1 files changed, 102 insertions, 0 deletions

diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
new file mode 100644
index 00000000000..79bf0acc40d
--- /dev/null
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -0,0 +1,102 @@
+/*
+ * arch/arm/include/asm/pgtable-3level.h
+ *
+ * Copyright (C) 2011 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#ifndef _ASM_PGTABLE_3LEVEL_H
+#define _ASM_PGTABLE_3LEVEL_H
+
+/*
+ * With LPAE, there are 3 levels of page tables. Each level has 512 entries of
+ * 8 bytes each, occupying a 4K page. The first level table covers a range of
+ * 512GB, each entry representing 1GB. Since we are limited to 4GB input
+ * address range, only 4 entries in the PGD are used.
+ *
+ * There are enough spare bits in a page table entry for the kernel specific
+ * state.
+ */
+#define PTRS_PER_PTE            512
+#define PTRS_PER_PMD            512
+#define PTRS_PER_PGD            4
+
+#define PTE_HWTABLE_PTRS        (PTRS_PER_PTE)
+#define PTE_HWTABLE_OFF         (0)
+#define PTE_HWTABLE_SIZE        (PTRS_PER_PTE * sizeof(u64))
+
+/*
+ * PGDIR_SHIFT determines the size a top-level page table entry can map.
+ */
+#define PGDIR_SHIFT             30
+
+/*
+ * PMD_SHIFT determines the size a middle-level page table entry can map.
+ */
+#define PMD_SHIFT               21
+
+#define PMD_SIZE                (1UL << PMD_SHIFT)
+#define PMD_MASK                (~(PMD_SIZE-1))
+#define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK              (~(PGDIR_SIZE-1))
+
+/*
+ * section address mask and size definitions.
+ */
+#define SECTION_SHIFT           21
+#define SECTION_SIZE            (1UL << SECTION_SHIFT)
+#define SECTION_MASK            (~(SECTION_SIZE-1))
+
+#define USER_PTRS_PER_PGD       (PAGE_OFFSET / PGDIR_SIZE)
+
+/*
+ * "Linux" PTE definitions for LPAE.
+ *
+ * These bits overlap with the hardware bits but the naming is preserved for
+ * consistency with the classic page table format.
+ */
+#define L_PTE_PRESENT           (_AT(pteval_t, 3) << 0)         /* Valid */
+#define L_PTE_FILE              (_AT(pteval_t, 1) << 2)         /* only when !PRESENT */
+#define L_PTE_BUFFERABLE        (_AT(pteval_t, 1) << 2)         /* AttrIndx[0] */
+#define L_PTE_CACHEABLE         (_AT(pteval_t, 1) << 3)         /* AttrIndx[1] */
+#define L_PTE_USER              (_AT(pteval_t, 1) << 6)         /* AP[1] */
+#define L_PTE_RDONLY            (_AT(pteval_t, 1) << 7)         /* AP[2] */
+#define L_PTE_SHARED            (_AT(pteval_t, 3) << 8)         /* SH[1:0], inner shareable */
+#define L_PTE_YOUNG             (_AT(pteval_t, 1) << 10)        /* AF */
+#define L_PTE_XN                (_AT(pteval_t, 1) << 54)        /* XN */
+#define L_PTE_DIRTY             (_AT(pteval_t, 1) << 55)        /* unused */
+#define L_PTE_SPECIAL           (_AT(pteval_t, 1) << 56)        /* unused */
+
+/*
+ * To be used in assembly code with the upper page attributes.
+ */
+#define L_PTE_XN_HIGH           (1 << (54 - 32))
+#define L_PTE_DIRTY_HIGH        (1 << (55 - 32))
+
+/*
+ * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
+ */
+#define L_PTE_MT_UNCACHED       (_AT(pteval_t, 0) << 2) /* strongly ordered */
+#define L_PTE_MT_BUFFERABLE     (_AT(pteval_t, 1) << 2) /* normal non-cacheable */
+#define L_PTE_MT_WRITETHROUGH   (_AT(pteval_t, 2) << 2) /* normal inner write-through */
+#define L_PTE_MT_WRITEBACK      (_AT(pteval_t, 3) << 2) /* normal inner write-back */
+#define L_PTE_MT_WRITEALLOC     (_AT(pteval_t, 7) << 2) /* normal inner write-alloc */
+#define L_PTE_MT_DEV_SHARED     (_AT(pteval_t, 4) << 2) /* device */
+#define L_PTE_MT_DEV_NONSHARED  (_AT(pteval_t, 4) << 2) /* device */
+#define L_PTE_MT_DEV_WC         (_AT(pteval_t, 1) << 2) /* normal non-cacheable */
+#define L_PTE_MT_DEV_CACHED     (_AT(pteval_t, 3) << 2) /* normal inner write-back */
+#define L_PTE_MT_MASK           (_AT(pteval_t, 7) << 2)
+
+#endif /* _ASM_PGTABLE_3LEVEL_H */