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05e4d316 PA |
1 | #ifndef _ASM_X86_XEN_PAGE_H |
2 | #define _ASM_X86_XEN_PAGE_H | |
20e71f2e | 3 | |
ecbf29cd JF |
4 | #include <linux/kernel.h> |
5 | #include <linux/types.h> | |
6 | #include <linux/spinlock.h> | |
20e71f2e IY |
7 | #include <linux/pfn.h> |
8 | ||
9 | #include <asm/uaccess.h> | |
ecbf29cd | 10 | #include <asm/page.h> |
20e71f2e IY |
11 | #include <asm/pgtable.h> |
12 | ||
ecbf29cd | 13 | #include <xen/interface/xen.h> |
20e71f2e IY |
14 | #include <xen/features.h> |
15 | ||
16 | /* Xen machine address */ | |
17 | typedef struct xmaddr { | |
18 | phys_addr_t maddr; | |
19 | } xmaddr_t; | |
20 | ||
21 | /* Xen pseudo-physical address */ | |
22 | typedef struct xpaddr { | |
23 | phys_addr_t paddr; | |
24 | } xpaddr_t; | |
25 | ||
26 | #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) | |
27 | #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) | |
28 | ||
29 | /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ | |
30 | #define INVALID_P2M_ENTRY (~0UL) | |
31 | #define FOREIGN_FRAME_BIT (1UL<<31) | |
32 | #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) | |
33 | ||
8006ec3e JF |
34 | /* Maximum amount of memory we can handle in a domain in pages */ |
35 | #define MAX_DOMAIN_PAGES \ | |
36 | ((unsigned long)((u64)CONFIG_XEN_MAX_DOMAIN_MEMORY * 1024 * 1024 * 1024 / PAGE_SIZE)) | |
37 | ||
38 | ||
d451bb7a | 39 | extern unsigned long get_phys_to_machine(unsigned long pfn); |
c3798062 | 40 | extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
20e71f2e IY |
41 | |
42 | static inline unsigned long pfn_to_mfn(unsigned long pfn) | |
43 | { | |
cfd8951e JF |
44 | unsigned long mfn; |
45 | ||
20e71f2e IY |
46 | if (xen_feature(XENFEAT_auto_translated_physmap)) |
47 | return pfn; | |
48 | ||
cfd8951e JF |
49 | mfn = get_phys_to_machine(pfn); |
50 | ||
51 | if (mfn != INVALID_P2M_ENTRY) | |
52 | mfn &= ~FOREIGN_FRAME_BIT; | |
53 | ||
54 | return mfn; | |
20e71f2e IY |
55 | } |
56 | ||
57 | static inline int phys_to_machine_mapping_valid(unsigned long pfn) | |
58 | { | |
59 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
60 | return 1; | |
61 | ||
d451bb7a | 62 | return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY; |
20e71f2e IY |
63 | } |
64 | ||
65 | static inline unsigned long mfn_to_pfn(unsigned long mfn) | |
66 | { | |
67 | unsigned long pfn; | |
68 | ||
69 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
70 | return mfn; | |
71 | ||
72 | #if 0 | |
73 | if (unlikely((mfn >> machine_to_phys_order) != 0)) | |
74 | return max_mapnr; | |
75 | #endif | |
76 | ||
77 | pfn = 0; | |
78 | /* | |
79 | * The array access can fail (e.g., device space beyond end of RAM). | |
80 | * In such cases it doesn't matter what we return (we return garbage), | |
81 | * but we must handle the fault without crashing! | |
82 | */ | |
83 | __get_user(pfn, &machine_to_phys_mapping[mfn]); | |
84 | ||
85 | return pfn; | |
86 | } | |
87 | ||
88 | static inline xmaddr_t phys_to_machine(xpaddr_t phys) | |
89 | { | |
90 | unsigned offset = phys.paddr & ~PAGE_MASK; | |
947d0496 | 91 | return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); |
20e71f2e IY |
92 | } |
93 | ||
94 | static inline xpaddr_t machine_to_phys(xmaddr_t machine) | |
95 | { | |
96 | unsigned offset = machine.maddr & ~PAGE_MASK; | |
