1 files changed, 67 insertions, 0 deletions

diff --git a/include/asm-sh/pgtable-2level.h b/include/asm-sh/pgtable-2level.h
new file mode 100644
index 000000000000..b0528aa3cb1f
--- /dev/null
+++ b/include/asm-sh/pgtable-2level.h
@@ -0,0 +1,67 @@
+#ifndef __ASM_SH_PGTABLE_2LEVEL_H
+#define __ASM_SH_PGTABLE_2LEVEL_H
+
+/*
+ * traditional two-level paging structure:
+ */
+
+#define PGDIR_SHIFT     22
+#define PTRS_PER_PGD    1024
+
+/*
+ * this is two-level, so we don't really have any
+ * PMD directory physically.
+ */
+#define PMD_SHIFT       22
+#define PTRS_PER_PMD    1
+
+#define PTRS_PER_PTE    1024
+
+#ifndef __ASSEMBLY__
+#define pte_ERROR(e) \
+        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
+#define pmd_ERROR(e) \
+        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
+#define pgd_ERROR(e) \
+        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+/*
+ * The "pgd_xxx()" functions here are trivial for a folded two-level
+ * setup: the pgd is never bad, and a pmd always exists (as it's folded
+ * into the pgd entry)
+ */
+static inline int pgd_none(pgd_t pgd)           { return 0; }
+static inline int pgd_bad(pgd_t pgd)            { return 0; }
+static inline int pgd_present(pgd_t pgd)        { return 1; }
+static inline void pgd_clear (pgd_t * pgdp)     { }
+
+/*
+ * Certain architectures need to do special things when PTEs
+ * within a page table are directly modified.  Thus, the following
+ * hook is made available.
+ */
+#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+/*
+ * (pmds are folded into pgds so this doesn't get actually called,
+ * but the define is needed for a generic inline function.)
+ */
+#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
+#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
+
+#define pgd_page(pgd) \
+((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
+
+static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
+{
+        return (pmd_t *) dir;
+}
+
+#define pte_pfn(x)              ((unsigned long)(((x).pte >> PAGE_SHIFT)))
+#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __ASM_SH_PGTABLE_2LEVEL_H */