| Ley Foon Tan | 97da0d6 | 2014-11-06 15:20:09 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2004 Microtronix Datacom Ltd. |
| 3 | * |
| 4 | * This file is subject to the terms and conditions of the GNU General Public |
| 5 | * License. See the file "COPYING" in the main directory of this archive |
| 6 | * for more details. |
| 7 | */ |
| 8 | |
| 9 | #ifndef _ASM_NIOS2_CMPXCHG_H |
| 10 | #define _ASM_NIOS2_CMPXCHG_H |
| 11 | |
| 12 | #include <linux/irqflags.h> |
| 13 | |
| 14 | #define xchg(ptr, x) \ |
| 15 | ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))) |
| 16 | |
| 17 | struct __xchg_dummy { unsigned long a[100]; }; |
| 18 | #define __xg(x) ((volatile struct __xchg_dummy *)(x)) |
| 19 | |
| 20 | static inline unsigned long __xchg(unsigned long x, volatile void *ptr, |
| 21 | int size) |
| 22 | { |
| 23 | unsigned long tmp, flags; |
| 24 | |
| 25 | local_irq_save(flags); |
| 26 | |
| 27 | switch (size) { |
| 28 | case 1: |
| 29 | __asm__ __volatile__( |
| 30 | "ldb %0, %2\n" |
| 31 | "stb %1, %2\n" |
| 32 | : "=&r" (tmp) |
| 33 | : "r" (x), "m" (*__xg(ptr)) |
| 34 | : "memory"); |
| 35 | break; |
| 36 | case 2: |
| 37 | __asm__ __volatile__( |
| 38 | "ldh %0, %2\n" |
| 39 | "sth %1, %2\n" |
| 40 | : "=&r" (tmp) |
| 41 | : "r" (x), "m" (*__xg(ptr)) |
| 42 | : "memory"); |
| 43 | break; |
| 44 | case 4: |
| 45 | __asm__ __volatile__( |
| 46 | "ldw %0, %2\n" |
| 47 | "stw %1, %2\n" |
| 48 | : "=&r" (tmp) |
| 49 | : "r" (x), "m" (*__xg(ptr)) |
| 50 | : "memory"); |
| 51 | break; |
| 52 | } |
| 53 | |
| 54 | local_irq_restore(flags); |
| 55 | return tmp; |
| 56 | } |
| 57 | |
| 58 | #include <asm-generic/cmpxchg.h> |
| 59 | #include <asm-generic/cmpxchg-local.h> |
| 60 | |
| 61 | #endif /* _ASM_NIOS2_CMPXCHG_H */ |