[rtems commit] Add interrupt server move

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    ccc87c8b9ed61d2bcf01c5721a0336a611be970e
Changeset: http://git.rtems.org/rtems/commit/?id=ccc87c8b9ed61d2bcf01c5721a0336a611be970e

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Tue Jul 11 11:20:06 2017 +0200

Add interrupt server move

Update #3071.

---

 c/src/lib/libbsp/shared/src/irq-server.c | 75 ++++++++++++++++++++++++++++++++
 cpukit/include/rtems/irq-extension.h     | 26 +++++++++++
 2 files changed, 101 insertions(+)

diff --git a/c/src/lib/libbsp/shared/src/irq-server.c b/c/src/lib/libbsp/shared/src/irq-server.c
index 61d3175..a7b277c 100644
--- a/c/src/lib/libbsp/shared/src/irq-server.c
+++ b/c/src/lib/libbsp/shared/src/irq-server.c
@@ -694,6 +694,81 @@ rtems_status_code rtems_interrupt_server_request_initialize(
   return RTEMS_SUCCESSFUL;
 }
 
+static void bsp_interrupt_server_handler_move_helper(void *arg)
+{
+  bsp_interrupt_server_helper_data *hd = arg;
+  bsp_interrupt_server_handler_iterate_helper_data *hihd = hd->arg;
+  rtems_interrupt_server_entry *e;
+  rtems_option trigger_options;
+
+  bsp_interrupt_lock();
+
+  e = bsp_interrupt_server_query_entry(hd->vector, &trigger_options);
+  if (e != NULL) {
+    rtems_interrupt_lock_context lock_context;
+    bsp_interrupt_server_context *src = e->server;
+    bsp_interrupt_server_context *dst = hihd->arg;
+    bool pending;
+
+    rtems_interrupt_lock_acquire(&src->lock, &lock_context);
+
+    pending = !rtems_chain_is_node_off_chain(&e->node);
+    if (pending) {
+      rtems_chain_extract_unprotected(&e->node);
+      rtems_chain_set_off_chain(&e->node);
+    }
+
+    rtems_interrupt_lock_release(&src->lock, &lock_context);
+
+    e->server = dst;
+
+    if (pending) {
+      bsp_interrupt_server_trigger(e);
+    }
+  }
+
+  bsp_interrupt_unlock();
+
+  rtems_event_transient_send(hd->task);
+}
+
+rtems_status_code rtems_interrupt_server_move(
+  uint32_t source_server_index,
+  rtems_vector_number vector,
+  uint32_t destination_server_index
+)
+{
+  rtems_status_code sc;
+  bsp_interrupt_server_context *src;
+  bsp_interrupt_server_context *dst;
+  bsp_interrupt_server_handler_iterate_helper_data hihd;
+
+  src = bsp_interrupt_server_get_context(source_server_index, &sc);
+  if (src == NULL) {
+    return sc;
+  }
+
+  dst = bsp_interrupt_server_get_context(destination_server_index, &sc);
+  if (dst == NULL) {
+    return sc;
+  }
+
+  if (!bsp_interrupt_is_valid_vector(vector)) {
+    return RTEMS_INVALID_ID;
+  }
+
+  hihd.arg = dst;
+  bsp_interrupt_server_call_helper(
+    src,
+    vector,
+    0,
+    NULL,
+    &hihd,
+    bsp_interrupt_server_handler_move_helper
+  );
+  return RTEMS_SUCCESSFUL;
+}
+
 static void bsp_interrupt_server_entry_suspend_helper(void *arg)
 {
   bsp_interrupt_server_helper_data *hd = arg;
diff --git a/cpukit/include/rtems/irq-extension.h b/cpukit/include/rtems/irq-extension.h
index 9cade11..e3fb4c5 100644
--- a/cpukit/include/rtems/irq-extension.h
+++ b/cpukit/include/rtems/irq-extension.h
@@ -362,6 +362,32 @@ rtems_status_code rtems_interrupt_server_handler_iterate(
 );
 
 /**
+ * @brief Moves the interrupt handlers installed on the specified source
+ * interrupt server to the destination interrupt server.
+ *
+ * This function must be called from thread context.  It may block.  Calling
+ * this function within the context of an interrupt server is undefined
+ * behaviour.
+ *
+ * @param[in] source_server_index The source interrupt server index.  Use
+ *   @c RTEMS_INTERRUPT_SERVER_DEFAULT to specify the default server.
+ * @param[in] vector The interrupt vector number.
+ * @param[in] destination_server_index The destination interrupt server index.
+ *   Use @c RTEMS_INTERRUPT_SERVER_DEFAULT to specify the default server.
+ *
+ * @retval RTEMS_SUCCESSFUL Successful operation
+ * @retval RTEMS_INCORRECT_STATE The interrupt servers are not initialized.
+ * @retval RTEMS_INVALID_ID The destination interrupt server index is invalid.
+ * @retval RTEMS_INVALID_ID The vector number is invalid.
+ * @retval RTEMS_INVALID_ID The destination interrupt server index is invalid.
+ */
+rtems_status_code rtems_interrupt_server_move(
+  uint32_t            source_server_index,
+  rtems_vector_number vector,
+  uint32_t            destination_server_index
+);
+
+/**
  * @brief Suspends the specified interrupt server.
  *
  * A suspend request is sent to the specified interrupt server.  This function