x86: implement set_pte_vaddr

[karo-tx-linux.git] / include / asm-x86 / pgtable.h

diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
index 801b31f714524052a2e44652bcf8db0746a45a57..702f2699c6df315b24de2e4efd0db6b4a023518c 100644 (file)
--- a/include/asm-x86/pgtable.h
+++ b/include/asm-x86/pgtable.h
@@ -57,7 +57,9 @@
 #define _KERNPG_TABLE  (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
                         _PAGE_DIRTY)
 
-#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
+/* Set of bits not changed in pte_modify */
+#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_PCD | _PAGE_PWT |             \
+                        _PAGE_ACCESSED | _PAGE_DIRTY)
 
 #define _PAGE_CACHE_MASK       (_PAGE_PCD | _PAGE_PWT)
 #define _PAGE_CACHE_WB         (0)
@@ -288,13 +290,22 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
         * Chop off the NX bit (if present), and add the NX portion of
         * the newprot (if present):
         */
-       val &= _PAGE_CHG_MASK & ~_PAGE_NX;
-       val |= pgprot_val(newprot) & __supported_pte_mask;
+       val &= _PAGE_CHG_MASK;
+       val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
 
        return __pte(val);
 }
 
-#define pte_pgprot(x) __pgprot(pte_val(x) & (0xfff | _PAGE_NX))
+/* mprotect needs to preserve PAT bits when updating vm_page_prot */
+#define pgprot_modify pgprot_modify
+static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
+{
+       pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
+       pgprotval_t addbits = pgprot_val(newprot);
+       return __pgprot(preservebits | addbits);
+}
+
+#define pte_pgprot(x) __pgprot(pte_val(x) & ~PTE_MASK)
 
 #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
 
@@ -307,6 +318,9 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
                               unsigned long size, pgprot_t *vma_prot);
 #endif
 
+/* Install a pte for a particular vaddr in kernel space. */
+void set_pte_vaddr(unsigned long vaddr, pte_t pte);
+
 #ifdef CONFIG_PARAVIRT
 #include <asm/paravirt.h>
 #else  /* !CONFIG_PARAVIRT */