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
53extern void __cpu_clear_user_page(void *p, unsigned long user);
54extern void __cpu_copy_user_page(void *to, const void *from,
55				 unsigned long user);
56extern void copy_page(void *to, const void *from);
57extern 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
62typedef struct page *pgtable_t;
63
64#ifdef CONFIG_HAVE_ARCH_PFN_VALID
65extern 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