arch/arm64/include/asm/pgtable-hwdef.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_PGTABLE_HWDEF_H
  17 #define __ASM_PGTABLE_HWDEF_H
  18
  19 #include <asm/memory.h>
  20
  21 /*
  22  * Number of page-table levels required to address 'va_bits' wide
  23  * address, without section mapping. We resolve the top (va_bits - PAGE_SHIFT)
  24  * bits with (PAGE_SHIFT - 3) bits at each page table level. Hence:
  25  *
  26  *  levels = DIV_ROUND_UP((va_bits - PAGE_SHIFT), (PAGE_SHIFT - 3))
  27  *
  28  * where DIV_ROUND_UP(n, d) => (((n) + (d) - 1) / (d))
  29  *
  30  * We cannot include linux/kernel.h which defines DIV_ROUND_UP here
  31  * due to build issues. So we open code DIV_ROUND_UP here:
  32  *
  33  *      ((((va_bits) - PAGE_SHIFT) + (PAGE_SHIFT - 3) - 1) / (PAGE_SHIFT - 3))
  34  *
  35  * which gets simplified as :
  36  */
  37 #define ARM64_HW_PGTABLE_LEVELS(va_bits) (((va_bits) - 4) / (PAGE_SHIFT - 3))
  38
  39 /*
  40  * Size mapped by an entry at level n ( 0 <= n <= 3)
  41  * We map (PAGE_SHIFT - 3) at all translation levels and PAGE_SHIFT bits
  42  * in the final page. The maximum number of translation levels supported by
  43  * the architecture is 4. Hence, starting at at level n, we have further
  44  * ((4 - n) - 1) levels of translation excluding the offset within the page.
  45  * So, the total number of bits mapped by an entry at level n is :
  46  *
  47  *  ((4 - n) - 1) * (PAGE_SHIFT - 3) + PAGE_SHIFT
  48  *
  49  * Rearranging it a bit we get :
  50  *   (4 - n) * (PAGE_SHIFT - 3) + 3
  51  */
  52 #define ARM64_HW_PGTABLE_LEVEL_SHIFT(n) ((PAGE_SHIFT - 3) * (4 - (n)) + 3)
  53
  54 #define PTRS_PER_PTE            (1 << (PAGE_SHIFT - 3))
  55
  56 /*
  57  * PMD_SHIFT determines the size a level 2 page table entry can map.
  58  */
  59 #if CONFIG_PGTABLE_LEVELS > 2
  60 #define PMD_SHIFT               ARM64_HW_PGTABLE_LEVEL_SHIFT(2)
  61 #define PMD_SIZE                (_AC(1, UL) << PMD_SHIFT)
  62 #define PMD_MASK                (~(PMD_SIZE-1))
  63 #define PTRS_PER_PMD            PTRS_PER_PTE
  64 #endif
  65
  66 /*
  67  * PUD_SHIFT determines the size a level 1 page table entry can map.
  68  */
  69 #if CONFIG_PGTABLE_LEVELS > 3
  70 #define PUD_SHIFT               ARM64_HW_PGTABLE_LEVEL_SHIFT(1)
  71 #define PUD_SIZE                (_AC(1, UL) << PUD_SHIFT)
  72 #define PUD_MASK                (~(PUD_SIZE-1))
  73 #define PTRS_PER_PUD            PTRS_PER_PTE
  74 #endif
  75
  76 /*
  77  * PGDIR_SHIFT determines the size a top-level page table entry can map
  78  * (depending on the configuration, this level can be 0, 1 or 2).
  79  */
  80 #define PGDIR_SHIFT             ARM64_HW_PGTABLE_LEVEL_SHIFT(4 - CONFIG_PGTABLE_LEVELS)
  81 #define PGDIR_SIZE              (_AC(1, UL) << PGDIR_SHIFT)
  82 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
  83 #define PTRS_PER_PGD            (1 << (VA_BITS - PGDIR_SHIFT))
  84
  85 /*
  86  * Section address mask and size definitions.
  87  */
  88 #define SECTION_SHIFT           PMD_SHIFT
  89 #define SECTION_SIZE            (_AC(1, UL) << SECTION_SHIFT)
  90 #define SECTION_MASK            (~(SECTION_SIZE-1))
  91
  92 /*
  93  * Contiguous page definitions.
