linux/arch/arc/include/asm/page.h
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   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   4 */
   5#ifndef __ASM_ARC_PAGE_H
   6#define __ASM_ARC_PAGE_H
   7
   8#include <uapi/asm/page.h>
   9
  10#ifdef CONFIG_ARC_HAS_PAE40
  11
  12#define MAX_POSSIBLE_PHYSMEM_BITS       40
  13#define PAGE_MASK_PHYS                  (0xff00000000ull | PAGE_MASK)
  14
  15#else /* CONFIG_ARC_HAS_PAE40 */
  16
  17#define MAX_POSSIBLE_PHYSMEM_BITS       32
  18#define PAGE_MASK_PHYS                  PAGE_MASK
  19
  20#endif /* CONFIG_ARC_HAS_PAE40 */
  21
  22#ifndef __ASSEMBLY__
  23
  24#define clear_page(paddr)               memset((paddr), 0, PAGE_SIZE)
  25#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  26#define copy_page(to, from)             memcpy((to), (from), PAGE_SIZE)
  27
  28struct vm_area_struct;
  29struct page;
  30
  31#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  32
  33void copy_user_highpage(struct page *to, struct page *from,
  34                        unsigned long u_vaddr, struct vm_area_struct *vma);
  35void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
  36
  37#undef STRICT_MM_TYPECHECKS
  38
  39#ifdef STRICT_MM_TYPECHECKS
  40/*
  41 * These are used to make use of C type-checking..
  42 */
  43typedef struct {
  44#ifdef CONFIG_ARC_HAS_PAE40
  45        unsigned long long pte;
  46#else
  47        unsigned long pte;
  48#endif
  49} pte_t;
  50typedef struct {
  51        unsigned long pgd;
  52} pgd_t;
  53typedef struct {
  54        unsigned long pgprot;
  55} pgprot_t;
  56
  57#define pte_val(x)      ((x).pte)
  58#define pgd_val(x)      ((x).pgd)
  59#define pgprot_val(x)   ((x).pgprot)
  60
  61#define __pte(x)        ((pte_t) { (x) })
  62#define __pgd(x)        ((pgd_t) { (x) })
  63#define __pgprot(x)     ((pgprot_t) { (x) })
  64
  65#define pte_pgprot(x) __pgprot(pte_val(x))
  66
  67#else /* !STRICT_MM_TYPECHECKS */
  68
  69#ifdef CONFIG_ARC_HAS_PAE40
  70typedef unsigned long long pte_t;
  71#else
  72typedef unsigned long pte_t;
  73#endif
  74typedef unsigned long pgd_t;
  75typedef unsigned long pgprot_t;
  76
  77#define pte_val(x)      (x)
  78#define pgd_val(x)      (x)
  79#define pgprot_val(x)   (x)
  80#define __pte(x)        (x)
  81#define __pgd(x)        (x)
  82#define __pgprot(x)     (x)
  83#define pte_pgprot(x)   (x)
  84
  85#endif
  86
  87typedef pte_t * pgtable_t;
  88
  89/*
  90 * Use virt_to_pfn with caution:
  91 * If used in pte or paddr related macros, it could cause truncation
  92 * in PAE40 builds
  93 * As a rule of thumb, only use it in helpers starting with virt_
  94 * You have been warned !
  95 */
  96#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  97
  98/*
  99 * When HIGHMEM is enabled we have holes in the memory map so we need
 100 * pfn_valid() that takes into account the actual extents of the physical
 101 * memory
 102 */
 103#ifdef CONFIG_HIGHMEM
 104
 105extern unsigned long arch_pfn_offset;
 106#define ARCH_PFN_OFFSET         arch_pfn_offset
 107
 108extern int pfn_valid(unsigned long pfn);
 109#define pfn_valid               pfn_valid
 110
 111#else /* CONFIG_HIGHMEM */
 112
 113#define ARCH_PFN_OFFSET         virt_to_pfn(CONFIG_LINUX_RAM_BASE)
 114#define pfn_valid(pfn)          (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
 115
 116#endif /* CONFIG_HIGHMEM */
 117
 118/*
 119 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
 120 *
 121 * These macros have historically been misnamed
 122 * virt here means link-address/program-address as embedded in object code.
 123 * And for ARC, link-addr = physical address
 124 */
 125#define __pa(vaddr)  ((unsigned long)(vaddr))
 126#define __va(paddr)  ((void *)((unsigned long)(paddr)))
 127
 128#define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
 129#define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
 130
 131/* Default Permissions for stack/heaps pages (Non Executable) */
 132#define VM_DATA_DEFAULT_FLAGS   VM_DATA_FLAGS_NON_EXEC
 133
 134#define WANT_PAGE_VIRTUAL   1
 135
 136#include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
 137#include <asm-generic/getorder.h>
 138
 139#endif /* !__ASSEMBLY__ */
 140
 141#endif
 142