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
11 #include <linux/const.h>
13 /* PAGE_SHIFT determines the page size */
15 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
16 #define PAGE_MASK (~(PAGE_SIZE-1))
17 #define PTE_MASK PAGE_MASK
21 #include <asm/addrspace.h>
23 extern void clear_page(void *to);
24 extern void copy_page(void *to, void *from);
26 #define clear_user_page(page, vaddr, pg) clear_page(page)
27 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
30 * These are used to make use of C type-checking..
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;
37 #define pte_val(x) ((x).pte)
38 #define pgd_val(x) ((x).pgd)
39 #define pgprot_val(x) ((x).pgprot)
41 #define __pte(x) ((pte_t) { (x) })
42 #define __pgd(x) ((pgd_t) { (x) })
43 #define __pgprot(x) ((pgprot_t) { (x) })
45 /* FIXME: These should be removed soon */
46 extern unsigned long memory_start, memory_end;
48 /* Pure 2^n version of get_order */
49 static inline int get_order(unsigned long size)
53 size = (size - 1) >> PAGE_SHIFT;
54 asm("clz %0, %1" : "=r"(lz) : "r"(size));
58 #endif /* !__ASSEMBLY__ */
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.
66 #define PAGE_OFFSET (0x80000000UL)
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...
74 * What's the difference between __pa() and virt_to_phys() anyway?
76 #define __pa(x) PHYSADDR(x)
77 #define __va(x) ((void *)(P1SEGADDR(x)))
79 #define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
81 #define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
82 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
84 #ifndef CONFIG_NEED_MULTIPLE_NODES
86 #define PHYS_PFN_OFFSET (CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
88 #define pfn_to_page(pfn) (mem_map + ((pfn) - PHYS_PFN_OFFSET))
89 #define page_to_pfn(page) ((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET)
90 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
91 #endif /* CONFIG_NEED_MULTIPLE_NODES */
93 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
94 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
96 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
97 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
100 * Memory above this physical address will be considered highmem.
102 #define HIGHMEM_START 0x20000000UL
104 #endif /* __ASM_AVR32_PAGE_H */