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20e71f2e IY |
1 | #ifndef __XEN_PAGE_H |
2 | #define __XEN_PAGE_H | |
3 | ||
4 | #include <linux/pfn.h> | |
5 | ||
6 | #include <asm/uaccess.h> | |
7 | #include <asm/pgtable.h> | |
8 | ||
9 | #include <xen/features.h> | |
10 | ||
11 | /* Xen machine address */ | |
12 | typedef struct xmaddr { | |
13 | phys_addr_t maddr; | |
14 | } xmaddr_t; | |
15 | ||
16 | /* Xen pseudo-physical address */ | |
17 | typedef struct xpaddr { | |
18 | phys_addr_t paddr; | |
19 | } xpaddr_t; | |
20 | ||
21 | #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) | |
22 | #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) | |
23 | ||
24 | /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ | |
25 | #define INVALID_P2M_ENTRY (~0UL) | |
26 | #define FOREIGN_FRAME_BIT (1UL<<31) | |
27 | #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) | |
28 | ||
8006ec3e JF |
29 | /* Maximum amount of memory we can handle in a domain in pages */ |
30 | #define MAX_DOMAIN_PAGES \ | |
31 | ((unsigned long)((u64)CONFIG_XEN_MAX_DOMAIN_MEMORY * 1024 * 1024 * 1024 / PAGE_SIZE)) | |
32 | ||
33 | ||
d451bb7a JF |
34 | extern unsigned long get_phys_to_machine(unsigned long pfn); |
35 | extern void set_phys_to_machine(unsigned long pfn, unsigned long mfn); | |
20e71f2e IY |
36 | |
37 | static inline unsigned long pfn_to_mfn(unsigned long pfn) | |
38 | { | |
39 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
40 | return pfn; | |
41 | ||
d451bb7a | 42 | return get_phys_to_machine(pfn) & ~FOREIGN_FRAME_BIT; |
20e71f2e IY |
43 | } |
44 | ||
45 | static inline int phys_to_machine_mapping_valid(unsigned long pfn) | |
46 | { | |
47 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
48 | return 1; | |
49 | ||
d451bb7a | 50 | return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY; |
20e71f2e IY |
51 | } |
52 | ||
53 | static inline unsigned long mfn_to_pfn(unsigned long mfn) | |
54 | { | |
55 | unsigned long pfn; | |
56 | ||
57 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
58 | return mfn; | |
59 | ||
60 | #if 0 | |
61 | if (unlikely((mfn >> machine_to_phys_order) != 0)) | |
62 | return max_mapnr; | |
63 | #endif | |
64 | ||
65 | pfn = 0; | |
66 | /* | |
67 | * The array access can fail (e.g., device space beyond end of RAM). | |
68 | * In such cases it doesn't matter what we return (we return garbage), | |
69 | * but we must handle the fault without crashing! | |
70 | */ | |
71 | __get_user(pfn, &machine_to_phys_mapping[mfn]); | |
72 | ||
73 | return pfn; | |
74 | } | |
75 | ||
76 | static inline xmaddr_t phys_to_machine(xpaddr_t phys) | |
77 | { | |
78 | unsigned offset = phys.paddr & ~PAGE_MASK; | |
79 | return XMADDR(PFN_PHYS((u64)pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); | |
80 | } | |
81 | ||
82 | static inline xpaddr_t machine_to_phys(xmaddr_t machine) | |
83 | { | |
84 | unsigned offset = machine.maddr & ~PAGE_MASK; | |
85 | return XPADDR(PFN_PHYS((u64)mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); | |
86 | } | |
87 | ||
88 | /* | |
89 | * We detect special mappings in one of two ways: | |
90 | * 1. If the MFN is an I/O page then Xen will set the m2p entry | |
91 | * to be outside our maximum possible pseudophys range. | |
92 | * 2. If the MFN belongs to a different domain then we will certainly | |
93 | * not have MFN in our p2m table. Conversely, if the page is ours, | |
94 | * then we'll have p2m(m2p(MFN))==MFN. | |
95 | * If we detect a special mapping then it doesn't have a 'struct page'. | |
96 | * We force !pfn_valid() by returning an out-of-range pointer. | |
97 | * | |
98 | * NB. These checks require that, for any MFN that is not in our reservation, | |
99 | * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | |
100 | * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | |
101 | * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | |
102 | * | |
103 | * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | |
104 | * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | |
105 | * require. In all the cases we care about, the FOREIGN_FRAME bit is | |
106 | * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | |
107 | */ | |
108 | static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | |
109 | { | |
110 | extern unsigned long max_mapnr; | |
111 | unsigned long pfn = mfn_to_pfn(mfn); | |
112 | if ((pfn < max_mapnr) | |
113 | && !xen_feature(XENFEAT_auto_translated_physmap) | |
d451bb7a | 114 | && (get_phys_to_machine(pfn) != mfn)) |
20e71f2e | 115 | return max_mapnr; /* force !pfn_valid() */ |
d451bb7a | 116 | /* XXX fixme; not true with sparsemem */ |
20e71f2e IY |
117 | return pfn; |
118 | } | |
119 | ||
20e71f2e IY |
120 | /* VIRT <-> MACHINE conversion */ |
121 | #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | |
122 | #define virt_to_mfn(v) (pfn_to_mfn(PFN_DOWN(__pa(v)))) | |
123 | #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) | |
124 | ||
125 | static inline unsigned long pte_mfn(pte_t pte) | |
126 | { | |
cbb3077c | 127 | return (pte.pte & PTE_MASK) >> PAGE_SHIFT; |
20e71f2e IY |
128 | } |
129 | ||
130 | static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
131 | { | |
132 | pte_t pte; | |
133 | ||
134 | pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | | |
135 | (pgprot_val(pgprot) & __supported_pte_mask); | |
136 | ||
137 | return pte; | |
138 | } | |
139 | ||
140 | static inline pteval_t pte_val_ma(pte_t pte) | |
141 | { | |
142 | return pte.pte; | |
143 | } | |
144 | ||
145 | static inline pte_t __pte_ma(pteval_t x) | |
146 | { | |
147 | return (pte_t) { .pte = x }; | |
148 | } | |
149 | ||
20e71f2e IY |
150 | #define pmd_val_ma(v) ((v).pmd) |
151 | #define pud_val_ma(v) ((v).pgd.pgd) | |
152 | #define __pmd_ma(x) ((pmd_t) { (x) } ) | |
20e71f2e IY |
153 | |
154 | #define pgd_val_ma(x) ((x).pgd) | |
155 | ||
156 | ||
157 | xmaddr_t arbitrary_virt_to_machine(unsigned long address); | |
158 | void make_lowmem_page_readonly(void *vaddr); | |
159 | void make_lowmem_page_readwrite(void *vaddr); | |
160 | ||
161 | #endif /* __XEN_PAGE_H */ |