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Linux/arch/arm64/include/asm/page.h

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  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 
 45 extern void __cpu_clear_user_page(void *p, unsigned long user);
 46 extern void __cpu_copy_user_page(void *to, const void *from,
 47                                  unsigned long user);
 48 extern void copy_page(void *to, const void *from);
 49 extern 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 
 54 typedef struct page *pgtable_t;
 55 
 56 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 57 extern 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 

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