source: rtems/cpukit/score/cpu/avr/cpu.c @ 3da35a18

4.104.115
Last change on this file since 3da35a18 was 3da35a18, checked in by Joel Sherrill <joel.sherrill@…>, on 07/23/09 at 17:40:06

2009-07-23 Joel Sherrill <joel.sherrill@…>

  • cpu.c, cpu_asm.S: Unsuccessful attempt to fix.
  • Property mode set to 100644
File size: 5.1 KB
Line 
1/*
2 *  AVR CPU Dependent Source
3 *
4 *
5 *  COPYRIGHT (c) 1989-2008.
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#include <rtems/bspIo.h> /* XXX remove me later */
20
21/*  _CPU_Initialize
22 *
23 *  This routine performs processor dependent initialization.
24 *
25 *  INPUT PARAMETERS: NONE
26 *
27 *  NO_CPU Specific Information:
28 *
29 *  XXX document implementation including references if appropriate
30 */
31void _CPU_Initialize(void)
32{
33  printk( "AVR CPU Initialize\n" );
34
35  /*
36   *  If there is not an easy way to initialize the FP context
37   *  during Context_Initialize, then it is usually easier to
38   *  save an "uninitialized" FP context here and copy it to
39   *  the task's during Context_Initialize.
40   */
41
42  /* FP context initialization support goes here */
43}
44
45/*PAGE
46 *
47 *  _CPU_Context_Initialize
48 *
49 *  This kernel routine initializes the basic non-FP context area associated
50 *  with each thread.
51 *
52 *  Input parameters:
53 *    the_context  - pointer to the context area
54 *    stack_base   - address of memory for the SPARC
55 *    size         - size in bytes of the stack area
56 *    new_level    - interrupt level for this context area
57 *    entry_point  - the starting execution point for this this context
58 *    is_fp        - TRUE if this context is associated with an FP thread
59 *
60 *  Output parameters: NONE
61 */
62
63void _CPU_Context_Initialize(
64  Context_Control  *the_context,
65  uint32_t         *stack_base,
66  uint32_t          size,
67  uint32_t          new_level,
68  void             *entry_point,
69  bool              is_fp
70)
71{
72  uint16_t stack;
73  uint16_t start;
74  uint16_t *tmpsp;
75
76  /* calc stack high end */
77  stack = (uint16_t) (stack_base) + (uint16_t) (size);
78
79  /* calc stack pointer initial value */
80  stack -= 2;
81
82  the_context->stack_pointer = stack;
83  tmpsp = (uint16_t *) stack;
84  start = (uint16_t) entry_point;
85  *tmpsp = start;
86#if 0
87  tmpsp[0] = start & 0xff;
88  tmpsp[1] = (start >> 8) & 0xff;
89#endif
90
91  /* FIXME on level */
92  if (new_level) the_context->status = 0;
93  else           the_context->status = 0;
94
95#if 1
96  printk("");
97  printk("the_context = 0x%x\n", the_context);
98  printk("entry = 0x%x\n", entry_point);
99  printk("sp = 0x%x\n\n",stack);
100#endif
101}
102
103
104/*PAGE
105 *
106 *  _CPU_ISR_Get_level
107 *
108 *  NO_CPU Specific Information:
109 *
110 *  XXX document implementation including references if appropriate
111 */
112 
113uint32_t   _CPU_ISR_Get_level( void )
114{
115  /*
116   *  This routine returns the current interrupt level.
117   */
118
119  return 0;
120}
121
122/*PAGE
123 *
124 *  _CPU_ISR_install_raw_handler
125 *
126 *  NO_CPU Specific Information:
127 *
128 *  XXX document implementation including references if appropriate
129 */
130 
131void _CPU_ISR_install_raw_handler(
132  uint32_t    vector,
133  proc_ptr    new_handler,
134  proc_ptr   *old_handler
135)
136{
137  /*
138   *  This is where we install the interrupt handler into the "raw" interrupt
139   *  table used by the CPU to dispatch interrupt handlers.
140   */
141}
142
143/*PAGE
144 *
145 *  _CPU_ISR_install_vector
146 *
147 *  This kernel routine installs the RTEMS handler for the
148 *  specified vector.
149 *
150 *  Input parameters:
151 *    vector      - interrupt vector number
152 *    old_handler - former ISR for this vector number
153 *    new_handler - replacement ISR for this vector number
154 *
155 *  Output parameters:  NONE
156 *
157 *
158 *  NO_CPU Specific Information:
159 *
160 *  XXX document implementation including references if appropriate
161 */
162
163void _CPU_ISR_install_vector(
164  uint32_t    vector,
165  proc_ptr    new_handler,
166  proc_ptr   *old_handler
167)
168{
169   *old_handler = _ISR_Vector_table[ vector ];
170
171   /*
172    *  If the interrupt vector table is a table of pointer to isr entry
173    *  points, then we need to install the appropriate RTEMS interrupt
174    *  handler for this vector number.
175    */
176
177   _CPU_ISR_install_raw_handler( vector, new_handler, old_handler );
178
179   /*
180    *  We put the actual user ISR address in '_ISR_vector_table'.  This will
181    *  be used by the _ISR_Handler so the user gets control.
182    */ 
183
184    _ISR_Vector_table[ vector ] = new_handler;
185}
186
187/*PAGE
188 *
189 *  _CPU_Install_interrupt_stack
190 *
191 *  NO_CPU Specific Information:
192 *
193 *  XXX document implementation including references if appropriate
194 */
195
196void _CPU_Install_interrupt_stack( void )
197{
198}
199
200/*PAGE
201 *
202 *  _CPU_Thread_Idle_body
203 *
204 *  NOTES:
205 *
206 *  1. This is the same as the regular CPU independent algorithm.
207 *
208 *  2. If you implement this using a "halt", "idle", or "shutdown"
209 *     instruction, then don't forget to put it in an infinite loop.
210 *
211 *  3. Be warned. Some processors with onboard DMA have been known
212 *     to stop the DMA if the CPU were put in IDLE mode.  This might
213 *     also be a problem with other on-chip peripherals.  So use this
214 *     hook with caution.
215 *
216 *  NO_CPU Specific Information:
217 *
218 *  XXX document implementation including references if appropriate
219 */
220
221void *_CPU_Thread_Idle_body( uintptr_t ignored )
222{
223
224  for( ; ; ) asm volatile ("sleep"::);
225    /* insert your "halt" instruction here */ ;
226  return (void *) 0;
227}
Note: See TracBrowser for help on using the repository browser.