diff --git a/include/lib/xlat_tables.h b/include/lib/xlat_tables.h index b51a1de..3f35e45 100644 --- a/include/lib/xlat_tables.h +++ b/include/lib/xlat_tables.h @@ -188,9 +188,14 @@ size_t size, unsigned int attr); void mmap_add(const mmap_region_t *mm); +#ifdef AARCH32 +/* AArch32 specific translation table API */ +void enable_mmu_secure(uint32_t flags); +#else /* AArch64 specific translation table APIs */ void enable_mmu_el1(unsigned int flags); void enable_mmu_el3(unsigned int flags); +#endif /* AARCH32 */ #endif /*__ASSEMBLY__*/ #endif /* __XLAT_TABLES_H__ */ diff --git a/lib/xlat_tables/aarch32/xlat_tables.c b/lib/xlat_tables/aarch32/xlat_tables.c new file mode 100644 index 0000000..a97cf31 --- /dev/null +++ b/lib/xlat_tables/aarch32/xlat_tables.c @@ -0,0 +1,123 @@ +/* + * Copyright (c) 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 "../xlat_tables_private.h" + +/* + * The virtual address space size must be a power of two. As we start the initial + * lookup at level 1, it must also be between 2 GB and 4 GB. See section + * G4.6.5 in the ARMv8-A Architecture Reference Manual (DDI 0487A.j) for more + * information. + */ +CASSERT(ADDR_SPACE_SIZE >= (1ull << 31) && ADDR_SPACE_SIZE <= (1ull << 32) && + IS_POWER_OF_TWO(ADDR_SPACE_SIZE), assert_valid_addr_space_size); + +#define NUM_L1_ENTRIES (ADDR_SPACE_SIZE >> L1_XLAT_ADDRESS_SHIFT) + +static uint64_t l1_xlation_table[NUM_L1_ENTRIES] + __aligned(NUM_L1_ENTRIES * sizeof(uint64_t)); + +void init_xlat_tables(void) +{ + unsigned long long max_pa; + uintptr_t max_va; + print_mmap(); + init_xlation_table(0, l1_xlation_table, 1, &max_va, &max_pa); + assert(max_va < ADDR_SPACE_SIZE); +} + +/******************************************************************************* + * Function for enabling the MMU in Secure PL1, assuming that the + * page-tables have already been created. + ******************************************************************************/ +void enable_mmu_secure(unsigned int flags) +{ + unsigned int mair0, ttbcr, sctlr; + uint64_t ttbr0; + + assert(IS_IN_SECURE()); + assert((read_sctlr() & SCTLR_M_BIT) == 0); + + /* Set attributes in the right indices of the MAIR */ + mair0 = MAIR0_ATTR_SET(ATTR_DEVICE, ATTR_DEVICE_INDEX); + mair0 |= MAIR0_ATTR_SET(ATTR_IWBWA_OWBWA_NTR, + ATTR_IWBWA_OWBWA_NTR_INDEX); + mair0 |= MAIR0_ATTR_SET(ATTR_NON_CACHEABLE, + ATTR_NON_CACHEABLE_INDEX); + write_mair0(mair0); + + /* Invalidate TLBs at the current exception level */ + tlbiall(); + + /* + * Set TTBCR bits as well. Set TTBR0 table properties as Inner + * & outer WBWA & shareable. Disable TTBR1. + */ + ttbcr = TTBCR_EAE_BIT | + TTBCR_SH0_INNER_SHAREABLE | TTBCR_RGN0_OUTER_WBA | + TTBCR_RGN0_INNER_WBA | + (32 - __builtin_ctzl((uintptr_t)ADDR_SPACE_SIZE)); + ttbcr |= TTBCR_EPD1_BIT; + write_ttbcr(ttbcr); + + /* Set TTBR0 bits as well */ + ttbr0 = (uintptr_t) l1_xlation_table; + write64_ttbr0(ttbr0); + write64_ttbr1(0); + + /* + * Ensure all translation table writes have drained + * into memory, the TLB invalidation is complete, + * and translation register writes are committed + * before enabling the MMU + */ + dsb(); + isb(); + + sctlr = read_sctlr(); + sctlr |= SCTLR_WXN_BIT | SCTLR_M_BIT; + + if (flags & DISABLE_DCACHE) + sctlr &= ~SCTLR_C_BIT; + else + sctlr |= SCTLR_C_BIT; + + write_sctlr(sctlr); + + /* Ensure the MMU enable takes effect immediately */ + isb(); +}