Merge master.kernel.org:/home/rmk/linux-2.6-arm

[linux-2.6-microblaze.git] / include / asm-mips / page.h

diff --git a/include/asm-mips/page.h b/include/asm-mips/page.h
index 5cae35c..ee25a77 100644 (file)
--- a/include/asm-mips/page.h
+++ b/include/asm-mips/page.h
@@ -87,35 +87,47 @@ static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 typedef struct { unsigned long pte; } pte_t;
 #define pte_val(x)     ((x).pte)
 #endif
+#define __pte(x)       ((pte_t) { (x) } )
 
-typedef struct { unsigned long pmd; } pmd_t;
-typedef struct { unsigned long pgd; } pgd_t;
-typedef struct { unsigned long pgprot; } pgprot_t;
+/*
+ * For 3-level pagetables we defines these ourselves, for 2-level the
+ * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
+ */
+#ifdef CONFIG_64BIT
 
+typedef struct { unsigned long pmd; } pmd_t;
 #define pmd_val(x)     ((x).pmd)
-#define pgd_val(x)     ((x).pgd)
-#define pgprot_val(x)  ((x).pgprot)
+#define __pmd(x)       ((pmd_t) { (x) } )
 
-#define ptep_buddy(x)  ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
+#endif
 
-#define __pte(x)       ((pte_t) { (x) } )
-#define __pmd(x)       ((pmd_t) { (x) } )
+/*
+ * Right now we don't support 4-level pagetables, so all pud-related
+ * definitions come from <asm-generic/pgtable-nopud.h>.
+ */
+
+/*
+ * Finall the top of the hierarchy, the pgd
+ */
+typedef struct { unsigned long pgd; } pgd_t;
+#define pgd_val(x)     ((x).pgd)
 #define __pgd(x)       ((pgd_t) { (x) } )
+
+/*
+ * Manipulate page protection bits
+ */
+typedef struct { unsigned long pgprot; } pgprot_t;
+#define pgprot_val(x)  ((x).pgprot)
 #define __pgprot(x)    ((pgprot_t) { (x) } )
 
-/* Pure 2^n version of get_order */
-static __inline__ int get_order(unsigned long size)
-{
-       int order;
-
-       size = (size-1) >> (PAGE_SHIFT-1);
-       order = -1;
-       do {
-               size >>= 1;
-               order++;
-       } while (size);
-       return order;
-}
+/*
+ * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
+ * pair of pages we only have a single global bit per pair of pages.  When
+ * writing to the TLB make sure we always have the bit set for both pages
+ * or none.  This macro is used to access the `buddy' of the pte we're just
+ * working on.
+ */
+#define ptep_buddy(x)  ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 
 #endif /* !__ASSEMBLY__ */
 
@@ -148,4 +160,6 @@ static __inline__ int get_order(unsigned long size)
 #define WANT_PAGE_VIRTUAL
 #endif
 
+#include <asm-generic/page.h>
+
 #endif /* _ASM_PAGE_H */