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5ead97c8 JF |
1 | #ifndef __XEN_PAGE_H |
2 | #define __XEN_PAGE_H | |
3 | ||
4 | #include <linux/pfn.h> | |
5 | ||
6 | #include <asm/uaccess.h> | |
7 | ||
8 | #include <xen/features.h> | |
9 | ||
10 | #ifdef CONFIG_X86_PAE | |
11 | /* Xen machine address */ | |
12 | typedef struct xmaddr { | |
13 | unsigned long long maddr; | |
14 | } xmaddr_t; | |
15 | ||
16 | /* Xen pseudo-physical address */ | |
17 | typedef struct xpaddr { | |
18 | unsigned long long paddr; | |
19 | } xpaddr_t; | |
20 | #else | |
21 | /* Xen machine address */ | |
22 | typedef struct xmaddr { | |
23 | unsigned long maddr; | |
24 | } xmaddr_t; | |
25 | ||
26 | /* Xen pseudo-physical address */ | |
27 | typedef struct xpaddr { | |
28 | unsigned long paddr; | |
29 | } xpaddr_t; | |
30 | #endif | |
31 | ||
32 | #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) | |
33 | #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) | |
34 | ||
35 | /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ | |
36 | #define INVALID_P2M_ENTRY (~0UL) | |
37 | #define FOREIGN_FRAME_BIT (1UL<<31) | |
38 | #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) | |
39 | ||
40 | extern unsigned long *phys_to_machine_mapping; | |
41 | ||
42 | static inline unsigned long pfn_to_mfn(unsigned long pfn) | |
43 | { | |
44 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
45 | return pfn; | |
46 | ||
47 | return phys_to_machine_mapping[(unsigned int)(pfn)] & | |
48 | ~FOREIGN_FRAME_BIT; | |
49 | } | |
50 | ||
51 | static inline int phys_to_machine_mapping_valid(unsigned long pfn) | |
52 | { | |
53 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
54 | return 1; | |
55 | ||
56 | return (phys_to_machine_mapping[pfn] != INVALID_P2M_ENTRY); | |
57 | } | |
58 | ||
59 | static inline unsigned long mfn_to_pfn(unsigned long mfn) | |
60 | { | |
61 | unsigned long pfn; | |
62 | ||
63 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
64 | return mfn; | |
65 | ||
66 | #if 0 | |
67 | if (unlikely((mfn >> machine_to_phys_order) != 0)) | |
68 | return max_mapnr; | |
69 | #endif | |
70 | ||
71 | pfn = 0; | |
72 | /* | |
73 | * The array access can fail (e.g., device space beyond end of RAM). | |
74 | * In such cases it doesn't matter what we return (we return garbage), | |
75 | * but we must handle the fault without crashing! | |
76 | */ | |
77 | __get_user(pfn, &machine_to_phys_mapping[mfn]); | |
78 | ||
79 | return pfn; | |
80 | } | |
81 | ||
82 | static inline xmaddr_t phys_to_machine(xpaddr_t phys) | |
83 | { | |
84 | unsigned offset = phys.paddr & ~PAGE_MASK; | |
85 | return XMADDR(PFN_PHYS((u64)pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); | |
86 | } | |
87 | ||
88 | static inline xpaddr_t machine_to_phys(xmaddr_t machine) | |
89 | { | |
90 | unsigned offset = machine.maddr & ~PAGE_MASK; | |
91 | return XPADDR(PFN_PHYS((u64)mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); | |
92 | } | |
93 | ||
94 | /* | |
95 | * We detect special mappings in one of two ways: | |
96 | * 1. If the MFN is an I/O page then Xen will set the m2p entry | |
97 | * to be outside our maximum possible pseudophys range. | |
98 | * 2. If the MFN belongs to a different domain then we will certainly | |
99 | * not have MFN in our p2m table. Conversely, if the page is ours, | |
100 | * then we'll have p2m(m2p(MFN))==MFN. | |
101 | * If we detect a special mapping then it doesn't have a 'struct page'. | |
102 | * We force !pfn_valid() by returning an out-of-range pointer. | |
103 | * | |
104 | * NB. These checks require that, for any MFN that is not in our reservation, | |
105 | * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | |
106 | * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | |
107 | * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | |
108 | * | |
109 | * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | |
110 | * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | |
111 | * require. In all the cases we care about, the FOREIGN_FRAME bit is | |
112 | * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | |
113 | */ | |
114 | static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | |
115 | { | |
116 | extern unsigned long max_mapnr; | |
117 | unsigned long pfn = mfn_to_pfn(mfn); | |
118 | if ((pfn < max_mapnr) | |
119 | && !xen_feature(XENFEAT_auto_translated_physmap) | |
120 | && (phys_to_machine_mapping[pfn] != mfn)) | |
121 | return max_mapnr; /* force !pfn_valid() */ | |
122 | return pfn; | |
123 | } | |
124 | ||
125 | static inline void set_phys_to_machine(unsigned long pfn, unsigned long mfn) | |
126 | { | |
127 | if (xen_feature(XENFEAT_auto_translated_physmap)) { | |
128 | BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY); | |
129 | return; | |
130 | } | |
131 | phys_to_machine_mapping[pfn] = mfn; | |
132 | } | |
133 | ||
134 | /* VIRT <-> MACHINE conversion */ | |
135 | #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | |
136 | #define virt_to_mfn(v) (pfn_to_mfn(PFN_DOWN(__pa(v)))) | |
137 | #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) | |
138 | ||
139 | #ifdef CONFIG_X86_PAE | |
140 | #define pte_mfn(_pte) (((_pte).pte_low >> PAGE_SHIFT) | \ | |
141 | (((_pte).pte_high & 0xfff) << (32-PAGE_SHIFT))) | |
142 | ||
143 | static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
144 | { | |
145 | pte_t pte; | |
146 | ||
147 | pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | | |
148 | (pgprot_val(pgprot) >> 32); | |
149 | pte.pte_high &= (__supported_pte_mask >> 32); | |
150 | pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)); | |
151 | pte.pte_low &= __supported_pte_mask; | |
152 | ||
153 | return pte; | |
154 | } | |
155 | ||
156 | static inline unsigned long long pte_val_ma(pte_t x) | |
157 | { | |
158 | return ((unsigned long long)x.pte_high << 32) | x.pte_low; | |
159 | } | |
160 | #define pmd_val_ma(v) ((v).pmd) | |
161 | #define pud_val_ma(v) ((v).pgd.pgd) | |
162 | #define __pte_ma(x) ((pte_t) { .pte_low = (x), .pte_high = (x)>>32 } ) | |
163 | #define __pmd_ma(x) ((pmd_t) { (x) } ) | |
164 | #else /* !X86_PAE */ | |
165 | #define pte_mfn(_pte) ((_pte).pte_low >> PAGE_SHIFT) | |
166 | #define mfn_pte(pfn, prot) __pte_ma(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
167 | #define pte_val_ma(x) ((x).pte_low) | |
168 | #define pmd_val_ma(v) ((v).pud.pgd.pgd) | |
169 | #define __pte_ma(x) ((pte_t) { (x) } ) | |
170 | #endif /* CONFIG_X86_PAE */ | |
171 | ||
172 | #define pgd_val_ma(x) ((x).pgd) | |
173 | ||
174 | ||
175 | xmaddr_t arbitrary_virt_to_machine(unsigned long address); | |
176 | void make_lowmem_page_readonly(void *vaddr); | |
177 | void make_lowmem_page_readwrite(void *vaddr); | |
178 | ||
179 | #endif /* __XEN_PAGE_H */ |