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 308