LXR linux/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
  22struct vm_area_struct;
  23struct page;
  24
  25#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  26
  27void copy_user_highpage(struct page *to, struct page *from,
  28                        unsigned long u_vaddr, struct vm_area_struct *vma);
  29void 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 */
  37typedef struct {
  38        unsigned long pte;
  39} pte_t;
  40typedef struct {
  41        unsigned long pgd;
  42} pgd_t;
  43typedef struct {
  44        unsigned long pgprot;
  45} pgprot_t;
  46typedef unsigned long pgtable_t;
  47
  48#define pte_val(x)      ((x).pte)
  49#define pgd_val(x)      ((x).pgd)
  50#define pgprot_val(x)   ((x).pgprot)
  51
  52#define __pte(x)        ((pte_t) { (x) })
  53#define __pgd(x)        ((pgd_t) { (x) })
  54#define __pgprot(x)     ((pgprot_t) { (x) })
  55
  56#define pte_pgprot(x) __pgprot(pte_val(x))
  57
  58#else /* !STRICT_MM_TYPECHECKS */
  59
  60typedef unsigned long pte_t;
  61typedef unsigned long pgd_t;
  62typedef unsigned long pgprot_t;
  63typedef unsigned long pgtable_t;
  64
  65#define pte_val(x)      (x)
  66#define pgd_val(x)      (x)
  67#define pgprot_val(x)   (x)
  68#define __pte(x)        (x)
  69#define __pgprot(x)     (x)
  70#define pte_pgprot(x)   (x)
  71
  72#endif
  73
  74#define ARCH_PFN_OFFSET     (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)
  75
  76#define pfn_valid(pfn)      (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  77
  78/*
  79 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
  80 *
  81 * These macros have historically been misnamed
  82 * virt here means link-address/program-address as embedded in object code.
  83 * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
  84 * 128th page, and virt_to_page( ) will return the struct page corresp to it.
  85 * mem_map[ ] is an array of struct page for each page frame in the system
  86 *
  87 * Independent of where linux is linked at, link-addr = physical address
  88 * So the old macro  __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
  89 * would have been wrong in case kernel is not at 0x8zs
  90 */
  91#define __pa(vaddr)  ((unsigned long)vaddr)
  92#define __va(paddr)  ((void *)((unsigned long)(paddr)))
  93
  94#define virt_to_page(kaddr)     \
  95        (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))
  96
  97#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  98
  99/* Default Permissions for stack/heaps pages (Non Executable) */
 100#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
 101
 102#define WANT_PAGE_VIRTUAL   1
 103
 104#include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
 105#include <asm-generic/getorder.h>
 106
 107#endif /* !__ASSEMBLY__ */
 108
 109#endif
 110