root/arch/arm/include/asm/page.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  arch/arm/include/asm/page.h
   4  *
   5  *  Copyright (C) 1995-2003 Russell King
   6  */
   7 #ifndef _ASMARM_PAGE_H
   8 #define _ASMARM_PAGE_H
   9 
  10 /* PAGE_SHIFT determines the page size */
  11 #define PAGE_SHIFT              12
  12 #define PAGE_SIZE               (_AC(1,UL) << PAGE_SHIFT)
  13 #define PAGE_MASK               (~((1 << PAGE_SHIFT) - 1))
  14 
  15 #ifndef __ASSEMBLY__
  16 
  17 #ifndef CONFIG_MMU
  18 
  19 #include <asm/page-nommu.h>
  20 
  21 #else
  22 
  23 #include <asm/glue.h>
  24 
  25 /*
  26  *      User Space Model
  27  *      ================
  28  *
  29  *      This section selects the correct set of functions for dealing with
  30  *      page-based copying and clearing for user space for the particular
  31  *      processor(s) we're building for.
  32  *
  33  *      We have the following to choose from:
  34  *        v4wt          - ARMv4 with writethrough cache, without minicache
  35  *        v4wb          - ARMv4 with writeback cache, without minicache
  36  *        v4_mc         - ARMv4 with minicache
  37  *        xscale        - Xscale
  38  *        xsc3          - XScalev3
  39  */
  40 #undef _USER
  41 #undef MULTI_USER
  42 
  43 #ifdef CONFIG_CPU_COPY_V4WT
  44 # ifdef _USER
  45 #  define MULTI_USER 1
  46 # else
  47 #  define _USER v4wt
  48 # endif
  49 #endif
  50 
  51 #ifdef CONFIG_CPU_COPY_V4WB
  52 # ifdef _USER
  53 #  define MULTI_USER 1
  54 # else
  55 #  define _USER v4wb
  56 # endif
  57 #endif
  58 
  59 #ifdef CONFIG_CPU_COPY_FEROCEON
  60 # ifdef _USER
  61 #  define MULTI_USER 1
  62 # else
  63 #  define _USER feroceon
  64 # endif
  65 #endif
  66 
  67 #ifdef CONFIG_CPU_COPY_FA
  68 # ifdef _USER
  69 #  define MULTI_USER 1
  70 # else
  71 #  define _USER fa
  72 # endif
  73 #endif
  74 
  75 #ifdef CONFIG_CPU_SA1100
  76 # ifdef _USER
  77 #  define MULTI_USER 1
  78 # else
  79 #  define _USER v4_mc
  80 # endif
  81 #endif
  82 
  83 #ifdef CONFIG_CPU_XSCALE
  84 # ifdef _USER
  85 #  define MULTI_USER 1
  86 # else
  87 #  define _USER xscale_mc
  88 # endif
  89 #endif
  90 
  91 #ifdef CONFIG_CPU_XSC3
  92 # ifdef _USER
  93 #  define MULTI_USER 1
  94 # else
  95 #  define _USER xsc3_mc
  96 # endif
  97 #endif
  98 
  99 #ifdef CONFIG_CPU_COPY_V6
 100 # define MULTI_USER 1
 101 #endif
 102 
 103 #if !defined(_USER) && !defined(MULTI_USER)
 104 #error Unknown user operations model
 105 #endif
 106 
 107 struct page;
 108 struct vm_area_struct;
 109 
 110 struct cpu_user_fns {
 111         void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
 112         void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
 113                         unsigned long vaddr, struct vm_area_struct *vma);
 114 };
 115 
 116 #ifdef MULTI_USER
 117 extern struct cpu_user_fns cpu_user;
 118 
 119 #define __cpu_clear_user_highpage       cpu_user.cpu_clear_user_highpage
 120 #define __cpu_copy_user_highpage        cpu_user.cpu_copy_user_highpage
 121 
 122 #else
 123 
 124 #define __cpu_clear_user_highpage       __glue(_USER,_clear_user_highpage)
 125 #define __cpu_copy_user_highpage        __glue(_USER,_copy_user_highpage)
 126 
 127 extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
 128 extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
 129                         unsigned long vaddr, struct vm_area_struct *vma);
 130 #endif
 131 
 132 #define clear_user_highpage(page,vaddr)         \
 133          __cpu_clear_user_highpage(page, vaddr)
 134 
 135 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
 136 #define copy_user_highpage(to,from,vaddr,vma)   \
 137         __cpu_copy_user_highpage(to, from, vaddr, vma)
 138 
 139 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
 140 extern void copy_page(void *to, const void *from);
 141 
 142 #ifdef CONFIG_KUSER_HELPERS
 143 #define __HAVE_ARCH_GATE_AREA 1
 144 #endif
 145 
 146 #ifdef CONFIG_ARM_LPAE
 147 #include <asm/pgtable-3level-types.h>
 148 #else
 149 #include <asm/pgtable-2level-types.h>
 150 #endif
 151 
 152 #endif /* CONFIG_MMU */
 153 
 154 typedef struct page *pgtable_t;
 155 
 156 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 157 extern int pfn_valid(unsigned long);
 158 #endif
 159 
 160 #include <asm/memory.h>
 161 
 162 #endif /* !__ASSEMBLY__ */
 163 
 164 #define VM_DATA_DEFAULT_FLAGS \
 165         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
 166          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 167 
 168 #include <asm-generic/getorder.h>
 169 
 170 #endif