arch/arc/include/asm/page.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #ifndef __ASM_ARC_PAGE_H
   9 #define __ASM_ARC_PAGE_H
  10
  11 #include <uapi/asm/page.h>
  12
  13 #ifndef __ASSEMBLY__
  14
  15 #define clear_page(paddr)               memset((paddr), 0, PAGE_SIZE)
  16 #define copy_page(to, from)             memcpy((to), (from), PAGE_SIZE)
  17
  18 struct vm_area_struct;
  19 struct page;
  20
  21 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  22
  23 void copy_user_highpage(struct page *to, struct page *from,
  24                         unsigned long u_vaddr, struct vm_area_struct *vma);
  25 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
  26
  27 #undef STRICT_MM_TYPECHECKS
  28
  29 #ifdef STRICT_MM_TYPECHECKS
  30 /*
  31  * These are used to make use of C type-checking..
  32  */
  33 typedef struct {
  34         unsigned long pte;
  35 } pte_t;
  36 typedef struct {
  37         unsigned long pgd;
  38 } pgd_t;
  39 typedef struct {
  40         unsigned long pgprot;
  41 } pgprot_t;
  42
  43 #define pte_val(x)      ((x).pte)
  44 #define pgd_val(x)      ((x).pgd)
  45 #define pgprot_val(x)   ((x).pgprot)
  46
  47 #define __pte(x)        ((pte_t) { (x) })
  48 #define __pgd(x)        ((pgd_t) { (x) })
  49 #define __pgprot(x)     ((pgprot_t) { (x) })
  50
  51 #define pte_pgprot(x) __pgprot(pte_val(x))
  52
  53 #else /* !STRICT_MM_TYPECHECKS */
  54
  55 #ifdef CONFIG_ARC_HAS_PAE40
  56 typedef unsigned long long pte_t;
  57 #else
  58 typedef unsigned long pte_t;
  59 #endif
  60 typedef unsigned long pgd_t;
  61 typedef unsigned long pgprot_t;
  62
  63 #define pte_val(x)      (x)
  64 #define pgd_val(x)      (x)
  65 #define pgprot_val(x)   (x)
  66 #define __pte(x)        (x)
  67 #define __pgd(x)        (x)
  68 #define __pgprot(x)     (x)
  69 #define pte_pgprot(x)   (x)
  70
  71 #endif
  72
  73 typedef pte_t * pgtable_t;
  74
  75 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  76
  77 #define ARCH_PFN_OFFSET         virt_to_pfn(CONFIG_LINUX_LINK_BASE)
  78
  79 #define pfn_valid(pfn)          (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  80
  81 /*
  82  * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
  83  *
  84  * These macros have historically been misnamed
  85  * virt here means link-address/program-address as embedded in object code.
  86  * And for ARC, link-addr = physical address
  87  */
  88 #define __pa(vaddr)  ((unsigned long)vaddr)
  89 #define __va(paddr)  ((void *)((unsigned long)(paddr)))
  90
  91 #define virt_to_page(kaddr)     \
  92         (mem_map + virt_to_pfn((kaddr) - CONFIG_LINUX_LINK_BASE))
  93
  94 #define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
  95
  96 /* Default Permissions for stack/heaps pages (Non Executable) */
  97 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
  98
  99 #define WANT_PAGE_VIRTUAL   1
 100
 101 #include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
 102 #include <asm-generic/getorder.h>
 103
 104 #endif /* !__ASSEMBLY__ */
 105
 106 #endif