1 files changed, 172 insertions, 0 deletions
diff --git a/nuttx/arch/mips/src/pic32mx/pic32mx-decodeirq.c b/nuttx/arch/mips/src/pic32mx/pic32mx-decodeirq.c
new file mode 100644
index 000000000..61ac69817
--- /dev/null
+++ b/nuttx/arch/mips/src/pic32mx/pic32mx-decodeirq.c
@@ -0,0 +1,172 @@
+/****************************************************************************
+ * arch/mips/src/pic32mx/pic32mx-decodeirq.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 <stdint.h>
+#include <assert.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+#include "os_internal.h"
+
+#include "pic32mx-int.h"
+#include "pic32mx-internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: pic32mx_decodeirq
+ *
+ * Description:
+ *   Called from assembly language logic when an interrrupt exception occurs.
+ *   This function decodes and dispatches the interrupt.
+ *
+ ****************************************************************************/
+
+uint32_t *pic32mx_decodeirq(uint32_t *regs)
+{
+#ifdef CONFIG_SUPPRESS_INTERRUPTS
+
+  up_ledon(LED_INIRQ);
+  PANIC(OSERR_ERREXCEPTION);
+  up_ledoff(LED_INIRQ); /* Won't get here */
+  return regs;
+
+#else
+  uint32_t *savestate;
+  uint32_t regval;
+  int irq;
+
+  /* If the board supports LEDs, turn on an LED now to indicate that we are
+   * processing an interrupt.
+   */
+
+  up_ledon(LED_INIRQ);
+
+  /* Save the current value of current_regs (to support nested interrupt
+   * handling).  Then set current_regs to regs, indicating that this is
+   * the interrupted context that is being processed now.
+   */
+
+  savestate    = (uint32_t*)current_regs;
+  current_regs = regs;
+
+  /* Loop while there are pending interrupts with priority greater than zero */
+
+  for (;;)
+    {
+      /* Read the INTSTAT register.  This register contains both the priority
+       * and the interrupt vector number.
+       */
+
+      regval = getreg32(PIC32MX_INT_INTSTAT);
+      if ((regval & INT_INTSTAT_RIPL_MASK) == 0)
+        {
+          /* Break out of the loop when the priority is zero meaning that
+           * there are no further pending interrupts.
+           */
+
+          break;
+        }
+
+      /* Get the vector number.  The IRQ numbers have been arranged so that
+       * vector numbers and NuttX IRQ numbers are the same value.
+       */
+
+      irq = ((regval) & INT_INTSTAT_VEC_MASK) >> INT_INTSTAT_VEC_SHIFT;
+      
+      /* Mask and acknowledge the interrupt */
+
+      up_maskack_irq(irq);
+
+      /* Deliver the IRQ */
+
+      irq_dispatch(irq, regs);
+
+      /* Unmask the last interrupt (global interrupt below the current interrupt
+       * level are are still disabled)
+       */
+
+      up_enable_irq(irq);
+    }
+
+  /* If a context switch occurred while processing the interrupt then
+   * current_regs may have change value.  If we return any value different
+   * from the input regs, then the lower level will know that a context
+   * switch occurred during interrupt processing.
+   */
+
+  regs = (uint32_t*)current_regs;
+
+  /* Restore the previous value of current_regs.  NULL would indicate that
+   * we are no longer in an interrupt handler.  It will be non-NULL if we
+   * are returning from a nested interrupt.
+   */
+
+  current_regs = savestate;
+  if (current_regs == NULL)
+    {
+      up_ledoff(LED_INIRQ);
+    }
+
+  return regs;
+#endif
+}