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

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  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/getorder.h>
120 
121 #endif  /* __ASSEMBLY__ */
122 
123 #ifdef CONFIG_X86_32
124 #define __HAVE_ARCH_GATE_AREA 1
125 #endif
126 
127 #endif  /* __UM_PAGE_H */
128 

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