| Server IP : 49.231.201.246 / Your IP : 216.73.216.149 Web Server : Apache/2.4.18 (Ubuntu) System : Linux 246 4.4.0-210-generic #242-Ubuntu SMP Fri Apr 16 09:57:56 UTC 2021 x86_64 User : root ( 0) PHP Version : 7.0.33-0ubuntu0.16.04.16 Disable Function : exec,passthru,shell_exec,system,proc_open,popen,pcntl_exec MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /proc/11585/task/11585/root/usr/src/linux-headers-4.4.0-210/arch/arm64/include/asm/ |
Upload File : |
/* * 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 */