/* * Copyright (c) 2014-2024, 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" #define XLAT_TABLE_LEVEL_BASE \ GET_XLAT_TABLE_LEVEL_BASE(PLAT_VIRT_ADDR_SPACE_SIZE) #define NUM_BASE_LEVEL_ENTRIES \ GET_NUM_BASE_LEVEL_ENTRIES(PLAT_VIRT_ADDR_SPACE_SIZE) static uint64_t base_xlation_table[NUM_BASE_LEVEL_ENTRIES] __aligned(NUM_BASE_LEVEL_ENTRIES * sizeof(uint64_t)); static unsigned long long tcr_ps_bits; static unsigned long long calc_physical_addr_size_bits( unsigned long long max_addr) { /* Physical address can't exceed 48 bits */ assert((max_addr & ADDR_MASK_48_TO_63) == 0U); /* 48 bits address */ if ((max_addr & ADDR_MASK_44_TO_47) != 0U) return TCR_PS_BITS_256TB; /* 44 bits address */ if ((max_addr & ADDR_MASK_42_TO_43) != 0U) return TCR_PS_BITS_16TB; /* 42 bits address */ if ((max_addr & ADDR_MASK_40_TO_41) != 0U) return TCR_PS_BITS_4TB; /* 40 bits address */ if ((max_addr & ADDR_MASK_36_TO_39) != 0U) return TCR_PS_BITS_1TB; /* 36 bits address */ if ((max_addr & ADDR_MASK_32_TO_35) != 0U) 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, PARANGE_0111 }; static unsigned long long 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; } /* * Return minimum virtual address space size supported by the architecture */ static uintptr_t xlat_get_min_virt_addr_space_size(void) { uintptr_t ret; if (is_feat_ttst_present()) ret = MIN_VIRT_ADDR_SPACE_SIZE_TTST; else ret = MIN_VIRT_ADDR_SPACE_SIZE; return ret; } #endif /* ENABLE_ASSERTIONS */ unsigned int xlat_arch_current_el(void) { unsigned int el = (unsigned int)GET_EL(read_CurrentEl()); assert(el > 0U); return el; } uint64_t xlat_arch_get_xn_desc(unsigned int el) { if (el == 3U) { return UPPER_ATTRS(XN); } else { assert(el == 1U); return UPPER_ATTRS(PXN); } } void init_xlat_tables(void) { unsigned long long max_pa; uintptr_t max_va; assert(PLAT_VIRT_ADDR_SPACE_SIZE >= (xlat_get_min_virt_addr_space_size() - 1U)); assert(PLAT_VIRT_ADDR_SPACE_SIZE <= MAX_VIRT_ADDR_SPACE_SIZE); assert(IS_POWER_OF_TWO(PLAT_VIRT_ADDR_SPACE_SIZE)); print_mmap(); init_xlation_table(0U, base_xlation_table, XLAT_TABLE_LEVEL_BASE, &max_va, &max_pa); assert(max_va <= (PLAT_VIRT_ADDR_SPACE_SIZE - 1U)); assert(max_pa <= (PLAT_PHY_ADDR_SPACE_SIZE - 1U)); assert((PLAT_PHY_ADDR_SPACE_SIZE - 1U) <= get_max_supported_pa()); tcr_ps_bits = calc_physical_addr_size_bits(max_pa); } /******************************************************************************* * 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 * _tcr_extra: Extra bits to set in the TCR register. This mask will * be OR'ed with the default TCR value. * _tlbi_fct: Function to invalidate the TLBs at the current * exception level ******************************************************************************/ #define DEFINE_ENABLE_MMU_EL(_el, _tcr_extra, _tlbi_fct) \ void enable_mmu_el##_el(unsigned int flags) \ { \ uint64_t mair, tcr, ttbr; \ uint32_t sctlr; \ \ assert(IS_IN_EL(_el)); \ assert((read_sctlr_el##_el() & SCTLR_M_BIT) == 0U); \ \ /* 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); \ write_mair_el##_el(mair); \ \ /* Invalidate TLBs at the current exception level */ \ _tlbi_fct(); \ \ /* Set TCR bits as well. */ \ /* Set T0SZ to (64 - width of virtual address space) */ \ int t0sz = 64 - __builtin_ctzll(PLAT_VIRT_ADDR_SPACE_SIZE);\ \ if ((flags & XLAT_TABLE_NC) != 0U) { \ /* Inner & outer non-cacheable non-shareable. */\ tcr = TCR_SH_NON_SHAREABLE | \ TCR_RGN_OUTER_NC | TCR_RGN_INNER_NC | \ ((uint64_t)t0sz << TCR_T0SZ_SHIFT); \ } else { \ /* Inner & outer WBWA & shareable. */ \ tcr = TCR_SH_INNER_SHAREABLE | \ TCR_RGN_OUTER_WBA | TCR_RGN_INNER_WBA | \ ((uint64_t)t0sz << TCR_T0SZ_SHIFT); \ } \ tcr |= _tcr_extra; \ write_tcr_el##_el(tcr); \ \ /* Set TTBR bits as well */ \ ttbr = (uint64_t) base_xlation_table; \ 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 = read_sctlr_el##_el(); \ sctlr |= SCTLR_WXN_BIT | SCTLR_M_BIT; \ \ if ((flags & DISABLE_DCACHE) != 0U) \ sctlr &= ~SCTLR_C_BIT; \ else \ sctlr |= SCTLR_C_BIT; \ \ write_sctlr_el##_el(sctlr); \ \ /* Ensure the MMU enable takes effect immediately */ \ isb(); \ } \ \ void enable_mmu_direct_el##_el(unsigned int flags) \ { \ enable_mmu_el##_el(flags); \ } /* Define EL1 and EL3 variants of the function enabling the MMU */ DEFINE_ENABLE_MMU_EL(1, /* * TCR_EL1.EPD1: Disable translation table walk for addresses * that are translated using TTBR1_EL1. */ TCR_EPD1_BIT | (tcr_ps_bits << TCR_EL1_IPS_SHIFT), tlbivmalle1) DEFINE_ENABLE_MMU_EL(3, TCR_EL3_RES1 | (tcr_ps_bits << TCR_EL3_PS_SHIFT), tlbialle3)