/* * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of ARM nor the names of its contributors may be used * to endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include "../xlat_tables_private.h" /* * Each platform can define the size of the virtual address space, which is * defined in PLAT_VIRT_ADDR_SPACE_SIZE. TCR.TxSZ is calculated as 64 minus the * width of said address space. The value of TCR.TxSZ must be in the range 16 * to 39 [1], which means that the virtual address space width must be in the * range 48 to 25 bits. * * Here we calculate the initial lookup level from the value of * PLAT_VIRT_ADDR_SPACE_SIZE. For a 4 KB page size, level 0 supports virtual * address spaces of widths 48 to 40 bits, level 1 from 39 to 31, and level 2 * from 30 to 25. Wider or narrower address spaces are not supported. As a * result, level 3 cannot be used as initial lookup level with 4 KB * granularity. [2] * * For example, for a 35-bit address space (i.e. PLAT_VIRT_ADDR_SPACE_SIZE == * 1 << 35), TCR.TxSZ will be programmed to (64 - 35) = 29. According to Table * D4-11 in the ARM ARM, the initial lookup level for an address space like * that is 1. * * See the ARMv8-A Architecture Reference Manual (DDI 0487A.j) for more * information: * [1] Page 1730: 'Input address size', 'For all translation stages'. * [2] Section D4.2.5 */ #if PLAT_VIRT_ADDR_SPACE_SIZE > (1ULL << (64 - TCR_TxSZ_MIN)) # error "PLAT_VIRT_ADDR_SPACE_SIZE is too big." #elif PLAT_VIRT_ADDR_SPACE_SIZE > (1ULL << L0_XLAT_ADDRESS_SHIFT) # define XLAT_TABLE_LEVEL_BASE 0 # define NUM_BASE_LEVEL_ENTRIES \ (PLAT_VIRT_ADDR_SPACE_SIZE >> L0_XLAT_ADDRESS_SHIFT) #elif PLAT_VIRT_ADDR_SPACE_SIZE > (1 << L1_XLAT_ADDRESS_SHIFT) # define XLAT_TABLE_LEVEL_BASE 1 # define NUM_BASE_LEVEL_ENTRIES \ (PLAT_VIRT_ADDR_SPACE_SIZE >> L1_XLAT_ADDRESS_SHIFT) #elif PLAT_VIRT_ADDR_SPACE_SIZE >= (1 << (64 - TCR_TxSZ_MAX)) # define XLAT_TABLE_LEVEL_BASE 2 # define NUM_BASE_LEVEL_ENTRIES \ (PLAT_VIRT_ADDR_SPACE_SIZE >> L2_XLAT_ADDRESS_SHIFT) #else # error "PLAT_VIRT_ADDR_SPACE_SIZE is too small." #endif 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) == 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 DEBUG /* Physical Address ranges supported in the AArch64 Memory Model */ static const unsigned int pa_range_bits_arr[] = { PARANGE_0000, PARANGE_0001, PARANGE_0010, PARANGE_0011, PARANGE_0100, PARANGE_0101 }; 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; } #endif void init_xlat_tables(void) { unsigned long long max_pa; uintptr_t max_va; print_mmap(); init_xlation_table(0, base_xlation_table, XLAT_TABLE_LEVEL_BASE, &max_va, &max_pa); assert(max_va <= PLAT_VIRT_ADDR_SPACE_SIZE - 1); assert(max_pa <= PLAT_PHY_ADDR_SPACE_SIZE - 1); assert((PLAT_PHY_ADDR_SPACE_SIZE - 1) <= 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) == 0); \ \ /* 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. */ \ /* Inner & outer WBWA & shareable. */ \ /* Set T0SZ to (64 - width of virtual address space) */ \ tcr = TCR_SH_INNER_SHAREABLE | TCR_RGN_OUTER_WBA | \ TCR_RGN_INNER_WBA | \ (64 - __builtin_ctzl(PLAT_VIRT_ADDR_SPACE_SIZE));\ 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) \ 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 */ DEFINE_ENABLE_MMU_EL(1, (tcr_ps_bits << TCR_EL1_IPS_SHIFT), tlbivmalle1) DEFINE_ENABLE_MMU_EL(3, TCR_EL3_RES1 | (tcr_ps_bits << TCR_EL3_PS_SHIFT), tlbialle3)