projects / thirdparty / kernel / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| d2a5f499 YS |
2 | #ifndef __ARCH_H8300_CMPXCHG__ |
| 3 | #define __ARCH_H8300_CMPXCHG__ | |
| 4 | ||
| 5 | #include <linux/irqflags.h> | |
| 6 | ||
| 7 | #define xchg(ptr, x) \ | |
| 8 | ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \ | |
| 9 | sizeof(*(ptr)))) | |
| 10 | ||
| 11 | struct __xchg_dummy { unsigned long a[100]; }; | |
| 12 | #define __xg(x) ((volatile struct __xchg_dummy *)(x)) | |
| 13 | ||
| 14 | static inline unsigned long __xchg(unsigned long x, | |
| 15 | volatile void *ptr, int size) | |
| 16 | { | |
| 17 | unsigned long tmp, flags; | |
| 18 | ||
| 19 | local_irq_save(flags); | |
| 20 | ||
| 21 | switch (size) { | |
| 22 | case 1: | |
| 23 | __asm__ __volatile__ | |
| 24 | ("mov.b %2,%0\n\t" | |
| 25 | "mov.b %1,%2" | |
| 26 | : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); | |
| 27 | break; | |
| 28 | case 2: | |
| 29 | __asm__ __volatile__ | |
| 30 | ("mov.w %2,%0\n\t" | |
| 31 | "mov.w %1,%2" | |
| 32 | : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); | |
| 33 | break; | |
| 34 | case 4: | |
| 35 | __asm__ __volatile__ | |
| 36 | ("mov.l %2,%0\n\t" | |
| 37 | "mov.l %1,%2" | |
| 38 | : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); | |
| 39 | break; | |
| 40 | default: | |
| 41 | tmp = 0; | |
| 42 | } | |
| 43 | local_irq_restore(flags); | |
| 44 | return tmp; | |
| 45 | } | |
| 46 | ||
| 47 | #include <asm-generic/cmpxchg-local.h> | |
| 48 | ||
| 49 | /* | |
| 50 | * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make | |
| 51 | * them available. | |
| 52 | */ | |
| 53 | #define cmpxchg_local(ptr, o, n) \ | |
| 54 | ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \ | |
| 55 | (unsigned long)(o), \ | |
| 56 | (unsigned long)(n), \ | |
| 57 | sizeof(*(ptr)))) | |
| 58 | #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) | |
| 59 | ||
| 60 | #ifndef CONFIG_SMP | |
| 61 | #include <asm-generic/cmpxchg.h> | |
| 62 | #endif | |
| 63 | ||
| 64 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) | |
| 65 | ||
| 66 | #endif /* __ARCH_H8300_CMPXCHG__ */ |