include/asm-avr32/page.h

   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 #ifdef __KERNEL__
  12
  13 /* PAGE_SHIFT determines the page size */
  14 #define PAGE_SHIFT      12
  15 #ifdef __ASSEMBLY__
  16 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  17 #else
  18 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  19 #endif
  20 #define PAGE_MASK       (~(PAGE_SIZE-1))
  21 #define PTE_MASK        PAGE_MASK
  22
  23 #ifndef __ASSEMBLY__
  24
  25 #include <asm/addrspace.h>
  26
  27 extern void clear_page(void *to);
  28 extern void copy_page(void *to, void *from);
  29
  30 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  31 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  32
  33 /*
  34  * These are used to make use of C type-checking..
  35  */
  36 typedef struct { unsigned long pte; } pte_t;
  37 typedef struct { unsigned long pgd; } pgd_t;
  38 typedef struct { unsigned long pgprot; } pgprot_t;
  39
  40 #define pte_val(x)              ((x).pte)
  41 #define pgd_val(x)              ((x).pgd)
  42 #define pgprot_val(x)           ((x).pgprot)
  43
  44 #define __pte(x)                ((pte_t) { (x) })
  45 #define __pgd(x)                ((pgd_t) { (x) })
  46 #define __pgprot(x)             ((pgprot_t) { (x) })
  47
  48 /* FIXME: These should be removed soon */
  49 extern unsigned long memory_start, memory_end;
  50
  51 /* Pure 2^n version of get_order */
  52 static inline int get_order(unsigned long size)
  53 {
  54         unsigned lz;
  55
  56         size = (size - 1) >> PAGE_SHIFT;
  57         asm("clz %0, %1" : "=r"(lz) : "r"(size));
  58         return 32 - lz;
  59 }
  60
  61 #endif /* !__ASSEMBLY__ */
  62
  63 /* Align the pointer to the (next) page boundary */
  64 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  65
  66 /*
  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.
  71  */
  72 #define PAGE_OFFSET             (0x80000000UL)
  73
  74 /*
  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...
  79  *
  80  * What's the difference between __pa() and virt_to_phys() anyway?
  81  */
  82 #define __pa(x)         PHYSADDR(x)
  83 #define __va(x)         ((void *)(P1SEGADDR(x)))
  84
  85 #define MAP_NR(addr)    (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
  86
  87 #define phys_to_page(phys)      (pfn_to_page(phys >> PAGE_SHIFT))
  88 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
  89
  90 #ifndef CONFIG_NEED_MULTIPLE_NODES
  91
  92 #define PHYS_PFN_OFFSET         (CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
  93
  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 */
  98
  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)
 101
 102 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE |   \
 103                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 104
 105 /*
 106  * Memory above this physical address will be considered highmem.
 107  */
 108 #define HIGHMEM_START           0x20000000UL
 109
 110 #endif /* __KERNEL__ */
 111
 112 #endif /* __ASM_AVR32_PAGE_H */