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5f97f7f9 HS |
1 | /* |
2 | * Copyright (C) 2004-2006 Atmel Corporation | |
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 version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | #ifndef __ASM_AVR32_PAGE_H | |
9 | #define __ASM_AVR32_PAGE_H | |
10 | ||
e573ebb0 CG |
11 | #include <linux/const.h> |
12 | ||
5f97f7f9 HS |
13 | /* PAGE_SHIFT determines the page size */ |
14 | #define PAGE_SHIFT 12 | |
e573ebb0 | 15 | #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) |
5f97f7f9 HS |
16 | #define PAGE_MASK (~(PAGE_SIZE-1)) |
17 | #define PTE_MASK PAGE_MASK | |
18 | ||
19 | #ifndef __ASSEMBLY__ | |
20 | ||
21 | #include <asm/addrspace.h> | |
22 | ||
23 | extern void clear_page(void *to); | |
24 | extern void copy_page(void *to, void *from); | |
25 | ||
26 | #define clear_user_page(page, vaddr, pg) clear_page(page) | |
27 | #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) | |
28 | ||
29 | /* | |
30 | * These are used to make use of C type-checking.. | |
31 | */ | |
32 | typedef struct { unsigned long pte; } pte_t; | |
33 | typedef struct { unsigned long pgd; } pgd_t; | |
34 | typedef struct { unsigned long pgprot; } pgprot_t; | |
2f569afd | 35 | typedef struct page *pgtable_t; |
5f97f7f9 HS |
36 | |
37 | #define pte_val(x) ((x).pte) | |
38 | #define pgd_val(x) ((x).pgd) | |
39 | #define pgprot_val(x) ((x).pgprot) | |
40 | ||
41 | #define __pte(x) ((pte_t) { (x) }) | |
42 | #define __pgd(x) ((pgd_t) { (x) }) | |
43 | #define __pgprot(x) ((pgprot_t) { (x) }) | |
44 | ||
45 | /* FIXME: These should be removed soon */ | |
46 | extern unsigned long memory_start, memory_end; | |
47 | ||
48 | /* Pure 2^n version of get_order */ | |
49 | static inline int get_order(unsigned long size) | |
50 | { | |
51 | unsigned lz; | |
52 | ||
53 | size = (size - 1) >> PAGE_SHIFT; | |
54 | asm("clz %0, %1" : "=r"(lz) : "r"(size)); | |
55 | return 32 - lz; | |
56 | } | |
57 | ||
58 | #endif /* !__ASSEMBLY__ */ | |
59 | ||
60 | /* Align the pointer to the (next) page boundary */ | |
61 | #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) | |
62 | ||
63 | /* | |
64 | * The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff | |
65 | * permanently to the physical addresses 0x00000000 -> 0x1fffffff when | |
66 | * segmentation is enabled. We want to make use of this in order to | |
67 | * minimize TLB pressure. | |
68 | */ | |
69 | #define PAGE_OFFSET (0x80000000UL) | |
70 | ||
71 | /* | |
72 | * ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure | |
73 | * is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here | |
74 | * in that case, so we'll have to mask out the three most significant | |
75 | * bits of the address instead... | |
76 | * | |
77 | * What's the difference between __pa() and virt_to_phys() anyway? | |
78 | */ | |
79 | #define __pa(x) PHYSADDR(x) | |
80 | #define __va(x) ((void *)(P1SEGADDR(x))) | |
81 | ||
82 | #define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT) | |
83 | ||
84 | #define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT)) | |
85 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
86 | ||
87 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
88 | ||
89 | #define PHYS_PFN_OFFSET (CONFIG_PHYS_OFFSET >> PAGE_SHIFT) | |
90 | ||
91 | #define pfn_to_page(pfn) (mem_map + ((pfn) - PHYS_PFN_OFFSET)) | |
92 | #define page_to_pfn(page) ((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET) | |
93 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) | |
94 | #endif /* CONFIG_NEED_MULTIPLE_NODES */ | |
95 | ||
96 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
97 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
98 | ||
99 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ | |
100 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
101 | ||
102 | /* | |
103 | * Memory above this physical address will be considered highmem. | |
104 | */ | |
105 | #define HIGHMEM_START 0x20000000UL | |
106 | ||
5f97f7f9 | 107 | #endif /* __ASM_AVR32_PAGE_H */ |