diff options
Diffstat (limited to 'sys/arch/sparc64/include/lock.h')
| -rw-r--r-- | sys/arch/sparc64/include/lock.h | 47 |
1 files changed, 1 insertions, 46 deletions
diff --git a/sys/arch/sparc64/include/lock.h b/sys/arch/sparc64/include/lock.h index 5b3e63db804..ef6820871c7 100644 --- a/sys/arch/sparc64/include/lock.h +++ b/sys/arch/sparc64/include/lock.h @@ -1,4 +1,4 @@ -/* $OpenBSD: lock.h,v 1.11 2017/05/27 15:11:03 mpi Exp $ */ +/* $OpenBSD: lock.h,v 1.12 2017/05/29 14:19:50 mpi Exp $ */ /* * Copyright (c) 2012 Mark Kettenis <kettenis@openbsd.org> * @@ -18,49 +18,4 @@ #ifndef _MACHINE_LOCK_H_ #define _MACHINE_LOCK_H_ -#ifdef _KERNEL - -/* - * On processors with multiple threads we force a thread switch. - * - * On UltraSPARC T2 and its successors, the optimal way to do this - * seems to be to do three nop reads of %ccr. This works on - * UltraSPARC T1 as well, even though three nop casx operations seem - * to be slightly more optimal. Since these instructions are - * effectively nops, executing them on earlier non-CMT processors is - * harmless, so we make this the default. - * - * On SPARC T4 and later, we can use the processor-specific pause - * instruction. - * - * On SPARC64 VI and its successors we execute the processor-specific - * sleep instruction. - */ -#define SPINLOCK_SPIN_HOOK \ -do { \ - __asm volatile( \ - "999: rd %%ccr, %%g0 \n" \ - " rd %%ccr, %%g0 \n" \ - " rd %%ccr, %%g0 \n" \ - " .section .sun4v_pause_patch, \"ax\" \n" \ - " .word 999b \n" \ - " .word 0xb7802080 ! pause 128 \n" \ - " .word 999b + 4 \n" \ - " nop \n" \ - " .word 999b + 8 \n" \ - " nop \n" \ - " .previous \n" \ - " .section .sun4u_mtp_patch, \"ax\" \n" \ - " .word 999b \n" \ - " .word 0x81b01060 ! sleep \n" \ - " .word 999b + 4 \n" \ - " nop \n" \ - " .word 999b + 8 \n" \ - " nop \n" \ - " .previous \n" \ - : : : "memory"); \ -} while (0) - - -#endif /* _KERNEL */ #endif /* _MACHINE_LOCK_H_ */ |