New files -- from rtems-LM-980406 which was based on an RTEMS from 12/97.

This was called the dmv170 BSP in that source tree but since the DMV171
is now obsolete, we have transitioned to the DMV177 and have no intention
of checking compatibility with any other models.

1 files changed, 184 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/powerpc/dmv177/startup/genpvec.c b/c/src/lib/libbsp/powerpc/dmv177/startup/genpvec.c
new file mode 100644
index 0000000000..98989c2401
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/dmv177/startup/genpvec.c
@@ -0,0 +1,184 @@
+/*  genpvec.c
+ *
+ *  These routines handle the external exception.  Multiple ISRs occur off
+ *  of this one interrupt.  This method will allow multiple ISRs to be
+ *  called using the same IRQ index.  However, removing the ISR routines is
+ *  presently not supported.
+ *
+ *  The external exception vector numbers begin with DMV170_IRQ_FIRST.
+ *  DMV170_IRQ_FIRST is defined to be one greater than the last processor
+ *  interrupt.  
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may in
+ *  the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id: 
+ */
+
+#include <bsp.h>
+#include "chain.h"
+#include <assert.h>
+
+#define   NUM_LIRQ_HANDLERS   20
+#define   NUM_LIRQ            ( MAX_BOARD_IRQS - PPC_IRQ_LAST )
+
+/* 
+ * Structure to for one of possible multiple interrupt handlers for 
+ * a given interrupt.
+ */
+typedef struct
+{
+  Chain_Node          Node;
+  rtems_isr_entry     handler;                  /* isr routine        */
+  rtems_vector_number vector;                   /* vector number      */
+} EE_ISR_Type;
+
+/*
+ * Note:  The following will not work if we add a method to remove
+ *        handlers at a later time.
+ */
+EE_ISR_Type       ISR_Nodes [NUM_LIRQ_HANDLERS];
+rtems_unsigned16  Nodes_Used; 
+Chain_Control     ISR_Array  [NUM_LIRQ];
+
+
+/*  PAGE
+ *
+ *  initialize_external_exception_vector
+ *
+ *  This routine initializes the external exception vector
+ * 
+ *  Input parameters: NONE
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values: NONE
+ */
+
+void initialize_external_exception_vector ()
+{
+  int i;
+  rtems_isr_entry previous_isr;
+  rtems_status_code status;
+
+  Nodes_Used = 0;
+
+  for (i=0; i <NUM_LIRQ; i++)
+    Chain_Initialize_empty( &ISR_Array[i] );
+
+  /*  
+   * Install external_exception_ISR () as the handler for 
+   *  the General Purpose Interrupt.
+   */
+
+  status = rtems_interrupt_catch( external_exception_ISR, 
+           PPC_IRQ_EXTERNAL , (rtems_isr_entry *) &previous_isr );
+}
+
+/*  PAGE
+ *
+ *  set_EE_vector
+ *
+ *  This routine installs one of multiple ISRs for the general purpose 
+ *  inerrupt.
+ *
+ *  Input parameters:
+ *    handler - handler to call at exception
+ *    vector  - vector number associated with this handler.
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:
+ */
+rtems_isr_entry  set_EE_vector(
+  rtems_isr_entry     handler,      /* isr routine        */
+  rtems_vector_number vector        /* vector number      */
+)
+{
+  rtems_unsigned16 vec_idx  = vector - DMV170_IRQ_FIRST;
+  rtems_unsigned32 index;
+  
+  /* 
+   *  Verify that all of the nodes have not been used.
+   */
+  assert  (Nodes_Used < NUM_LIRQ_HANDLERS);
+   
+  /*
+   *  If we have already installed this handler for this vector, then
+   *  just reset it.
+   */
+
+  for ( index=0 ; index <= Nodes_Used ; index++ ) {
+    if ( ISR_Nodes[index].vector == vector &&
+         ISR_Nodes[index].handler == handler )
+      return 0;
+  }
+
+  /*
+   * Increment the number of nedes used and set the index for the node
+   * array.
+   */
+  
+  Nodes_Used++; 
+  index = Nodes_Used - 1;
+
+  /*
+   * Write the values of the handler and the vector to this node.
+   */
+  ISR_Nodes[index].handler = handler;
+  ISR_Nodes[index].vector  = vector;
+
+  /*
+   * Connect this node to the chain at the location of the 
+   * vector index.  
+   */
+  Chain_Append( &ISR_Array[vec_idx], &ISR_Nodes[index].Node );
+
+  /*
+   * No interrupt service routine was removed so return 0
+   */
+  return 0;
+}
+
+/*  PAGE
+ *
+ * external_exception_ISR
+ *
+ * This interrupt service routine is called for an External Exception.
+ *
+ *  Input parameters:
+ *    vector - vector number representing the external exception vector.
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values: 
+ */
+
+rtems_isr external_exception_ISR (
+  rtems_vector_number   vector             /* IN  */
+)
+{ 
+ rtems_unsigned16    index;
+ EE_ISR_Type         *node;
+ 
+ /*
+  * Read vector.
+  */
+ index = 0;
+
+ node = ISR_Array[ index ].first;
+ while ( !_Chain_Is_tail( &ISR_Array[ index ], node ) ) {
+   (*node->handler)( node->vector );
+   node = node->Node.next;
+ }
+
+ /*
+  * Clear the interrupt.
+  */
+}
+