source: rtems/cpukit/score/cpu/c4x/irq.c @ 5632f8d

4.104.11
Last change on this file since 5632f8d was 5632f8d, checked in by Joel Sherrill <joel.sherrill@…>, on Mar 27, 2010 at 3:02:21 PM

2010-03-27 Joel Sherrill <joel.sherrill@…>

  • cpu.c, cpu_asm.S, irq.c: Add include of config.h
  • Property mode set to 100644
File size: 2.0 KB
Line 
1/*
2 *  C4x 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#ifdef HAVE_CONFIG_H
16#include "config.h"
17#endif
18
19#include <rtems/system.h>
20#include <rtems/score/cpu.h>
21#include <rtems/score/isr.h>
22#include <rtems/score/thread.h>
23
24/*
25 *  This routine provides the RTEMS interrupt management.
26 */
27
28#if( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE)
29  unsigned long    *_old_stack_ptr;
30#endif
31
32register unsigned long  *stack_ptr asm("sp");
33
34void __ISR_Handler(uint32_t   vector, void *isr_sp)
35{
36  register uint32_t   level;
37
38  /* already disabled when we get here */
39  /* _CPU_ISR_Disable( level ); */
40
41  _Thread_Dispatch_disable_level++;
42
43#if 0
44  if ( stack_ptr > (_Thread_Executing->Start.stack +
45            _Thread_Executing->Start.Initial_stack.size) ) {
46    printk( "Blown interrupt stack at 0x%x\n", stack_ptr );
47  }
48#endif
49
50#if( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE)
51  if ( _ISR_Nest_level == 0 ) {
52    /* Install irq stack */
53    _old_stack_ptr = stack_ptr;
54    stack_ptr = _CPU_Interrupt_stack_low;
55  }
56#endif
57
58  _ISR_Nest_level++;
59
60  /* leave it to the ISR to decide if they get reenabled */
61  /* _CPU_ISR_Enable( level ); */
62
63  /* call isp */
64  if ( _ISR_Vector_table[ vector] )
65    (*_ISR_Vector_table[ vector ])(
66       vector, isr_sp - sizeof(CPU_Interrupt_frame) + 1 );
67
68  _CPU_ISR_Disable( level );
69
70  _ISR_Nest_level--;
71
72#if( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE)
73  if ( _ISR_Nest_level == 0 )       /* restore old stack pointer */
74    stack_ptr = _old_stack_ptr;
75#endif
76
77  _Thread_Dispatch_disable_level--;
78
79  _CPU_ISR_Enable( level );
80
81  if ( _ISR_Nest_level )
82    return;
83
84  if ( _Thread_Dispatch_disable_level ) {
85    _ISR_Signals_to_thread_executing = FALSE;
86    return;
87  }
88
89  if ( _Context_Switch_necessary || _ISR_Signals_to_thread_executing ) {
90    _ISR_Signals_to_thread_executing = FALSE;
91    _Thread_Dispatch();
92  }
93}
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