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