  94  */
  95 #ifdef CONFIG_ARM64_64K_PAGES
  96 #define CONT_PTE_SHIFT          5
  97 #define CONT_PMD_SHIFT          5
  98 #elif defined(CONFIG_ARM64_16K_PAGES)
  99 #define CONT_PTE_SHIFT          7
 100 #define CONT_PMD_SHIFT          5
 101 #else
 102 #define CONT_PTE_SHIFT          4
 103 #define CONT_PMD_SHIFT          4
 104 #endif
 105
 106 #define CONT_PTES               (1 << CONT_PTE_SHIFT)
 107 #define CONT_PTE_SIZE           (CONT_PTES * PAGE_SIZE)
 108 #define CONT_PTE_MASK           (~(CONT_PTE_SIZE - 1))
 109 #define CONT_PMDS               (1 << CONT_PMD_SHIFT)
 110 #define CONT_PMD_SIZE           (CONT_PMDS * PMD_SIZE)
 111 #define CONT_PMD_MASK           (~(CONT_PMD_SIZE - 1))
 112 /* the the numerical offset of the PTE within a range of CONT_PTES */
 113 #define CONT_RANGE_OFFSET(addr) (((addr)>>PAGE_SHIFT)&(CONT_PTES-1))
 114
 115 /*
 116  * Hardware page table definitions.
 117  *
 118  * Level 1 descriptor (PUD).
 119  */
 120 #define PUD_TYPE_TABLE          (_AT(pudval_t, 3) << 0)
 121 #define PUD_TABLE_BIT           (_AT(pudval_t, 1) << 1)
 122 #define PUD_TYPE_MASK           (_AT(pudval_t, 3) << 0)
 123 #define PUD_TYPE_SECT           (_AT(pudval_t, 1) << 0)
 124
 125 /*
 126  * Level 2 descriptor (PMD).
 127  */
 128 #define PMD_TYPE_MASK           (_AT(pmdval_t, 3) << 0)
 129 #define PMD_TYPE_FAULT          (_AT(pmdval_t, 0) << 0)
 130 #define PMD_TYPE_TABLE          (_AT(pmdval_t, 3) << 0)
 131 #define PMD_TYPE_SECT           (_AT(pmdval_t, 1) << 0)
 132 #define PMD_TABLE_BIT           (_AT(pmdval_t, 1) << 1)
 133
 134 /*
 135  * Section
 136  */
 137 #define PMD_SECT_VALID          (_AT(pmdval_t, 1) << 0)
 138 #define PMD_SECT_USER           (_AT(pmdval_t, 1) << 6)         /* AP[1] */
 139 #define PMD_SECT_RDONLY         (_AT(pmdval_t, 1) << 7)         /* AP[2] */
 140 #define PMD_SECT_S              (_AT(pmdval_t, 3) << 8)
 141 #define PMD_SECT_AF             (_AT(pmdval_t, 1) << 10)
 142 #define PMD_SECT_NG             (_AT(pmdval_t, 1) << 11)
 143 #define PMD_SECT_CONT           (_AT(pmdval_t, 1) << 52)
 144 #define PMD_SECT_PXN            (_AT(pmdval_t, 1) << 53)
 145 #define PMD_SECT_UXN            (_AT(pmdval_t, 1) << 54)
 146
 147 /*
 148  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
 149  */
 150 #define PMD_ATTRINDX(t)         (_AT(pmdval_t, (t)) << 2)
 151 #define PMD_ATTRINDX_MASK       (_AT(pmdval_t, 7) << 2)
 152
 153 /*
 154  * Level 3 descriptor (PTE).
 155  */
 156 #define PTE_TYPE_MASK           (_AT(pteval_t, 3) << 0)
 157 #define PTE_TYPE_FAULT          (_AT(pteval_t, 0) << 0)
 158 #define PTE_TYPE_PAGE           (_AT(pteval_t, 3) << 0)
 159 #define PTE_TABLE_BIT           (_AT(pteval_t, 1) << 1)
 160 #define PTE_USER                (_AT(pteval_t, 1) << 6)         /* AP[1] */
 161 #define PTE_RDONLY              (_AT(pteval_t, 1) << 7)         /* AP[2] */
 162 #define PTE_SHARED              (_AT(pteval_t, 3) << 8)         /* SH[1:0], inner shareable */
 163 #define PTE_AF                  (_AT(pteval_t, 1) << 10)        /* Access Flag */
 164 #define PTE_NG                  (_AT(pteval_t, 1) << 11)        /* nG */
