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 #define __PHYSICAL_START	ALIGN(CONFIG_PHYSICAL_START, \
37 				      CONFIG_PHYSICAL_ALIGN)
38 
39 #define __START_KERNEL		(__START_KERNEL_map + __PHYSICAL_START)
40 
41 #ifdef CONFIG_X86_64
42 #include <asm/page_64_types.h>
43 #define IOREMAP_MAX_ORDER       (PUD_SHIFT)
44 #else
45 #include <asm/page_32_types.h>
46 #define IOREMAP_MAX_ORDER       (PMD_SHIFT)
47 #endif	/* CONFIG_X86_64 */
48 
49 #ifndef __ASSEMBLY__
50 
51 extern int devmem_is_allowed(unsigned long pagenr);
52 
53 extern unsigned long max_low_pfn_mapped;
54 extern unsigned long max_pfn_mapped;
55 
get_max_mapped(void)56 static inline phys_addr_t get_max_mapped(void)
57 {
58 	return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
59 }
60 
61 bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn);
62 
63 extern unsigned long init_memory_mapping(unsigned long start,
64 					 unsigned long end);
65 
66 extern void initmem_init(void);
67 
68 #endif	/* !__ASSEMBLY__ */
69 
70 #endif	/* _ASM_X86_PAGE_DEFS_H */
71