ibm4xx pmap: execution permission for kernel mappings

[Matthias Drochner <M.Drochner%fz-juelich.de@localhost>]

This _should_ work. Alpha was handling this correctly
all the time, and I've just switched amd64 to do likewise.
There was a problem with LKMs, but this should be fixed too.

I can't test myself, but if someone is adventurous he could
try the appended patch.

best regards
Matthias


--- pmap.c.~1.40.~      Tue Jul  4 12:30:34 2006
+++ pmap.c      Wed Jul  5 17:53:39 2006
@@ -912,16 +912,11 @@ pmap_kenter_pa(vaddr_t va, paddr_t pa, v
 
        /*
         * Generate TTE.
-        *
-        * XXXX
-        *
-        * Since the kernel does not handle execution privileges properly,
-        * we will handle read and execute permissions together.
         */
        tte = 0;
        if (prot & VM_PROT_ALL) {
 
-               tte = TTE_PA(pa) | TTE_EX | TTE_ZONE(ZONE_PRIV);
+               tte = TTE_PA(pa) | TTE_ZONE(ZONE_PRIV);
                /* XXXX -- need to support multiple page sizes. */
                tte |= TTE_SZ_16K;
 #ifdef DIAGNOSTIC
@@ -941,6 +936,8 @@ pmap_kenter_pa(vaddr_t va, paddr_t pa, v
 #endif
                if (prot & VM_PROT_WRITE)
                        tte |= TTE_WR;
+               if (prot & VM_PROT_EXECUTE)
+                       tte |= TTE_EX;
        }
 
        s = splvm();