2010-04-30 Sebastian Huber <sebastian.huber@embedded-brains.de>

* include/irq-config.h: Removed file.
	* include/irq.h: New file (renamed from 'include/irq-config.h').
	* include/irq-generic.h, src/irq-info.c: Include <bsp/irq.h> instead
	of <bsp/irq-config.h>.
	* src/irq-server.c: Use events instead of semaphore.  Added error
	counter for multiple chain appends.  Added error counter to detect
	erroneous interrupt events.

c/src/lib/libbsp/shared/ChangeLog

@@ -1,3 +1,13 @@
+2010-04-30	Sebastian Huber <sebastian.huber@embedded-brains.de>
+
+	* include/irq-config.h: Removed file.
+	* include/irq.h: New file (renamed from 'include/irq-config.h').
+	* include/irq-generic.h, src/irq-info.c: Include <bsp/irq.h> instead
+	of <bsp/irq-config.h>.
+	* src/irq-server.c: Use events instead of semaphore.  Added error
+	counter for multiple chain appends.  Added error counter to detect
+	erroneous interrupt events.
+
 2010-04-30	Sebastian Huber <sebastian.huber@embedded-brains.de>
 
 	* include/bootcard.h: Documentation.

c/src/lib/libbsp/shared/include/irq-generic.h

@@ -9,7 +9,7 @@
 /*
  * Based on concepts of Pavel Pisa, Till Straumann and Eric Valette.
  *
- * Copyright (c) 2008, 2009
+ * Copyright (c) 2008, 2009, 2010
  * embedded brains GmbH
  * Obere Lagerstr. 30
  * D-82178 Puchheim
@@ -28,7 +28,7 @@
 
 #include <rtems/irq-extension.h>
 
-#include <bsp/irq-config.h>
+#include <bsp/irq.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -86,30 +86,30 @@ static inline rtems_vector_number bsp_interrupt_handler_index(
  *
  * The BSP interrupt support manages a sequence of interrupt vector numbers
  * ranging from @ref BSP_INTERRUPT_VECTOR_MIN to @ref BSP_INTERRUPT_VECTOR_MAX
- * including the end points.  It provides methods to @ref
- * bsp_interrupt_handler_install() "install", @ref
- * bsp_interrupt_handler_remove() "remove" and @ref
- * bsp_interrupt_handler_dispatch() "dispatch" interrupt handlers for each
+ * including the end points.  It provides methods to
+ * @ref bsp_interrupt_handler_install() "install",
+ * @ref bsp_interrupt_handler_remove() "remove" and
+ * @ref bsp_interrupt_handler_dispatch() "dispatch" interrupt handlers for each
  * vector number.  It implements parts of the RTEMS interrupt manager.
  *
  * The entry points to a list of interrupt handlers are stored in a table
  * (= handler table).
  *
- * You have to configure the BSP interrupt support in the bsp/irq-config.h file
- * for each BSP.  For a minimum configuration you have to provide @ref
- * BSP_INTERRUPT_VECTOR_MIN and @ref BSP_INTERRUPT_VECTOR_MAX.
+ * You have to configure the BSP interrupt support in the <bsp/irq.h> file
+ * for each BSP.  For a minimum configuration you have to provide
+ * @ref BSP_INTERRUPT_VECTOR_MIN and @ref BSP_INTERRUPT_VECTOR_MAX.
  *
- * For boards with small memory requirements you can define @ref
- * BSP_INTERRUPT_USE_INDEX_TABLE.  With an enabled index table the handler
+ * For boards with small memory requirements you can define
+ * @ref BSP_INTERRUPT_USE_INDEX_TABLE.  With an enabled index table the handler
  * table will be accessed via a small index table.  You can define the size of
  * the handler table with @ref BSP_INTERRUPT_HANDLER_TABLE_SIZE.  You must
- * provide a data type for the index table (@ref
- * bsp_interrupt_handler_index_type).  It must be an integer type big enough to
- * index the complete handler table.
+ * provide a data type for the index table
+ * (@ref bsp_interrupt_handler_index_type).  It must be an integer type big
+ * enough to index the complete handler table.
  *
- * Normally new list entries are allocated from the heap.  You may define @ref
- * BSP_INTERRUPT_NO_HEAP_USAGE, if you do not want to use the heap.  For this
- * option you have to define @ref BSP_INTERRUPT_USE_INDEX_TABLE as well.
+ * Normally new list entries are allocated from the heap.  You may define
+ * @ref BSP_INTERRUPT_NO_HEAP_USAGE, if you do not want to use the heap.  For
+ * this option you have to define @ref BSP_INTERRUPT_USE_INDEX_TABLE as well.
  *
  * You have to provide some special routines in your BSP (follow the links for
  * the details):
@@ -182,9 +182,9 @@ rtems_status_code bsp_interrupt_facility_initialize(void);
  *
  * This function shall enable the vector at the corresponding facility (in most
  * cases the interrupt controller).  It will be called then the first handler
- * is installed for the vector in bsp_interrupt_handler_install().  For a
- * vector out of range this function shall do nothing except returning
- * RTEMS_SUCCESSFUL.
+ * is installed for the vector in bsp_interrupt_handler_install().  It is
+ * guaranteed that the vector number is within the BSP_INTERRUPT_VECTOR_MIN and
+ * BSP_INTERRUPT_VECTOR_MAX range.
  *
  * @note You must not install or remove an interrupt handler in this function.
  * This may result in a deadlock.
@@ -198,9 +198,9 @@ rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector);
  *
  * This function shall disable the vector at the corresponding facility (in
  * most cases the interrupt controller).  It will be called then the last
- * handler is removed for the vector in bsp_interrupt_handler_remove().  For a
- * vector out of range this function shall do nothing except returning
- * RTEMS_SUCCESSFUL.
+ * handler is removed for the vector in bsp_interrupt_handler_remove().  It is
+ * guaranteed that the vector number is within the BSP_INTERRUPT_VECTOR_MIN and
+ * BSP_INTERRUPT_VECTOR_MAX range.
  *
  * @note You must not install or remove an interrupt handler in this function.
  * This may result in a deadlock.

