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-rw-r--r--arch/c6x/include/asm/cmpxchg.h68
1 files changed, 68 insertions, 0 deletions
diff --git a/arch/c6x/include/asm/cmpxchg.h b/arch/c6x/include/asm/cmpxchg.h
new file mode 100644
index 0000000..b27c8ce
--- /dev/null
+++ b/arch/c6x/include/asm/cmpxchg.h
@@ -0,0 +1,68 @@
+/*
+ * Port on Texas Instruments TMS320C6x architecture
+ *
+ * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
+ * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _ASM_C6X_CMPXCHG_H
+#define _ASM_C6X_CMPXCHG_H
+
+#include <linux/irqflags.h>
+
+/*
+ * Misc. functions
+ */
+static inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size)
+{
+ unsigned int tmp;
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ switch (size) {
+ case 1:
+ tmp = 0;
+ tmp = *((unsigned char *) ptr);
+ *((unsigned char *) ptr) = (unsigned char) x;
+ break;
+ case 2:
+ tmp = 0;
+ tmp = *((unsigned short *) ptr);
+ *((unsigned short *) ptr) = x;
+ break;
+ case 4:
+ tmp = 0;
+ tmp = *((unsigned int *) ptr);
+ *((unsigned int *) ptr) = x;
+ break;
+ }
+ local_irq_restore(flags);
+ return tmp;
+}
+
+#define xchg(ptr, x) \
+ ((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \
+ sizeof(*(ptr))))
+#define tas(ptr) xchg((ptr), 1)
+
+
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n) \
+ ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \
+ (unsigned long)(o), \
+ (unsigned long)(n), \
+ sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
+#include <asm-generic/cmpxchg.h>
+
+#endif /* _ASM_C6X_CMPXCHG_H */