Changeset 6b781c0 in mainline for kernel/arch/arm32/include/atomic.h

Timestamp:

2007-06-08T15:02:49Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c03ee1c

Parents:

3ee8a075

Message:

Merge arm32 into trunk.

File:

• kernel/arch/arm32/include/atomic.h (modified) (4 diffs)

kernel/arch/arm32/include/atomic.h

@@ -1 +1 @@
 /*
- * Copyright (c) 2005 Ondrej Palkovsky
+ * Copyright (c) 2007 Michal Kebrt
  * All rights reserved.
  *
@@ -30 +30 @@
  * @{
  */
-/** @file
+/** @file 
+ *  @brief Atomic operations.
  */
 
@@ -36 +37 @@
 #define KERN_arm32_ATOMIC_H_
 
-#define atomic_inc(x)   ((void) atomic_add(x, 1))
-#define atomic_dec(x)   ((void) atomic_add(x, -1))
-
-#define atomic_postinc(x) (atomic_add(x, 1) - 1)
-#define atomic_postdec(x) (atomic_add(x, -1) + 1)
-
-#define atomic_preinc(x) atomic_add(x, 1)
-#define atomic_predec(x) atomic_add(x, -1)
-
-/* Atomic addition of immediate value.
+/** Atomic addition.
  *
- * @param val Memory location to which will be the immediate value added.
- * @param i Signed immediate that will be added to *val.
+ * @param val Where to add.
+ * @param i   Value to be added.
  *
  * @return Value after addition.
@@ -54 +46 @@
 static inline long atomic_add(atomic_t *val, int i)
 {
-        /* TODO */
-        return (val->count += i);
+        int ret;
+        volatile long *mem = &(val->count);
+
+        asm volatile (
+        "1:\n"
+                "ldr r2, [%1]       \n"
+                "add r3, r2, %2     \n"
+                "str r3, %0         \n"
+                "swp r3, r3, [%1]   \n"
+                "cmp r3, r2         \n"
+                "bne 1b             \n"
+
+                : "=m" (ret)
+                : "r" (mem), "r" (i)
+                : "r3", "r2"
+        );
+
+        return ret;
+}
+
+/** Atomic increment.
+ *
+ * @param val Variable to be incremented.
+ */
+static inline void atomic_inc(atomic_t *val)
+{
+        atomic_add(val, 1);
+}
+
+/** Atomic decrement.
+ *
+ * @param val Variable to be decremented.
+ */
+static inline void atomic_dec(atomic_t *val) {
+        atomic_add(val, -1);
+}
+
+/** Atomic pre-increment.
+ *
+ * @param val Variable to be incremented.
+ * @return    Value after incrementation.
+ */
+static inline long atomic_preinc(atomic_t *val)
+{
+        return atomic_add(val, 1);
+}
+
+/** Atomic pre-decrement.
+ *
+ * @param val Variable to be decremented.
+ * @return    Value after decrementation.
+ */
+static inline long atomic_predec(atomic_t *val)
+{
+        return atomic_add(val, -1);
+}
+
+/** Atomic post-increment.
+ *
+ * @param val Variable to be incremented.
+ * @return    Value before incrementation.
+ */
+static inline long atomic_postinc(atomic_t *val)
+{
+        return atomic_add(val, 1) - 1;
+}
+
+/** Atomic post-decrement.
+ *
+ * @param val Variable to be decremented.
+ * @return    Value before decrementation.
+ */
+static inline long atomic_postdec(atomic_t *val)
+{
+        return atomic_add(val, -1) + 1;
 }