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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef __ASM_SH_CMPXCHG_H |
| 3 | #define __ASM_SH_CMPXCHG_H |
| 4 | |
| 5 | /* |
| 6 | * Atomic operations that C can't guarantee us. Useful for |
| 7 | * resource counting etc.. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/compiler.h> |
| 11 | #include <linux/types.h> |
| 12 | |
| 13 | #if defined(CONFIG_GUSA_RB) |
| 14 | #include <asm/cmpxchg-grb.h> |
| 15 | #elif defined(CONFIG_CPU_SH4A) |
| 16 | #include <asm/cmpxchg-llsc.h> |
| 17 | #elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP) |
| 18 | #include <asm/cmpxchg-cas.h> |
| 19 | #else |
| 20 | #include <asm/cmpxchg-irq.h> |
| 21 | #endif |
| 22 | |
| 23 | extern void __xchg_called_with_bad_pointer(void); |
| 24 | |
| 25 | #define __arch_xchg(ptr, x, size) \ |
| 26 | ({ \ |
| 27 | unsigned long __xchg__res; \ |
| 28 | volatile void *__xchg_ptr = (ptr); \ |
| 29 | switch (size) { \ |
| 30 | case 4: \ |
| 31 | __xchg__res = xchg_u32(__xchg_ptr, x); \ |
| 32 | break; \ |
| 33 | case 2: \ |
| 34 | __xchg__res = xchg_u16(__xchg_ptr, x); \ |
| 35 | break; \ |
| 36 | case 1: \ |
| 37 | __xchg__res = xchg_u8(__xchg_ptr, x); \ |
| 38 | break; \ |
| 39 | default: \ |
| 40 | __xchg_called_with_bad_pointer(); \ |
| 41 | __xchg__res = x; \ |
| 42 | break; \ |
| 43 | } \ |
| 44 | \ |
| 45 | __xchg__res; \ |
| 46 | }) |
| 47 | |
| 48 | #define arch_xchg(ptr,x) \ |
| 49 | ((__typeof__(*(ptr)))__arch_xchg((ptr),(unsigned long)(x), sizeof(*(ptr)))) |
| 50 | |
| 51 | /* This function doesn't exist, so you'll get a linker error |
| 52 | * if something tries to do an invalid cmpxchg(). */ |
| 53 | extern void __cmpxchg_called_with_bad_pointer(void); |
| 54 | |
| 55 | static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old, |
| 56 | unsigned long new, int size) |
| 57 | { |
| 58 | switch (size) { |
| 59 | case 4: |
| 60 | return __cmpxchg_u32(ptr, old, new); |
| 61 | } |
| 62 | __cmpxchg_called_with_bad_pointer(); |
| 63 | return old; |
| 64 | } |
| 65 | |
| 66 | #define arch_cmpxchg(ptr,o,n) \ |
| 67 | ({ \ |
| 68 | __typeof__(*(ptr)) _o_ = (o); \ |
| 69 | __typeof__(*(ptr)) _n_ = (n); \ |
| 70 | (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ |
| 71 | (unsigned long)_n_, sizeof(*(ptr))); \ |
| 72 | }) |
| 73 | |
| 74 | #include <asm-generic/cmpxchg-local.h> |
| 75 | |
| 76 | #define arch_cmpxchg_local(ptr, o, n) ({ \ |
| 77 | (__typeof__(*ptr))__generic_cmpxchg_local((ptr), \ |
| 78 | (unsigned long)(o), \ |
| 79 | (unsigned long)(n), \ |
| 80 | sizeof(*(ptr))); \ |
| 81 | }) |
| 82 | |
| 83 | #endif /* __ASM_SH_CMPXCHG_H */ |
| 84 |
Warning: That file was not part of the compilation database. It may have many parsing errors.