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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