From e01dfbc3923429a5fd9e5e7d417caa9a096a9862 Mon Sep 17 00:00:00 2001
From: fincs <fincs.alt1@gmail.com>
Date: Sat, 7 Nov 2015 01:07:11 +0100
Subject: [PATCH] synchronization.h: Add DSB & several atomic operations

---
 libctru/include/3ds/synchronization.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/libctru/include/3ds/synchronization.h b/libctru/include/3ds/synchronization.h
index c919757..c8703bc 100644
--- a/libctru/include/3ds/synchronization.h
+++ b/libctru/include/3ds/synchronization.h
@@ -15,6 +15,12 @@ typedef struct
 	u32 counter;    ///< Lock count.
 } RecursiveLock;
 
+/// Performs a Data Synchronization Barrier operation.
+static inline void __dsb(void)
+{
+	__asm__ __volatile__("mcr p15, 0, %[val], c7, c10, 4" :: [val] "r" (0) : "memory");
+}
+
 /// Performs a clrex operation.
 static inline void __clrex(void)
 {
@@ -46,6 +52,17 @@ static inline bool __strex(s32* addr, s32 val)
 	return res;
 }
 
+/// Performs an atomic pre-increment operation.
+#define AtomicIncrement(ptr) __atomic_add_fetch((u32*)(ptr), 1, __ATOMIC_SEQ_CST)
+/// Performs an atomic pre-decrement operation.
+#define AtomicDecrement(ptr) __atomic_sub_fetch((u32*)(ptr), 1, __ATOMIC_SEQ_CST)
+/// Performs an atomic post-increment operation.
+#define AtomicPostIncrement(ptr) __atomic_fetch_add((u32*)(ptr), 1, __ATOMIC_SEQ_CST)
+/// Performs an atomic post-decrement operation.
+#define AtomicPostDecrement(ptr) __atomic_fetch_sub((u32*)(ptr), 1, __ATOMIC_SEQ_CST)
+/// Performs an atomic swap operation.
+#define AtomicSwap(ptr, value) __atomic_exchange_n((u32*)(ptr), (value), __ATOMIC_SEQ_CST)
+
 /**
  * @brief Initializes a light lock.
  * @param lock Pointer to the lock.