blob: 77953177003ab5a4a61aa29d6ce1014ed2832b99 [file] [log] [blame]
/*
* 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)
#ifndef __ASSEMBLY__
#include <sys/types.h>
#ifdef AARCH32
/* AArch32 specific translation table API */
void enable_mmu_secure(unsigned int flags);
#else
/* AArch64 specific translation table APIs */
void enable_mmu_el1(unsigned int flags);
void enable_mmu_el3(unsigned int flags);
#endif /* AARCH32 */
int xlat_arch_is_granule_size_supported(size_t size);
size_t xlat_arch_get_max_supported_granule_size(void);
#endif /* __ASSEMBLY__ */
#endif /* __XLAT_MMU_HELPERS_H__ */