1 files changed, 83 insertions, 0 deletions
diff --git a/include/asm-um/pgtable-2level.h b/include/asm-um/pgtable-2level.h
new file mode 100644
index 00000000000..61eb2473424
--- /dev/null
+++ b/include/asm-um/pgtable-2level.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Derived from include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGTABLE_2LEVEL_H
+#define __UM_PGTABLE_2LEVEL_H
+
+#include <asm-generic/pgtable-nopmd.h>
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+
+#define PGDIR_SHIFT	22
+#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
+#define PGDIR_MASK	(~(PGDIR_SIZE-1))
+
+/*
+ * entries per page directory level: the i386 is two-level, so
+ * we don't really have any PMD directory physically.
+ */
+#define PTRS_PER_PTE	1024
+#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
+#define PTRS_PER_PGD	1024
+#define FIRST_USER_PGD_NR       0
+
+#define pte_ERROR(e) \
+        printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
+	       pte_val(e))
+#define pgd_ERROR(e) \
+        printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
+	       pgd_val(e))
+
+static inline int pgd_newpage(pgd_t pgd)	{ return 0; }
+static inline void pgd_mkuptodate(pgd_t pgd)	{ }
+
+#define pte_present(x)	(pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
+
+static inline pte_t pte_mknewprot(pte_t pte)
+{
+ 	pte_val(pte) |= _PAGE_NEWPROT;
+	return(pte);
+}
+
+static inline pte_t pte_mknewpage(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_NEWPAGE;
+	return(pte);
+}
+
+static inline void set_pte(pte_t *pteptr, pte_t 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(pteval);
+	if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
+}
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+
+#define pte_page(x) pfn_to_page(pte_pfn(x))
+#define pte_none(x) !(pte_val(x) & ~_PAGE_NEWPAGE)
+#define pte_pfn(x) phys_to_pfn(pte_val(x))
+#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
+#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
+
+#define pmd_page_kernel(pmd) \
+	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+
+/*
+ * Bits 0 through 3 are taken
+ */
+#define PTE_FILE_MAX_BITS	28
+
+#define pte_to_pgoff(pte) (pte_val(pte) >> 4)
+
+#define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE })
+
+#endif