947d0496 | 97 | return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); |
20e71f2e IY |
98 | } |
99 | ||
100 | /* | |
101 | * We detect special mappings in one of two ways: | |
102 | * 1. If the MFN is an I/O page then Xen will set the m2p entry | |
103 | * to be outside our maximum possible pseudophys range. | |
104 | * 2. If the MFN belongs to a different domain then we will certainly | |
105 | * not have MFN in our p2m table. Conversely, if the page is ours, | |
106 | * then we'll have p2m(m2p(MFN))==MFN. | |
107 | * If we detect a special mapping then it doesn't have a 'struct page'. | |
108 | * We force !pfn_valid() by returning an out-of-range pointer. | |
109 | * | |
110 | * NB. These checks require that, for any MFN that is not in our reservation, | |
111 | * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | |
112 | * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | |
113 | * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | |
114 | * | |
115 | * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | |
116 | * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | |
117 | * require. In all the cases we care about, the FOREIGN_FRAME bit is | |
118 | * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | |
119 | */ | |
120 | static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | |
121 | { | |
20e71f2e | 122 | unsigned long pfn = mfn_to_pfn(mfn); |
c0011dbf JF |
123 | if (get_phys_to_machine(pfn) != mfn) |
124 | return -1; /* force !pfn_valid() */ | |
20e71f2e IY |
125 | return pfn; |
126 | } | |
127 | ||
20e71f2e IY |
128 | /* VIRT <-> MACHINE conversion */ |
129 | #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | |
b40bf53e AN |
130 | #define virt_to_pfn(v) (PFN_DOWN(__pa(v))) |
131 | #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) | |
20e71f2e IY |
132 | #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) |
133 | ||
134 | static inline unsigned long pte_mfn(pte_t pte) | |
135 | { | |
59438c9f | 136 | return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT; |
20e71f2e IY |
137 | } |
138 | ||
139 | static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
140 | { | |
141 | pte_t pte; | |
142 | ||
143 | pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | | |
b534816b | 144 | massage_pgprot(pgprot); |
20e71f2e IY |
145 | |
146 | return pte; | |
147 | } | |
148 | ||
149 | static inline pteval_t pte_val_ma(pte_t pte) | |
150 | { | |
151 | return pte.pte; | |
152 | } | |
153 | ||
154 | static inline pte_t __pte_ma(pteval_t x) | |
155 | { | |
156 | return (pte_t) { .pte = x }; | |
157 | } | |
158 | ||
20e71f2e | 159 | #define pmd_val_ma(v) ((v).pmd) |
f6e58732 | 160 | #ifdef __PAGETABLE_PUD_FOLDED |
20e71f2e | 161 | #define pud_val_ma(v) ((v).pgd.pgd) |
f6e58732 JF |
162 | #else |
163 | #define pud_val_ma(v) ((v).pud) | |
164 | #endif | |
20e71f2e | 165 | #define __pmd_ma(x) ((pmd_t) { (x) } ) |
20e71f2e IY |
166 | |
167 | #define pgd_val_ma(x) ((x).pgd) | |
168 | ||
eba3ff8b | 169 | void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid); |
20e71f2e | 170 | |
ce803e70 | 171 | xmaddr_t arbitrary_virt_to_machine(void *address); |
9976b39b | 172 | unsigned long arbitrary_virt_to_mfn(void *vaddr); |
20e71f2e IY |
173 | void make_lowmem_page_readonly(void *vaddr); |
174 | void make_lowmem_page_readwrite(void *vaddr); | |
175 | ||
05e4d316 | 176 | #endif /* _ASM_X86_XEN_PAGE_H */ |