/* * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include #include #include #include #include #include #include #include #include #include #include "../xlat_tables_private.h" unsigned long long tcr_physical_addr_size_bits(unsigned long long max_addr) { /* Physical address can't exceed 48 bits */ assert((max_addr & ADDR_MASK_48_TO_63) == 0); /* 48 bits address */ if (max_addr & ADDR_MASK_44_TO_47) return TCR_PS_BITS_256TB; /* 44 bits address */ if (max_addr & ADDR_MASK_42_TO_43) return TCR_PS_BITS_16TB; /* 42 bits address */ if (max_addr & ADDR_MASK_40_TO_41) return TCR_PS_BITS_4TB; /* 40 bits address */ if (max_addr & ADDR_MASK_36_TO_39) return TCR_PS_BITS_1TB; /* 36 bits address */ if (max_addr & ADDR_MASK_32_TO_35) return TCR_PS_BITS_64GB; return TCR_PS_BITS_4GB; } #if ENABLE_ASSERTIONS /* * Physical Address ranges supported in the AArch64 Memory Model. Value 0b110 is * supported in ARMv8.2 onwards. */ static const unsigned int pa_range_bits_arr[] = { PARANGE_0000, PARANGE_0001, PARANGE_0010, PARANGE_0011, PARANGE_0100, PARANGE_0101, PARANGE_0110 }; unsigned long long xlat_arch_get_max_supported_pa(void) { u_register_t pa_range = read_id_aa64mmfr0_el1() & ID_AA64MMFR0_EL1_PARANGE_MASK; /* All other values are reserved */ assert(pa_range < ARRAY_SIZE(pa_range_bits_arr)); return (1ULL << pa_range_bits_arr[pa_range]) - 1ULL; } #endif /* ENABLE_ASSERTIONS*/ int is_mmu_enabled_ctx(const xlat_ctx_t *ctx) { if (ctx->xlat_regime == EL1_EL0_REGIME) { assert(xlat_arch_current_el() >= 1); return (read_sctlr_el1() & SCTLR_M_BIT) != 0; } else { assert(ctx->xlat_regime == EL3_REGIME); assert(xlat_arch_current_el() >= 3); return (read_sctlr_el3() & SCTLR_M_BIT) != 0; } } void xlat_arch_tlbi_va(uintptr_t va) { #if IMAGE_EL == 1 assert(IS_IN_EL(1)); xlat_arch_tlbi_va_regime(va, EL1_EL0_REGIME); #elif IMAGE_EL == 3 assert(IS_IN_EL(3)); xlat_arch_tlbi_va_regime(va, EL3_REGIME); #endif } void xlat_arch_tlbi_va_regime(uintptr_t va, xlat_regime_t xlat_regime) { /* * Ensure the translation table write has drained into memory before * invalidating the TLB entry. */ dsbishst(); /* * This function only supports invalidation of TLB entries for the EL3 * and EL1&0 translation regimes. * * Also, it is architecturally UNDEFINED to invalidate TLBs of a higher * exception level (see section D4.9.2 of the ARM ARM rev B.a). */ if (xlat_regime == EL1_EL0_REGIME) { assert(xlat_arch_current_el() >= 1); tlbivaae1is(TLBI_ADDR(va)); } else { assert(xlat_regime == EL3_REGIME); assert(xlat_arch_current_el() >= 3); tlbivae3is(TLBI_ADDR(va)); } } void xlat_arch_tlbi_va_sync(void) { /* * A TLB maintenance instruction can complete at any time after * it is issued, but is only guaranteed to be complete after the * execution of DSB by the PE that executed the TLB maintenance * instruction. After the TLB invalidate instruction is * complete, no new memory accesses using the invalidated TLB * entries will be observed by any observer of the system * domain. See section D4.8.2 of the ARMv8 (issue k), paragraph * "Ordering and completion of TLB maintenance instructions". */ dsbish(); /* * The effects of a completed TLB maintenance instruction are * only guaranteed to be visible on the PE that executed the * instruction after the execution of an ISB instruction by the * PE that executed the TLB maintenance instruction. */ isb(); } int xlat_arch_current_el(void) { int el = GET_EL(read_CurrentEl()); assert(el > 0); return el; } /******************************************************************************* * Macro