mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
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
/*
|
|
* Kernel page table mapping
|
|
*
|
|
* Copyright (C) 2015 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef __ASM_KERNEL_PGTABLE_H
|
|
#define __ASM_KERNEL_PGTABLE_H
|
|
|
|
|
|
/*
|
|
* The linear mapping and the start of memory are both 2M aligned (per
|
|
* the arm64 booting.txt requirements). Hence we can use section mapping
|
|
* with 4K (section size = 2M) but not with 16K (section size = 32M) or
|
|
* 64K (section size = 512M).
|
|
*/
|
|
#ifdef CONFIG_ARM64_4K_PAGES
|
|
#define ARM64_SWAPPER_USES_SECTION_MAPS 1
|
|
#else
|
|
#define ARM64_SWAPPER_USES_SECTION_MAPS 0
|
|
#endif
|
|
|
|
/*
|
|
* The idmap and swapper page tables need some space reserved in the kernel
|
|
* image. Both require pgd, pud (4 levels only) and pmd tables to (section)
|
|
* map the kernel. With the 64K page configuration, swapper and idmap need to
|
|
* map to pte level. The swapper also maps the FDT (see __create_page_tables
|
|
* for more information). Note that the number of ID map translation levels
|
|
* could be increased on the fly if system RAM is out of reach for the default
|
|
* VA range, so pages required to map highest possible PA are reserved in all
|
|
* cases.
|
|
*/
|
|
#if ARM64_SWAPPER_USES_SECTION_MAPS
|
|
#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1)
|
|
#define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT) - 1)
|
|
#else
|
|
#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS)
|
|
#define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT))
|
|
#endif
|
|
|
|
#define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE)
|
|
#define IDMAP_DIR_SIZE (IDMAP_PGTABLE_LEVELS * PAGE_SIZE)
|
|
|
|
/* Initial memory map size */
|
|
#if ARM64_SWAPPER_USES_SECTION_MAPS
|
|
#define SWAPPER_BLOCK_SHIFT SECTION_SHIFT
|
|
#define SWAPPER_BLOCK_SIZE SECTION_SIZE
|
|
#define SWAPPER_TABLE_SHIFT PUD_SHIFT
|
|
#else
|
|
#define SWAPPER_BLOCK_SHIFT PAGE_SHIFT
|
|
#define SWAPPER_BLOCK_SIZE PAGE_SIZE
|
|
#define SWAPPER_TABLE_SHIFT PMD_SHIFT
|
|
#endif
|
|
|
|
/* The size of the initial kernel direct mapping */
|
|
#define SWAPPER_INIT_MAP_SIZE (_AC(1, UL) << SWAPPER_TABLE_SHIFT)
|
|
|
|
/*
|
|
* Initial memory map attributes.
|
|
*/
|
|
#define SWAPPER_PTE_FLAGS (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
|
|
#define SWAPPER_PMD_FLAGS (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
|
|
|
|
#if ARM64_SWAPPER_USES_SECTION_MAPS
|
|
#define SWAPPER_MM_MMUFLAGS (PMD_ATTRINDX(MT_NORMAL) | SWAPPER_PMD_FLAGS)
|
|
#else
|
|
#define SWAPPER_MM_MMUFLAGS (PTE_ATTRINDX(MT_NORMAL) | SWAPPER_PTE_FLAGS)
|
|
#endif
|
|
|
|
|
|
#endif /* __ASM_KERNEL_PGTABLE_H */
|