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e41ceed035
This patch adds virtual address space size and a level of translation tables to kernel configuration. It facilicates introduction of different MMU options, such as 4KB + 4 levels, 16KB + 4 levels and 64KB + 3 levels, easily. The idea is based on the discussion with Catalin Marinas: http://www.spinics.net/linux/lists/arm-kernel/msg319552.html Signed-off-by: Jungseok Lee <jays.lee@samsung.com> Reviewed-by: Sungjinn Chung <sungjinn.chung@samsung.com> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Jungseok Lee <jungseoklee85@gmail.com>
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*
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* Based on arch/arm/include/asm/page.h
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*
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* Copyright (C) 1995-2003 Russell King
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* Copyright (C) 2012 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_PAGE_H
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#define __ASM_PAGE_H
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/* PAGE_SHIFT determines the page size */
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#ifdef CONFIG_ARM64_64K_PAGES
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#define PAGE_SHIFT 16
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#else
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#define PAGE_SHIFT 12
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#endif
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#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
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#define __HAVE_ARCH_GATE_AREA 1
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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 a pgd and a next level table to (section) map the
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* kernel. The the swapper also maps the FDT (see __create_page_tables for
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* more information).
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*/
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#define SWAPPER_DIR_SIZE (2 * PAGE_SIZE)
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#define IDMAP_DIR_SIZE (2 * PAGE_SIZE)
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_ARM64_2_LEVELS
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#include <asm/pgtable-2level-types.h>
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#else
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#include <asm/pgtable-3level-types.h>
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#endif
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extern void __cpu_clear_user_page(void *p, unsigned long user);
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extern void __cpu_copy_user_page(void *to, const void *from,
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unsigned long user);
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extern void copy_page(void *to, const void *from);
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extern void clear_page(void *to);
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#define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr)
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#define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
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typedef struct page *pgtable_t;
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#ifdef CONFIG_HAVE_ARCH_PFN_VALID
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extern int pfn_valid(unsigned long);
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#endif
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#include <asm/memory.h>
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#endif /* !__ASSEMBLY__ */
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#define VM_DATA_DEFAULT_FLAGS \
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(((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
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VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/getorder.h>
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#endif
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