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c265af51c5
Now that we can calculate the number of levels required for mapping a va width, reserve exact number of pages that would be required to cover the idmap. The idmap should be able to handle the maximum physical address size supported. Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
/*
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* Kernel page table mapping
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*
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* Copyright (C) 2015 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_KERNEL_PGTABLE_H
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#define __ASM_KERNEL_PGTABLE_H
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/*
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* The linear mapping and the start of memory are both 2M aligned (per
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* the arm64 booting.txt requirements). Hence we can use section mapping
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* with 4K (section size = 2M) but not with 16K (section size = 32M) or
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* 64K (section size = 512M).
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*/
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#ifdef CONFIG_ARM64_4K_PAGES
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#define ARM64_SWAPPER_USES_SECTION_MAPS 1
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#else
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#define ARM64_SWAPPER_USES_SECTION_MAPS 0
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#endif
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/*
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* The idmap and swapper page tables need some space reserved in the kernel
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* image. Both require pgd, pud (4 levels only) and pmd tables to (section)
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* map the kernel. With the 64K page configuration, swapper and idmap need to
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* map to pte level. The swapper also maps the FDT (see __create_page_tables
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* for more information). Note that the number of ID map translation levels
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* could be increased on the fly if system RAM is out of reach for the default
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* VA range, so pages required to map highest possible PA are reserved in all
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* cases.
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*/
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#if ARM64_SWAPPER_USES_SECTION_MAPS
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#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1)
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#define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT) - 1)
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#else
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#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS)
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#define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT))
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#endif
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#define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE)
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#define IDMAP_DIR_SIZE (IDMAP_PGTABLE_LEVELS * PAGE_SIZE)
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/* Initial memory map size */
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#if ARM64_SWAPPER_USES_SECTION_MAPS
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#define SWAPPER_BLOCK_SHIFT SECTION_SHIFT
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#define SWAPPER_BLOCK_SIZE SECTION_SIZE
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#define SWAPPER_TABLE_SHIFT PUD_SHIFT
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#else
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#define SWAPPER_BLOCK_SHIFT PAGE_SHIFT
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#define SWAPPER_BLOCK_SIZE PAGE_SIZE
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#define SWAPPER_TABLE_SHIFT PMD_SHIFT
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#endif
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/* The size of the initial kernel direct mapping */
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#define SWAPPER_INIT_MAP_SIZE (_AC(1, UL) << SWAPPER_TABLE_SHIFT)
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/*
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* Initial memory map attributes.
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*/
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#define SWAPPER_PTE_FLAGS (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
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#define SWAPPER_PMD_FLAGS (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
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#if ARM64_SWAPPER_USES_SECTION_MAPS
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#define SWAPPER_MM_MMUFLAGS (PMD_ATTRINDX(MT_NORMAL) | SWAPPER_PMD_FLAGS)
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#else
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#define SWAPPER_MM_MMUFLAGS (PTE_ATTRINDX(MT_NORMAL) | SWAPPER_PTE_FLAGS)
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#endif
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#endif /* __ASM_KERNEL_PGTABLE_H */
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