generating the code for the function enabling the MMU in the given * exception level, assuming that the pagetables have already been created. * * _el: Exception level at which the function will run * _tlbi_fct: Function to invalidate the TLBs at the current * exception level ******************************************************************************/ #define DEFINE_ENABLE_MMU_EL(_el, _tlbi_fct) \ static void enable_mmu_internal_el##_el(int flags, \ uint64_t mair, \ uint64_t tcr, \ uint64_t ttbr) \ { \ uint32_t sctlr = read_sctlr_el##_el(); \ assert((sctlr & SCTLR_M_BIT) == 0); \ \ /* Invalidate TLBs at the current exception level */ \ _tlbi_fct(); \ \ write_mair_el##_el(mair); \ write_tcr_el##_el(tcr); \ \ /* Set TTBR bits as well */ \ if (ARM_ARCH_AT_LEAST(8, 2)) { \ /* Enable CnP bit so as to share page tables */ \ /* with all PEs. This is mandatory for */ \ /* ARMv8.2 implementations. */ \ ttbr |= TTBR_CNP_BIT; \ } \ write_ttbr0_el##_el(ttbr); \ \ /* Ensure all translation table writes have drained */ \ /* into memory, the TLB invalidation is complete, */ \ /* and translation register writes are committed */ \ /* before enabling the MMU */ \ dsbish(); \ isb(); \ \ sctlr |= SCTLR_WXN_BIT | SCTLR_M_BIT; \ if (flags & DISABLE_DCACHE) \ sctlr &= ~SCTLR_C_BIT; \ else \ sctlr |= SCTLR_C_BIT; \ \ write_sctlr_el##_el(sctlr); \ \ /* Ensure the MMU enable takes effect immediately */ \ isb(); \ } /* Define EL1 and EL3 variants of the function enabling the MMU */ #if IMAGE_EL == 1 DEFINE_ENABLE_MMU_EL(1, tlbivmalle1) #elif IMAGE_EL == 3 DEFINE_ENABLE_MMU_EL(3, tlbialle3) #endif void enable_mmu_arch(unsigned int flags, uint64_t *base_table, unsigned long long max_pa, uintptr_t max_va) { uint64_t mair, ttbr, tcr; /* Set attributes in the right indices of the MAIR. */ mair = MAIR_ATTR_SET(ATTR_DEVICE, ATTR_DEVICE_INDEX); mair |= MAIR_ATTR_SET(ATTR_IWBWA_OWBWA_NTR, ATTR_IWBWA_OWBWA_NTR_INDEX); mair |= MAIR_ATTR_SET(ATTR_NON_CACHEABLE, ATTR_NON_CACHEABLE_INDEX); ttbr = (uint64_t) base_table; /* * Set TCR bits as well. */ /* * Limit the input address ranges and memory region sizes translated * using TTBR0 to the given virtual address space size. */ assert(max_va < UINTPTR_MAX); uintptr_t virtual_addr_space_size = max_va + 1; assert(CHECK_VIRT_ADDR_SPACE_SIZE(virtual_addr_space_size)); /* * __builtin_ctzll(0) is undefined but here we are guaranteed that * virtual_addr_space_size is in the range [1,UINTPTR_MAX]. */ tcr = 64 - __builtin_ctzll(virtual_addr_space_size); /* * Set the cacheability and shareability attributes for memory * associated with translation table walks. */ if (flags & XLAT_TABLE_NC) { /* Inner & outer non-cacheable non-shareable. */ tcr |= TCR_SH_NON_SHAREABLE | TCR_RGN_OUTER_NC | TCR_RGN_INNER_NC; } else { /* Inner & outer WBWA & shareable. */ tcr |= TCR_SH_INNER_SHAREABLE | TCR_RGN_OUTER_WBA | TCR_RGN_INNER_WBA; } /* * It is safer to restrict the max physical address accessible by the * hardware as much as possible. */ unsigned long long tcr_ps_bits = tcr_physical_addr_size_bits(max_pa); #if IMAGE_EL == 1 assert(IS_IN_EL(1)); /* * TCR_EL1.EPD1: Disable translation table walk for addresses that are * translated using TTBR1_EL1. */ tcr |= TCR_EPD1_BIT | (tcr_ps_bits << TCR_EL1_IPS_SHIFT); enable_mmu_internal_el1(flags, mair, tcr, ttbr); #elif IMAGE_EL == 3 assert(IS_IN_EL(3)); tcr |= TCR_EL3_RES1 | (tcr_ps_bits << TCR_EL3_PS_SHIFT); enable_mmu_internal_el3(flags, mair, tcr, ttbr); #endif }