From 520513f456dcb9b5e0918d02f678f0d95c6176ff Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Thu, 20 Oct 2016 14:34:51 -0600
Subject: [PATCH] Xtensa: Add interrupt decode framework

---
 arch/xtensa/src/common/xtensa_intdecode.c | 69 +++++++++++++++++++++++
 arch/xtensa/src/esp32/Make.defs           |  8 +--
 2 files changed, 73 insertions(+), 4 deletions(-)
 create mode 100644 arch/xtensa/src/common/xtensa_intdecode.c

diff --git a/arch/xtensa/src/common/xtensa_intdecode.c b/arch/xtensa/src/common/xtensa_intdecode.c
new file mode 100644
index 00000000000..c170732f6ba
--- /dev/null
+++ b/arch/xtensa/src/common/xtensa_intdecode.c
@@ -0,0 +1,69 @@
+/****************************************************************************
+ * arch/xtensa/src/common/xtensa_intdecode.c
+ *
+ *   Copyright (C) 2016 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 "xtensa.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: xtensa_intdecode
+ *
+ * Description:
+ *   Determine the peripheral that geneated the interrupt and dispatch
+ *   handling to the registered interrupt handler via irq_dispatch().
+ *
+ * Input Parameters:
+ *   regs - Saves processor state on the stack
+ *
+ * Returned Value:
+ *   Normally the same vale as regs is returned.  But, in the event of an
+ *   interrupt level context switch, the returned value will, instead point
+ *   to the saved processor state in the TCB of the newly started task.
+ *
+ ****************************************************************************/
+
+uint32_t xtensa_intdecode(uint32_t *regs)
+{
+#warning Missing implementation
+  return regs;
+}
diff --git a/arch/xtensa/src/esp32/Make.defs b/arch/xtensa/src/esp32/Make.defs
index 1954962fdcb..c9570489206 100644
--- a/arch/xtensa/src/esp32/Make.defs
+++ b/arch/xtensa/src/esp32/Make.defs
@@ -44,10 +44,10 @@ CMN_ASRCS  = xtensa_context.S xtensa_irq.S xtensa_intvectors.S
 CMN_CSRCS  = xtensa_assert.c xtensa_copystate.c
 CMN_CSRCS += xtensa_createstack.c xtensa_exit.c xtensa_idle.c 
 CMN_CSRCS += xtensa_initialize.c xtensa_initialstate.c
-CMN_CSRCS += xtensa_interruptcontext.c xtensa_lowputs.c xtensa_mdelay.c
-CMN_CSRCS += xtensa_modifyreg8.c xtensa_modifyreg16.c xtensa_modifyreg32.c
-CMN_CSRCS += xtensa_puts.c xtensa_releasestack.c xtensa_stackframe.c
-CMN_CSRCS += xtensa_udelay.c xtensa_usestack.c
+CMN_CSRCS += xtensa_interruptcontext.c xtensa_intdecode.c xtensa_lowputs.c
+CMN_CSRCS += xtensa_mdelay.c xtensa_modifyreg8.c xtensa_modifyreg16.c
+CMN_CSRCS += xtensa_modifyreg32.c xtensa_puts.c xtensa_releasestack.c
+CMN_CSRCS += xtensa_stackframe.c xtensa_udelay.c xtensa_usestack.c
 
 # Configuration-dependent common XTENSA files