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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
---|---|
2 | #ifndef __ASM_GENERIC_PAGE_H |
3 | #define __ASM_GENERIC_PAGE_H |
4 | /* |
5 | * Generic page.h implementation, for NOMMU architectures. |
6 | * This provides the dummy definitions for the memory management. |
7 | */ |
8 | |
9 | #ifdef CONFIG_MMU |
10 | #error need to provide a real asm/page.h |
11 | #endif |
12 | |
13 | |
14 | /* PAGE_SHIFT determines the page size */ |
15 | |
16 | #define PAGE_SHIFT 12 |
17 | #ifdef __ASSEMBLY__ |
18 | #define PAGE_SIZE (1 << PAGE_SHIFT) |
19 | #else |
20 | #define PAGE_SIZE (1UL << PAGE_SHIFT) |
21 | #endif |
22 | #define PAGE_MASK (~(PAGE_SIZE-1)) |
23 | |
24 | #include <asm/setup.h> |
25 | |
26 | #ifndef __ASSEMBLY__ |
27 | |
28 | #define clear_page(page) memset((page), 0, PAGE_SIZE) |
29 | #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) |
30 | |
31 | #define clear_user_page(page, vaddr, pg) clear_page(page) |
32 | #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) |
33 | |
34 | /* |
35 | * These are used to make use of C type-checking.. |
36 | */ |
37 | typedef struct { |
38 | unsigned long pte; |
39 | } pte_t; |
40 | typedef struct { |
41 | unsigned long pmd[16]; |
42 | } pmd_t; |
43 | typedef struct { |
44 | unsigned long pgd; |
45 | } pgd_t; |
46 | typedef struct { |
47 | unsigned long pgprot; |
48 | } pgprot_t; |
49 | typedef struct page *pgtable_t; |
50 | |
51 | #define pte_val(x) ((x).pte) |
52 | #define pmd_val(x) ((&x)->pmd[0]) |
53 | #define pgd_val(x) ((x).pgd) |
54 | #define pgprot_val(x) ((x).pgprot) |
55 | |
56 | #define __pte(x) ((pte_t) { (x) } ) |
57 | #define __pmd(x) ((pmd_t) { (x) } ) |
58 | #define __pgd(x) ((pgd_t) { (x) } ) |
59 | #define __pgprot(x) ((pgprot_t) { (x) } ) |
60 | |
61 | extern unsigned long memory_start; |
62 | extern unsigned long memory_end; |
63 | |
64 | #endif /* !__ASSEMBLY__ */ |
65 | |
66 | #define PAGE_OFFSET (0) |
67 | |
68 | #ifndef ARCH_PFN_OFFSET |
69 | #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) |
70 | #endif |
71 | |
72 | #ifndef __ASSEMBLY__ |
73 | |
74 | #define __va(x) ((void *)((unsigned long) (x))) |
75 | #define __pa(x) ((unsigned long) (x)) |
76 | |
77 | static inline unsigned long virt_to_pfn(const void *kaddr) |
78 | { |
79 | return __pa(kaddr) >> PAGE_SHIFT; |
80 | } |
81 | #define virt_to_pfn virt_to_pfn |
82 | static inline void *pfn_to_virt(unsigned long pfn) |
83 | { |
84 | return __va(pfn) << PAGE_SHIFT; |
85 | } |
86 | #define pfn_to_virt pfn_to_virt |
87 | |
88 | #define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr)) |
89 | #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) |
90 | |
91 | #ifndef page_to_phys |
92 | #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) |
93 | #endif |
94 | |
95 | #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ |
96 | ((void *)(kaddr) < (void *)memory_end)) |
97 | |
98 | #endif /* __ASSEMBLY__ */ |
99 | |
100 | #include <asm-generic/memory_model.h> |
101 | #include <asm-generic/getorder.h> |
102 | |
103 | #endif /* __ASM_GENERIC_PAGE_H */ |
104 |
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