c/src/lib/libbsp/shared/include/irq.h

@@ -9,7 +9,7 @@
 /*
  * Based on concepts of Pavel Pisa, Till Straumann and Eric Valette.
  *
- * Copyright (c) 2008, 2009
+ * Copyright (c) 2008, 2009, 2010
  * embedded brains GmbH
  * Obere Lagerstr. 30
  * D-82178 Puchheim

c/src/lib/libbsp/shared/src/irq-info.c

@@ -7,7 +7,7 @@
  */
 
 /*
- * Copyright (c) 2008, 2009
+ * Copyright (c) 2008, 2009, 2010
  * embedded brains GmbH
  * Obere Lagerstr. 30
  * D-82178 Puchheim
@@ -21,11 +21,8 @@
 
 #include <inttypes.h>
 
-#include <rtems/irq.h>
-
 #include <bsp/irq-generic.h>
 #include <bsp/irq-info.h>
-#include <bsp/irq-config.h>
 
 typedef struct {
   void *context;

c/src/lib/libbsp/shared/src/irq-server.c

@@ -7,7 +7,7 @@
  */
 
 /*
- * Copyright (c) 2009
+ * Copyright (c) 2009, 2010
  * embedded brains GmbH
  * Obere Lagerstr. 30
  * D-82178 Puchheim
@@ -21,69 +21,90 @@
 
 #include <stdlib.h>
 
+#include <rtems.h>
+#include <rtems/chain.h>
+
 #include <bsp/irq-generic.h>
 
+#define BSP_INTERRUPT_EVENT RTEMS_EVENT_13
+
 typedef struct bsp_interrupt_server_entry {
+  rtems_chain_node node;
   rtems_vector_number vector;
   rtems_interrupt_handler handler;
   void *arg;
-  struct bsp_interrupt_server_entry *volatile next;
 } bsp_interrupt_server_entry;
 
-static rtems_id bsp_interrupt_server_semaphore = RTEMS_ID_NONE;
+static rtems_id bsp_interrupt_server_id = RTEMS_ID_NONE;
 
-/* LIFO list head */
-static bsp_interrupt_server_entry *volatile
-bsp_interrupt_server_list_head = NULL;
+static RTEMS_CHAIN_DEFINE_EMPTY(bsp_interrupt_server_chain);
 
 static rtems_status_code bsp_interrupt_server_is_initialized(void)
 {
-  if (bsp_interrupt_server_semaphore != RTEMS_ID_NONE) {
+  if (bsp_interrupt_server_id != RTEMS_ID_NONE) {
     return RTEMS_SUCCESSFUL;
   } else {
     return RTEMS_INCORRECT_STATE;
   }
 }
 
+static unsigned bsp_interrupt_server_errors;
+
 static void bsp_interrupt_server_trigger(void *arg)
 {
   bsp_interrupt_server_entry *e = arg;
-  rtems_interrupt_level level;
 
   bsp_interrupt_vector_disable(e->vector);
 
-  /* Add interrupt server entry to the list */
+  if (e->node.next == NULL) {
+    rtems_chain_append(&bsp_interrupt_server_chain, &e->node);
+  } else {
+    ++bsp_interrupt_server_errors;
+  }
+
+  rtems_event_send(bsp_interrupt_server_id, BSP_INTERRUPT_EVENT);
+}
+
+static bsp_interrupt_server_entry *bsp_interrupt_server_get_entry(void)
+{
+  rtems_interrupt_level level;
+  bsp_interrupt_server_entry *e;
+
   rtems_interrupt_disable(level);
-  e->next = bsp_interrupt_server_list_head;
-  bsp_interrupt_server_list_head = e;
+  e = (bsp_interrupt_server_entry *)
+    rtems_chain_get_unprotected(&bsp_interrupt_server_chain);
+  if (e != NULL) {
+    e->node.next = NULL;
+  }
   rtems_interrupt_enable(level);
 
