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 79