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comparison packages/hal/i386/pc/current/src/var_misc.c @ 76:435cced73e2f ecos-v1_3_1-release

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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
author jlarmour
date Tue, 28 Mar 2000 14:10:45 +0000
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75:41bf073c0c32 76:435cced73e2f
1 //==========================================================================
2 //
3 // var_misc.c
4 //
5 // HAL implementation miscellaneous functions
6 //
7 //==========================================================================
8 //####COPYRIGHTBEGIN####
9 //
10 // -------------------------------------------
11 // The contents of this file are subject to the Red Hat eCos Public License
12 // Version 1.1 (the "License"); you may not use this file except in
13 // compliance with the License. You may obtain a copy of the License at
14 // http://www.redhat.com/
15 //
16 // Software distributed under the License is distributed on an "AS IS"
17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
18 // License for the specific language governing rights and limitations under
19 // the License.
20 //
21 // The Original Code is eCos - Embedded Configurable Operating System,
22 // released September 30, 1998.
23 //
24 // The Initial Developer of the Original Code is Red Hat.
25 // Portions created by Red Hat are
26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
27 // All Rights Reserved.
28 // -------------------------------------------
29 //
30 //####COPYRIGHTEND####
31 //==========================================================================
32 //#####DESCRIPTIONBEGIN####
33 //
34 // Author(s): nickg
35 // Contributors: nickg, jlarmour, pjo
36 // Date: 1999-01-21
37 // Purpose: HAL miscellaneous functions
38 // Description: This file contains miscellaneous functions provided by the
39 // HAL.
40 //
41 //####DESCRIPTIONEND####
42 //
43 //========================================================================*/
44
45 #include <pkgconf/hal.h>
46
47 #include <cyg/infra/cyg_type.h> // Base types
48 #include <cyg/infra/cyg_trac.h> // tracing macros
49 #include <cyg/infra/cyg_ass.h> // assertion macros
50
51 #include <cyg/hal/hal_intr.h>
52
53 #include <cyg/hal/plf_misc.h>
54
55 /*------------------------------------------------------------------------*/
56 // Array which stores the configured priority levels for the configured
57 // interrupts.
58
59 volatile CYG_BYTE hal_interrupt_level[CYGNUM_HAL_ISR_COUNT];
60
61 /*------------------------------------------------------------------------*/
62
63 void hal_variant_init(void)
64 {
65 #ifdef CYGPKG_KERNEL
66 { int i ;
67
68 // Write all of the interrupt vectors to point to us.
69 for (i = 0; i < CYGNUM_HAL_ISR_COUNT; i++)
70 { hal_pc_interrupt_attach(i, (CYG_ADDRESS)cyg_hal_default_isr, 0, 0) ;
71 }
72 }
73 #endif /* CYGPKG_KERNEL */
74 }
75
76
77 // pjo, 5 oct 1999
78
79 void hal_pc_clock_initialize(cyg_uint32 period)
80 {
81 /* Select mode 3: square wave. Then we'll load LSB, and finally MSB. */
82 pc_outb(PC_PIT_CONTROL, 0x36) ;
83 pc_outb(PC_PIT_CLOCK_0, period); /* Only the LSB makes it to the bus. */
84 pc_outb(PC_PIT_CLOCK_0, period >> 8); /* Now the second 8 bits. */
85 }
86
87
88 void hal_pc_clock_read(cyg_uint32 * count)
89 {
90 cyg_uint32 curr ;
91 cyg_uint32 interruptState ;
92
93 /* Hold off on interrupts for a bit. */
94 HAL_DISABLE_INTERRUPTS(interruptState) ;
95
96 /* Latch counter 0. */
97 pc_outb(PC_PIT_CONTROL, 0x00);
98
99 /* Now get the value. */
100 curr = pc_inb(PC_PIT_CLOCK_0) & 0xFF ;
101 curr |= ((pc_inb(PC_PIT_CLOCK_0) & 0xFF) << 8);
102
103 /* (Maybe) restore interrupts. */
104 HAL_RESTORE_INTERRUPTS(interruptState) ;
105
106 count[0] = CYGNUM_HAL_RTC_PERIOD - curr ;
107 }
108
109 #if 0
110 void hal_idle_thread_action(cyg_uint32 loop_count)
111 { asm("hlt") ;
112 }
113 #endif
114
115 void hal_ctrlc_isr_init(void)
116 {
117 }
118
119
120 /*------------------------------------------------------------------------*/
121 /* End of var_misc.c */