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 <asm/pgtable-types.h>
  43
  44 extern void __cpu_clear_user_page(void *p, unsigned long user);
  45 extern void __cpu_copy_user_page(void *to, const void *from,
  46                                  unsigned long user);
  47 extern void copy_page(void *to, const void *from);
  48 extern void clear_page(void *to);
  49
  50 #define clear_user_page(addr,vaddr,pg)  __cpu_clear_user_page(addr, vaddr)
  51 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
  52
  53 typedef struct page *pgtable_t;
  54
  55 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
  56 extern int pfn_valid(unsigned long);
  57 #endif
  58
  59 #include <asm/memory.h>
  60
  61 #endif /* !__ASSEMBLY__ */
  62
  63 #define VM_DATA_DEFAULT_FLAGS \
  64         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
  65          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  66
  67 #include <asm-generic/getorder.h>
  68
  69 #endif