[S390] System z large page support.

[linux-2.6-omap-h63xx.git] / include / asm-s390 / pgtable.h

diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index 76e8a7904e8a9c8bda3fa560b62bed1368208bfe..fd336f2e2a7a7cece82e728f59238d74e74e0c7a 100644 (file)
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -220,6 +220,8 @@ extern char empty_zero_page[PAGE_SIZE];
 /* Software bits in the page table entry */
 #define _PAGE_SWT      0x001           /* SW pte type bit t */
 #define _PAGE_SWX      0x002           /* SW pte type bit x */
+#define _PAGE_SPECIAL  0x004           /* SW associated with special page */
+#define __HAVE_ARCH_PTE_SPECIAL
 
 /* Six different types of pages. */
 #define _PAGE_TYPE_EMPTY       0x400
@@ -231,6 +233,15 @@ extern char empty_zero_page[PAGE_SIZE];
 #define _PAGE_TYPE_EX_RO       0x202
 #define _PAGE_TYPE_EX_RW       0x002
 
+/*
+ * Only four types for huge pages, using the invalid bit and protection bit
+ * of a segment table entry.
+ */
+#define _HPAGE_TYPE_EMPTY      0x020   /* _SEGMENT_ENTRY_INV */
+#define _HPAGE_TYPE_NONE       0x220
+#define _HPAGE_TYPE_RO         0x200   /* _SEGMENT_ENTRY_RO  */
+#define _HPAGE_TYPE_RW         0x000
+
 /*
  * PTE type bits are rather complicated. handle_pte_fault uses pte_present,
  * pte_none and pte_file to find out the pte type WITHOUT holding the page
@@ -323,6 +334,9 @@ extern char empty_zero_page[PAGE_SIZE];
 #define _SEGMENT_ENTRY         (0)
 #define _SEGMENT_ENTRY_EMPTY   (_SEGMENT_ENTRY_INV)
 
+#define _SEGMENT_ENTRY_LARGE   0x400   /* STE-format control, large page   */
+#define _SEGMENT_ENTRY_CO      0x100   /* change-recording override   */
+
 #endif /* __s390x__ */
 
 /*
@@ -520,7 +534,7 @@ static inline int pte_file(pte_t pte)
 
 static inline int pte_special(pte_t pte)
 {
-       return 0;
+       return (pte_val(pte) & _PAGE_SPECIAL);
 }
 
 #define __HAVE_ARCH_PTE_SAME
@@ -722,6 +736,7 @@ static inline pte_t pte_mkyoung(pte_t pte)
 
 static inline pte_t pte_mkspecial(pte_t pte)
 {
+       pte_val(pte) |= _PAGE_SPECIAL;
        return pte;
 }