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
  14 #ifndef __ASSEMBLY__
  15
  16 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  17 #define free_user_page(page, addr)      free_page(addr)
  18
  19 #define clear_page(paddr)               memset((paddr), 0, PAGE_SIZE)
  20 #define copy_page(to, from)             memcpy((to), (from), PAGE_SIZE)
  21
  22 struct vm_area_struct;
  23 struct page;
  24
  25 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  26
  27 void copy_user_highpage(struct page *to, struct page *from,
  28                         unsigned long u_vaddr, struct vm_area_struct *vma);
  29 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
  30
  31 #undef STRICT_MM_TYPECHECKS
  32
  33 #ifdef STRICT_MM_TYPECHECKS
  34 /*
  35  * These are used to make use of C type-checking..
  36  */
  37 typedef struct {
  38         unsigned long pte;
  39 } pte_t;
  40 typedef struct {
  41         unsigned long pgd;
  42 } pgd_t;
  43 typedef struct {
  44         unsigned long pgprot;
  45 } pgprot_t;
  46
  47 #define pte_val(x)      ((x).pte)
  48 #define pgd_val(x)      ((x).pgd)
  49 #define pgprot_val(x)   ((x).pgprot)
  50
  51 #define __pte(x)        ((pte_t) { (x) })
  52 #define __pgd(x)        ((pgd_t) { (x) })
  53 #define __pgprot(x)     ((pgprot_t) { (x) })
  54
  55 #define pte_pgprot(x) __pgprot(pte_val(x))
  56
  57 #else /* !STRICT_MM_TYPECHECKS */
  58
  59 #ifdef CONFIG_ARC_HAS_PAE40
  60 typedef unsigned long long pte_t;
  61 #else
  62 typedef unsigned long pte_t;
  63 #endif
  64 typedef unsigned long pgd_t;
  65 typedef unsigned long pgprot_t;
  66
  67 #define pte_val(x)      (x)
  68 #define pgd_val(x)      (x)
  69 #define pgprot_val(x)   (x)
  70 #define __pte(x)        (x)
  71 #define __pgd(x)        (x)
  72 #define __pgprot(x)     (x)
  73 #define pte_pgprot(x)   (x)
  74
  75 #endif
  76
  77 typedef pte_t * pgtable_t;
  78
  79 #define ARCH_PFN_OFFSET     (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)
  80
  81 #define pfn_valid(pfn)      (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  82
  83 /*
  84  * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
  85  *
  86  * These macros have historically been misnamed
  87  * virt here means link-address/program-address as embedded in object code.
  88  * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
  89  * 128th page, and virt_to_page( ) will return the struct page corresp to it.
  90  * mem_map[ ] is an array of struct page for each page frame in the system
  91  *
  92  * Independent of where linux is linked at, link-addr = physical address
  93  * So the old macro  __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
  94  * would have been wrong in case kernel is not at 0x8zs
  95  */
  96 #define __pa(vaddr)  ((unsigned long)vaddr)
  97 #define __va(paddr)  ((void *)((unsigned long)(paddr)))
  98
  99 #define virt_to_page(kaddr)     \
 100         (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))
 101
 102 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 103
 104 /* Default Permissions for stack/heaps pages (Non Executable) */
 105 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
 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