xref: /openbmc/linux/arch/arm64/include/asm/page.h (revision abfbd895)
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 /* CONT_SHIFT determines the number of pages which can be tracked together  */
24 #ifdef CONFIG_ARM64_64K_PAGES
25 #define PAGE_SHIFT		16
26 #define CONT_SHIFT		5
27 #elif defined(CONFIG_ARM64_16K_PAGES)
28 #define PAGE_SHIFT		14
29 #define CONT_SHIFT		7
30 #else
31 #define PAGE_SHIFT		12
32 #define CONT_SHIFT		4
33 #endif
34 #define PAGE_SIZE		(_AC(1, UL) << PAGE_SHIFT)
35 #define PAGE_MASK		(~(PAGE_SIZE-1))
36 
37 #define CONT_SIZE		(_AC(1, UL) << (CONT_SHIFT + PAGE_SHIFT))
38 #define CONT_MASK		(~(CONT_SIZE-1))
39 
40 #ifndef __ASSEMBLY__
41 
42 #include <asm/pgtable-types.h>
43 
44 extern void __cpu_clear_user_page(void *p, unsigned long user);
45 extern void __cpu_copy_user_page(void *to, const void *from,
46 				 unsigned long user);
47 extern void copy_page(void *to, const void *from);
48 extern void clear_page(void *to);
49 
50 #define clear_user_page(addr,vaddr,pg)  __cpu_clear_user_page(addr, vaddr)
51 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
52 
53 typedef struct page *pgtable_t;
54 
55 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
56 extern int pfn_valid(unsigned long);
57 #endif
58 
59 #include <asm/memory.h>
60 
61 #endif /* !__ASSEMBLY__ */
62 
63 #define VM_DATA_DEFAULT_FLAGS \
64 	(((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
65 	 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
66 
67 #include <asm-generic/getorder.h>
68 
69 #endif
70