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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> | |
9a8fd558 CZ |
17 | |
18 | /* | |
19 | * PAGE_SHIFT determines the page size | |
20 | * PAGE_ALIGN(x) aligns the pointer to the (next) page boundary | |
21 | */ | |
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 | * These are used to make use of C type-checking.. | |
39 | */ | |
40 | ||
41 | typedef struct { unsigned long pte; } pte_t; /* page table entry */ | |
42 | typedef struct { unsigned long pgd; } pgd_t; /* PGD table entry */ | |
43 | typedef struct { unsigned long pgprot; } pgprot_t; | |
44 | ||
45 | #define pte_val(x) ((x).pte) | |
46 | #define pgd_val(x) ((x).pgd) | |
47 | #define pgprot_val(x) ((x).pgprot) | |
48 | ||
49 | #define __pte(x) ((pte_t) { (x) } ) | |
50 | #define __pgd(x) ((pgd_t) { (x) } ) | |
51 | #define __pgprot(x) ((pgprot_t) { (x) } ) | |
52 | ||
53 | /* | |
54 | * Pure 2^n version of get_order | |
55 | */ | |
56 | ||
d99cf715 | 57 | static inline int get_order(unsigned long size) |
9a8fd558 CZ |
58 | { |
59 | int order; | |
60 | #ifndef XCHAL_HAVE_NSU | |
61 | unsigned long x1, x2, x4, x8, x16; | |
62 | ||
63 | size = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
64 | x1 = size & 0xAAAAAAAA; | |
65 | x2 = size & 0xCCCCCCCC; | |
66 | x4 = size & 0xF0F0F0F0; | |
67 | x8 = size & 0xFF00FF00; | |
68 | x16 = size & 0xFFFF0000; | |
69 | order = x2 ? 2 : 0; | |
70 | order += (x16 != 0) * 16; | |
71 | order += (x8 != 0) * 8; | |
72 | order += (x4 != 0) * 4; | |
73 | order += (x1 != 0); | |
74 | ||
75 | return order; | |
76 | #else | |
77 | size = (size - 1) >> PAGE_SHIFT; | |
78 | asm ("nsau %0, %1" : "=r" (order) : "r" (size)); | |
79 | return 32 - order; | |
80 | #endif | |
81 | } | |
82 | ||
83 | ||
84 | struct page; | |
85 | extern void clear_page(void *page); | |
86 | extern void copy_page(void *to, void *from); | |
87 | ||
88 | /* | |
89 | * If we have cache aliasing and writeback caches, we might have to do | |
90 | * some extra work | |
91 | */ | |
92 | ||
93 | #if (DCACHE_WAY_SIZE > PAGE_SIZE) | |
94 | void clear_user_page(void *addr, unsigned long vaddr, struct page* page); | |
95 | void copy_user_page(void *to,void* from,unsigned long vaddr,struct page* page); | |
96 | #else | |
97 | # define clear_user_page(page,vaddr,pg) clear_page(page) | |
98 | # define copy_user_page(to, from, vaddr, pg) copy_page(to, from) | |
99 | #endif | |
100 | ||
101 | /* | |
102 | * This handles the memory map. We handle pages at | |
103 | * XCHAL_KSEG_CACHED_VADDR for kernels with 32 bit address space. | |
104 | * These macros are for conversion of kernel address, not user | |
105 | * addresses. | |
106 | */ | |
107 | ||
108 | #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET) | |
109 | #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) | |
110 | #define pfn_valid(pfn) ((unsigned long)pfn < max_mapnr) | |
655a0443 | 111 | #ifdef CONFIG_DISCONTIGMEM |
9a8fd558 CZ |
112 | # error CONFIG_DISCONTIGMEM not supported |
113 | #endif | |
114 | ||
115 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
116 | #define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) | |
117 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
118 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
119 | ||
120 | #define WANT_PAGE_VIRTUAL | |
121 | ||
122 | ||
123 | #endif /* __ASSEMBLY__ */ | |
124 | ||
125 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
126 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
127 | ||
128 | #endif /* __KERNEL__ */ | |
655a0443 | 129 | #include <asm-generic/memory_model.h> |
9a8fd558 | 130 | #endif /* _XTENSA_PAGE_H */ |