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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> | |
dfb68689 | 7 | #include <asm/pgtable.h> |
5ead97c8 JF |
8 | |
9 | #include <xen/features.h> | |
10 | ||
11 | #ifdef CONFIG_X86_PAE | |
12 | /* Xen machine address */ | |
13 | typedef struct xmaddr { | |
14 | unsigned long long maddr; | |
15 | } xmaddr_t; | |
16 | ||
17 | /* Xen pseudo-physical address */ | |
18 | typedef struct xpaddr { | |
19 | unsigned long long paddr; | |
20 | } xpaddr_t; | |
21 | #else | |
22 | /* Xen machine address */ | |
23 | typedef struct xmaddr { | |
24 | unsigned long maddr; | |
25 | } xmaddr_t; | |
26 | ||
27 | /* Xen pseudo-physical address */ | |
28 | typedef struct xpaddr { | |
29 | unsigned long paddr; | |
30 | } xpaddr_t; | |
31 | #endif | |
32 | ||
33 | #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) | |
34 | #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) | |
35 | ||
36 | /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ | |
37 | #define INVALID_P2M_ENTRY (~0UL) | |
38 | #define FOREIGN_FRAME_BIT (1UL<<31) | |
39 | #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) | |
40 | ||
41 | extern unsigned long *phys_to_machine_mapping; | |
42 | ||
43 | static inline unsigned long pfn_to_mfn(unsigned long pfn) | |
44 | { | |
45 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
46 | return pfn; | |
47 | ||
48 | return phys_to_machine_mapping[(unsigned int)(pfn)] & | |
49 | ~FOREIGN_FRAME_BIT; | |
50 | } | |
51 | ||
52 | static inline int phys_to_machine_mapping_valid(unsigned long pfn) | |
53 | { | |
54 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
55 | return 1; | |
56 | ||
57 | return (phys_to_machine_mapping[pfn] != INVALID_P2M_ENTRY); | |
58 | } | |
59 | ||
60 | static inline unsigned long mfn_to_pfn(unsigned long mfn) | |
61 | { | |
62 | unsigned long pfn; | |
63 | ||
64 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
65 | return mfn; | |
66 | ||
67 | #if 0 | |
68 | if (unlikely((mfn >> machine_to_phys_order) != 0)) | |
69 | return max_mapnr; | |
70 | #endif | |
71 | ||
72 | pfn = 0; | |
73 | /* | |
74 | * The array access can fail (e.g., device space beyond end of RAM). | |
75 | * In such cases it doesn't matter what we return (we return garbage), | |
76 | * but we must handle the fault without crashing! | |
77 | */ | |
78 | __get_user(pfn, &machine_to_phys_mapping[mfn]); | |
79 | ||
80 | return pfn; | |
81 | } | |
82 | ||
83 | static inline xmaddr_t phys_to_machine(xpaddr_t phys) | |
84 | { | |
85 | unsigned offset = phys.paddr & ~PAGE_MASK; | |
86 | return XMADDR(PFN_PHYS((u64)pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); | |
87 | } | |
88 | ||
89 | static inline xpaddr_t machine_to_phys(xmaddr_t machine) | |
90 | { | |
91 | unsigned offset = machine.maddr & ~PAGE_MASK; | |
92 | return XPADDR(PFN_PHYS((u64)mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); | |
93 | } | |
94 | ||
95 | /* | |
96 | * We detect special mappings in one of two ways: | |
97 | * 1. If the MFN is an I/O page then Xen will set the m2p entry | |
98 | * to be outside our maximum possible pseudophys range. | |
99 | * 2. If the MFN belongs to a different domain then we will certainly | |
100 | * not have MFN in our p2m table. Conversely, if the page is ours, | |
101 | * then we'll have p2m(m2p(MFN))==MFN. | |
102 | * If we detect a special mapping then it doesn't have a 'struct page'. | |
103 | * We force !pfn_valid() by returning an out-of-range pointer. | |
104 | * | |
105 | * NB. These checks require that, for any MFN that is not in our reservation, | |
106 | * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | |
107 | * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | |
108 | * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | |
109 | * | |
110 | * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | |
111 | * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | |
112 | * require. In all the cases we care about, the FOREIGN_FRAME bit is | |
113 | * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | |
114 | */ | |
115 | static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | |
116 | { | |
117 | extern unsigned long max_mapnr; | |
118 | unsigned long pfn = mfn_to_pfn(mfn); | |
119 | if ((pfn < max_mapnr) | |
120 | && !xen_feature(XENFEAT_auto_translated_physmap) | |
121 | && (phys_to_machine_mapping[pfn] != mfn)) | |
122 | return max_mapnr; /* force !pfn_valid() */ | |
123 | return pfn; | |
124 | } | |
125 | ||
126 | static inline void set_phys_to_machine(unsigned long pfn, unsigned long mfn) | |
127 | { | |
128 | if (xen_feature(XENFEAT_auto_translated_physmap)) { | |
129 | BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY); | |
130 | return; | |
131 | } | |
132 | phys_to_machine_mapping[pfn] = mfn; | |
133 | } | |
134 | ||
135 | /* VIRT <-> MACHINE conversion */ | |
136 | #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | |
137 | #define virt_to_mfn(v) (pfn_to_mfn(PFN_DOWN(__pa(v)))) | |
138 | #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) | |
139 | ||
140 | #ifdef CONFIG_X86_PAE | |
141 | #define pte_mfn(_pte) (((_pte).pte_low >> PAGE_SHIFT) | \ | |
142 | (((_pte).pte_high & 0xfff) << (32-PAGE_SHIFT))) | |
143 | ||
144 | static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
145 | { | |
146 | pte_t pte; | |
147 | ||
148 | pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | | |
149 | (pgprot_val(pgprot) >> 32); | |
150 | pte.pte_high &= (__supported_pte_mask >> 32); | |
151 | pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)); | |
152 | pte.pte_low &= __supported_pte_mask; | |
153 | ||
154 | return pte; | |
155 | } | |
156 | ||
157 | static inline unsigned long long pte_val_ma(pte_t x) | |
158 | { | |
c8e5393a | 159 | return x.pte; |
5ead97c8 JF |
160 | } |
161 | #define pmd_val_ma(v) ((v).pmd) | |
162 | #define pud_val_ma(v) ((v).pgd.pgd) | |
c8e5393a | 163 | #define __pte_ma(x) ((pte_t) { .pte = (x) }) |
5ead97c8 JF |
164 | #define __pmd_ma(x) ((pmd_t) { (x) } ) |
165 | #else /* !X86_PAE */ | |
166 | #define pte_mfn(_pte) ((_pte).pte_low >> PAGE_SHIFT) | |
167 | #define mfn_pte(pfn, prot) __pte_ma(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
c8e5393a | 168 | #define pte_val_ma(x) ((x).pte) |
5ead97c8 JF |
169 | #define pmd_val_ma(v) ((v).pud.pgd.pgd) |
170 | #define __pte_ma(x) ((pte_t) { (x) } ) | |
171 | #endif /* CONFIG_X86_PAE */ | |
172 | ||
173 | #define pgd_val_ma(x) ((x).pgd) | |
174 | ||
175 | ||
176 | xmaddr_t arbitrary_virt_to_machine(unsigned long address); | |
177 | void make_lowmem_page_readonly(void *vaddr); | |
178 | void make_lowmem_page_readwrite(void *vaddr); | |
179 | ||
180 | #endif /* __XEN_PAGE_H */ |