From 61ba976360804d85f9203821518bb4b132852188 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Tue, 22 Feb 2000 18:39:52 +0000
Subject: New port of RTEMS to TI C3x and C4x.

---
 c/src/exec/score/cpu/c4x/irq.c | 82 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 c/src/exec/score/cpu/c4x/irq.c

(limited to 'c/src/exec/score/cpu/c4x/irq.c')

diff --git a/c/src/exec/score/cpu/c4x/irq.c b/c/src/exec/score/cpu/c4x/irq.c
new file mode 100644
index 0000000000..917198ef0c
--- /dev/null
+++ b/c/src/exec/score/cpu/c4x/irq.c
@@ -0,0 +1,82 @@
+/*
+ *  XXX CPU Dependent Source
+ *
+ *
+ *  COPYRIGHT (c) 1989-1999.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <rtems/system.h>
+#include <rtems/score/cpu.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/thread.h>
+
+/*
+ *  This routine provides the RTEMS interrupt management.
+ */
+
+#if( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE)
+  unsigned long    *_old_stack_ptr;
+#endif
+
+register unsigned long  *stack_ptr asm("sp");
+
+void __ISR_Handler(unsigned32 vector, void *isr_sp)
+{
+  register unsigned32 level;
+
+  /* already disabled when we get here */
+  /* _CPU_ISR_Disable( level ); */
+
+  _Thread_Dispatch_disable_level++;
+
+#if 0
+  if ( stack_ptr > (_Thread_Executing->Start.stack +
+            _Thread_Executing->Start.Initial_stack.size) ) {
+    printk( "Blown interrupt stack at 0x%x\n", stack_ptr );
+  }
+#endif
+
+#if( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE)
+  if ( _ISR_Nest_level == 0 ) {
+    /* Install irq stack */
+    _old_stack_ptr = stack_ptr;
+    stack_ptr = _CPU_Interrupt_stack_low;
+  }
+#endif
+
+  _ISR_Nest_level++;
+
+  /* leave it to the ISR to decide if they get reenabled */
+  /* _CPU_ISR_Enable( level ); */
+
+  /* call isp */
+  if ( _ISR_Vector_table[ vector] )
+    (*_ISR_Vector_table[ vector ])(
+       vector, isr_sp - sizeof(CPU_Interrupt_frame) + 1 );
+
+  _CPU_ISR_Disable( level );
+
+  _ISR_Nest_level--;
+
+#if( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE)
+  if ( _ISR_Nest_level == 0 )       /* restore old stack pointer */
+    stack_ptr = _old_stack_ptr;
+#endif
+
+  _Thread_Dispatch_disable_level--;
+
+  _CPU_ISR_Enable( level );
+  if ( _Thread_Dispatch_disable_level == 0 ) {
+    if ( _Context_Switch_necessary || !_ISR_Signals_to_thread_executing ) {
+       _ISR_Signals_to_thread_executing = FALSE;
+       _Thread_Dispatch();
+    }
+  }
+}
-- 
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