sh: Add support for 16kB PAGE_SIZE.

16kB is a useful size on nommu, while 64kB still tends to be too big to
be useful. Newer MMUs are likely to support this as well, so plug it
in in anticipation of those, too.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

4 files changed, 13 insertions, 1 deletions

diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 5267c434d6eb..29d8e3c58b34 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -155,6 +155,12 @@ config PAGE_SIZE_8KB
         help
           This enables 8kB pages as supported by SH-X2 and later MMUs.
 
+config PAGE_SIZE_16KB
+        bool "16kB"
+        depends on !MMU
+        help
+          This enables 16kB pages on MMU-less SH systems.
+
 config PAGE_SIZE_64KB
         bool "64kB"
         depends on !MMU || CPU_SH4 || CPU_SH5
diff --git a/include/asm-sh/page.h b/include/asm-sh/page.h
index 5dc01d2fcc4c..77fb8bf02e4e 100644
--- a/include/asm-sh/page.h
+++ b/include/asm-sh/page.h
@@ -12,6 +12,8 @@
 # define PAGE_SHIFT     12
 #elif defined(CONFIG_PAGE_SIZE_8KB)
 # define PAGE_SHIFT     13
+#elif defined(CONFIG_PAGE_SIZE_16KB)
+# define PAGE_SHIFT     14
 #elif defined(CONFIG_PAGE_SIZE_64KB)
 # define PAGE_SHIFT     16
 #else
diff --git a/include/asm-sh/pgtable_32.h b/include/asm-sh/pgtable_32.h
index cbc731d35c25..72ea209195bd 100644
--- a/include/asm-sh/pgtable_32.h
+++ b/include/asm-sh/pgtable_32.h
@@ -102,7 +102,9 @@
 #define _PAGE_FLAGS_HARDWARE_MASK       (PHYS_ADDR_MASK & ~(_PAGE_CLEAR_FLAGS))
 
 /* Hardware flags, page size encoding */
-#if defined(CONFIG_X2TLB)
+#if !defined(CONFIG_MMU)
+# define _PAGE_FLAGS_HARD       0ULL
+#elif defined(CONFIG_X2TLB)
 # if defined(CONFIG_PAGE_SIZE_4KB)
 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ0)
 # elif defined(CONFIG_PAGE_SIZE_8KB)
diff --git a/include/asm-sh/thread_info.h b/include/asm-sh/thread_info.h
index 5131e3907525..eeb4c747119e 100644
--- a/include/asm-sh/thread_info.h
+++ b/include/asm-sh/thread_info.h
@@ -38,6 +38,8 @@ struct thread_info {
 #define THREAD_SIZE_ORDER       (1)
 #elif defined(CONFIG_PAGE_SIZE_8KB)
 #define THREAD_SIZE_ORDER       (1)
+#elif defined(CONFIG_PAGE_SIZE_16KB)
+#define THREAD_SIZE_ORDER       (0)
 #elif defined(CONFIG_PAGE_SIZE_64KB)
 #define THREAD_SIZE_ORDER       (0)
 #else