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#ifdef CONFIG_ARM64_64K_PAGES
  24#define PAGE_SHIFT              16
  25#else
  26#define PAGE_SHIFT              12
  27#endif
  28#define PAGE_SIZE               (_AC(1,UL) << PAGE_SHIFT)
  29#define PAGE_MASK               (~(PAGE_SIZE-1))
  30
  31/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
  32#define __HAVE_ARCH_GATE_AREA           1
  33
  34#ifndef __ASSEMBLY__
  35
  36#ifdef CONFIG_ARM64_64K_PAGES
  37#include <asm/pgtable-2level-types.h>
  38#else
  39#include <asm/pgtable-3level-types.h>
  40#endif
  41
  42extern void __cpu_clear_user_page(void *p, unsigned long user);
  43extern void __cpu_copy_user_page(void *to, const void *from,
  44                                 unsigned long user);
  45extern void copy_page(void *to, const void *from);
  46extern void clear_page(void *to);
  47
  48#define clear_user_page(addr,vaddr,pg)  __cpu_clear_user_page(addr, vaddr)
  49#define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
  50
  51typedef struct page *pgtable_t;
  52
  53#ifdef CONFIG_HAVE_ARCH_PFN_VALID
  54extern int pfn_valid(unsigned long);
  55#endif
  56
  57#include <asm/memory.h>
  58
  59#endif /* !__ASSEMBLY__ */
  60
  61#define VM_DATA_DEFAULT_FLAGS \
  62        (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
  63         VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  64
  65#include <asm-generic/getorder.h>
  66
  67#endif
  68