LXR linux/arch/arm64/include/asm/page.h

   1/*
   2 * Based on arch/arm/include/asm/page.h
   3 *
   4 * Copyright (C) 1995-2003 Russell King
   5 * Copyright (C) 2012 ARM Ltd.
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19#ifndef __ASM_PAGE_H
  20#define __ASM_PAGE_H
  21
  22/* PAGE_SHIFT determines the page size */
  23/* CONT_SHIFT determines the number of pages which can be tracked together  */
  24#ifdef CONFIG_ARM64_64K_PAGES
  25#define PAGE_SHIFT              16
  26#define CONT_SHIFT              5
  27#elif defined(CONFIG_ARM64_16K_PAGES)
  28#define PAGE_SHIFT              14
  29#define CONT_SHIFT              7
  30#else
  31#define PAGE_SHIFT              12
  32#define CONT_SHIFT              4
  33#endif
  34#define PAGE_SIZE               (_AC(1, UL) << PAGE_SHIFT)
  35#define PAGE_MASK               (~(PAGE_SIZE-1))
  36
  37#define CONT_SIZE               (_AC(1, UL) << (CONT_SHIFT + PAGE_SHIFT))
  38#define CONT_MASK               (~(CONT_SIZE-1))
  39
  40#ifndef __ASSEMBLY__
  41
  42#include <linux/personality.h> /* for READ_IMPLIES_EXEC */
  43#include <asm/pgtable-types.h>
  44
  45extern void __cpu_clear_user_page(void *p, unsigned long user);
  46extern void __cpu_copy_user_page(void *to, const void *from,
  47                                 unsigned long user);
  48extern void copy_page(void *to, const void *from);
  49extern void clear_page(void *to);
  50
  51#define clear_user_page(addr,vaddr,pg)  __cpu_clear_user_page(addr, vaddr)
  52#define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
  53
  54typedef struct page *pgtable_t;
  55
  56#ifdef CONFIG_HAVE_ARCH_PFN_VALID
  57extern int pfn_valid(unsigned long);
  58#endif
  59
  60#include <asm/memory.h>
  61
  62#endif /* !__ASSEMBLY__ */
  63
  64#define VM_DATA_DEFAULT_FLAGS \
  65        (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
  66         VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  67
  68#include <asm-generic/getorder.h>
  69
  70#endif
  71