/* 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
#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
#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__ */
/*
return (pte_val(pte) & mask) == _PAGE_TYPE_FILE;
}
+static inline int pte_special(pte_t pte)
+{
+ return (pte_val(pte) & _PAGE_SPECIAL);
+}
+
#define __HAVE_ARCH_PTE_SAME
#define pte_same(a,b) (pte_val(a) == pte_val(b))
return pte;
}
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+ pte_val(pte) |= _PAGE_SPECIAL;
+ return pte;
+}
+
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)