sh: Preliminary support for SH-X2 MMU.
This adds some preliminary support for the SH-X2 MMU, used by
newer SH-4A parts (particularly SH7785).
This MMU implements a 'compat' mode with SH-X MMUs and an
'extended' mode for SH-X2 extended features. Extended features
include additional page sizes (8kB, 4MB, 64MB), as well as the
addition of page execute permissions.
The extended mode attributes are placed in a second data array,
which requires us to switch to 64-bit PTEs when in X2 mode.
With the addition of the exec perms, we also overhaul the mmap
prots somewhat, now that it's possible to handle them more
intelligently.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 7154d1c..8b27516 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -93,7 +93,7 @@
pud = pud_offset(pgd, addr);
if (pud_none(*pud)) {
pmd = (pmd_t *)get_zeroed_page(GFP_ATOMIC);
- set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
+ set_pud(pud, __pud(__pa(pmd) | _PAGE_TABLE));
if (pmd != pmd_offset(pud, 0)) {
pud_ERROR(*pud);
return;
@@ -103,7 +103,7 @@
pmd = pmd_offset(pud, addr);
if (pmd_none(*pmd)) {
pte = (pte_t *)get_zeroed_page(GFP_ATOMIC);
- set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
+ set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
if (pte != pte_offset_kernel(pmd, 0)) {
pmd_ERROR(*pmd);
return;