[src/trunk]: src/sys/arch/sparc64/sparc64 Add ucas_32 and ucas_64 functions -...

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

details:   https://anonhg.NetBSD.org/src/rev/37a847b6c045
branches:  trunk
changeset: 755135:37a847b6c045
user:      martin <martin%NetBSD.org@localhost>
date:      Sun May 23 19:54:17 2010 +0000

description:
Add ucas_32 and ucas_64 functions - untested.

diffstat:

 sys/arch/sparc64/sparc64/copy.S |  60 ++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 59 insertions(+), 1 deletions(-)

diffs (74 lines):

diff -r 1ec64b8465d1 -r 37a847b6c045 sys/arch/sparc64/sparc64/copy.S
--- a/sys/arch/sparc64/sparc64/copy.S   Sun May 23 19:00:28 2010 +0000
+++ b/sys/arch/sparc64/sparc64/copy.S   Sun May 23 19:54:17 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: copy.S,v 1.1 2010/05/23 18:49:14 martin Exp $  */
+/*     $NetBSD: copy.S,v 1.2 2010/05/23 19:54:17 martin Exp $  */
 
 /*
  * Copyright (c) 2006-2010 Matthew R. Green
@@ -612,6 +612,64 @@
        retl
         wr     %g0, ASI_PRIMARY_NOFAULT, %asi          ! Restore ASI
 
+
+STRONG_ALIAS(ucas_int,ucas_32)
+#ifdef _LP64
+STRONG_ALIAS(ucas_ptr,ucas_64)
+#else
+STRONG_ALIAS(ucas_ptr,ucas_32)
+#endif
+
+/*
+ * Compare-and-swap the pointer in the user-space.
+ *
+ * int ucas_32(volatile int32_t *uptr, int32_t old, int32_t new, int32_t *ret);
+ */
+ENTRY(ucas_32)
+       sethi   %hi(CPCB), %o4
+       wr      %g0, ASI_AIUS, %asi
+       LDPTR   [%o4 + %lo(CPCB)], %o4
+       set     Lcopyfault, %o5                         ! reusing copyin/copyout
+       membar  #Sync                                   ! fault handler
+       STPTR   %o5, [%o4 + PCB_ONFAULT]
+
+       casa    [%o0] %asi, %o1, %o2                    ! cas, result in %o2
+
+       sethi   %hi(CPCB), %o4
+       LDPTR   [%o4 + %lo(CPCB)], %o4
+       membar  #Sync
+       STPTR   %g0, [%o4 + PCB_ONFAULT]
+       wr      %g0, ASI_PRIMARY_NOFAULT, %asi          ! Restore ASI
+       membar  #StoreStore|#StoreLoad
+       stw     %o2, [%o3]              ! store the cas result in *result
+       retl
+        clr    %o0                     ! return 0
+
+/*
+ * Compare-and-swap the 64-bit integer in the user-space.
+ *
+ * int ucas_64(volatile int64_t *uptr, int64_t old, int64_t new, int64_t *ret);
+ */
+ENTRY(ucas_64)
+       sethi   %hi(CPCB), %o4
+       wr      %g0, ASI_AIUS, %asi
+       LDPTR   [%o4 + %lo(CPCB)], %o4
+       set     Lcopyfault, %o5                         ! reusing copyin/copyout
+       membar  #Sync                                   ! fault handler
+       STPTR   %o5, [%o4 + PCB_ONFAULT]
+
+       casxa   [%o0] %asi, %o1, %o2                    ! cas, result in %o2
+
+       sethi   %hi(CPCB), %o4
+       LDPTR   [%o4 + %lo(CPCB)], %o4
+       membar  #Sync
+       STPTR   %g0, [%o4 + PCB_ONFAULT]
+       wr      %g0, ASI_PRIMARY_NOFAULT, %asi          ! Restore ASI
+       membar  #StoreStore|#StoreLoad
+       stx     %o2, [%o3]              ! store the cas result in *result
+       retl
+        clr    %o0                     ! return 0
+
 /*
  * {fu,su}{,i}{byte,word}
  */