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 #include <linux/const.h> 23 24 /* PAGE_SHIFT determines the page size */ 25 /* CONT_SHIFT determines the number of pages which can be tracked together */ 26 #ifdef CONFIG_ARM64_64K_PAGES 27 #define PAGE_SHIFT 16 28 #define CONT_SHIFT 5 29 #elif defined(CONFIG_ARM64_16K_PAGES) 30 #define PAGE_SHIFT 14 31 #define CONT_SHIFT 7 32 #else 33 #define PAGE_SHIFT 12 34 #define CONT_SHIFT 4 35 #endif 36 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 37 #define PAGE_MASK (~(PAGE_SIZE-1)) 38 39 #define CONT_SIZE (_AC(1, UL) << (CONT_SHIFT + PAGE_SHIFT)) 40 #define CONT_MASK (~(CONT_SIZE-1)) 41 42 #ifndef __ASSEMBLY__ 43 44 #include <linux/personality.h> /* for READ_IMPLIES_EXEC */ 45 #include <asm/pgtable-types.h> 46 47 extern void __cpu_clear_user_page(void *p, unsigned long user); 48 extern void __cpu_copy_user_page(void *to, const void *from, 49 unsigned long user); 50 extern void copy_page(void *to, const void *from); 51 extern void clear_page(void *to); 52 53 #define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr) 54 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr) 55 56 typedef struct page *pgtable_t; 57 58 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 59 extern int pfn_valid(unsigned long); 60 #endif 61 62 #include <asm/memory.h> 63 64 #endif /* !__ASSEMBLY__ */ 65 66 #define VM_DATA_DEFAULT_FLAGS \ 67 (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ 68 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 69 70 #include <asm-generic/getorder.h> 71 72 #endif 73