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 /*
  32  * The idmap and swapper page tables need some space reserved in the kernel
  33  * image. Both require pgd, pud (4 levels only) and pmd tables to (section)
  34  * map the kernel. With the 64K page configuration, swapper and idmap need to
  35  * map to pte level. The swapper also maps the FDT (see __create_page_tables
  36  * for more information). Note that the number of ID map translation levels
  37  * could be increased on the fly if system RAM is out of reach for the default
  38  * VA range, so 3 pages are reserved in all cases.
  39  */
  40 #ifdef CONFIG_ARM64_64K_PAGES
  41 #define SWAPPER_PGTABLE_LEVELS  (CONFIG_PGTABLE_LEVELS)
  42 #else
  43 #define SWAPPER_PGTABLE_LEVELS  (CONFIG_PGTABLE_LEVELS - 1)
  44 #endif
  45
  46 #define SWAPPER_DIR_SIZE        (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE)
  47 #define IDMAP_DIR_SIZE          (3 * PAGE_SIZE)
  48
  49 #ifndef __ASSEMBLY__
  50
  51 #include <asm/pgtable-types.h>
  52
  53 extern void __cpu_clear_user_page(void *p, unsigned long user);
  54 extern void __cpu_copy_user_page(void *to, const void *from,
  55                                  unsigned long user);
  56 extern void copy_page(void *to, const void *from);
  57 extern void clear_page(void *to);
  58
  59 #define clear_user_page(addr,vaddr,pg)  __cpu_clear_user_page(addr, vaddr)
  60 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
  61
  62 typedef struct page *pgtable_t;
  63
  64 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
  65 extern int pfn_valid(unsigned long);
  66 #endif
  67
  68 #include <asm/memory.h>
  69
  70 #endif /* !__ASSEMBLY__ */
  71
  72 #define VM_DATA_DEFAULT_FLAGS \
  73         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
  74          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  75
  76 #include <asm-generic/getorder.h>
  77
  78 #endif