source: rtems/cpukit/score/cpu/no_cpu/cpu.c @ 637df35

4.104.114.84.95
Last change on this file since 637df35 was 637df35, checked in by Joel Sherrill <joel.sherrill@…>, on Jul 12, 1995 at 7:47:25 PM

Ada95, gnat, go32

  • Property mode set to 100644
File size: 3.7 KB
Line 
1/*
2 *  XXX CPU Dependent Source
3 *
4 *
5 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
6 *  On-Line Applications Research Corporation (OAR).
7 *  All rights assigned to U.S. Government, 1994.
8 *
9 *  This material may be reproduced by or for the U.S. Government pursuant
10 *  to the copyright license under the clause at DFARS 252.227-7013.  This
11 *  notice must appear in all copies of this file and its derivatives.
12 *
13 *  $Id$
14 */
15
16#include <rtems/system.h>
17#include <rtems/fatal.h>
18#include <rtems/isr.h>
19#include <rtems/wkspace.h>
20
21/*  _CPU_Initialize
22 *
23 *  This routine performs processor dependent initialization.
24 *
25 *  INPUT PARAMETERS:
26 *    cpu_table       - CPU table to initialize
27 *    thread_dispatch - address of disptaching routine
28 */
29
30
31void _CPU_Initialize(
32  rtems_cpu_table  *cpu_table,
33  void      (*thread_dispatch)      /* ignored on this CPU */
34)
35{
36  if ( cpu_table == NULL )
37    rtems_fatal_error_occurred( RTEMS_NOT_CONFIGURED );
38
39  /*
40   *  The thread_dispatch argument is the address of the entry point
41   *  for the routine called at the end of an ISR once it has been
42   *  decided a context switch is necessary.  On some compilation
43   *  systems it is difficult to call a high-level language routine
44   *  from assembly.  This allows us to trick these systems.
45   *
46   *  If you encounter this problem save the entry point in a CPU
47   *  dependent variable.
48   */
49
50  _CPU_Thread_dispatch_pointer = thread_dispatch;
51
52  /*
53   *  If there is not an easy way to initialize the FP context
54   *  during Context_Initialize, then it is usually easier to
55   *  save an "uninitialized" FP context here and copy it to
56   *  the task's during Context_Initialize.
57   */
58
59  /* FP context initialization support goes here */
60
61  _CPU_Table = *cpu_table;
62}
63
64/*PAGE
65 *
66 *  _CPU_ISR_install_raw_handler
67 */
68 
69void _CPU_ISR_install_raw_handler(
70  unsigned32  vector,
71  proc_ptr    new_handler,
72  proc_ptr   *old_handler
73)
74{
75  /*
76   *  This is where we install the interrupt handler into the "raw" interrupt
77   *  table used by the CPU to dispatch interrupt handlers.
78   */
79}
80
81/*PAGE
82 *
83 *  _CPU_ISR_install_vector
84 *
85 *  This kernel routine installs the RTEMS handler for the
86 *  specified vector.
87 *
88 *  Input parameters:
89 *    vector      - interrupt vector number
90 *    old_handler - former ISR for this vector number
91 *    new_handler - replacement ISR for this vector number
92 *
93 *  Output parameters:  NONE
94 *
95 */
96
97void _CPU_ISR_install_vector(
98  unsigned32  vector,
99  proc_ptr    new_handler,
100  proc_ptr   *old_handler
101)
102{
103   *old_handler = _ISR_Vector_table[ vector ];
104
105   /*
106    *  If the interrupt vector table is a table of pointer to isr entry
107    *  points, then we need to install the appropriate RTEMS interrupt
108    *  handler for this vector number.
109    */
110
111   _CPU_ISR_install_raw_handler( vector, new_handler, old_handler );
112
113   /*
114    *  We put the actual user ISR address in '_ISR_vector_table'.  This will
115    *  be used by the _ISR_Handler so the user gets control.
116    */
117
118    _ISR_Vector_table[ vector ] = new_handler;
119}
120
121/*PAGE
122 *
123 *  _CPU_Install_interrupt_stack
124 */
125
126void _CPU_Install_interrupt_stack( void )
127{
128}
129
130/*PAGE
131 *
132 *  _CPU_Internal_threads_Idle_thread_body
133 *
134 *  NOTES:
135 *
136 *  1. This is the same as the regular CPU independent algorithm.
137 *
138 *  2. If you implement this using a "halt", "idle", or "shutdown"
139 *     instruction, then don't forget to put it in an infinite loop.
140 *
141 *  3. Be warned. Some processors with onboard DMA have been known
142 *     to stop the DMA if the CPU were put in IDLE mode.  This might
143 *     also be a problem with other on-chip peripherals.  So use this
144 *     hook with caution.
145 */
146
147void _CPU_Internal_threads_Idle_thread_body( void )
148{
149
150  for( ; ; )
151    /* insert your "halt" instruction here */ ;
152}
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