1 files changed, 173 insertions, 0 deletions

diff --git a/include/asm-um/pgtable-3level.h b/include/asm-um/pgtable-3level.h
new file mode 100644
index 000000000000..faf051c2c418
--- /dev/null
+++ b/include/asm-um/pgtable-3level.h
@@ -0,0 +1,173 @@
+/*
+ * Copyright 2003 PathScale Inc
+ * Derived from include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGTABLE_3LEVEL_H
+#define __UM_PGTABLE_3LEVEL_H
+
+#include <asm-generic/pgtable-nopud.h>
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+
+#define PGDIR_SHIFT     30
+#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE-1))
+
+/* PMD_SHIFT determines the size of the area a second-level page table can
+ * map
+ */
+
+#define PMD_SHIFT       21
+#define PMD_SIZE        (1UL << PMD_SHIFT)
+#define PMD_MASK        (~(PMD_SIZE-1))
+
+/*
+ * entries per page directory level
+ */
+
+#define PTRS_PER_PTE 512
+#define PTRS_PER_PMD 512
+#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
+#define PTRS_PER_PGD 512
+#define FIRST_USER_PGD_NR       0
+
+#define pte_ERROR(e) \
+        printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
+               pte_val(e))
+#define pmd_ERROR(e) \
+        printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
+               pmd_val(e))
+#define pgd_ERROR(e) \
+        printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
+               pgd_val(e))
+
+#define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
+#define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+#define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
+#define pud_populate(mm, pud, pmd) \
+        set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
+
+#define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval))
+static inline int pgd_newpage(pgd_t pgd)
+{
+        return(pgd_val(pgd) & _PAGE_NEWPAGE);
+}
+
+static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
+
+
+#define pte_present(x)  pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))
+
+static inline pte_t pte_mknewprot(pte_t pte)
+{
+        pte_set_bits(pte, _PAGE_NEWPROT);
+        return(pte);
+}
+
+static inline pte_t pte_mknewpage(pte_t pte)
+{
+        pte_set_bits(pte, _PAGE_NEWPAGE);
+        return(pte);
+}
+
+static inline void set_pte(pte_t *pteptr, pte_t pteval)
+{
+        pte_copy(*pteptr, 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(*pteptr);
+        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) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
+
+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+        pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
+
+        if(pmd)
+                memset(pmd, 0, PAGE_SIZE);
+
+        return pmd;
+}
+
+static inline void pmd_free(pmd_t *pmd){
+        free_page((unsigned long) pmd);
+}
+
+#define __pmd_free_tlb(tlb,x)   do { } while (0)
+
+static inline void pud_clear (pud_t * pud) { }
+
+#define pud_page(pud) \
+        ((struct page *) __va(pud_val(pud) & PAGE_MASK))
+
+/* Find an entry in the second-level page table.. */
+#define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
+                        pmd_index(address))
+
+#define pte_page(x) pfn_to_page(pte_pfn(x))
+
+static inline int pte_none(pte_t pte)
+{
+        return pte_is_zero(pte);
+}
+
+static inline unsigned long pte_pfn(pte_t pte)
+{
+        return phys_to_pfn(pte_val(pte));
+}
+
+static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
+{
+        pte_t pte;
+        phys_t phys = pfn_to_phys(page_nr);
+
+        pte_set_val(pte, phys, pgprot);
+        return pte;
+}
+
+static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
+{
+        return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
+}
+
+/*
+ * Bits 0 through 3 are taken in the low part of the pte,
+ * put the 32 bits of offset into the high part.
+ */
+#define PTE_FILE_MAX_BITS       32
+
+#ifdef CONFIG_64_BIT
+
+#define pte_to_pgoff(p) ((p).pte >> 32)
+
+#define pgoff_to_pte(off) ((pte_t) { ((off) < 32) | _PAGE_FILE })
+
+#else
+
+#define pte_to_pgoff(pte) ((pte).pte_high)
+
+#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
+
+#endif
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */