Add a per-page flag to indicate that all mappings of that page should be

uncached.  To be used in the drm code.

ok mpi@

diff --git a/sys/arch/powerpc/include/pmap.h b/sys/arch/powerpc/include/pmap.h
index de3607d..7a0f760 100644 (file)
--- a/sys/arch/powerpc/include/pmap.h
+++ b/sys/arch/powerpc/include/pmap.h
@@ -1,4 +1,4 @@
-/*     $OpenBSD: pmap.h,v 1.58 2015/09/11 22:02:18 kettenis Exp $      */
+/*     $OpenBSD: pmap.h,v 1.59 2015/10/08 10:20:14 kettenis Exp $      */
 /*     $NetBSD: pmap.h,v 1.1 1996/09/30 16:34:29 ws Exp $      */
 
 /*-
@@ -150,9 +150,10 @@ int reserve_dumppages(caddr_t p);
 
 #define        PMAP_STEAL_MEMORY
 
-#define PG_PMAP_MOD     PG_PMAP0
-#define PG_PMAP_REF     PG_PMAP1
-#define PG_PMAP_EXE     PG_PMAP2
+#define PG_PMAP_MOD    PG_PMAP0
+#define PG_PMAP_REF    PG_PMAP1
+#define PG_PMAP_EXE    PG_PMAP2
+#define PG_PMAP_UC     PG_PMAP3
 
 /*
  * MD flags that we use for pmap_enter (in the pa):

diff --git a/sys/arch/powerpc/powerpc/pmap.c b/sys/arch/powerpc/powerpc/pmap.c
index d867415..97d7fca 100644 (file)
--- a/sys/arch/powerpc/powerpc/pmap.c
+++ b/sys/arch/powerpc/powerpc/pmap.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: pmap.c,v 1.162 2015/09/11 22:02:18 kettenis Exp $ */
+/*     $OpenBSD: pmap.c,v 1.163 2015/10/08 10:20:14 kettenis Exp $ */
 
 /*
  * Copyright (c) 2015 Martin Pieuchot
@@ -582,6 +582,8 @@ pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags)
        }
 
        pg = PHYS_TO_VM_PAGE(pa);
+       if (pg->pg_flags & PG_PMAP_UC)
+               nocache = TRUE;
        if (wt)
                cache = PMAP_CACHE_WT;
        else if (pg != NULL && !(pg->pg_flags & PG_DEV) && !nocache)