Forgot to add a file before the last commit

2016-10-19 10:06:07 -06:00 · 2016-10-19 10:06:07 -06:00 · 31d5acc8a7
commit 31d5acc8a7
parent 29c3acdc4e
1 changed files with 99 additions and 0 deletions
--- a/arch/xtensa/include/spinlock.h
+++ b/arch/xtensa/include/spinlock.h
@ -0,0 +1,99 @@
+/****************************************************************************
+ * arch/xtensa/include/spinlock.h
+ *
+ *   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.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_INCLUDE_SPINLOCK_H
+#define __ARCH_ARM_INCLUDE_SPINLOCK_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+#  include <stdint.h>
+#endif /* __ASSEMBLY__ */
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define SP_UNLOCKED 0  /* The Un-locked state */
+#define SP_LOCKED   1  /* The Locked state */
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/* The Type of a spinlock.
+ *
+ * This must be a uint32_ becaue it will be set using S32C1I instruction.
+ * That instruction atomically stores to a memory location only if its
+ * current value is the expected one.  The state register (SCOMPARE1) is
+ * used to provide the additional comparison operand. Some implementations
+ * also have a state register (ATOMCTL) for further control of the atomic
+ * operation in cache and on the PIF bus.
+ */
+
+typedef uint32_t spinlock_t;
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_testset
+ *
+ * Description:
+ *   Perform an atomic test and set operation on the provided spinlock.
+ *
+ *   This function must be provided via the architecture-specific logoic.
+ *
+ * Input Parameters:
+ *   lock - The address of spinlock object.
+ *
+ * Returned Value:
+ *   The spinlock is always locked upon return.  The value of previous value
+ *   of the spinlock variable is returned, either SP_LOCKED if the spinlock
+ *   as previously locked (meaning that the test-and-set operation failed to
+ *   obtain the lock) or SP_UNLOCKED if the spinlock was previously unlocked
+ *   (meaning that we successfully obtained the lock)
+ *
+ ****************************************************************************/
+
+/* See prototype in nuttx/include/nuttx/spinlock.h */
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_ARM_INCLUDE_SPINLOCK_H */