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+/*
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+ * arch/arm/include/asm/pgtable.h
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+ *
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+ * Copyright (C) 1995-2002 Russell King
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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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+#ifndef _ASMARM_PGTABLE_H
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+#define _ASMARM_PGTABLE_H
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+
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+#include <linux/const.h>
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+#include <asm/proc-fns.h>
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+
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+#ifndef CONFIG_MMU
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+
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+#include <asm-generic/4level-fixup.h>
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+#include <asm/pgtable-nommu.h>
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+
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+#else
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+
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+#include <asm-generic/pgtable-nopud.h>
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+#include <asm/memory.h>
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+#include <asm/pgtable-hwdef.h>
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+
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+#ifdef CONFIG_ARM_LPAE
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+#include <asm/pgtable-3level.h>
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+#else
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+#include <asm/pgtable-2level.h>
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+#endif
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+
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+/*
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+ * Just any arbitrary offset to the start of the vmalloc VM area: the
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+ * current 8MB value just means that there will be a 8MB "hole" after the
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+ * physical memory until the kernel virtual memory starts. That means that
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+ * any out-of-bounds memory accesses will hopefully be caught.
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+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
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+ * area for the same reason. ;)
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+ */
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+#define VMALLOC_OFFSET (8*1024*1024)
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+#define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
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+#define VMALLOC_END 0xff000000UL
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+
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+#define LIBRARY_TEXT_START 0x0c000000
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+
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+#ifndef __ASSEMBLY__
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+extern void __pte_error(const char *file, int line, pte_t);
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+extern void __pmd_error(const char *file, int line, pmd_t);
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+extern void __pgd_error(const char *file, int line, pgd_t);
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+
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+#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte)
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+#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd)
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+#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd)
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+
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+/*
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+ * This is the lowest virtual address we can permit any user space
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+ * mapping to be mapped at. This is particularly important for
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+ * non-high vector CPUs.
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+ */
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+#define FIRST_USER_ADDRESS PAGE_SIZE
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+
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+/*
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+ * The pgprot_* and protection_map entries will be fixed up in runtime
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+ * to include the cachable and bufferable bits based on memory policy,
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+ * as well as any architecture dependent bits like global/ASID and SMP
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+ * shared mapping bits.
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+ */
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+#define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG
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+
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+extern pgprot_t pgprot_user;
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+extern pgprot_t pgprot_kernel;
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+
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+#define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b))
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+
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+#define PAGE_NONE _MOD_PROT(pgprot_user, L_PTE_XN | L_PTE_RDONLY | L_PTE_NONE)
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+#define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN)
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+#define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER)
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+#define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
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+#define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
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+#define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
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+#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
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+#define PAGE_KERNEL _MOD_PROT(pgprot_kernel, L_PTE_XN)
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+#define PAGE_KERNEL_EXEC pgprot_kernel
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+
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+#define __PAGE_NONE __pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN | L_PTE_NONE)
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+#define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN)
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+#define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
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+#define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
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+#define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY)
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+#define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
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+#define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY)
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+
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+#define __pgprot_modify(prot,mask,bits) \
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+ __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
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+
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+#define pgprot_noncached(prot) \
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+ __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
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+
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+#define pgprot_writecombine(prot) \
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+ __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE)
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+
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+#define pgprot_stronglyordered(prot) \
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+ __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
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+
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+#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
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+#define pgprot_dmacoherent(prot) \
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+ __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN)
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+#define __HAVE_PHYS_MEM_ACCESS_PROT
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+struct file;
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+extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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+ unsigned long size, pgprot_t vma_prot);
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+#else
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+#define pgprot_dmacoherent(prot) \
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+ __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED | L_PTE_XN)
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+#endif
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+
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+#endif /* __ASSEMBLY__ */
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+
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+/*
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+ * The table below defines the page protection levels that we insert into our
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+ * Linux page table version. These get translated into the best that the
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+ * architecture can perform. Note that on most ARM hardware:
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+ * 1) We cannot do execute protection
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+ * 2) If we could do execute protection, then read is implied
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+ * 3) write implies read permissions
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+ */
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+#define __P000 __PAGE_NONE
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+#define __P001 __PAGE_READONLY
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+#define __P010 __PAGE_COPY
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+#define __P011 __PAGE_COPY
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+#define __P100 __PAGE_READONLY_EXEC
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+#define __P101 __PAGE_READONLY_EXEC
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+#define __P110 __PAGE_COPY_EXEC
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+#define __P111 __PAGE_COPY_EXEC
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+
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+#define __S000 __PAGE_NONE
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+#define __S001 __PAGE_READONLY
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+#define __S010 __PAGE_SHARED
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+#define __S011 __PAGE_SHARED
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+#define __S100 __PAGE_READONLY_EXEC
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+#define __S101 __PAGE_READONLY_EXEC
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+#define __S110 __PAGE_SHARED_EXEC
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+#define __S111 __PAGE_SHARED_EXEC
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+
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+#ifndef __ASSEMBLY__
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+/*
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+ * ZERO_PAGE is a global shared page that is always zero: used
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+ * for zero-mapped memory areas etc..
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+ */
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+extern struct page *empty_zero_page;
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+#define ZERO_PAGE(vaddr) (empty_zero_page)
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+
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+
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+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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+
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+/* to find an entry in a page-table-directory */
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