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Linux/arch/avr32/include/asm/page.h

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  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 */
 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 PHYS_PFN_OFFSET         (CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
 87 
 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 */
 92 
 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)
 95 
 96 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE |   \
 97                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 98 
 99 /*
100  * Memory above this physical address will be considered highmem.
101  */
102 #define HIGHMEM_START           0x20000000UL
103 
104 #endif /* __ASM_AVR32_PAGE_H */
105 

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