source: rtems/cpukit/score/cpu/avr/cpu.c @ d0279f6e

4.9
Last change on this file since d0279f6e was 3c87adba, checked in by Joel Sherrill <joel.sherrill@…>, on Jul 31, 2008 at 2:55:56 PM

2008-07-31 Joel Sherrill <joel.sherrill@…>

  • cpu.c, rtems/score/cpu.h: Correct prototype of Idle threads.
  • Property mode set to 100644
File size: 4.1 KB
Line 
1/*
2 *  XXX CPU Dependent Source
3 *
4 *
5 *  COPYRIGHT (c) 1989-1999.
6 *  On-Line Applications Research Corporation (OAR).
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.rtems.com/license/LICENSE.
11 *
12 *  $Id$
13 */
14
15#include <rtems/system.h>
16#include <rtems/score/isr.h>
17#include <rtems/score/wkspace.h>
18
19/*  _CPU_Initialize
20 *
21 *  This routine performs processor dependent initialization.
22 *
23 *  INPUT PARAMETERS:
24 *    thread_dispatch - address of disptaching routine
25 *
26 *  NO_CPU Specific Information:
27 *
28 *  XXX document implementation including references if appropriate
29 */
30
31
32void _CPU_Initialize(
33  void      (*thread_dispatch)      /* ignored on this CPU */
34)
35{
36  /*
37   *  The thread_dispatch argument is the address of the entry point
38   *  for the routine called at the end of an ISR once it has been
39   *  decided a context switch is necessary.  On some compilation
40   *  systems it is difficult to call a high-level language routine
41   *  from assembly.  This allows us to trick these systems.
42   *
43   *  If you encounter this problem save the entry point in a CPU
44   *  dependent variable.
45   */
46
47  _CPU_Thread_dispatch_pointer = thread_dispatch;
48
49  /*
50   *  If there is not an easy way to initialize the FP context
51   *  during Context_Initialize, then it is usually easier to
52   *  save an "uninitialized" FP context here and copy it to
53   *  the task's during Context_Initialize.
54   */
55
56  /* FP context initialization support goes here */
57}
58
59/*PAGE
60 *
61 *  _CPU_ISR_Get_level
62 *
63 *  NO_CPU Specific Information:
64 *
65 *  XXX document implementation including references if appropriate
66 */
67 
68uint32_t   _CPU_ISR_Get_level( void )
69{
70  /*
71   *  This routine returns the current interrupt level.
72   */
73
74  return 0;
75}
76
77/*PAGE
78 *
79 *  _CPU_ISR_install_raw_handler
80 *
81 *  NO_CPU Specific Information:
82 *
83 *  XXX document implementation including references if appropriate
84 */
85 
86void _CPU_ISR_install_raw_handler(
87  uint32_t    vector,
88  proc_ptr    new_handler,
89  proc_ptr   *old_handler
90)
91{
92  /*
93   *  This is where we install the interrupt handler into the "raw" interrupt
94   *  table used by the CPU to dispatch interrupt handlers.
95   */
96}
97
98/*PAGE
99 *
100 *  _CPU_ISR_install_vector
101 *
102 *  This kernel routine installs the RTEMS handler for the
103 *  specified vector.
104 *
105 *  Input parameters:
106 *    vector      - interrupt vector number
107 *    old_handler - former ISR for this vector number
108 *    new_handler - replacement ISR for this vector number
109 *
110 *  Output parameters:  NONE
111 *
112 *
113 *  NO_CPU Specific Information:
114 *
115 *  XXX document implementation including references if appropriate
116 */
117
118void _CPU_ISR_install_vector(
119  uint32_t    vector,
120  proc_ptr    new_handler,
121  proc_ptr   *old_handler
122)
123{
124   *old_handler = _ISR_Vector_table[ vector ];
125
126   /*
127    *  If the interrupt vector table is a table of pointer to isr entry
128    *  points, then we need to install the appropriate RTEMS interrupt
129    *  handler for this vector number.
130    */
131
132   _CPU_ISR_install_raw_handler( vector, new_handler, old_handler );
133
134   /*
135    *  We put the actual user ISR address in '_ISR_vector_table'.  This will
136    *  be used by the _ISR_Handler so the user gets control.
137    */
138
139    _ISR_Vector_table[ vector ] = new_handler;
140}
141
142/*PAGE
143 *
144 *  _CPU_Install_interrupt_stack
145 *
146 *  NO_CPU Specific Information:
147 *
148 *  XXX document implementation including references if appropriate
149 */
150
151void _CPU_Install_interrupt_stack( void )
152{
153}
154
155/*PAGE
156 *
157 *  _CPU_Thread_Idle_body
158 *
159 *  NOTES:
160 *
161 *  1. This is the same as the regular CPU independent algorithm.
162 *
163 *  2. If you implement this using a "halt", "idle", or "shutdown"
164 *     instruction, then don't forget to put it in an infinite loop.
165 *
166 *  3. Be warned. Some processors with onboard DMA have been known
167 *     to stop the DMA if the CPU were put in IDLE mode.  This might
168 *     also be a problem with other on-chip peripherals.  So use this
169 *     hook with caution.
170 *
171 *  NO_CPU Specific Information:
172 *
173 *  XXX document implementation including references if appropriate
174 */
175
176void *_CPU_Thread_Idle_body( uint32_t ignored )
177{
178
179  for( ; ; )
180    /* insert your "halt" instruction here */ ;
181}
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