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 #include <linux/const.h>
  11
  12 /* PAGE_SHIFT determines the page size */
  13 #define PAGE_SHIFT      12
  14 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  15 #define PAGE_MASK       (~(PAGE_SIZE-1))
  16
  17 #ifndef __ASSEMBLY__
  18
  19 struct page;
  20
  21 #include <linux/types.h>
  22 #include <asm/vm-flags.h>
  23
  24 /*
  25  * These are used to make use of C type-checking..
  26  */
  27
  28 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  29 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  30
  31 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  32 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  33
  34 #if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
  35
  36 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  37 typedef struct { unsigned long pmd; } pmd_t;
  38 typedef struct { unsigned long pgd; } pgd_t;
  39 #define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
  40
  41 #define pte_get_bits(pte, bits) ((pte).pte_low & (bits))
  42 #define pte_set_bits(pte, bits) ((pte).pte_low |= (bits))
  43 #define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits))
  44 #define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \
  45                               smp_wmb(); \
  46                               (to).pte_low = (from).pte_low; })
  47 #define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high)
  48 #define pte_set_val(pte, phys, prot) \
  49         ({ (pte).pte_high = (phys) >> 32; \
  50            (pte).pte_low = (phys) | pgprot_val(prot); })
  51
  52 #define pmd_val(x)      ((x).pmd)
  53 #define __pmd(x) ((pmd_t) { (x) } )
  54
  55 typedef unsigned long long pfn_t;
  56 typedef unsigned long long phys_t;
  57
  58 #else
  59
  60 typedef struct { unsigned long pte; } pte_t;
  61 typedef struct { unsigned long pgd; } pgd_t;
  62
  63 #ifdef CONFIG_3_LEVEL_PGTABLES
  64 typedef struct { unsigned long pmd; } pmd_t;
  65 #define pmd_val(x)      ((x).pmd)
  66 #define __pmd(x) ((pmd_t) { (x) } )
  67 #endif
  68
  69 #define pte_val(x)      ((x).pte)
  70
  71
  72 #define pte_get_bits(p, bits) ((p).pte & (bits))
  73 #define pte_set_bits(p, bits) ((p).pte |= (bits))
  74 #define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
  75 #define pte_copy(to, from) ((to).pte = (from).pte)
  76 #define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
  77 #define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
  78
  79 typedef unsigned long pfn_t;
  80 typedef unsigned long phys_t;
  81
  82 #endif
  83
  84 typedef struct { unsigned long pgprot; } pgprot_t;
  85
  86 typedef struct page *pgtable_t;
  87
  88 #define pgd_val(x)      ((x).pgd)
  89 #define pgprot_val(x)   ((x).pgprot)
  90
  91 #define __pte(x) ((pte_t) { (x) } )
  92 #define __pgd(x) ((pgd_t) { (x) } )
  93 #define __pgprot(x)     ((pgprot_t) { (x) } )
  94
  95 extern unsigned long uml_physmem;
  96
  97 #define PAGE_OFFSET (uml_physmem)
  98 #define KERNELBASE PAGE_OFFSET
  99
 100 #define __va_space (8*1024*1024)
 101
 102 #include "mem.h"
 103
 104 /* Cast to unsigned long before casting to void * to avoid a warning from
 105  * mmap_kmem about cutting a long long down to a void *.  Not sure that
 106  * casting is the right thing, but 32-bit UML can't have 64-bit virtual
 107  * addresses
 108  */
 109 #define __pa(virt) to_phys((void *) (unsigned long) (virt))
 110 #define __va(phys) to_virt((unsigned long) (phys))
 111
 112 #define phys_to_pfn(p) ((pfn_t) ((p) >> PAGE_SHIFT))
 113 #define pfn_to_phys(pfn) ((phys_t) ((pfn) << PAGE_SHIFT))
 114
 115 #define pfn_valid(pfn) ((pfn) < max_mapnr)
 116 #define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
 117
 118 #include <asm-generic/memory_model.h>
 119 #include <asm-generic/page.h>
 120
 121 #endif  /* __ASSEMBLY__ */
 122 #endif  /* __UM_PAGE_H */