1 files changed, 105 insertions, 0 deletions
diff --git a/bsps/sh/gensh4/start/cpu_asm.c b/bsps/sh/gensh4/start/cpu_asm.c
new file mode 100644
index 0000000000..52a033bb75
--- /dev/null
+++ b/bsps/sh/gensh4/start/cpu_asm.c
@@ -0,0 +1,105 @@
+/*
+ *  This file contains the basic algorithms for all assembly code used
+ *  in an specific CPU port of RTEMS.  These algorithms must be implemented
+ *  in assembly language
+ *
+ *  NOTE:  This port uses a C file with inline assembler instructions
+ *
+ *  Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and
+ *           Bernd Becker (becker@faw.uni-ulm.de)
+ *
+ *  COPYRIGHT (c) 1997-1998, FAW Ulm, Germany
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *
+ *  COPYRIGHT (c) 1998.
+ *  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.rtems.org/license/LICENSE.
+ */
+
+/*
+ *  This is supposed to be an assembly file.  This means that system.h
+ *  and cpu.h should not be included in a "real" cpu_asm file.  An
+ *  implementation in assembly should include "cpu_asm.h"
+ */
+
+#include <rtems/system.h>
+#include <rtems/score/cpu.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/threaddispatch.h>
+#include <rtems/score/sh.h>
+#include <rtems/score/ispsh7750.h>
+#include <rtems/score/iosh7750.h>
+#include <rtems/score/sh4_regs.h>
+#include <rtems/score/sh_io.h>
+
+/* from cpu_isps.c */
+extern proc_ptr         _Hardware_isr_Table[];
+
+#if (CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE)
+  unsigned long    *_old_stack_ptr;
+#endif
+
+register unsigned long  *stack_ptr __asm__ ("r15");
+
+/*
+ *  This routine provides the RTEMS interrupt management.
+ */
+
+void __ISR_Handler( uint32_t   vector)
+{
+  ISR_Level level;
+
+  _ISR_Local_disable( level );
+
+   _Thread_Dispatch_disable();
+
+#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_high;
+    }
+
+#endif
+
+  _ISR_Nest_level++;
+
+  _ISR_Local_enable( level );
+
+  /* call isp */
+  if ( _ISR_Vector_table[ vector])
+    (*_ISR_Vector_table[ vector ])( vector );
+
+  _ISR_Local_disable( level );
+
+  _Thread_Dispatch_enable( _Per_CPU_Get() );
+
+  _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
+
+  _ISR_Local_enable( level );
+
+  if ( _ISR_Nest_level )
+    return;
+
+  if ( !_Thread_Dispatch_is_enabled() ) {
+    return;
+  }
+
+  if ( _Thread_Dispatch_necessary ) {
+    _Thread_Dispatch();
+  }
+}