include/asm-um/page.h

   1 /*
   2  * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
   3  * Copyright 2003 PathScale, Inc.
   4  * Licensed under the GPL
   5  */
   6
   7 #ifndef __UM_PAGE_H
   8 #define __UM_PAGE_H
   9
  10 struct page;
  11
  12 #include <linux/config.h>
  13 #include <asm/vm-flags.h>
  14
  15 /* PAGE_SHIFT determines the page size */
  16 #define PAGE_SHIFT      12
  17 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  18 #define PAGE_MASK       (~(PAGE_SIZE-1))
  19
  20 /*
  21  * These are used to make use of C type-checking..
  22  */
  23
  24 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  25 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  26
  27 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  28 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  29
  30 #if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
  31
  32 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  33 typedef struct { unsigned long long pmd; } pmd_t;
  34 typedef struct { unsigned long pgd; } pgd_t;
  35 #define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
  36
  37 #define pte_get_bits(pte, bits) ((pte).pte_low & (bits))
  38 #define pte_set_bits(pte, bits) ((pte).pte_low |= (bits))
  39 #define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits))
  40 #define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \
  41                               smp_wmb(); \
  42                               (to).pte_low = (from).pte_low; })
  43 #define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high)
  44 #define pte_set_val(pte, phys, prot) \
  45         ({ (pte).pte_high = (phys) >> 32; \
  46            (pte).pte_low = (phys) | pgprot_val(prot); })
  47
  48 #define pmd_val(x)      ((x).pmd)
  49 #define __pmd(x) ((pmd_t) { (x) } )
  50
  51 typedef unsigned long long pfn_t;
  52 typedef unsigned long long phys_t;
  53
  54 #else
  55
  56 typedef struct { unsigned long pte; } pte_t;
  57 typedef struct { unsigned long pgd; } pgd_t;
  58
  59 #ifdef CONFIG_3_LEVEL_PGTABLES
  60 typedef struct { unsigned long pmd; } pmd_t;
  61 #define pmd_val(x)      ((x).pmd)
  62 #define __pmd(x) ((pmd_t) { (x) } )
  63 #endif
  64
  65 #define pte_val(x)      ((x).pte)
  66
  67
  68 #define pte_get_bits(p, bits) ((p).pte & (bits))
  69 #define pte_set_bits(p, bits) ((p).pte |= (bits))
  70 #define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
  71 #define pte_copy(to, from) ((to).pte = (from).pte)
  72 #define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
  73 #define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
  74
  75 typedef unsigned long pfn_t;
  76 typedef unsigned long phys_t;
  77
  78 #endif
  79
  80 typedef struct { unsigned long pgprot; } pgprot_t;
  81
  82 #define pgd_val(x)      ((x).pgd)
  83 #define pgprot_val(x)   ((x).pgprot)
  84
  85 #define __pte(x) ((pte_t) { (x) } )
  86 #define __pgd(x) ((pgd_t) { (x) } )
  87 #define __pgprot(x)     ((pgprot_t) { (x) } )
  88
  89 /* to align the pointer to the (next) page boundary */
  90 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  91
  92 extern unsigned long uml_physmem;
  93
  94 #define PAGE_OFFSET (uml_physmem)
  95 #define KERNELBASE PAGE_OFFSET
  96
  97 #define __va_space (8*1024*1024)
  98
  99 extern unsigned long to_phys(void *virt);
 100 extern void *to_virt(unsigned long phys);
 101
 102 /* Cast to unsigned long before casting to void * to avoid a warning from
 103  * mmap_kmem about cutting a long long down to a void *.  Not sure that
 104  * casting is the right thing, but 32-bit UML can't have 64-bit virtual
 105  * addresses
 106  */
 107 #define __pa(virt) to_phys((void *) (unsigned long) virt)
 108 #define __va(phys) to_virt((unsigned long) phys)
 109
 110 #define page_to_pfn(page) ((page) - mem_map)
 111 #define pfn_to_page(pfn) (mem_map + (pfn))
 112
 113 #define phys_to_pfn(p) ((p) >> PAGE_SHIFT)
 114 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
 115
 116 #define pfn_valid(pfn) ((pfn) < max_mapnr)
 117 #define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
 118
 119 /* Pure 2^n version of get_order */
 120 static __inline__ int get_order(unsigned long size)
 121 {
 122         int order;
 123
 124         size = (size-1) >> (PAGE_SHIFT-1);
 125         order = -1;
 126         do {
 127                 size >>= 1;
 128                 order++;
 129         } while (size);
 130         return order;
 131 }
 132
 133 extern struct page *arch_validate(struct page *page, int mask, int order);
 134 #define HAVE_ARCH_VALIDATE
 135
 136 extern void arch_free_page(struct page *page, int order);
 137 #define HAVE_ARCH_FREE_PAGE
 138
 139 #endif