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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 JF |
39 | extern unsigned long get_phys_to_machine(unsigned long pfn); |
40 | extern void 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 | { | |
44 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
45 | return pfn; | |
46 | ||
d451bb7a | 47 | return get_phys_to_machine(pfn) & ~FOREIGN_FRAME_BIT; |
20e71f2e IY |
48 | } |
49 | ||
50 | static inline int phys_to_machine_mapping_valid(unsigned long pfn) | |
51 | { | |
52 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
53 | return 1; | |
54 | ||
d451bb7a | 55 | return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY; |
20e71f2e IY |
56 | } |
57 | ||
58 | static inline unsigned long mfn_to_pfn(unsigned long mfn) | |
59 | { | |
60 | unsigned long pfn; | |
61 | ||
62 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
63 | return mfn; | |
64 | ||
65 | #if 0 | |
66 | if (unlikely((mfn >> machine_to_phys_order) != 0)) | |
67 | return max_mapnr; | |
68 | #endif | |
69 | ||
70 | pfn = 0; | |
71 | /* | |
72 | * The array access can fail (e.g., device space beyond end of RAM). | |
73 | * In such cases it doesn't matter what we return (we return garbage), | |
74 | * but we must handle the fault without crashing! | |
75 | */ | |
76 | __get_user(pfn, &machine_to_phys_mapping[mfn]); | |
77 | ||
78 | return pfn; | |
79 | } | |
80 | ||
81 | static inline xmaddr_t phys_to_machine(xpaddr_t phys) | |
82 | { | |
83 | unsigned offset = phys.paddr & ~PAGE_MASK; | |
947d0496 | 84 | return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); |
20e71f2e IY |
85 | } |
86 | ||
87 | static inline xpaddr_t machine_to_phys(xmaddr_t machine) | |
88 | { | |
89 | unsigned offset = machine.maddr & ~PAGE_MASK; | |
947d0496 | 90 | return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); |
20e71f2e IY |
91 | } |
92 | ||
93 | /* | |
94 | * We detect special mappings in one of two ways: | |
95 | * 1. If the MFN is an I/O page then Xen will set the m2p entry | |
96 | * to be outside our maximum possible pseudophys range. | |
97 | * 2. If the MFN belongs to a different domain then we will certainly | |
98 | * not have MFN in our p2m table. Conversely, if the page is ours, | |
99 | * then we'll have p2m(m2p(MFN))==MFN. | |
100 | * If we detect a special mapping then it doesn't have a 'struct page'. | |
101 | * We force !pfn_valid() by returning an out-of-range pointer. | |
102 | * | |
103 | * NB. These checks require that, for any MFN that is not in our reservation, | |
104 | * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | |
105 | * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | |
106 | * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | |
107 | * | |
108 | * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | |
109 | * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | |
110 | * require. In all the cases we care about, the FOREIGN_FRAME bit is | |
111 | * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | |
112 | */ | |
113 | static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | |
114 | { | |
115 | extern unsigned long max_mapnr; | |
116 | unsigned long pfn = mfn_to_pfn(mfn); | |
117 | if ((pfn < max_mapnr) | |
118 | && !xen_feature(XENFEAT_auto_translated_physmap) | |
d451bb7a | 119 | && (get_phys_to_machine(pfn) != mfn)) |
20e71f2e | 120 | return max_mapnr; /* force !pfn_valid() */ |
d451bb7a | 121 | /* XXX fixme; not true with sparsemem */ |
20e71f2e IY |
122 | return pfn; |
123 | } | |
124 | ||
20e71f2e IY |
125 | /* VIRT <-> MACHINE conversion */ |
126 | #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | |
127 | #define virt_to_mfn(v) (pfn_to_mfn(PFN_DOWN(__pa(v)))) | |
128 | #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) | |
129 | ||
130 | static inline unsigned long pte_mfn(pte_t pte) | |
131 | { | |
59438c9f | 132 | return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT; |
20e71f2e IY |
133 | } |
134 | ||
135 | static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
136 | { | |
137 | pte_t pte; | |
138 | ||
139 | pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | | |
b534816b | 140 | massage_pgprot(pgprot); |
20e71f2e IY |
141 | |
142 | return pte; | |
143 | } | |
144 | ||
145 | static inline pteval_t pte_val_ma(pte_t pte) | |
146 | { | |
147 | return pte.pte; | |
148 | } | |
149 | ||
150 | static inline pte_t __pte_ma(pteval_t x) | |
151 | { | |
152 | return (pte_t) { .pte = x }; | |
153 | } | |
154 | ||
20e71f2e | 155 | #define pmd_val_ma(v) ((v).pmd) |
f6e58732 | 156 | #ifdef __PAGETABLE_PUD_FOLDED |
20e71f2e | 157 | #define pud_val_ma(v) ((v).pgd.pgd) |
f6e58732 JF |
158 | #else |
159 | #define pud_val_ma(v) ((v).pud) | |
160 | #endif | |
20e71f2e | 161 | #define __pmd_ma(x) ((pmd_t) { (x) } ) |
20e71f2e IY |
162 | |
163 | #define pgd_val_ma(x) ((x).pgd) | |
164 | ||
165 | ||
ce803e70 | 166 | xmaddr_t arbitrary_virt_to_machine(void *address); |
20e71f2e IY |
167 | void make_lowmem_page_readonly(void *vaddr); |
168 | void make_lowmem_page_readwrite(void *vaddr); | |
169 | ||
05e4d316 | 170 | #endif /* _ASM_X86_XEN_PAGE_H */ |