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

INCLUDED FROM

   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 #ifndef __ASSEMBLY__
  11 
  12 #define clear_page(paddr)               memset((paddr), 0, PAGE_SIZE)
  13 #define copy_page(to, from)             memcpy((to), (from), PAGE_SIZE)
  14 
  15 struct vm_area_struct;
  16 struct page;
  17 
  18 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  19 
  20 void copy_user_highpage(struct page *to, struct page *from,
  21                         unsigned long u_vaddr, struct vm_area_struct *vma);
  22 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
  23 
  24 #undef STRICT_MM_TYPECHECKS
  25 
  26 #ifdef STRICT_MM_TYPECHECKS
  27 /*
  28  * These are used to make use of C type-checking..
  29  */
  30 typedef struct {
  31 #ifdef CONFIG_ARC_HAS_PAE40
  32         unsigned long long pte;
  33 #else
  34         unsigned long pte;
  35 #endif
  36 } pte_t;
  37 typedef struct {
  38         unsigned long pgd;
  39 } pgd_t;
  40 typedef struct {
  41         unsigned long pgprot;
  42 } pgprot_t;
  43 
  44 #define pte_val(x)      ((x).pte)
  45 #define pgd_val(x)      ((x).pgd)
  46 #define pgprot_val(x)   ((x).pgprot)
  47 
  48 #define __pte(x)        ((pte_t) { (x) })
  49 #define __pgd(x)        ((pgd_t) { (x) })
  50 #define __pgprot(x)     ((pgprot_t) { (x) })
  51 
  52 #define pte_pgprot(x) __pgprot(pte_val(x))
  53 
  54 #else /* !STRICT_MM_TYPECHECKS */
  55 
  56 #ifdef CONFIG_ARC_HAS_PAE40
  57 typedef unsigned long long pte_t;
  58 #else
  59 typedef unsigned long pte_t;
  60 #endif
  61 typedef unsigned long pgd_t;
  62 typedef unsigned long pgprot_t;
  63 
  64 #define pte_val(x)      (x)
  65 #define pgd_val(x)      (x)
  66 #define pgprot_val(x)   (x)
  67 #define __pte(x)        (x)
  68 #define __pgd(x)        (x)
  69 #define __pgprot(x)     (x)
  70 #define pte_pgprot(x)   (x)
  71 
  72 #endif
  73 
  74 typedef pte_t * pgtable_t;
  75 
  76 /*
  77  * Use virt_to_pfn with caution:
  78  * If used in pte or paddr related macros, it could cause truncation
  79  * in PAE40 builds
  80  * As a rule of thumb, only use it in helpers starting with virt_
  81  * You have been warned !
  82  */
  83 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  84 
  85 #define ARCH_PFN_OFFSET         virt_to_pfn(CONFIG_LINUX_RAM_BASE)
  86 
  87 #ifdef CONFIG_FLATMEM
  88 #define pfn_valid(pfn)          (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  89 #endif
  90 
  91 /*
  92  * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
  93  *
  94  * These macros have historically been misnamed
  95  * virt here means link-address/program-address as embedded in object code.
  96  * And for ARC, link-addr = physical address
  97  */
  98 #define __pa(vaddr)  ((unsigned long)(vaddr))
  99 #define __va(paddr)  ((void *)((unsigned long)(paddr)))
 100 
 101 #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
 102 #define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
 103 
 104 /* Default Permissions for stack/heaps pages (Non Executable) */
 105 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 106 
 107 #define WANT_PAGE_VIRTUAL   1
 108 
 109 #include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
 110 #include <asm-generic/getorder.h>
 111 
 112 #endif /* !__ASSEMBLY__ */
 113 
 114 #endif