1 files changed, 127 insertions, 0 deletions
diff --git a/nuttx/sched/irq_attach.c b/nuttx/sched/irq_attach.c
new file mode 100644
index 000000000..3f27a0530
--- /dev/null
+++ b/nuttx/sched/irq_attach.c
@@ -0,0 +1,127 @@
+/****************************************************************************
+ * sched/irq_attach.c
+ *
+ *   Copyright (C) 2007-2008, 2010, 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/irq.h>
+
+#include "irq_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: irq_attach
+ *
+ * Description:
+ *   Configure the IRQ subsystem so that IRQ number 'irq' is dispatched to
+ *   'isr'
+ *
+ ****************************************************************************/
+
+int irq_attach(int irq, xcpt_t isr)
+{
+#if NR_IRQS > 0
+  int ret = ERROR;
+
+  if ((unsigned)irq < NR_IRQS)
+    {
+      irqstate_t state;
+
+      /* If the new ISR is NULL, then the ISR is being detached.
+       * In this case, disable the ISR and direct any interrupts
+       * to the unexpected interrupt handler.
+       */
+
+      state = irqsave();
+      if (isr == NULL)
+        {
+          /* Disable the interrupt if we can before detaching it.  We might
+           * not be able to do this if:  (1) the device does not have a 
+           * centralized interrupt controller (so up_disable_irq() is not
+           * supported).  Or (2) if the device has different number for vector
+           * numbers and IRQ numbers (in that case, we don't know the correct
+           * IRQ number to use to disable the interrupt).  In those cases, the
+           * code will just need to be careful that it disables all interrupt
+           * sources before detaching from the interrupt vector.
+           */
+
+#if !defined(CONFIG_ARCH_NOINTC) && !defined(CONFIG_ARCH_VECNOTIRQ)
+          up_disable_irq(irq);
+#endif
+          /* Detaching the ISR really means re-attaching it to the
+           * unexpected exception handler.
+           */
+
+           isr = irq_unexpected_isr;
+        }
+
+      /* Save the new ISR in the table. */
+
+      g_irqvector[irq] = isr;
+      irqrestore(state);
+      ret = OK;
+    }
+
+  return ret;
+#else
+  return OK;
+#endif
+}