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 /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */ 32 #define __HAVE_ARCH_GATE_AREA 1 33 34 /* 35 * The idmap and swapper page tables need some space reserved in the kernel 36 * image. Both require pgd, pud (4 levels only) and pmd tables to (section) 37 * map the kernel. With the 64K page configuration, swapper and idmap need to 38 * map to pte level. The swapper also maps the FDT (see __create_page_tables 39 * for more information). 40 */ 41 #ifdef CONFIG_ARM64_64K_PAGES 42 #define SWAPPER_PGTABLE_LEVELS (CONFIG_ARM64_PGTABLE_LEVELS) 43 #else 44 #define SWAPPER_PGTABLE_LEVELS (CONFIG_ARM64_PGTABLE_LEVELS - 1) 45 #endif 46 47 #define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE) 48 #define IDMAP_DIR_SIZE (SWAPPER_DIR_SIZE) 49 50 #ifndef __ASSEMBLY__ 51 52 #include <asm/pgtable-types.h> 53 54 extern void __cpu_clear_user_page(void *p, unsigned long user); 55 extern void __cpu_copy_user_page(void *to, const void *from, 56 unsigned long user); 57 extern void copy_page(void *to, const void *from); 58 extern void clear_page(void *to); 59 60 #define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr) 61 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr) 62 63 typedef struct page *pgtable_t; 64 65 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 66 extern int pfn_valid(unsigned long); 67 #endif 68 69 #include <asm/memory.h> 70 71 #endif /* !__ASSEMBLY__ */ 72 73 #define VM_DATA_DEFAULT_FLAGS \ 74 (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ 75 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 76 77 #include <asm-generic/getorder.h> 78 79 #endif 80