1 files changed, 65 insertions, 0 deletions

diff --git a/include/asm-generic/pgtable-nopmd.h b/include/asm-generic/pgtable-nopmd.h
new file mode 100644
index 000000000000..c8d53ba20e19
--- /dev/null
+++ b/include/asm-generic/pgtable-nopmd.h
@@ -0,0 +1,65 @@
+#ifndef _PGTABLE_NOPMD_H
+#define _PGTABLE_NOPMD_H
+
+#ifndef __ASSEMBLY__
+
+#include <asm-generic/pgtable-nopud.h>
+
+#define __PAGETABLE_PMD_FOLDED
+
+/*
+ * Having the pmd type consist of a pud gets the size right, and allows
+ * us to conceptually access the pud entry that this pmd is folded into
+ * without casting.
+ */
+typedef struct { pud_t pud; } pmd_t;
+
+#define PMD_SHIFT       PUD_SHIFT
+#define PTRS_PER_PMD    1
+#define PMD_SIZE        (1UL << PMD_SHIFT)
+#define PMD_MASK        (~(PMD_SIZE-1))
+
+/*
+ * The "pud_xxx()" functions here are trivial for a folded two-level
+ * setup: the pmd is never bad, and a pmd always exists (as it's folded
+ * into the pud entry)
+ */
+static inline int pud_none(pud_t pud)           { return 0; }
+static inline int pud_bad(pud_t pud)            { return 0; }
+static inline int pud_present(pud_t pud)        { return 1; }
+static inline void pud_clear(pud_t *pud)        { }
+#define pmd_ERROR(pmd)                          (pud_ERROR((pmd).pud))
+
+#define pud_populate(mm, pmd, pte)              do { } while (0)
+
+/*
+ * (pmds are folded into puds so this doesn't get actually called,
+ * but the define is needed for a generic inline function.)
+ */
+#define set_pud(pudptr, pudval)                 set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
+
+static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
+{
+        return (pmd_t *)pud;
+}
+
+#define pmd_val(x)                              (pud_val((x).pud))
+#define __pmd(x)                                ((pmd_t) { __pud(x) } )
+
+#define pud_page(pud)                           (pmd_page((pmd_t){ pud }))
+#define pud_page_kernel(pud)                    (pmd_page_kernel((pmd_t){ pud }))
+
+/*
+ * allocating and freeing a pmd is trivial: the 1-entry pmd is
+ * inside the pud, so has no extra memory associated with it.
+ */
+#define pmd_alloc_one(mm, address)              NULL
+#define pmd_free(x)                             do { } while (0)
+#define __pmd_free_tlb(tlb, x)                  do { } while (0)
+
+#undef  pmd_addr_end
+#define pmd_addr_end(addr, end)                 (end)
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _PGTABLE_NOPMD_H */