2 * Based on arch/arm/include/asm/page.h
4 * Copyright (C) 1995-2003 Russell King
5 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
22 /* PAGE_SHIFT determines the page size */
23 #ifdef CONFIG_ARM64_64K_PAGES
28 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
29 #define PAGE_MASK (~(PAGE_SIZE-1))
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.
40 #ifdef CONFIG_ARM64_64K_PAGES
41 #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS)
43 #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1)
46 #define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE)
47 #define IDMAP_DIR_SIZE (3 * PAGE_SIZE)
51 #include <asm/pgtable-types.h>
53 extern void __cpu_clear_user_page(void *p, unsigned long user);
54 extern void __cpu_copy_user_page(void *to, const void *from,
56 extern void copy_page(void *to, const void *from);
57 extern void clear_page(void *to);
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)
62 typedef struct page *pgtable_t;
64 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
65 extern int pfn_valid(unsigned long);
68 #include <asm/memory.h>
70 #endif /* !__ASSEMBLY__ */
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)
76 #include <asm-generic/getorder.h>