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