1 files changed, 61 insertions, 42 deletions

diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h
index 702a28fa7a34..d0af2a3b0152 100644
--- a/include/asm-mips/pgtable.h
+++ b/include/asm-mips/pgtable.h
@@ -70,7 +70,15 @@ extern unsigned long zero_page_mask;
 #define ZERO_PAGE(vaddr) \
         (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
 
-#define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
+#define __HAVE_ARCH_MOVE_PTE
+#define move_pte(pte, prot, old_addr, new_addr)                         \
+({                                                                      \
+        pte_t newpte = (pte);                                           \
+        if (pte_present(pte) && pfn_valid(pte_pfn(pte)) &&              \
+                        pte_page(pte) == ZERO_PAGE(old_addr))           \
+                newpte = mk_pte(ZERO_PAGE(new_addr), (prot));           \
+        newpte;                                                         \
+})
 
 extern void paging_init(void);
 
@@ -82,10 +90,11 @@ extern void paging_init(void);
 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 #define pmd_page_kernel(pmd)    pmd_val(pmd)
 
-#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
-#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
-
 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
+
+#define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
+#define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
+
 static inline void set_pte(pte_t *ptep, pte_t pte)
 {
         ptep->pte_high = pte.pte_high;
@@ -93,27 +102,35 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
         ptep->pte_low = pte.pte_low;
         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
 
-        if (pte_val(pte) & _PAGE_GLOBAL) {
+        if (pte.pte_low & _PAGE_GLOBAL) {
                 pte_t *buddy = ptep_buddy(ptep);
                 /*
                  * Make sure the buddy is global too (if it's !none,
                  * it better already be global)
                  */
-                if (pte_none(*buddy))
-                        buddy->pte_low |= _PAGE_GLOBAL;
+                if (pte_none(*buddy)) {
+                        buddy->pte_low  |= _PAGE_GLOBAL;
+                        buddy->pte_high |= _PAGE_GLOBAL;
+                }
         }
 }
 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 
 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
+        pte_t null = __pte(0);
+
         /* Preserve global status for the pair */
-        if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
-                set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
-        else
-                set_pte_at(mm, addr, ptep, __pte(0));
+        if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
+                null.pte_low = null.pte_high = _PAGE_GLOBAL;
+
+        set_pte_at(mm, addr, ptep, null);
 }
 #else
+
+#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
+#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
+
 /*
  * Certain architectures need to do special things when pte's
  * within a page table are directly modified.  Thus, the following
@@ -174,75 +191,76 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
  */
 static inline int pte_user(pte_t pte)   { BUG(); return 0; }
 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
-static inline int pte_read(pte_t pte)   { return (pte).pte_low & _PAGE_READ; }
-static inline int pte_write(pte_t pte)  { return (pte).pte_low & _PAGE_WRITE; }
-static inline int pte_dirty(pte_t pte)  { return (pte).pte_low & _PAGE_MODIFIED; }
-static inline int pte_young(pte_t pte)  { return (pte).pte_low & _PAGE_ACCESSED; }
-static inline int pte_file(pte_t pte)   { return (pte).pte_low & _PAGE_FILE; }
+static inline int pte_read(pte_t pte)   { return pte.pte_low & _PAGE_READ; }
+static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
+static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
+static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
+static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
+
 static inline pte_t pte_wrprotect(pte_t pte)
 {
-        (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
-        (pte).pte_high &= ~_PAGE_SILENT_WRITE;
+        pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
+        pte.pte_high &= ~_PAGE_SILENT_WRITE;
         return pte;
 }
 
 static inline pte_t pte_rdprotect(pte_t pte)
 {
-        (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
-        (pte).pte_high &= ~_PAGE_SILENT_READ;
+        pte.pte_low  &= ~(_PAGE_READ | _PAGE_SILENT_READ);
+        pte.pte_high &= ~_PAGE_SILENT_READ;
         return pte;
 }
 
 static inline pte_t pte_mkclean(pte_t pte)
 {
-        (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
-        (pte).pte_high &= ~_PAGE_SILENT_WRITE;
+        pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
+        pte.pte_high &= ~_PAGE_SILENT_WRITE;
         return pte;
 }
 
 static inline pte_t pte_mkold(pte_t pte)
 {
-        (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
-        (pte).pte_high &= ~_PAGE_SILENT_READ;
+        pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
+        pte.pte_high &= ~_PAGE_SILENT_READ;
         return pte;
 }
 
 static inline pte_t pte_mkwrite(pte_t pte)
 {
-        (pte).pte_low |= _PAGE_WRITE;
-        if ((pte).pte_low & _PAGE_MODIFIED) {
-                (pte).pte_low |= _PAGE_SILENT_WRITE;
-                (pte).pte_high |= _PAGE_SILENT_WRITE;
+        pte.pte_low |= _PAGE_WRITE;
+        if (pte.pte_low & _PAGE_MODIFIED) {
+                pte.pte_low  |= _PAGE_SILENT_WRITE;
+                pte.pte_high |= _PAGE_SILENT_WRITE;
         }
         return pte;
 }
 
 static inline pte_t pte_mkread(pte_t pte)
 {
-        (pte).pte_low |= _PAGE_READ;
-        if ((pte).pte_low & _PAGE_ACCESSED) {
-                (pte).pte_low |= _PAGE_SILENT_READ;
-                (pte).pte_high |= _PAGE_SILENT_READ;
+        pte.pte_low |= _PAGE_READ;
+        if (pte.pte_low & _PAGE_ACCESSED) {
+                pte.pte_low  |= _PAGE_SILENT_READ;
+                pte.pte_high |= _PAGE_SILENT_READ;
         }
         return pte;
 }
 
 static inline pte_t pte_mkdirty(pte_t pte)
 {
-        (pte).pte_low |= _PAGE_MODIFIED;
-        if ((pte).pte_low & _PAGE_WRITE) {
-                (pte).pte_low |= _PAGE_SILENT_WRITE;
-                (pte).pte_high |= _PAGE_SILENT_WRITE;
+        pte.pte_low |= _PAGE_MODIFIED;
+        if (pte.pte_low & _PAGE_WRITE) {
+                pte.pte_low  |= _PAGE_SILENT_WRITE;
+                pte.pte_high |= _PAGE_SILENT_WRITE;
         }
         return pte;
 }
 
 static inline pte_t pte_mkyoung(pte_t pte)
 {
-        (pte).pte_low |= _PAGE_ACCESSED;
-        if ((pte).pte_low & _PAGE_READ)
-                (pte).pte_low |= _PAGE_SILENT_READ;
-                (pte).pte_high |= _PAGE_SILENT_READ;
+        pte.pte_low |= _PAGE_ACCESSED;
+        if (pte.pte_low & _PAGE_READ)
+                pte.pte_low  |= _PAGE_SILENT_READ;
+                pte.pte_high |= _PAGE_SILENT_READ;
         return pte;
 }
 #else
@@ -335,8 +353,9 @@ static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
-        pte.pte_low &= _PAGE_CHG_MASK;
-        pte.pte_low |= pgprot_val(newprot);
+        pte.pte_low  &= _PAGE_CHG_MASK;
+        pte.pte_high &= ~0x3f;
+        pte.pte_low  |= pgprot_val(newprot);
         pte.pte_high |= pgprot_val(newprot) & 0x3f;
         return pte;
 }