); |
100 | clock(); |
95 | poll_keyboard(); |
101 | poll_keyboard(); |
96 | } |
102 | } |
- | 103 | ||
- | 104 | /** @} |
|
- | 105 | */ |
|
- | 106 | ||
97 | 107 |