diff options
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/sparc/sparc/asm.h | 8 | ||||
| -rw-r--r-- | sys/arch/sparc/sparc/pmap.c | 4 |
2 files changed, 9 insertions, 3 deletions
diff --git a/sys/arch/sparc/sparc/asm.h b/sys/arch/sparc/sparc/asm.h index 534853ce491..3258be1e584 100644 --- a/sys/arch/sparc/sparc/asm.h +++ b/sys/arch/sparc/sparc/asm.h @@ -1,4 +1,4 @@ -/* $OpenBSD: asm.h,v 1.2 1997/08/08 08:26:58 downsj Exp $ */ +/* $OpenBSD: asm.h,v 1.3 1999/09/03 18:11:28 art Exp $ */ /* $NetBSD: asm.h,v 1.4 1996/07/01 18:01:26 abrown Exp $ */ /* @@ -117,3 +117,9 @@ __asm __volatile("stda %0,[%1]%2" : : \ "r" ((long long)(value)), "r" ((int)(loc)), "n" (asi)); \ }) + +/* atomic swap of a word between a register and memory */ +#define swap(loc, val) ({ \ + __asm __volatile("swap [%2],%0" : "=&r" (val) : "0" (val), "r" (loc)); \ +}) + diff --git a/sys/arch/sparc/sparc/pmap.c b/sys/arch/sparc/sparc/pmap.c index 1867c14bcff..0416d02833f 100644 --- a/sys/arch/sparc/sparc/pmap.c +++ b/sys/arch/sparc/sparc/pmap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap.c,v 1.32 1999/09/03 18:01:59 art Exp $ */ +/* $OpenBSD: pmap.c,v 1.33 1999/09/03 18:11:29 art Exp $ */ /* $NetBSD: pmap.c,v 1.118 1998/05/19 19:00:18 thorpej Exp $ */ /* @@ -612,7 +612,7 @@ setpgt4m(ptep, pte) int *ptep; int pte; { - *ptep = pte; + swap(ptep, pte); if ((cpuinfo.flags & CPUFLG_CACHEPAGETABLES) == 0) cpuinfo.pcache_flush_line((int)ptep, VA2PA((caddr_t)ptep)); } |