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 /* 20 * Number of page-table levels required to address 'va_bits' wide 21 * address, without section mapping. We resolve the top (va_bits - PAGE_SHIFT) 22 * bits with (PAGE_SHIFT - 3) bits at each page table level. Hence: 23 * 24 * levels = DIV_ROUND_UP((va_bits - PAGE_SHIFT), (PAGE_SHIFT - 3)) 25 * 26 * where DIV_ROUND_UP(n, d) => (((n) + (d) - 1) / (d)) 27 * 28 * We cannot include linux/kernel.h which defines DIV_ROUND_UP here 29 * due to build issues. So we open code DIV_ROUND_UP here: 30 * 31 * ((((va_bits) - PAGE_SHIFT) + (PAGE_SHIFT - 3) - 1) / (PAGE_SHIFT - 3)) 32 * 33 * which gets simplified as : 34 */ 35 #define ARM64_HW_PGTABLE_LEVELS(va_bits) (((va_bits) - 4) / (PAGE_SHIFT - 3)) 36 37 /* 38 * Size mapped by an entry at level n ( 0 <= n <= 3) 39 * We map (PAGE_SHIFT - 3) at all translation levels and PAGE_SHIFT bits 40 * in the final page. The maximum number of translation levels supported by 41 * the architecture is 4. Hence, starting at at level n, we have further 42 * ((4 - n) - 1) levels of translation excluding the offset within the page. 43 * So, the total number of bits mapped by an entry at level n is : 44 * 45 * ((4 - n) - 1) * (PAGE_SHIFT - 3) + PAGE_SHIFT 46 * 47 * Rearranging it a bit we get : 48 * (4 - n) * (PAGE_SHIFT - 3) + 3 49 */ 50 #define ARM64_HW_PGTABLE_LEVEL_SHIFT(n) ((PAGE_SHIFT - 3) * (4 - (n)) + 3) 51 52 #define PTRS_PER_PTE (1 << (PAGE_SHIFT - 3)) 53 54 /* 55 * PMD_SHIFT determines the size a level 2 page table entry can map. 56 */ 57 #if CONFIG_PGTABLE_LEVELS > 2 58 #define PMD_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(2) 59 #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT) 60 #define PMD_MASK (~(PMD_SIZE-1)) 61 #define PTRS_PER_PMD PTRS_PER_PTE 62 #endif 63 64 /* 65 * PUD_SHIFT determines the size a level 1 page table entry can map. 66 */ 67 #if CONFIG_PGTABLE_LEVELS > 3 68 #define PUD_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(1) 69 #define PUD_SIZE (_AC(1, UL) << PUD_SHIFT) 70 #define PUD_MASK (~(PUD_SIZE-1)) 71 #define PTRS_PER_PUD PTRS_PER_PTE 72 #endif 73 74 /* 75 * PGDIR_SHIFT determines the size a top-level page table entry can map 76 * (depending on the configuration, this level can be 0, 1 or 2). 77 */ 78 #define PGDIR_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(4 - CONFIG_PGTABLE_LEVELS) 79 #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT) 80 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 81 #define PTRS_PER_PGD (1 << (VA_BITS - PGDIR_SHIFT)) 82 83 /* 84 * Section address mask and size definitions. 85 */ 86 #define SECTION_SHIFT PMD_SHIFT 87 #define SECTION_SIZE (_AC(1, UL) << SECTION_SHIFT) 88 #define SECTION_MASK (~(SECTION_SIZE-1)) 89 90 /* 91 * Contiguous page definitions. 92 */ 93 #ifdef CONFIG_ARM64_64K_PAGES 94 #define CONT_PTE_SHIFT 5 95 #define CONT_PMD_SHIFT 5 96 #elif defined(CONFIG_ARM64_16K_PAGES) 97 #define CONT_PTE_SHIFT 7 98 #define CONT_PMD_SHIFT 5 99 #else 100 #define CONT_PTE_SHIFT 4 101 #define CONT_PMD_SHIFT 4 102 #endif 103 104 #define CONT_PTES (1 << CONT_PTE_SHIFT) 105 #define CONT_PTE_SIZE (CONT_PTES * PAGE_SIZE) 106 #define CONT_PTE_MASK (~(CONT_PTE_SIZE - 1)) 107 #define CONT_PMDS (1 << CONT_PMD_SHIFT) 108 #define CONT_PMD_SIZE (CONT_PMDS * PMD_SIZE) 109 #define CONT_PMD_MASK (~(CONT_PMD_SIZE - 1)) 110 /* the the numerical offset of the PTE within a range of CONT_PTES */ 111 #define CONT_RANGE_OFFSET(addr) (((addr)>>PAGE_SHIFT)&(CONT_PTES-1)) 112 113 /* 114 * Hardware page table definitions. 115 * 116 * Level 1 descriptor (PUD). 117 */ 118 #define PUD_TYPE_TABLE (_AT(pudval_t, 3) << 0) 119 #define PUD_TABLE_BIT (_AT(pgdval_t, 1) << 1) 120 #define PUD_TYPE_MASK (_AT(pgdval_t, 3) << 0) 121 #define PUD_TYPE_SECT (_AT(pgdval_t, 1) << 0) 122 123 /* 124 * Level 2 descriptor (PMD). 