arch/arm/include/asm/pgtable-3level-hwdef.h

   1 /*
   2  * arch/arm/include/asm/pgtable-3level-hwdef.h
   3  *
   4  * Copyright (C) 2011 ARM Ltd.
   5  * Author: Catalin Marinas <catalin.marinas@arm.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20 #ifndef _ASM_PGTABLE_3LEVEL_HWDEF_H
  21 #define _ASM_PGTABLE_3LEVEL_HWDEF_H
  22
  23 /*
  24  * Hardware page table definitions.
  25  *
  26  * + Level 1/2 descriptor
  27  *   - common
  28  */
  29 #define PMD_TYPE_MASK           (_AT(pmdval_t, 3) << 0)
  30 #define PMD_TYPE_FAULT          (_AT(pmdval_t, 0) << 0)
  31 #define PMD_TYPE_TABLE          (_AT(pmdval_t, 3) << 0)
  32 #define PMD_TYPE_SECT           (_AT(pmdval_t, 1) << 0)
  33 #define PMD_TABLE_BIT           (_AT(pmdval_t, 1) << 1)
  34 #define PMD_BIT4                (_AT(pmdval_t, 0))
  35 #define PMD_DOMAIN(x)           (_AT(pmdval_t, 0))
  36 #define PMD_APTABLE_SHIFT       (61)
  37 #define PMD_APTABLE             (_AT(pgdval_t, 3) << PGD_APTABLE_SHIFT)
  38 #define PMD_PXNTABLE            (_AT(pgdval_t, 1) << 59)
  39
  40 /*
  41  *   - section
  42  */
  43 #define PMD_SECT_BUFFERABLE     (_AT(pmdval_t, 1) << 2)
  44 #define PMD_SECT_CACHEABLE      (_AT(pmdval_t, 1) << 3)
  45 #define PMD_SECT_USER           (_AT(pmdval_t, 1) << 6)         /* AP[1] */
  46 #define PMD_SECT_AP2            (_AT(pmdval_t, 1) << 7)         /* read only */
  47 #define PMD_SECT_S              (_AT(pmdval_t, 3) << 8)
  48 #define PMD_SECT_AF             (_AT(pmdval_t, 1) << 10)
  49 #define PMD_SECT_nG             (_AT(pmdval_t, 1) << 11)
  50 #define PMD_SECT_PXN            (_AT(pmdval_t, 1) << 53)
  51 #define PMD_SECT_XN             (_AT(pmdval_t, 1) << 54)
  52 #define PMD_SECT_AP_WRITE       (_AT(pmdval_t, 0))
  53 #define PMD_SECT_AP_READ        (_AT(pmdval_t, 0))
  54 #define PMD_SECT_AP1            (_AT(pmdval_t, 1) << 6)
  55 #define PMD_SECT_TEX(x)         (_AT(pmdval_t, 0))
  56
  57 /*
  58  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
  59  */
  60 #define PMD_SECT_UNCACHED       (_AT(pmdval_t, 0) << 2) /* strongly ordered */
  61 #define PMD_SECT_BUFFERED       (_AT(pmdval_t, 1) << 2) /* normal non-cacheable */
  62 #define PMD_SECT_WT             (_AT(pmdval_t, 2) << 2) /* normal inner write-through */
  63 #define PMD_SECT_WB             (_AT(pmdval_t, 3) << 2) /* normal inner write-back */
  64 #define PMD_SECT_WBWA           (_AT(pmdval_t, 7) << 2) /* normal inner write-alloc */
  65 #define PMD_SECT_CACHE_MASK     (_AT(pmdval_t, 7) << 2)
  66
  67 /*
  68  * + Level 3 descriptor (PTE)
  69  */
  70 #define PTE_TYPE_MASK           (_AT(pteval_t, 3) << 0)
  71 #define PTE_TYPE_FAULT          (_AT(pteval_t, 0) << 0)
  72 #define PTE_TYPE_PAGE           (_AT(pteval_t, 3) << 0)
  73 #define PTE_TABLE_BIT           (_AT(pteval_t, 1) << 1)
  74 #define PTE_BUFFERABLE          (_AT(pteval_t, 1) << 2)         /* AttrIndx[0] */
  75 #define PTE_CACHEABLE           (_AT(pteval_t, 1) << 3)         /* AttrIndx[1] */
  76 #define PTE_AP2                 (_AT(pteval_t, 1) << 7)         /* AP[2] */
  77 #define PTE_EXT_SHARED          (_AT(pteval_t, 3) << 8)         /* SH[1:0], inner shareable */
  78 #define PTE_EXT_AF              (_AT(pteval_t, 1) << 10)        /* Access Flag */
  79 #define PTE_EXT_NG              (_AT(pteval_t, 1) << 11)        /* nG */
  80 #define PTE_EXT_PXN             (_AT(pteval_t, 1) << 53)        /* PXN */
  81 #define PTE_EXT_XN              (_AT(pteval_t, 1) << 54)        /* XN */
  82
  83 /*
  84  * 40-bit physical address supported.
  85  */
  86 #define PHYS_MASK_SHIFT         (40)
  87 #define PHYS_MASK               ((1ULL << PHYS_MASK_SHIFT) - 1)
  88
  89 /*
  90  * TTBR0/TTBR1 split (PAGE_OFFSET):
  91  *   0x40000000: T0SZ = 2, T1SZ = 0 (not used)
  92  *   0x80000000: T0SZ = 0, T1SZ = 1
  93  *   0xc0000000: T0SZ = 0, T1SZ = 2
  94  *
  95  * Only use this feature if PHYS_OFFSET <= PAGE_OFFSET, otherwise
  96  * booting secondary CPUs would end up using TTBR1 for the identity
  97  * mapping set up in TTBR0.
  98  */
  99 #if defined CONFIG_VMSPLIT_2G
 100 #define TTBR1_OFFSET    16                      /* skip two L1 entries */
 101 #elif defined CONFIG_VMSPLIT_3G
 102 #define TTBR1_OFFSET    (4096 * (1 + 3))        /* only L2, skip pgd + 3*pmd */
 103 #else
 104 #define TTBR1_OFFSET    0
 105 #endif
 106
 107 #define TTBR1_SIZE      (((PAGE_OFFSET >> 30) - 1) << 16)
 108
 109 #endif