Linux Kernel  3.7.1
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page.h
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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 #ifndef __ASSEMBLY__
35 
36 #ifdef CONFIG_ARM64_64K_PAGES
37 #include <asm/pgtable-2level-types.h>
38 #else
39 #include <asm/pgtable-3level-types.h>
40 #endif
41 
42 extern void __cpu_clear_user_page(void *p, unsigned long user);
43 extern void __cpu_copy_user_page(void *to, const void *from,
44  unsigned long user);
45 extern void copy_page(void *to, const void *from);
46 extern void clear_page(void *to);
47 
48 #define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr)
49 #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
50 
51 typedef struct page *pgtable_t;
52 
53 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
54 extern int pfn_valid(unsigned long);
55 #endif
56 
57 #include <asm/memory.h>
58 
59 #endif /* !__ASSEMBLY__ */
60 
61 #define VM_DATA_DEFAULT_FLAGS \
62  (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
63  VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
64 
65 #include <asm-generic/getorder.h>
66 
67 #endif