125 */ 126 #define PMD_TYPE_MASK (_AT(pmdval_t, 3) << 0) 127 #define PMD_TYPE_FAULT (_AT(pmdval_t, 0) << 0) 128 #define PMD_TYPE_TABLE (_AT(pmdval_t, 3) << 0) 129 #define PMD_TYPE_SECT (_AT(pmdval_t, 1) << 0) 130 #define PMD_TABLE_BIT (_AT(pmdval_t, 1) << 1) 131 132 /* 133 * Section 134 */ 135 #define PMD_SECT_VALID (_AT(pmdval_t, 1) << 0) 136 #define PMD_SECT_USER (_AT(pmdval_t, 1) << 6) /* AP[1] */ 137 #define PMD_SECT_RDONLY (_AT(pmdval_t, 1) << 7) /* AP[2] */ 138 #define PMD_SECT_S (_AT(pmdval_t, 3) << 8) 139 #define PMD_SECT_AF (_AT(pmdval_t, 1) << 10) 140 #define PMD_SECT_NG (_AT(pmdval_t, 1) << 11) 141 #define PMD_SECT_CONT (_AT(pmdval_t, 1) << 52) 142 #define PMD_SECT_PXN (_AT(pmdval_t, 1) << 53) 143 #define PMD_SECT_UXN (_AT(pmdval_t, 1) << 54) 144 145 /* 146 * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers). 147 */ 148 #define PMD_ATTRINDX(t) (_AT(pmdval_t, (t)) << 2) 149 #define PMD_ATTRINDX_MASK (_AT(pmdval_t, 7) << 2) 150 151 /* 152 * Level 3 descriptor (PTE). 153 */ 154 #define PTE_TYPE_MASK (_AT(pteval_t, 3) << 0) 155 #define PTE_TYPE_FAULT (_AT(pteval_t, 0) << 0) 156 #define PTE_TYPE_PAGE (_AT(pteval_t, 3) << 0) 157 #define PTE_TABLE_BIT (_AT(pteval_t, 1) << 1) 158 #define PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */ 159 #define PTE_RDONLY (_AT(pteval_t, 1) << 7) /* AP[2] */ 160 #define PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */ 161 #define PTE_AF (_AT(pteval_t, 1) << 10) /* Access Flag */ 162 #define PTE_NG (_AT(pteval_t, 1) << 11) /* nG */ 163 #define PTE_DBM (_AT(pteval_t, 1) << 51) /* Dirty Bit Management */ 164 #define PTE_CONT (_AT(pteval_t, 1) << 52) /* Contiguous range */ 165 #define PTE_PXN (_AT(pteval_t, 1) << 53) /* Privileged XN */ 166 #define PTE_UXN (_AT(pteval_t, 1) << 54) /* User XN */ 167 168 /* 169 * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers). 170 */ 171 #define PTE_ATTRINDX(t) (_AT(pteval_t, (t)) << 2) 172 #define PTE_ATTRINDX_MASK (_AT(pteval_t, 7) << 2) 173 174 /* 175 * 2nd stage PTE definitions 176 */ 177 #define PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[2:1] */ 178 #define PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */ 179 180 #define PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[2:1] */ 181 #define PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */ 182 183 /* 184 * Memory Attribute override for Stage-2 (MemAttr[3:0]) 185 */ 186 #define PTE_S2_MEMATTR(t) (_AT(pteval_t, (t)) << 2) 187 #define PTE_S2_MEMATTR_MASK (_AT(pteval_t, 0xf) << 2) 188 189 /* 190 * EL2/HYP PTE/PMD definitions 191 */ 192 #define PMD_HYP PMD_SECT_USER 193 #define PTE_HYP PTE_USER 194 195 /* 196 * Highest possible physical address supported. 197 */ 198 #define PHYS_MASK_SHIFT (48) 199 #define PHYS_MASK ((UL(1) << PHYS_MASK_SHIFT) - 1) 200 201 /* 202 * TCR flags. 203 */ 204 #define TCR_T0SZ_OFFSET 0 205 #define TCR_T1SZ_OFFSET 16 206 #define TCR_T0SZ(x) ((UL(64) - (x)) << TCR_T0SZ_OFFSET) 207 #define TCR_T1SZ(x) ((UL(64) - (x)) << TCR_T1SZ_OFFSET) 208 #define TCR_TxSZ(x) (TCR_T0SZ(x) | TCR_T1SZ(x)) 209 #define TCR_TxSZ_WIDTH 6 210 #define TCR_IRGN_NC ((UL(0) << 8) | (UL(0) << 24)) 211 #define TCR_IRGN_WBWA ((UL(1) << 8) | (UL(1) << 24)) 212 #define TCR_IRGN_WT ((UL(2) << 8) | (UL(2) << 24)) 213 #define TCR_IRGN_WBnWA ((UL(3) << 8) | (UL(3) << 24)) 214 #define TCR_IRGN_MASK ((UL(3) << 8) | (UL(3) << 24)) 215 #define TCR_ORGN_NC ((UL(0) << 10) | (UL(0) << 26)) 216 #define TCR_ORGN_WBWA ((UL(1) << 10) | (UL(1) << 26)) 217 #define TCR_ORGN_WT ((UL(2) << 10) | (UL(2) << 26)) 218 #define TCR_ORGN_WBnWA ((UL(3) << 10) | (UL(3) << 26)) 219 #define TCR_ORGN_MASK ((UL(3) << 10) | (UL(3) << 26)) 220 #define TCR_SHARED ((UL(3) << 12) | (UL(3) << 28)) 221 #define TCR_TG0_4K (UL(0) << 14) 222 #define TCR_TG0_64K (UL(1) << 14) 223 #define TCR_TG0_16K (UL(2) << 14) 224 #define TCR_TG1_16K (UL(1) << 30) 225 #define TCR_TG1_4K (UL(2) << 30) 226 #define TCR_TG1_64K (UL(3) << 30) 227 228 #define TCR_A1 (UL(1) << 22) 229 #define TCR_ASID16 (UL(1) << 36) 230 #define TCR_TBI0 (UL(1) << 37) 231 #define TCR_HA (UL(1) << 39) 232 #define TCR_HD (UL(1) << 40) 233 234 #endif 235