增加所有文件

arch/include/armv7-r/spinlock.h

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+/*
+ * spinlock.h
+ *
+ * Copyright (c) 2020 Semidrive Semiconductor.
+ * All rights reserved.
+ *
+ * Description: ARM spinlock interface.
+ *
+ * Revision History:
+ * -----------------
+ */
+
+#ifndef INCLUDE_ARM_SPINLOCK_H
+#define INCLUDE_ARM_SPINLOCK_H
+
+#include <armv7-r/barriers.h>
+
+#define SPIN_LOCK_INITIAL_VALUE (0)
+
+#ifndef ASSEMBLY
+
+__BEGIN_CDECLS
+
+/* spin lock type */
+typedef unsigned long spin_lock_t;
+
+#ifdef CONFIG_MULTI_CORE_SMP
+#else
+static inline int __arch_spin_lock_testset(spin_lock_t *spinlock, int value)
+{
+    int result = 0;
+
+    __ASM volatile
+    (
+        "1:\n"
+        "\tldrex %0, [%1]\n"
+        "\tcmp %0, %2\n"
+        "\tbeq 2f\n"
+        "\tstrex %0, %2, [%1]\n"
+        "\tcmp %0, %2\n"
+        "\tbeq 1b\n"
+        "\tdmb ish\n"
+        "2:\n"
+        : "=&r" (result)
+        : "r" (spinlock), "r" (value)
+        : "cc", "memory"
+    );
+
+    return result;
+}
+#endif
+
+/*
+ * arch spinlock init.
+ *
+ * @spinlock    spinlock address.
+ */
+#ifdef CONFIG_MULTI_CORE_SMP
+void arch_spin_lock_init(spin_lock_t *spinlock);
+#else
+static inline void arch_spin_lock_init(spin_lock_t *spinlock)
+{
+    *spinlock = SPIN_LOCK_INITIAL_VALUE;
+}
+#endif
+
+/*
+ * arch spin lock.
+ *
+ * @spinlock    spinlock address.
+ */
+#ifdef CONFIG_MULTI_CORE_SMP
+void arch_spin_lock(spin_lock_t *spinlock);
+#else
+static inline void arch_spin_lock(spin_lock_t *spinlock)
+{
+    /* spin until lock is acquired */
+    while (__arch_spin_lock_testset(spinlock, 1)) {
+        DSB;
+    };
+}
+#endif
+
+/*
+ * arch spin trylock.
+ *
+ * @spinlock    spinlock address.
+ */
+#ifdef CONFIG_MULTI_CORE_SMP
+int arch_spin_trylock(spin_lock_t *spinlock);
+#else
+static inline int arch_spin_trylock(spin_lock_t *spinlock)
+{
+    return __arch_spin_lock_testset(spinlock, 1) == 0;
+}
+#endif
+
+/*
+ * arch spin unlock.
+ *
+ * @spinlock    spinlock address.
+ */
+#ifdef CONFIG_MULTI_CORE_SMP
+void arch_spin_unlock(spin_lock_t *spinlock);
+#else
+static inline void arch_spin_unlock(spin_lock_t *spinlock)
+{
+    DMB;
+    *spinlock = 0;
+    DSB;
+}
+#endif
+
+__END_CDECLS
+
+#endif
+
+#endif