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authorPaul Mundt <lethal@linux-sh.org>2006-12-07 20:33:38 +0900
committerPaul Mundt <lethal@linux-sh.org>2006-12-12 08:42:08 +0900
commitec723fbe7e19f5a66cea183bca7ca20675631a7a (patch)
tree2a716c86a4ba9924459c9e6436a31b1acb62d449 /include/asm-sh/atomic-irq.h
parenta45e724ba07c02bcf3da96ddc4efefbfe10957f5 (diff)
sh: Split out atomic ops logically.
We have a few different ways to do the atomic operations, so split them out in to different headers rather than bloating atomic.h. Kernelspace gUSA will take this up to a third implementation. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'include/asm-sh/atomic-irq.h')
-rw-r--r--include/asm-sh/atomic-irq.h71
1 files changed, 71 insertions, 0 deletions
diff --git a/include/asm-sh/atomic-irq.h b/include/asm-sh/atomic-irq.h
new file mode 100644
index 000000000000..74f7943cff6f
--- /dev/null
+++ b/include/asm-sh/atomic-irq.h
@@ -0,0 +1,71 @@
+#ifndef __ASM_SH_ATOMIC_IRQ_H
+#define __ASM_SH_ATOMIC_IRQ_H
+
+/*
+ * To get proper branch prediction for the main line, we must branch
+ * forward to code at the end of this object's .text section, then
+ * branch back to restart the operation.
+ */
+static inline void atomic_add(int i, atomic_t *v)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ *(long *)v += i;
+ local_irq_restore(flags);
+}
+
+static inline void atomic_sub(int i, atomic_t *v)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ *(long *)v -= i;
+ local_irq_restore(flags);
+}
+
+static inline int atomic_add_return(int i, atomic_t *v)
+{
+ unsigned long temp, flags;
+
+ local_irq_save(flags);
+ temp = *(long *)v;
+ temp += i;
+ *(long *)v = temp;
+ local_irq_restore(flags);
+
+ return temp;
+}
+
+static inline int atomic_sub_return(int i, atomic_t *v)
+{
+ unsigned long temp, flags;
+
+ local_irq_save(flags);
+ temp = *(long *)v;
+ temp -= i;
+ *(long *)v = temp;
+ local_irq_restore(flags);
+
+ return temp;
+}
+
+static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ *(long *)v &= ~mask;
+ local_irq_restore(flags);
+}
+
+static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ *(long *)v |= mask;
+ local_irq_restore(flags);
+}
+
+#endif /* __ASM_SH_ATOMIC_IRQ_H */