1 #ifndef _ASM_X86_PAGE_DEFS_H
2 #define _ASM_X86_PAGE_DEFS_H
3 
4 #include <linux/const.h>
5 #include <linux/types.h>
6 
7 /* PAGE_SHIFT determines the page size */
8 #define PAGE_SHIFT	12
9 #define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
10 #define PAGE_MASK	(~(PAGE_SIZE-1))
11 
12 #define __PHYSICAL_MASK		((phys_addr_t)((1ULL << __PHYSICAL_MASK_SHIFT) - 1))
13 #define __VIRTUAL_MASK		((1UL << __VIRTUAL_MASK_SHIFT) - 1)
14 
15 /* Cast PAGE_MASK to a signed type so that it is sign-extended if
16    virtual addresses are 32-bits but physical addresses are larger
17    (ie, 32-bit PAE). */
18 #define PHYSICAL_PAGE_MASK	(((signed long)PAGE_MASK) & __PHYSICAL_MASK)
19 
20 #define PMD_PAGE_SIZE		(_AC(1, UL) << PMD_SHIFT)
21 #define PMD_PAGE_MASK		(~(PMD_PAGE_SIZE-1))
22 
23 #define HPAGE_SHIFT		PMD_SHIFT
24 #define HPAGE_SIZE		(_AC(1,UL) << HPAGE_SHIFT)
25 #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
26 #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
27 
28 #define HUGE_MAX_HSTATE 2
29 
30 #define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)
31 
32 #define VM_DATA_DEFAULT_FLAGS \
33 	(((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
34 	 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
35 
36 #ifdef CONFIG_X86_64
37 #include <asm/page_64_types.h>
38 #else
39 #include <asm/page_32_types.h>
40 #endif	/* CONFIG_X86_64 */
41 
42 #ifndef __ASSEMBLY__
43 
44 extern int devmem_is_allowed(unsigned long pagenr);
45 
46 extern unsigned long max_low_pfn_mapped;
47 extern unsigned long max_pfn_mapped;
48 
get_max_mapped(void)49 static inline phys_addr_t get_max_mapped(void)
50 {
51 	return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
52 }
53 
54 extern unsigned long init_memory_mapping(unsigned long start,
55 					 unsigned long end);
56 
57 extern void initmem_init(void);
58 
59 #endif	/* !__ASSEMBLY__ */
60 
61 #endif	/* _ASM_X86_PAGE_DEFS_H */
62