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+# ====================================================================
+#
+#      interrupts.cdl
+#
+#      configuration data related to kernel interrupt handling
+#
+# ====================================================================
+#####COPYRIGHTBEGIN####
+#                                                                          
+# -------------------------------------------                              
+# The contents of this file are subject to the Red Hat eCos Public License 
+# Version 1.1 (the "License"); you may not use this file except in         
+# compliance with the License.  You may obtain a copy of the License at    
+# http://www.redhat.com/                                                   
+#                                                                          
+# Software distributed under the License is distributed on an "AS IS"      
+# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+# License for the specific language governing rights and limitations under 
+# the License.                                                             
+#                                                                          
+# The Original Code is eCos - Embedded Configurable Operating System,      
+# released September 30, 1998.                                             
+#                                                                          
+# The Initial Developer of the Original Code is Red Hat.                   
+# Portions created by Red Hat are                                          
+# Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
+# All Rights Reserved.                                                     
+# -------------------------------------------                              
+#                                                                          
+#####COPYRIGHTEND####
+# ====================================================================
+######DESCRIPTIONBEGIN####
+#
+# Author(s):      bartv
+# Original data:  nickg
+# Contributors:
+# Date:           1999-06-13
+#
+#####DESCRIPTIONEND####
+#
+# ====================================================================
+
+# NOTE: the choice of list vs table should not be two separate
+# options. There is a single option which must have one of
+# two legal values.
+cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS {
+    display       "Use delayed service routines (DSRs)"
+    default_value 1
+    description   "
+        In eCos the recommended way to handle device interrupts is to
+        do a minimum amount of work inside the low level interrupt
+        handler itself, and instead do as much as possible in a
+        Delayed Service Routine or DSR. If an application does not
+        make use of DSRs directly or indirectly then it is possible
+        to disable the DSR support completely, which reduces the
+        overheads of context switches and interrupt handling. Note
+        that the kernel real-time clock makes use of DSRs, as do many
+        of the device drivers. "
+
+    cdl_interface CYGINT_KERNEL_INTERRUPTS_DSRS {
+        requires 1 == CYGINT_KERNEL_INTERRUPTS_DSRS
+    }
+
+    # NOTE: the choice of list vs table should not be two separate
+    # options. There is a single option which must have one of
+    # two legal values.
+    cdl_option CYGIMP_KERNEL_INTERRUPTS_DSRS_LIST {
+        display       "Use linked lists for DSRs"
+        default_value 1
+        implements    CYGINT_KERNEL_INTERRUPTS_DSRS
+        description   "
+            When DSR support is enabled the kernel must keep track of all
+            the DSRs that are pending. This information can be kept in a
+            fixed-size table or in a linked list. The list implementation
+            requires that the kernel disable interrupts for a very short
+            period of time outside interrupt handlers, but there is no
+            possibility of a table overflow occurring."
+    }
+
+    cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS_TABLE {
+        display       "Use fixed-size table for DSRs"
+        default_value 0
+        implements    CYGINT_KERNEL_INTERRUPTS_DSRS
+        description   "
+            When DSR support is enabled the kernel must keep track of all
+            the DSRs that are pending. This information can be kept in a
+            fixed-size table or in a linked list. The table
+            implementation involves a very small risk of overflow at
+            run-time if a given interrupt source is able to have more
+            than one pending DSR. However it has the advantage that
+            the kernel does not need to disable interrupts outside
+            interrupt handlers."
+
+        cdl_option CYGNUM_KERNEL_INTERRUPTS_DSRS_TABLE_SIZE {
+            display       "Number of entries in fixed-size DSR table"
+            flavor        data
+            legal_values  2 to 1024
+            default_value 32
+            description "
+            When DSR support is enabled the kernel must keep track of all
+            the DSRs that are pending. One approach involves a fixed-size
+            table, which involves a very small risk of overflow at
+            run-time. By increasing the table size it is possible to reduce
+            this risk."
+        }
+    }
+
+    cdl_option CYGIMP_KERNEL_INTERRUPTS_CHAIN {
+        display       "Chain all interrupts together"
+        requires      CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN
+        default_value 0
+        description "
+            Interrupts can be attached to vectors either singly, or be
+            chained together. The latter is necessary if there is no way
+            of discovering which device has interrupted without
+            inspecting the device itself. It can also reduce the amount
+            of RAM needed for interrupt decoding tables and code."
+    }
+}