-  rtems_semaphore_release(bsp_interrupt_server_semaphore);
+  return e;
 }
 
 static void bsp_interrupt_server_task(rtems_task_argument arg)
 {
   rtems_status_code sc = RTEMS_SUCCESSFUL;
-  rtems_id sema = bsp_interrupt_server_semaphore;
-  rtems_interrupt_level level;
-  bsp_interrupt_server_entry *e = NULL;
 
   while (true) {
-    sc = rtems_semaphore_obtain(sema, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
+    rtems_event_set events = 0;
+    bsp_interrupt_server_entry *e = NULL;
+
+    sc = rtems_event_receive(
+      BSP_INTERRUPT_EVENT,
+      RTEMS_EVENT_ALL | RTEMS_WAIT,
+      RTEMS_NO_TIMEOUT,
+      &events
+    );
     if (sc != RTEMS_SUCCESSFUL) {
       break;
     }
 
-    /* Fetch next interrupt server entry from the list */
-    rtems_interrupt_disable(level);
-    e = bsp_interrupt_server_list_head;
-    bsp_interrupt_server_list_head = e->next;
-    rtems_interrupt_enable(level);
-
+    while ((e = bsp_interrupt_server_get_entry()) != NULL) {
       (*e->handler)(e->arg);
 
       bsp_interrupt_vector_enable(e->vector);
     }
+  }
 
   rtems_task_delete(RTEMS_SELF);
 }
@@ -137,7 +158,7 @@ rtems_status_code rtems_interrupt_server_handler_install(
     return RTEMS_NOT_IMPLEMENTED;
   }
 
-  e = malloc(sizeof(bsp_interrupt_server_entry));
+  e = calloc(1, sizeof(*e));
   if (e == NULL) {
     return RTEMS_NO_MEMORY;
   }
@@ -220,67 +241,34 @@ rtems_status_code rtems_interrupt_server_initialize(
 )
 {
   rtems_status_code sc = RTEMS_SUCCESSFUL;
-  rtems_id sema_id = RTEMS_ID_NONE;
-  rtems_id task_id = RTEMS_ID_NONE;
-  rtems_interrupt_level level;
 
   if (server != NULL) {
     return RTEMS_NOT_IMPLEMENTED;
   }
 
-  sc = rtems_semaphore_create(
-    rtems_build_name('I', 'R', 'Q', 'S'),
-    0,
-    RTEMS_LOCAL | RTEMS_FIFO | RTEMS_COUNTING_SEMAPHORE,
-    0,
-    &sema_id
-  );
-  if (sc != RTEMS_SUCCESSFUL) {
-    return sc;
-  }
-
   sc = rtems_task_create(
     rtems_build_name('I', 'R', 'Q', 'S'),
     priority,
     stack_size,
     modes,
     attributes,
-    &task_id
+    &bsp_interrupt_server_id
   );
   if (sc != RTEMS_SUCCESSFUL) {
-    rtems_semaphore_delete(sema_id);
-
-    return sc;
-  }
-
-  /* Initialize global data (this must be done before the task starts) */
-  rtems_interrupt_disable(level);
-  if (bsp_interrupt_server_semaphore == RTEMS_ID_NONE) {
-    bsp_interrupt_server_semaphore = sema_id;
-    sc = RTEMS_SUCCESSFUL;
-  } else {
-    sc = RTEMS_INCORRECT_STATE;
-  }
-  rtems_interrupt_enable(level);
-  if (sc != RTEMS_SUCCESSFUL) {
-    rtems_semaphore_delete(sema_id);
-    rtems_task_delete(task_id);
-
-    return sc;
+    return RTEMS_TOO_MANY;
   }
 
   sc = rtems_task_start(
-    task_id,
+    bsp_interrupt_server_id,
     bsp_interrupt_server_task,
     0
   );
   if (sc != RTEMS_SUCCESSFUL) {
     /* In this case we could also panic */
-    bsp_interrupt_server_semaphore = RTEMS_ID_NONE;
-    rtems_semaphore_delete(sema_id);
-    rtems_task_delete(task_id);
+    rtems_task_delete(bsp_interrupt_server_id);
+    bsp_interrupt_server_id = RTEMS_ID_NONE;
 
-    return sc;
+    return RTEMS_TOO_MANY;
   }
 
   return RTEMS_SUCCESSFUL;