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https://github.com/ARM-software/arm-trusted-firmware.git
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638b034cc3
Previously mem_protect used to be only supported from BL2. This is not helpful in the case when ARM TF-A BL2 is not used. This patch demonstrates mem_protect from el3_runtime firmware on ARM Platforms specifically when RESET_TO_BL31 or RESET_TO_SP_MIN flag is set as BL2 may be absent in these cases. The Non secure DRAM is dynamically mapped into EL3 mmap tables temporarily and then the protected regions are then cleared. This avoids the need to map the non secure DRAM permanently to BL31/sp_min. The stack size is also increased, because DYNAMIC_XLAT_TABLES require a bigger stack. Change-Id: Ia44c594192ed5c5adc596c0cff2c7cc18c001fde Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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* Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __UTILS_H__
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#define __UTILS_H__
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#if !ERROR_DEPRECATED
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#include <utils_def.h>
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#endif
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/*
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* C code should be put in this part of the header to avoid breaking ASM files
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* or linker scripts including it.
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*/
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#if !(defined(__LINKER__) || defined(__ASSEMBLY__))
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#include <types.h>
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typedef struct mem_region {
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uintptr_t base;
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size_t nbytes;
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} mem_region_t;
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/*
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* zero_normalmem all the regions defined in tbl.
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*/
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void clear_mem_regions(mem_region_t *tbl, size_t nregions);
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/*
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* zero_normalmem all the regions defined in region. It dynamically
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* maps chunks of 'chunk_size' in 'va' virtual address and clears them.
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* For this reason memory regions must be multiple of chunk_size and
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* must be aligned to it as well. chunk_size and va can be selected
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* in a way that they minimize the number of entries used in the
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* translation tables.
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*/
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void clear_map_dyn_mem_regions(mem_region_t *region,
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size_t nregions,
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uintptr_t va,
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size_t chunk_size);
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/*
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* checks that a region (addr + nbytes-1) of memory is totally covered by
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* one of the regions defined in tbl. Caller must ensure that (addr+nbytes-1)
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* doesn't overflow.
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*/
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int mem_region_in_array_chk(mem_region_t *tbl, size_t nregions,
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uintptr_t addr, size_t nbytes);
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/*
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* Fill a region of normal memory of size "length" in bytes with zero bytes.
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*
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* WARNING: This function can only operate on normal memory. This means that
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* the MMU must be enabled when using this function. Otherwise, use
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* zeromem.
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*/
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void zero_normalmem(void *mem, u_register_t length);
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/*
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* Fill a region of memory of size "length" in bytes with null bytes.
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*
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* Unlike zero_normalmem, this function has no restriction on the type of
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* memory targeted and can be used for any device memory as well as normal
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* memory. This function must be used instead of zero_normalmem when MMU is
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* disabled.
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*
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* NOTE: When data cache and MMU are enabled, prefer zero_normalmem for faster
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* zeroing.
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*/
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void zeromem(void *mem, u_register_t length);
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#endif /* !(defined(__LINKER__) || defined(__ASSEMBLY__)) */
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#endif /* __UTILS_H__ */
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