 165 #define PTE_DBM                 (_AT(pteval_t, 1) << 51)        /* Dirty Bit Management */
 166 #define PTE_CONT                (_AT(pteval_t, 1) << 52)        /* Contiguous range */
 167 #define PTE_PXN                 (_AT(pteval_t, 1) << 53)        /* Privileged XN */
 168 #define PTE_UXN                 (_AT(pteval_t, 1) << 54)        /* User XN */
 169 #define PTE_HYP_XN              (_AT(pteval_t, 1) << 54)        /* HYP XN */
 170
 171 #define PTE_ADDR_LOW            (((_AT(pteval_t, 1) << (48 - PAGE_SHIFT)) - 1) << PAGE_SHIFT)
 172 #ifdef CONFIG_ARM64_PA_BITS_52
 173 #define PTE_ADDR_HIGH           (_AT(pteval_t, 0xf) << 12)
 174 #define PTE_ADDR_MASK           (PTE_ADDR_LOW | PTE_ADDR_HIGH)
 175 #else
 176 #define PTE_ADDR_MASK           PTE_ADDR_LOW
 177 #endif
 178
 179 /*
 180  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
 181  */
 182 #define PTE_ATTRINDX(t)         (_AT(pteval_t, (t)) << 2)
 183 #define PTE_ATTRINDX_MASK       (_AT(pteval_t, 7) << 2)
 184
 185 /*
 186  * 2nd stage PTE definitions
 187  */
 188 #define PTE_S2_RDONLY           (_AT(pteval_t, 1) << 6)   /* HAP[2:1] */
 189 #define PTE_S2_RDWR             (_AT(pteval_t, 3) << 6)   /* HAP[2:1] */
 190 #define PTE_S2_XN               (_AT(pteval_t, 2) << 53)  /* XN[1:0] */
 191
 192 #define PMD_S2_RDONLY           (_AT(pmdval_t, 1) << 6)   /* HAP[2:1] */
 193 #define PMD_S2_RDWR             (_AT(pmdval_t, 3) << 6)   /* HAP[2:1] */
 194 #define PMD_S2_XN               (_AT(pmdval_t, 2) << 53)  /* XN[1:0] */
 195
 196 /*
 197  * Memory Attribute override for Stage-2 (MemAttr[3:0])
 198  */
 199 #define PTE_S2_MEMATTR(t)       (_AT(pteval_t, (t)) << 2)
 200 #define PTE_S2_MEMATTR_MASK     (_AT(pteval_t, 0xf) << 2)
 201
 202 /*
 203  * EL2/HYP PTE/PMD definitions
 204  */
 205 #define PMD_HYP                 PMD_SECT_USER
 206 #define PTE_HYP                 PTE_USER
 207
 208 /*
 209  * Highest possible physical address supported.
 210  */
 211 #define PHYS_MASK_SHIFT         (CONFIG_ARM64_PA_BITS)
 212 #define PHYS_MASK               ((UL(1) << PHYS_MASK_SHIFT) - 1)
 213
 214 /*
 215  * TCR flags.
 216  */
 217 #define TCR_T0SZ_OFFSET         0
 218 #define TCR_T1SZ_OFFSET         16
 219 #define TCR_T0SZ(x)             ((UL(64) - (x)) << TCR_T0SZ_OFFSET)
 220 #define TCR_T1SZ(x)             ((UL(64) - (x)) << TCR_T1SZ_OFFSET)
 221 #define TCR_TxSZ(x)             (TCR_T0SZ(x) | TCR_T1SZ(x))
 222 #define TCR_TxSZ_WIDTH          6
 223 #define TCR_T0SZ_MASK           (((UL(1) << TCR_TxSZ_WIDTH) - 1) << TCR_T0SZ_OFFSET)
 224
 225 #define TCR_IRGN0_SHIFT         8
 226 #define TCR_IRGN0_MASK          (UL(3) << TCR_IRGN0_SHIFT)
 227 #define TCR_IRGN0_NC            (UL(0) << TCR_IRGN0_SHIFT)
 228 #define TCR_IRGN0_WBWA          (UL(1) << TCR_IRGN0_SHIFT)
 229 #define TCR_IRGN0_WT            (UL(2) << TCR_IRGN0_SHIFT)
 230 #define TCR_IRGN0_WBnWA         (UL(3) << TCR_IRGN0_SHIFT)
 231
 232 #define TCR_IRGN1_SHIFT         24
 233 #define TCR_IRGN1_MASK          (UL(3) << TCR_IRGN1_SHIFT)
 234 #define TCR_IRGN1_NC            (UL(0) << TCR_IRGN1_SHIFT)
 235 #define TCR_IRGN1_WBWA          (UL(1) << TCR_IRGN1_SHIFT)
 236 #define TCR_IRGN1_WT            (UL(2) << TCR_IRGN1_SHIFT)
