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b920de1b DH |
1 | /* MN10300 Page table definitions |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | #ifndef _ASM_PAGE_H | |
12 | #define _ASM_PAGE_H | |
13 | ||
14 | /* PAGE_SHIFT determines the page size */ | |
15 | #define PAGE_SHIFT 12 | |
16 | ||
17 | #ifndef __ASSEMBLY__ | |
18 | #define PAGE_SIZE (1UL << PAGE_SHIFT) | |
19 | #define PAGE_MASK (~(PAGE_SIZE - 1)) | |
20 | #else | |
21 | #define PAGE_SIZE +(1 << PAGE_SHIFT) /* unary plus marks an | |
22 | * immediate val not an addr */ | |
23 | #define PAGE_MASK +(~(PAGE_SIZE - 1)) | |
24 | #endif | |
25 | ||
26 | #ifdef __KERNEL__ | |
27 | #ifndef __ASSEMBLY__ | |
28 | ||
29 | #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) | |
30 | #define copy_page(to, from) memcpy((void *)(to), (void *)(from), PAGE_SIZE) | |
31 | ||
32 | #define clear_user_page(addr, vaddr, page) clear_page(addr) | |
33 | #define copy_user_page(vto, vfrom, vaddr, to) copy_page(vto, vfrom) | |
34 | ||
35 | /* | |
36 | * These are used to make use of C type-checking.. | |
37 | */ | |
38 | typedef struct { unsigned long pte; } pte_t; | |
39 | typedef struct { unsigned long pgd; } pgd_t; | |
40 | typedef struct { unsigned long pgprot; } pgprot_t; | |
41 | typedef struct page *pgtable_t; | |
42 | ||
43 | #define PTE_MASK PAGE_MASK | |
44 | #define HPAGE_SHIFT 22 | |
45 | ||
46 | #ifdef CONFIG_HUGETLB_PAGE | |
47 | #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) | |
48 | #define HPAGE_MASK (~(HPAGE_SIZE - 1)) | |
49 | #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
50 | #endif | |
51 | ||
52 | #define pte_val(x) ((x).pte) | |
53 | #define pgd_val(x) ((x).pgd) | |
54 | #define pgprot_val(x) ((x).pgprot) | |
55 | ||
56 | #define __pte(x) ((pte_t) { (x) }) | |
57 | #define __pgd(x) ((pgd_t) { (x) }) | |
58 | #define __pgprot(x) ((pgprot_t) { (x) }) | |
59 | ||
9849a569 | 60 | #define __ARCH_USE_5LEVEL_HACK |
b920de1b DH |
61 | #include <asm-generic/pgtable-nopmd.h> |
62 | ||
63 | #endif /* !__ASSEMBLY__ */ | |
64 | ||
b920de1b DH |
65 | /* |
66 | * This handles the memory map.. We could make this a config | |
67 | * option, but too many people screw it up, and too few need | |
68 | * it. | |
69 | * | |
70 | * A __PAGE_OFFSET of 0xC0000000 means that the kernel has | |
71 | * a virtual address space of one gigabyte, which limits the | |
72 | * amount of physical memory you can use to about 950MB. | |
73 | */ | |
74 | ||
75 | #ifndef __ASSEMBLY__ | |
76 | ||
77 | /* Pure 2^n version of get_order */ | |
78 | static inline int get_order(unsigned long size) __attribute__((const)); | |
79 | static inline int get_order(unsigned long size) | |
80 | { | |
81 | int order; | |
82 | ||
83 | size = (size - 1) >> (PAGE_SHIFT - 1); | |
84 | order = -1; | |
85 | do { | |
86 | size >>= 1; | |
87 | order++; | |
88 | } while (size); | |
89 | return order; | |
90 | } | |
91 | ||
92 | #endif /* __ASSEMBLY__ */ | |
93 | ||
94 | #include <asm/page_offset.h> | |
95 | ||
96 | #define __PAGE_OFFSET (PAGE_OFFSET_RAW) | |
97 | #define PAGE_OFFSET ((unsigned long) __PAGE_OFFSET) | |
98 | ||
99 | /* | |
100 | * main RAM and kernel working space are coincident at 0x90000000, but to make | |
101 | * life more interesting, there's also an uncached virtual shadow at 0xb0000000 | |
102 | * - these mappings are fixed in the MMU | |
103 | */ | |
104 | #define __pfn_disp (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT) | |
105 | ||
106 | #define __pa(x) ((unsigned long)(x)) | |
107 | #define __va(x) ((void *)(unsigned long)(x)) | |
108 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
109 | #define pfn_to_page(pfn) (mem_map + ((pfn) - __pfn_disp)) | |
110 | #define page_to_pfn(page) ((unsigned long)((page) - mem_map) + __pfn_disp) | |
d2c0f041 | 111 | #define __pfn_to_phys(pfn) PFN_PHYS(pfn) |
b920de1b DH |
112 | |
113 | #define pfn_valid(pfn) \ | |
114 | ({ \ | |
115 | unsigned long __pfn = (pfn) - __pfn_disp; \ | |
116 | __pfn < max_mapnr; \ | |
117 | }) | |
118 | ||
119 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
120 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
121 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
122 | ||
123 | #define VM_DATA_DEFAULT_FLAGS \ | |
124 | (VM_READ | VM_WRITE | \ | |
125 | ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ | |
126 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
127 | ||
128 | #endif /* __KERNEL__ */ | |
129 | ||
130 | #endif /* _ASM_PAGE_H */ |