1 files changed, 25 insertions, 0 deletions

diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
index f6be4741f7e8..5e08bcc74897 100644
--- a/arch/mips/include/asm/page.h
+++ b/arch/mips/include/asm/page.h
@@ -11,6 +11,8 @@
 
 #include <spaces.h>
 #include <linux/const.h>
+#include <linux/kernel.h>
+#include <asm/mipsregs.h>
 
 /*
  * PAGE_SHIFT determines the page size
@@ -33,6 +35,29 @@
 #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
 #define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
 
+/*
+ * This is used for calculating the real page sizes
+ * for FTLB or VTLB + FTLB confugrations.
+ */
+static inline unsigned int page_size_ftlb(unsigned int mmuextdef)
+{
+        switch (mmuextdef) {
+        case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
+                if (PAGE_SIZE == (1 << 30))
+                        return 5;
+                if (PAGE_SIZE == (1llu << 32))
+                        return 6;
+                if (PAGE_SIZE > (256 << 10))
+                        return 7; /* reserved */
+                        /* fall through */
+        case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
+                return (PAGE_SHIFT - 10) / 2;
+        default:
+                panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n",
+                      mmuextdef >> 14);
+        }
+}
+
 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
 #define HPAGE_SHIFT     (PAGE_SHIFT + PAGE_SHIFT - 3)
 #define HPAGE_SIZE      (_AC(1,UL) << HPAGE_SHIFT)