 237 #define TCR_IRGN1_WBnWA         (UL(3) << TCR_IRGN1_SHIFT)
 238
 239 #define TCR_IRGN_NC             (TCR_IRGN0_NC | TCR_IRGN1_NC)
 240 #define TCR_IRGN_WBWA           (TCR_IRGN0_WBWA | TCR_IRGN1_WBWA)
 241 #define TCR_IRGN_WT             (TCR_IRGN0_WT | TCR_IRGN1_WT)
 242 #define TCR_IRGN_WBnWA          (TCR_IRGN0_WBnWA | TCR_IRGN1_WBnWA)
 243 #define TCR_IRGN_MASK           (TCR_IRGN0_MASK | TCR_IRGN1_MASK)
 244
 245
 246 #define TCR_ORGN0_SHIFT         10
 247 #define TCR_ORGN0_MASK          (UL(3) << TCR_ORGN0_SHIFT)
 248 #define TCR_ORGN0_NC            (UL(0) << TCR_ORGN0_SHIFT)
 249 #define TCR_ORGN0_WBWA          (UL(1) << TCR_ORGN0_SHIFT)
 250 #define TCR_ORGN0_WT            (UL(2) << TCR_ORGN0_SHIFT)
 251 #define TCR_ORGN0_WBnWA         (UL(3) << TCR_ORGN0_SHIFT)
 252
 253 #define TCR_ORGN1_SHIFT         26
 254 #define TCR_ORGN1_MASK          (UL(3) << TCR_ORGN1_SHIFT)
 255 #define TCR_ORGN1_NC            (UL(0) << TCR_ORGN1_SHIFT)
 256 #define TCR_ORGN1_WBWA          (UL(1) << TCR_ORGN1_SHIFT)
 257 #define TCR_ORGN1_WT            (UL(2) << TCR_ORGN1_SHIFT)
 258 #define TCR_ORGN1_WBnWA         (UL(3) << TCR_ORGN1_SHIFT)
 259
 260 #define TCR_ORGN_NC             (TCR_ORGN0_NC | TCR_ORGN1_NC)
 261 #define TCR_ORGN_WBWA           (TCR_ORGN0_WBWA | TCR_ORGN1_WBWA)
 262 #define TCR_ORGN_WT             (TCR_ORGN0_WT | TCR_ORGN1_WT)
 263 #define TCR_ORGN_WBnWA          (TCR_ORGN0_WBnWA | TCR_ORGN1_WBnWA)
 264 #define TCR_ORGN_MASK           (TCR_ORGN0_MASK | TCR_ORGN1_MASK)
 265
 266 #define TCR_SH0_SHIFT           12
 267 #define TCR_SH0_MASK            (UL(3) << TCR_SH0_SHIFT)
 268 #define TCR_SH0_INNER           (UL(3) << TCR_SH0_SHIFT)
 269
 270 #define TCR_SH1_SHIFT           28
 271 #define TCR_SH1_MASK            (UL(3) << TCR_SH1_SHIFT)
 272 #define TCR_SH1_INNER           (UL(3) << TCR_SH1_SHIFT)
 273 #define TCR_SHARED              (TCR_SH0_INNER | TCR_SH1_INNER)
 274
 275 #define TCR_TG0_SHIFT           14
 276 #define TCR_TG0_MASK            (UL(3) << TCR_TG0_SHIFT)
 277 #define TCR_TG0_4K              (UL(0) << TCR_TG0_SHIFT)
 278 #define TCR_TG0_64K             (UL(1) << TCR_TG0_SHIFT)
 279 #define TCR_TG0_16K             (UL(2) << TCR_TG0_SHIFT)
 280
 281 #define TCR_TG1_SHIFT           30
 282 #define TCR_TG1_MASK            (UL(3) << TCR_TG1_SHIFT)
 283 #define TCR_TG1_16K             (UL(1) << TCR_TG1_SHIFT)
 284 #define TCR_TG1_4K              (UL(2) << TCR_TG1_SHIFT)
 285 #define TCR_TG1_64K             (UL(3) << TCR_TG1_SHIFT)
 286
 287 #define TCR_IPS_SHIFT           32
 288 #define TCR_IPS_MASK            (UL(7) << TCR_IPS_SHIFT)
 289 #define TCR_A1                  (UL(1) << 22)
 290 #define TCR_ASID16              (UL(1) << 36)
 291 #define TCR_TBI0                (UL(1) << 37)
 292 #define TCR_HA                  (UL(1) << 39)
 293 #define TCR_HD                  (UL(1) << 40)
 294 #define TCR_NFD1                (UL(1) << 54)
 295
 296 /*
 297  * TTBR.
 298  */
 299 #ifdef CONFIG_ARM64_PA_BITS_52
 300 /*
 301  * This should be GENMASK_ULL(47, 2).
 302  * TTBR_ELx[1] is RES0 in this configuration.
 303  */
 304 #define TTBR_BADDR_MASK_52      (((UL(1) << 46) - 1) << 2)
 305 #endif
 306
 307 #endif