1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_SYNCH_H 3 #define _ASM_POWERPC_SYNCH_H 4 #ifdef __KERNEL__ 5 6 #include <linux/stringify.h> 7 #include <asm/feature-fixups.h> 8 9 #if defined(__powerpc64__) || defined(CONFIG_PPC_E500MC) 10 #define __SUBARCH_HAS_LWSYNC 11 #endif 12 13 #ifndef __ASSEMBLY__ 14 extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup; 15 extern void do_lwsync_fixups(unsigned long value, void *fixup_start, 16 void *fixup_end); 17 18 static inline void eieio(void) 19 { 20 __asm__ __volatile__ ("eieio" : : : "memory"); 21 } 22 23 static inline void isync(void) 24 { 25 __asm__ __volatile__ ("isync" : : : "memory"); 26 } 27 #endif /* __ASSEMBLY__ */ 28 29 #if defined(__powerpc64__) 30 # define LWSYNC lwsync 31 #elif defined(CONFIG_E500) 32 # define LWSYNC \ 33 START_LWSYNC_SECTION(96); \ 34 sync; \ 35 MAKE_LWSYNC_SECTION_ENTRY(96, __lwsync_fixup); 36 #else 37 # define LWSYNC sync 38 #endif 39 40 #ifdef CONFIG_SMP 41 #define __PPC_ACQUIRE_BARRIER \ 42 START_LWSYNC_SECTION(97); \ 43 isync; \ 44 MAKE_LWSYNC_SECTION_ENTRY(97, __lwsync_fixup); 45 #define PPC_ACQUIRE_BARRIER "\n" stringify_in_c(__PPC_ACQUIRE_BARRIER) 46 #define PPC_RELEASE_BARRIER stringify_in_c(LWSYNC) "\n" 47 #define PPC_ATOMIC_ENTRY_BARRIER "\n" stringify_in_c(sync) "\n" 48 #define PPC_ATOMIC_EXIT_BARRIER "\n" stringify_in_c(sync) "\n" 49 #else 50 #define PPC_ACQUIRE_BARRIER 51 #define PPC_RELEASE_BARRIER 52 #define PPC_ATOMIC_ENTRY_BARRIER 53 #define PPC_ATOMIC_EXIT_BARRIER 54 #endif 55 56 #endif /* __KERNEL__ */ 57 #endif /* _ASM_POWERPC_SYNCH_H */ 58