xref: /arm-trusted-firmware/include/lib/xlat_tables/xlat_mmu_helpers.h (revision 91f16700b400a8c0651d24a598fc48ee2997a0d7)

/*
 * Copyright (c) 2014-2018, Arm Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#ifndef XLAT_MMU_HELPERS_H
#define XLAT_MMU_HELPERS_H

/*
 * The following flags are passed to enable_mmu_xxx() to override the default
 * values used to program system registers while enabling the MMU.
 */

/*
 * When this flag is used, all data access to Normal memory from this EL and all
 * Normal memory accesses to the translation tables of this EL are non-cacheable
 * for all levels of data and unified cache until the caches are enabled by
 * setting the bit SCTLR_ELx.C.
 */
#define DISABLE_DCACHE			(U(1) << 0)

/*
 * Mark the translation tables as non-cacheable for the MMU table walker, which
 * is a different observer from the PE/CPU. If the flag is not specified, the
 * tables are cacheable for the MMU table walker.
 *
 * Note that, as far as the PE/CPU observer is concerned, the attributes used
 * are the ones specified in the translation tables themselves. The MAIR
 * register specifies the cacheability through the field AttrIndx of the lower
 * attributes of the translation tables. The shareability is specified in the SH
 * field of the lower attributes.
 *
 * The MMU table walker uses the attributes specified in the fields ORGNn, IRGNn
 * and SHn of the TCR register to access the translation tables.
 *
 * The attributes specified in the TCR register and the tables can be different
 * as there are no checks to prevent that. Special care must be taken to ensure
 * that there aren't mismatches. The behaviour in that case is described in the
 * sections 'Mismatched memory attributes' in the ARMv8 ARM.
 */
#define XLAT_TABLE_NC			(U(1) << 1)

/*
 * Offsets into a mmu_cfg_params array generated by setup_mmu_cfg(). All
 * parameters are 64 bits wide.
 */
#define MMU_CFG_MAIR		0
#define MMU_CFG_TCR		1
#define MMU_CFG_TTBR0		2
#define MMU_CFG_PARAM_MAX	3

#ifndef __ASSEMBLER__

#include <stdbool.h>
#include <stdint.h>
#include <string.h>

#include <arch_helpers.h>

/*
 * Return the values that the MMU configuration registers must contain for the
 * specified translation context. `params` must be a pointer to array of size
 * MMU_CFG_PARAM_MAX.
 */
void setup_mmu_cfg(uint64_t *params, unsigned int flags,
		   const uint64_t *base_table, unsigned long long max_pa,
		   uintptr_t max_va, int xlat_regime);

#ifdef __aarch64__
/* AArch64 specific translation table APIs */
void enable_mmu_el1(unsigned int flags);
void enable_mmu_el2(unsigned int flags);
void enable_mmu_el3(unsigned int flags);
void enable_mmu(unsigned int flags);

void enable_mmu_direct_el1(unsigned int flags);
void enable_mmu_direct_el2(unsigned int flags);
void enable_mmu_direct_el3(unsigned int flags);
#else
/* AArch32 specific translation table API */
void enable_mmu_svc_mon(unsigned int flags);
void enable_mmu_hyp(unsigned int flags);

void enable_mmu_direct_svc_mon(unsigned int flags);
void enable_mmu_direct_hyp(unsigned int flags);
#endif /* __aarch64__ */

bool xlat_arch_is_granule_size_supported(size_t size);
size_t xlat_arch_get_max_supported_granule_size(void);

#endif /* __ASSEMBLER__ */

#endif /* XLAT_MMU_HELPERS_H */