66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
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/*
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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 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 3 pages are reserved in all cases.
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*/
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#ifdef CONFIG_ARM64_64K_PAGES
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#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS)
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#else
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#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1)
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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 (3 * PAGE_SIZE)
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/* Initial memory map size */
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#ifdef CONFIG_ARM64_64K_PAGES
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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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#else
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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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#endif
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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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#ifdef CONFIG_ARM64_64K_PAGES
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#define SWAPPER_MM_MMUFLAGS (PTE_ATTRINDX(MT_NORMAL) | SWAPPER_PTE_FLAGS)
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#else
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#define SWAPPER_MM_MMUFLAGS (PMD_ATTRINDX(MT_NORMAL) | SWAPPER_PMD_FLAGS)
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#endif
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#endif /* __ASM_KERNEL_PGTABLE_H */
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