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

[linux-2.6.git] / include / asm-powerpc / pgtable-4k.h

diff --git a/include/asm-powerpc/pgtable-4k.h b/include/asm-powerpc/pgtable-4k.h
new file mode 100644 (file)
index 0000000..b2e1862
--- /dev/null
+++ b/include/asm-powerpc/pgtable-4k.h
@@ -0,0 +1,96 @@
+/*
+ * Entries per page directory level.  The PTE level must use a 64b record
+ * for each page table entry.  The PMD and PGD level use a 32b record for
+ * each entry by assuming that each entry is page aligned.
+ */
+#define PTE_INDEX_SIZE  9
+#define PMD_INDEX_SIZE  7
+#define PUD_INDEX_SIZE  7
+#define PGD_INDEX_SIZE  9
+
+#define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE)
+#define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE)
+#define PUD_TABLE_SIZE (sizeof(pud_t) << PUD_INDEX_SIZE)
+#define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
+
+#define PTRS_PER_PTE   (1 << PTE_INDEX_SIZE)
+#define PTRS_PER_PMD   (1 << PMD_INDEX_SIZE)
+#define PTRS_PER_PUD   (1 << PMD_INDEX_SIZE)
+#define PTRS_PER_PGD   (1 << PGD_INDEX_SIZE)
+
+/* PMD_SHIFT determines what a second-level page table entry can map */
+#define PMD_SHIFT      (PAGE_SHIFT + PTE_INDEX_SIZE)
+#define PMD_SIZE       (1UL << PMD_SHIFT)
+#define PMD_MASK       (~(PMD_SIZE-1))
+
+/* With 4k base page size, hugepage PTEs go at the PMD level */
+#define MIN_HUGEPTE_SHIFT      PMD_SHIFT
+
+/* PUD_SHIFT determines what a third-level page table entry can map */
+#define PUD_SHIFT      (PMD_SHIFT + PMD_INDEX_SIZE)
+#define PUD_SIZE       (1UL << PUD_SHIFT)
+#define PUD_MASK       (~(PUD_SIZE-1))
+
+/* PGDIR_SHIFT determines what a fourth-level page table entry can map */
+#define PGDIR_SHIFT    (PUD_SHIFT + PUD_INDEX_SIZE)
+#define PGDIR_SIZE     (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK     (~(PGDIR_SIZE-1))
+
+/* PTE bits */
+#define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
+#define _PAGE_GROUP_IX  0x7000 /* software: HPTE index within group */
+#define _PAGE_F_SECOND  _PAGE_SECONDARY
+#define _PAGE_F_GIX     _PAGE_GROUP_IX
+
+/* PTE flags to conserve for HPTE identification */
+#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \
+                        _PAGE_SECONDARY | _PAGE_GROUP_IX)
+
+/* PAGE_MASK gives the right answer below, but only by accident */
+/* It should be preserving the high 48 bits and then specifically */
+/* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
+#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | \
+                         _PAGE_HPTEFLAGS)
+
+/* Bits to mask out from a PMD to get to the PTE page */
+#define PMD_MASKED_BITS                0
+/* Bits to mask out from a PUD to get to the PMD page */
+#define PUD_MASKED_BITS                0
+/* Bits to mask out from a PGD to get to the PUD page */
+#define PGD_MASKED_BITS                0
+
+/* shift to put page number into pte */
+#define PTE_RPN_SHIFT  (17)
+
+#ifdef STRICT_MM_TYPECHECKS
+#define __real_pte(e,p)                ((real_pte_t){(e)})
+#define __rpte_to_pte(r)       ((r).pte)
+#else
+#define __real_pte(e,p)                (e)
+#define __rpte_to_pte(r)       (__pte(r))
+#endif
+#define __rpte_to_hidx(r,index)        (pte_val(__rpte_to_pte(r)) >> 12)
+
+#define pte_iterate_hashed_subpages(rpte, psize, va, index, shift)       \
+       do {                                                             \
+               index = 0;                                               \
+               shift = mmu_psize_defs[psize].shift;                     \
+
+#define pte_iterate_hashed_end() } while(0)
+
+/*
+ * 4-level page tables related bits
+ */
+
+#define pgd_none(pgd)          (!pgd_val(pgd))
+#define pgd_bad(pgd)           (pgd_val(pgd) == 0)
+#define pgd_present(pgd)       (pgd_val(pgd) != 0)
+#define pgd_clear(pgdp)                (pgd_val(*(pgdp)) = 0)
+#define pgd_page(pgd)          (pgd_val(pgd) & ~PGD_MASKED_BITS)
+
+#define pud_offset(pgdp, addr) \
+  (((pud_t *) pgd_page(*(pgdp))) + \
+    (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))
+
+#define pud_ERROR(e) \
+       printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))