This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-m32r / pgtable-2level.h

diff --git a/include/asm-m32r/pgtable-2level.h b/include/asm-m32r/pgtable-2level.h
new file mode 100644 (file)
index 0000000..7755c2b
--- /dev/null
+++ b/include/asm-m32r/pgtable-2level.h
@@ -0,0 +1,77 @@
+#ifndef _ASM_M32R_PGTABLE_2LEVEL_H
+#define _ASM_M32R_PGTABLE_2LEVEL_H
+
+/* $Id$ */
+
+#include <linux/config.h>
+
+/*
+ * traditional M32R two-level paging structure:
+ */
+
+#define PGDIR_SHIFT    22
+#define PTRS_PER_PGD   1024
+
+/*
+ * the M32R 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
+
+#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; }
+#define pgd_clear(xp)                          do { } while (0)
+
+/*
+ * 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_atomic(pteptr, pteval) set_pte(pteptr, pteval)
+/*
+ * (pmds are folded into pgds so this doesnt 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 ptep_get_and_clear(xp) __pte(xchg(&(xp)->pte, 0))
+#define pte_same(a, b)         (pte_val(a) == pte_val(b))
+#define pte_page(x)            pfn_to_page(pte_pfn(x))
+#define pte_none(x)            (!pte_val(x))
+#define pte_pfn(x)             (pte_val(x) >> 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))
+
+/* M32R_FIXME : PTE_FILE_MAX_BITS, pte_to_pgoff, pgoff_to_pte */
+#define PTE_FILE_MAX_BITS      31
+#define pte_to_pgoff(pte)      (pte_val(pte) >> 1)
+#define pgoff_to_pte(off)      ((pte_t) { ((off) << 1) | _PAGE_FILE })
+
+#endif /* _ASM_M32R_PGTABLE_2LEVEL_H */
+