Move SPINLOCK_SPIN_HOOK to the header used by other archs in order to

prepare the terrain for MI locks.

ok kettenis@

1 files changed, 61 insertions, 3 deletions

diff --git a/sys/arch/sparc64/include/lock.h b/sys/arch/sparc64/include/lock.h
index a34bb3d7be3..5b3e63db804 100644
--- a/sys/arch/sparc64/include/lock.h
+++ b/sys/arch/sparc64/include/lock.h
@@ -1,8 +1,66 @@
-/*	$OpenBSD: lock.h,v 1.10 2015/02/11 00:14:11 dlg Exp $	*/
-
-/* public domain */
+/*	$OpenBSD: lock.h,v 1.11 2017/05/27 15:11:03 mpi Exp $	*/
+/*
+ * Copyright (c) 2012 Mark Kettenis <kettenis@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
 
 #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_ */