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