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9a8fd558 CZ |
1 | /* |
2 | * linux/include/asm-xtensa/page.h | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Copyright (C) 2001 - 2005 Tensilica Inc. | |
9 | */ | |
10 | ||
11 | #ifndef _XTENSA_PAGE_H | |
12 | #define _XTENSA_PAGE_H | |
13 | ||
14 | #ifdef __KERNEL__ | |
15 | ||
16 | #include <asm/processor.h> | |
17 | #include <linux/config.h> | |
18 | ||
19 | /* | |
20 | * PAGE_SHIFT determines the page size | |
21 | * PAGE_ALIGN(x) aligns the pointer to the (next) page boundary | |
22 | */ | |
23 | #define PAGE_SHIFT XCHAL_MMU_MIN_PTE_PAGE_SIZE | |
24 | #define PAGE_SIZE (1 << PAGE_SHIFT) | |
25 | #define PAGE_MASK (~(PAGE_SIZE-1)) | |
26 | #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE - 1) & PAGE_MASK) | |
27 | ||
28 | #define DCACHE_WAY_SIZE (XCHAL_DCACHE_SIZE / XCHAL_DCACHE_WAYS) | |
29 | #define PAGE_OFFSET XCHAL_KSEG_CACHED_VADDR | |
30 | ||
31 | #ifdef __ASSEMBLY__ | |
32 | ||
33 | #define __pgprot(x) (x) | |
34 | ||
35 | #else | |
36 | ||
37 | ||
38 | /* | |
39 | * These are used to make use of C type-checking.. | |
40 | */ | |
41 | typedef struct { unsigned long pte; } pte_t; /* page table entry */ | |
42 | typedef struct { unsigned long pmd; } pmd_t; /* PMD table entry */ | |
43 | typedef struct { unsigned long pgd; } pgd_t; /* PGD table entry */ | |
44 | typedef struct { unsigned long pgprot; } pgprot_t; | |
45 | ||
46 | #define pte_val(x) ((x).pte) | |
47 | #define pmd_val(x) ((x).pmd) | |
48 | #define pgd_val(x) ((x).pgd) | |
49 | #define pgprot_val(x) ((x).pgprot) | |
50 | ||
51 | #define __pte(x) ((pte_t) { (x) } ) | |
52 | #define __pmd(x) ((pmd_t) { (x) } ) | |
53 | #define __pgd(x) ((pgd_t) { (x) } ) | |
54 | #define __pgprot(x) ((pgprot_t) { (x) } ) | |
55 | ||
56 | /* | |
57 | * Pure 2^n version of get_order | |
58 | */ | |
59 | extern __inline__ int get_order(unsigned long size) | |
60 | { | |
61 | int order; | |
62 | #ifndef XCHAL_HAVE_NSU | |
63 | unsigned long x1, x2, x4, x8, x16; | |
64 | ||
65 | size = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
66 | x1 = size & 0xAAAAAAAA; | |
67 | x2 = size & 0xCCCCCCCC; | |
68 | x4 = size & 0xF0F0F0F0; | |
69 | x8 = size & 0xFF00FF00; | |
70 | x16 = size & 0xFFFF0000; | |
71 | order = x2 ? 2 : 0; | |
72 | order += (x16 != 0) * 16; | |
73 | order += (x8 != 0) * 8; | |
74 | order += (x4 != 0) * 4; | |
75 | order += (x1 != 0); | |
76 | ||
77 | return order; | |
78 | #else | |
79 | size = (size - 1) >> PAGE_SHIFT; | |
80 | asm ("nsau %0, %1" : "=r" (order) : "r" (size)); | |
81 | return 32 - order; | |
82 | #endif | |
83 | } | |
84 | ||
85 | ||
86 | struct page; | |
87 | extern void clear_page(void *page); | |
88 | extern void copy_page(void *to, void *from); | |
89 | ||
90 | /* | |
91 | * If we have cache aliasing and writeback caches, we might have to do | |
92 | * some extra work | |
93 | */ | |
94 | ||
95 | #if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK | |
96 | void clear_user_page(void *addr, unsigned long vaddr, struct page* page); | |
97 | void copy_user_page(void *to, void* from, unsigned long vaddr, struct page* page); | |
98 | #else | |
99 | # define clear_user_page(page,vaddr,pg) clear_page(page) | |
100 | # define copy_user_page(to, from, vaddr, pg) copy_page(to, from) | |
101 | #endif | |
102 | ||
103 | ||
104 | /* | |
105 | * This handles the memory map. We handle pages at | |
106 | * XCHAL_KSEG_CACHED_VADDR for kernels with 32 bit address space. | |
107 | * These macros are for conversion of kernel address, not user | |
108 | * addresses. | |
109 | */ | |
110 | ||
111 | #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET) | |
112 | #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) | |
113 | #define pfn_valid(pfn) ((unsigned long)pfn < max_mapnr) | |
114 | #ifndef CONFIG_DISCONTIGMEM | |
115 | # define pfn_to_page(pfn) (mem_map + (pfn)) | |
116 | # define page_to_pfn(page) ((unsigned long)((page) - mem_map)) | |
117 | #else | |
118 | # error CONFIG_DISCONTIGMEM not supported | |
119 | #endif | |
120 | ||
121 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
122 | #define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) | |
123 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
124 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
125 | ||
126 | #define WANT_PAGE_VIRTUAL | |
127 | ||
128 | ||
129 | #endif /* __ASSEMBLY__ */ | |
130 | ||
131 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
132 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
133 | ||
134 | #endif /* __KERNEL__ */ | |
135 | #endif /* _XTENSA_PAGE_H */ |