2002-08-14 Brett Swimley <brett.swimley@aedinc.net>

* cpu_asm.S: Per PR267, the _ISR_Handler() function never was modifying
	_ISR_Nest_level, and _Watchdog_Insert() requires this variable
	to be modified to determine if an interrupt may have modified
	the watchdog chain.  Prior to modifying _ISR_Handler(), I had
	a test that would fail if _ISR_Flash was not commented out in
	_Watchdog_Insert().  After this modification was made, my test
	ran flawlessly.

cpukit/score/cpu/m68k/ChangeLog

@@ -1,3 +1,13 @@
+2002-08-14	Brett Swimley <brett.swimley@aedinc.net>
+
+	* cpu_asm.S: Per PR267, the _ISR_Handler() function never was modifying
+	_ISR_Nest_level, and _Watchdog_Insert() requires this variable
+	to be modified to determine if an interrupt may have modified
+	the watchdog chain.  Prior to modifying _ISR_Handler(), I had
+	a test that would fail if _ISR_Flash was not commented out in
+	_Watchdog_Insert().  After this modification was made, my test
+	ran flawlessly.
+
 2002-08-05	Joel Sherrill <joel@OARcorp.com>
 
 	* Per PR260 eliminate use of make-target-options.  This impacted

cpukit/score/cpu/m68k/cpu_asm.S

@@ -139,6 +139,8 @@ SYM (_ISR_Handler):
 
 
 #if ( CPU_HAS_SOFTWARE_INTERRUPT_STACK == 1 )
+	tstl	SYM (_ISR_Nest_level)	| Interrupting an interrupt handler?
+	bne	2f			| Yes, just skip over stack switch code
 	movel	_CPU_Interrupt_stack_high,a0	| a0 now point just above interrupt stack
 	cmpl	_CPU_Interrupt_stack_low,a7	| stack below interrupt stack?
 	bcs.b	1f			| yes, switch to interrupt stack
@@ -151,6 +153,8 @@ SYM (_ISR_Handler):
 2:
 #endif /* CPU_HAS_SOFTWARE_INTERRUPT_STACK == 1 */
 
+	addql   #1,SYM(_ISR_Nest_level)	| one nest level deeper
+        
         movel   SYM (_ISR_Vector_table),a0 | a0= base of RTEMS table
 #if ( M68K_HAS_PREINDEXING == 1 )
         movel   (a0,d0:w:1),a0           | a0 = address of user routine
@@ -165,14 +169,17 @@ SYM (_ISR_Handler):
         addql   #4,a7                    | remove vector number
 
 #if ( CPU_HAS_SOFTWARE_INTERRUPT_STACK == 1 )
+	subql	#1,SYM(_ISR_Nest_level)	| Reduce interrupt-nesting count
+	bne	1f			| Skip if return to interrupt
 	movel	_CPU_Interrupt_stack_high,a0
 	subql	#4,a0
 	cmpl	a0,a7			| At top of interrupt stack?
 	bne.b	1f			| No, do not restore task stack pointer
 	movel	(a7),a7			| Restore task stack pointer
 1:
+#else
+	subql   #1,SYM (_ISR_Nest_level) | one less nest level
 #endif /* CPU_HAS_SOFTWARE_INTERRUPT_STACK == 1 */
-
         subql   #1,SYM (_Thread_Dispatch_disable_level)
                                          | unnest multitasking
         bne.b    exit                    | If dispatch disabled, exit

cpukit/score/cpu/m68k/rtems/score/cpu.h

@@ -84,7 +84,7 @@ extern "C" {
 #define CPU_IDLE_TASK_IS_FP              FALSE
 #define CPU_USE_DEFERRED_FP_SWITCH       TRUE
 
-#define CPU_PROVIDES_IDLE_THREAD_BODY    FALSE
+#define CPU_PROVIDES_IDLE_THREAD_BODY    TRUE
 #define CPU_STACK_GROWS_UP               FALSE
 #define CPU_STRUCTURE_ALIGNMENT
 
@@ -416,6 +416,17 @@ unsigned32 _CPU_ISR_Get_level( void );
 
 /* end of Context handler macros */
 
+/*
+ *  _CPU_Thread_Idle_body
+ *
+ *  This routine is the CPU dependent IDLE thread body.
+ *
+ *  NOTE:  It need only be provided if CPU_PROVIDES_IDLE_THREAD_BODY
+ *         is TRUE.
+ */
+
+void _CPU_Thread_Idle_body( void );
+
 /*
  *  Fatal Error manager macros
  *