1 /* 2 * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arch.h> 8 #include <arch_helpers.h> 9 #include <assert.h> 10 #include <bl_common.h> 11 #include <cassert.h> 12 #include <common_def.h> 13 #include <platform_def.h> 14 #include <sys/types.h> 15 #include <utils.h> 16 #include <xlat_tables.h> 17 #include "../xlat_tables_private.h" 18 19 /* 20 * Each platform can define the size of the virtual address space, which is 21 * defined in PLAT_VIRT_ADDR_SPACE_SIZE. TCR.TxSZ is calculated as 64 minus the 22 * width of said address space. The value of TCR.TxSZ must be in the range 16 23 * to 39 [1], which means that the virtual address space width must be in the 24 * range 48 to 25 bits. 25 * 26 * Here we calculate the initial lookup level from the value of 27 * PLAT_VIRT_ADDR_SPACE_SIZE. For a 4 KB page size, level 0 supports virtual 28 * address spaces of widths 48 to 40 bits, level 1 from 39 to 31, and level 2 29 * from 30 to 25. Wider or narrower address spaces are not supported. As a 30 * result, level 3 cannot be used as initial lookup level with 4 KB 31 * granularity. [2] 32 * 33 * For example, for a 35-bit address space (i.e. PLAT_VIRT_ADDR_SPACE_SIZE == 34 * 1 << 35), TCR.TxSZ will be programmed to (64 - 35) = 29. According to Table 35 * D4-11 in the ARM ARM, the initial lookup level for an address space like 36 * that is 1. 37 * 38 * See the ARMv8-A Architecture Reference Manual (DDI 0487A.j) for more 39 * information: 40 * [1] Page 1730: 'Input address size', 'For all translation stages'. 41 * [2] Section D4.2.5 42 */ 43 44 #if PLAT_VIRT_ADDR_SPACE_SIZE > (1ULL << (64 - TCR_TxSZ_MIN)) 45 46 # error "PLAT_VIRT_ADDR_SPACE_SIZE is too big." 47 48 #elif PLAT_VIRT_ADDR_SPACE_SIZE > (1ULL << L0_XLAT_ADDRESS_SHIFT) 49 50 # define XLAT_TABLE_LEVEL_BASE 0 51 # define NUM_BASE_LEVEL_ENTRIES \ 52 (PLAT_VIRT_ADDR_SPACE_SIZE >> L0_XLAT_ADDRESS_SHIFT) 53 54 #elif PLAT_VIRT_ADDR_SPACE_SIZE > (1 << L1_XLAT_ADDRESS_SHIFT) 55 56 # define XLAT_TABLE_LEVEL_BASE 1 57 # define NUM_BASE_LEVEL_ENTRIES \ 58 (PLAT_VIRT_ADDR_SPACE_SIZE >> L1_XLAT_ADDRESS_SHIFT) 59 60 #elif PLAT_VIRT_ADDR_SPACE_SIZE >= (1 << (64 - TCR_TxSZ_MAX)) 61 62 # define XLAT_TABLE_LEVEL_BASE 2 63 # define NUM_BASE_LEVEL_ENTRIES \ 64 (PLAT_VIRT_ADDR_SPACE_SIZE >> L2_XLAT_ADDRESS_SHIFT) 65 66 #else 67 68 # error "PLAT_VIRT_ADDR_SPACE_SIZE is too small." 69 70 #endif 71 72 static uint64_t base_xlation_table[NUM_BASE_LEVEL_ENTRIES] 73 __aligned(NUM_BASE_LEVEL_ENTRIES * sizeof(uint64_t)); 74 75 static unsigned long long tcr_ps_bits; 76 77 static unsigned long long calc_physical_addr_size_bits( 78 unsigned long long max_addr) 79 { 80 /* Physical address can't exceed 48 bits */ 81 assert((max_addr & ADDR_MASK_48_TO_63) == 0); 82 83 /* 48 bits address */ 84 if (max_addr & ADDR_MASK_44_TO_47) 85 return TCR_PS_BITS_256TB; 86 87 /* 44 bits address */ 88 if (max_addr & ADDR_MASK_42_TO_43) 89 return TCR_PS_BITS_16TB; 90 91 /* 42 bits address */ 92 if (max_addr & ADDR_MASK_40_TO_41) 93 return TCR_PS_BITS_4TB; 94 95 /* 40 bits address */ 96 if (max_addr & ADDR_MASK_36_TO_39) 97 return TCR_PS_BITS_1TB; 98 99 /* 36 bits address */ 100 if (max_addr & ADDR_MASK_32_TO_35) 101 return TCR_PS_BITS_64GB; 102 103 return TCR_PS_BITS_4GB; 104 } 105 106 #if ENABLE_ASSERTIONS 107 /* Physical Address ranges supported in the AArch64 Memory Model */ 108 static const unsigned int pa_range_bits_arr[] = { 109 PARANGE_0000, PARANGE_0001, PARANGE_0010, PARANGE_0011, PARANGE_0100, 110 PARANGE_0101 111 }; 112 113 static unsigned long long get_max_supported_pa(void) 114 { 115 u_register_t pa_range = read_id_aa64mmfr0_el1() & 116 ID_AA64MMFR0_EL1_PARANGE_MASK; 117 118 /* All other values are reserved */ 119 assert(pa_range < ARRAY_SIZE(pa_range_bits_arr)); 120 121 return (1ULL << pa_range_bits_arr[pa_range]) - 1ULL; 122 } 123 #endif /* ENABLE_ASSERTIONS */ 124 125 int xlat_arch_current_el(void) 126 { 127 int el = GET_EL(read_CurrentEl()); 128 129 assert(el > 0); 130 131 return el; 132 } 133 134 uint64_t xlat_arch_get_xn_desc(int el) 135 { 136 if (el == 3) { 137 return UPPER_ATTRS(XN); 138 } else { 139 assert(el == 1); 140 return UPPER_ATTRS(PXN); 141 } 142 } 143 144 void init_xlat_tables(void) 145 { 146 unsigned long long max_pa; 147 uintptr_t max_va; 148 print_mmap(); 149 init_xlation_table(0, base_xlation_table, XLAT_TABLE_LEVEL_BASE, 150 &max_va, &max_pa); 151 152 assert(max_va <= PLAT_VIRT_ADDR_SPACE_SIZE - 1); 153 assert(max_pa <= PLAT_PHY_ADDR_SPACE_SIZE - 1); 154 assert((PLAT_PHY_ADDR_SPACE_SIZE - 1) <= get_max_supported_pa()); 155 156 tcr_ps_bits = calc_physical_addr_size_bits(max_pa); 157 } 158 159 /******************************************************************************* 160 * Macro generating the code for the function enabling the MMU in the given 161 * exception level, assuming that the pagetables have already been created. 162 * 163 * _el: Exception level at which the function will run 164 * _tcr_extra: Extra bits to set in the TCR register. This mask will 165 * be OR'ed with the default TCR value. 166 * _tlbi_fct: Function to invalidate the TLBs at the current 167 * exception level 168 ******************************************************************************/ 169 #define DEFINE_ENABLE_MMU_EL(_el, _tcr_extra, _tlbi_fct) \ 170 void enable_mmu_el##_el(unsigned int flags) \ 171 { \ 172 uint64_t mair, tcr, ttbr; \ 173 uint32_t sctlr; \ 174 \ 175 assert(IS_IN_EL(_el)); \ 176 assert((read_sctlr_el##_el() & SCTLR_M_BIT) == 0); \ 177 \ 178 /* Set attributes in the right indices of the MAIR */ \ 179 mair = MAIR_ATTR_SET(ATTR_DEVICE, ATTR_DEVICE_INDEX); \ 180 mair |= MAIR_ATTR_SET(ATTR_IWBWA_OWBWA_NTR, \ 181 ATTR_IWBWA_OWBWA_NTR_INDEX); \ 182 mair |= MAIR_ATTR_SET(ATTR_NON_CACHEABLE, \ 183 ATTR_NON_CACHEABLE_INDEX); \ 184 write_mair_el##_el(mair); \ 185 \ 186 /* Invalidate TLBs at the current exception level */ \ 187 _tlbi_fct(); \ 188 \ 189 /* Set TCR bits as well. */ \ 190 /* Set T0SZ to (64 - width of virtual address space) */ \ 191 if (flags & XLAT_TABLE_NC) { \ 192 /* Inner & outer non-cacheable non-shareable. */\ 193 tcr = TCR_SH_NON_SHAREABLE | \ 194 TCR_RGN_OUTER_NC | TCR_RGN_INNER_NC | \ 195 (64 - __builtin_ctzl(PLAT_VIRT_ADDR_SPACE_SIZE));\ 196 } else { \ 197 /* Inner & outer WBWA & shareable. */ \ 198 tcr = TCR_SH_INNER_SHAREABLE | \ 199 TCR_RGN_OUTER_WBA | TCR_RGN_INNER_WBA | \ 200 (64 - __builtin_ctzl(PLAT_VIRT_ADDR_SPACE_SIZE));\ 201 } \ 202 tcr |= _tcr_extra; \ 203 write_tcr_el##_el(tcr); \ 204 \ 205 /* Set TTBR bits as well */ \ 206 ttbr = (uint64_t) base_xlation_table; \ 207 write_ttbr0_el##_el(ttbr); \ 208 \ 209 /* Ensure all translation table writes have drained */ \ 210 /* into memory, the TLB invalidation is complete, */ \ 211 /* and translation register writes are committed */ \ 212 /* before enabling the MMU */ \ 213 dsbish(); \ 214 isb(); \ 215 \ 216 sctlr = read_sctlr_el##_el(); \ 217 sctlr |= SCTLR_WXN_BIT | SCTLR_M_BIT; \ 218 \ 219 if (flags & DISABLE_DCACHE) \ 220 sctlr &= ~SCTLR_C_BIT; \ 221 else \ 222 sctlr |= SCTLR_C_BIT; \ 223 \ 224 write_sctlr_el##_el(sctlr); \ 225 \ 226 /* Ensure the MMU enable takes effect immediately */ \ 227 isb(); \ 228 } 229 230 /* Define EL1 and EL3 variants of the function enabling the MMU */ 231 DEFINE_ENABLE_MMU_EL(1, 232 (tcr_ps_bits << TCR_EL1_IPS_SHIFT), 233 tlbivmalle1) 234 DEFINE_ENABLE_MMU_EL(3, 235 TCR_EL3_RES1 | (tcr_ps_bits << TCR_EL3_PS_SHIFT), 236 tlbialle3) 237