1 files changed, 51 insertions, 3 deletions

diff --git a/include/asm-um/pgtable.h b/include/asm-um/pgtable.h
index a88040920311..b48e0966ecd7 100644
--- a/include/asm-um/pgtable.h
+++ b/include/asm-um/pgtable.h
@@ -16,13 +16,15 @@
 
 #define _PAGE_PRESENT   0x001
 #define _PAGE_NEWPAGE   0x002
-#define _PAGE_NEWPROT   0x004
-#define _PAGE_FILE      0x008   /* set:pagecache unset:swap */
-#define _PAGE_PROTNONE  0x010   /* If not present */
+#define _PAGE_NEWPROT   0x004
 #define _PAGE_RW        0x020
 #define _PAGE_USER      0x040
 #define _PAGE_ACCESSED  0x080
 #define _PAGE_DIRTY     0x100
+/* If _PAGE_PRESENT is clear, we use these: */
+#define _PAGE_FILE      0x008   /* nonlinear file mapping, saved PTE; unset:swap */
+#define _PAGE_PROTNONE  0x010   /* if the user mapped it with PROT_NONE;
+                                   pte_present gives true */
 
 #ifdef CONFIG_3_LEVEL_PGTABLES
 #include "asm/pgtable-3level.h"
@@ -151,10 +153,24 @@ extern unsigned long pg0[1024];
 
 #define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
 
+#define pte_page(x) pfn_to_page(pte_pfn(x))
 #define pte_address(x) (__va(pte_val(x) & PAGE_MASK))
 #define mk_phys(a, r) ((a) + (((unsigned long) r) << REGION_SHIFT))
 #define phys_addr(p) ((p) & ~REGION_MASK)
 
+#define pte_present(x)  pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))
+
+/*
+ * =================================
+ * Flags checking section.
+ * =================================
+ */
+
+static inline int pte_none(pte_t pte)
+{
+        return pte_is_zero(pte);
+}
+
 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
@@ -210,6 +226,18 @@ static inline int pte_newprot(pte_t pte)
         return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
 }
 
+/*
+ * =================================
+ * Flags setting section.
+ * =================================
+ */
+
+static inline pte_t pte_mknewprot(pte_t pte)
+{
+        pte_set_bits(pte, _PAGE_NEWPROT);
+        return(pte);
+}
+
 static inline pte_t pte_rdprotect(pte_t pte)
 { 
         pte_clear_bits(pte, _PAGE_USER);
@@ -278,6 +306,26 @@ static inline pte_t pte_mkuptodate(pte_t pte)
         return(pte); 
 }
 
+static inline pte_t pte_mknewpage(pte_t pte)
+{
+        pte_set_bits(pte, _PAGE_NEWPAGE);
+        return(pte);
+}
+
+static inline void set_pte(pte_t *pteptr, pte_t pteval)
+{
+        pte_copy(*pteptr, pteval);
+
+        /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
+         * fix_range knows to unmap it.  _PAGE_NEWPROT is specific to
+         * mapped pages.
+         */
+
+        *pteptr = pte_mknewpage(*pteptr);
+        if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
+}
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
 extern phys_t page_to_phys(struct page *page);
 
 /*