powerpc/mm/32s: use _PAGE_EXEC in setbat()

Do not set IBAT when setbat() is called without _PAGE_EXEC

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index 621392e6d4664f816654e6dd330901a293d9107b..9225da8bae4c4a4d58828e735731c944dda90649 100644 (file)
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -131,6 +131,7 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
  * Set up one of the I/D BAT (block address translation) register pairs.
  * The parameters are not checked; in particular size must be a power
  * of 2 between 128k and 256M.
+ * On 603+, only set IBAT when _PAGE_EXEC is set
  */
 void __init setbat(int index, unsigned long virt, phys_addr_t phys,
                   unsigned int size, pgprot_t prot)
@@ -157,11 +158,12 @@ void __init setbat(int index, unsigned long virt, phys_addr_t phys,
                        bat[1].batu |= 1;       /* Vp = 1 */
                if (flags & _PAGE_GUARDED) {
                        /* G bit must be zero in IBATs */
-                       bat[0].batu = bat[0].batl = 0;
-               } else {
-                       /* make IBAT same as DBAT */
-                       bat[0] = bat[1];
+                       flags &= ~_PAGE_EXEC;
                }
+               if (flags & _PAGE_EXEC)
+                       bat[0] = bat[1];
+               else
+                       bat[0].batu = bat[0].batl = 0;
        } else {
                /* 601 cpu */
                if (bl > BL_8M)