[src/trunk]: src/sys/arch/powerpc/include Implement powerpc spin lock functions.

[tsubai <tsubai%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/21cb4ee2dedf
branches:  trunk
changeset: 494410:21cb4ee2dedf
user:      tsubai <tsubai%NetBSD.org@localhost>
date:      Thu Jul 06 03:52:25 2000 +0000

description:
Implement powerpc spin lock functions.

diffstat:

 sys/arch/powerpc/include/lock.h |  68 +++++++++++++++++++++++++++++++++++++---
 1 files changed, 63 insertions(+), 5 deletions(-)

diffs (83 lines):

diff -r d80984dcab11 -r 21cb4ee2dedf sys/arch/powerpc/include/lock.h
--- a/sys/arch/powerpc/include/lock.h   Thu Jul 06 03:39:53 2000 +0000
+++ b/sys/arch/powerpc/include/lock.h   Thu Jul 06 03:52:25 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: lock.h,v 1.2 2000/05/02 04:41:10 thorpej Exp $ */
+/*     $NetBSD: lock.h,v 1.3 2000/07/06 03:52:25 tsubai Exp $  */
 
 /*-
  * Copyright (c) 2000 The NetBSD Foundation, Inc.
@@ -41,11 +41,69 @@
  */
 
 #ifndef _POWERPC_LOCK_H_
-#define        _POWERPC_LOCK_H_
+#define _POWERPC_LOCK_H_
+
+typedef __volatile int __cpu_simple_lock_t;
+
+#define __SIMPLELOCK_LOCKED    1
+#define __SIMPLELOCK_UNLOCKED  0
+
+static __inline void
+__cpu_simple_lock_init(__cpu_simple_lock_t *alp)
+{
+       *alp = __SIMPLELOCK_UNLOCKED;
+       __asm __volatile ("sync");
+}
+
+static __inline void
+__cpu_simple_lock(__cpu_simple_lock_t *alp)
+{
+       int old;
 
-typedef        __volatile int          __cpu_simple_lock_t;
+       __asm __volatile ("     \n\
+                               \n\
+1:     lwarx   %0,0,%1         \n\
+       cmpwi   %0,%2           \n\
+       beq+    3f              \n\
+2:     lwz     %0,0(%1)        \n\
+       cmpwi   %0,%2           \n\
+       beq+    1b              \n\
+       b       2b              \n\
+3:     stwcx.  %3,0,%1         \n\
+       bne-    1b              \n\
+       isync                   \n\
+                               \n"
+       : "=&r"(old)
+       : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED)
+       : "memory");
+}
+
+static __inline int
+__cpu_simple_lock_try(__cpu_simple_lock_t *alp)
+{
+       int old;
 
-#define        __SIMPLELOCK_LOCKED     1
-#define        __SIMPLELOCK_UNLOCKED   0
+       __asm __volatile ("     \n\
+                               \n\
+1:     lwarx   %0,0,%1         \n\
+       cmpwi   %0,%2           \n\
+       bne     2f              \n\
+       stwcx.  %3,0,%1         \n\
+       bne-    1b              \n\
+       isync                   \n\
+2:                             \n"
+       : "=&r"(old)
+       : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED)
+       : "memory");
+
+       return (old == __SIMPLELOCK_UNLOCKED);
+}
+
+static __inline void
+__cpu_simple_unlock(__cpu_simple_lock_t *alp)
+{
+       __asm __volatile ("sync");
+       *alp = __SIMPLELOCK_UNLOCKED;
+}
 
 #endif /* _POWERPC_LOCK_H_ */