summaryrefslogtreecommitdiff
path: root/arch/avr32/include/asm/cmpxchg.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/avr32/include/asm/cmpxchg.h')
-rw-r--r--arch/avr32/include/asm/cmpxchg.h115
1 files changed, 0 insertions, 115 deletions
diff --git a/arch/avr32/include/asm/cmpxchg.h b/arch/avr32/include/asm/cmpxchg.h
deleted file mode 100644
index 572739b4c4b4..000000000000
--- a/arch/avr32/include/asm/cmpxchg.h
+++ /dev/null
@@ -1,115 +0,0 @@
-/*
- * Atomic operations that C can't guarantee us. Useful for
- * resource counting etc.
- *
- * But use these as seldom as possible since they are slower than
- * regular operations.
- *
- * Copyright (C) 2004-2006 Atmel Corporation
- *
- * 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_AVR32_CMPXCHG_H
-#define __ASM_AVR32_CMPXCHG_H
-
-#define xchg(ptr,x) \
- ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
-
-extern void __xchg_called_with_bad_pointer(void);
-
-static inline unsigned long xchg_u32(u32 val, volatile u32 *m)
-{
- u32 ret;
-
- asm volatile("xchg %[ret], %[m], %[val]"
- : [ret] "=&r"(ret), "=m"(*m)
- : "m"(*m), [m] "r"(m), [val] "r"(val)
- : "memory");
- return ret;
-}
-
-static inline unsigned long __xchg(unsigned long x,
- volatile void *ptr,
- int size)
-{
- switch(size) {
- case 4:
- return xchg_u32(x, ptr);
- default:
- __xchg_called_with_bad_pointer();
- return x;
- }
-}
-
-static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
- unsigned long new)
-{
- __u32 ret;
-
- asm volatile(
- "1: ssrf 5\n"
- " ld.w %[ret], %[m]\n"
- " cp.w %[ret], %[old]\n"
- " brne 2f\n"
- " stcond %[m], %[new]\n"
- " brne 1b\n"
- "2:\n"
- : [ret] "=&r"(ret), [m] "=m"(*m)
- : "m"(m), [old] "Ks21r"(old), [new] "r"(new)
- : "memory", "cc");
- return ret;
-}
-
-extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
- volatile int * m, unsigned long old, unsigned long new);
-#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
-
-/* This function doesn't exist, so you'll get a linker error
- if something tries to do an invalid cmpxchg(). */
-extern void __cmpxchg_called_with_bad_pointer(void);
-
-static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
- unsigned long new, int size)
-{
- switch (size) {
- case 4:
- return __cmpxchg_u32(ptr, old, new);
- case 8:
- return __cmpxchg_u64(ptr, old, new);
- }
-
- __cmpxchg_called_with_bad_pointer();
- return old;
-}
-
-#define cmpxchg(ptr, old, new) \
- ((typeof(*(ptr)))__cmpxchg((ptr), (unsigned long)(old), \
- (unsigned long)(new), \
- sizeof(*(ptr))))
-
-#include <asm-generic/cmpxchg-local.h>
-
-static inline unsigned long __cmpxchg_local(volatile void *ptr,
- unsigned long old,
- unsigned long new, int size)
-{
- switch (size) {
- case 4:
- return __cmpxchg_u32(ptr, old, new);
- default:
- return __cmpxchg_local_generic(ptr, old, new, size);
- }
-
- return old;
-}
-
-#define cmpxchg_local(ptr, old, new) \
- ((typeof(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(old), \
- (unsigned long)(new), \
- sizeof(*(ptr))))
-
-#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
-
-#endif /* __ASM_AVR32_CMPXCHG_H */