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
11 #include <linux/const.h>
12
13 /* PAGE_SHIFT determines the page size */
14 #define PAGE_SHIFT 12
15 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
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;
35 typedef struct page *pgtable_t;
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 */
get_order(unsigned long size)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 /*
61 * The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff
62 * permanently to the physical addresses 0x00000000 -> 0x1fffffff when
63 * segmentation is enabled. We want to make use of this in order to
64 * minimize TLB pressure.
65 */
66 #define PAGE_OFFSET (0x80000000UL)
67
68 /*
69 * ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure
70 * is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here
71 * in that case, so we'll have to mask out the three most significant
72 * bits of the address instead...
73 *
74 * What's the difference between __pa() and virt_to_phys() anyway?
75 */
76 #define __pa(x) PHYSADDR(x)
77 #define __va(x) ((void *)(P1SEGADDR(x)))
78
79 #define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
80
81 #define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
82 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
83
84 #ifndef CONFIG_NEED_MULTIPLE_NODES
85
86 #define ARCH_PFN_OFFSET (CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
87
88 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr))
89 #endif /* CONFIG_NEED_MULTIPLE_NODES */
90
91 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
92 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
93
94 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
95 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
96
97 /*
98 * Memory above this physical address will be considered highmem.
99 */
100 #define HIGHMEM_START 0x20000000UL
101
102 #include <asm-generic/memory_model.h>
103
104 #endif /* __ASM_AVR32_PAGE_H */
105