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-rw-r--r--include/asm-x86/xen/page.h165
1 files changed, 0 insertions, 165 deletions
diff --git a/include/asm-x86/xen/page.h b/include/asm-x86/xen/page.h
deleted file mode 100644
index d5eada0a48d..00000000000
--- a/include/asm-x86/xen/page.h
+++ /dev/null
@@ -1,165 +0,0 @@
1#ifndef ASM_X86__XEN__PAGE_H
2#define ASM_X86__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 */
12typedef struct xmaddr {
13 phys_addr_t maddr;
14} xmaddr_t;
15
16/* Xen pseudo-physical address */
17typedef 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
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
34extern unsigned long get_phys_to_machine(unsigned long pfn);
35extern void set_phys_to_machine(unsigned long pfn, unsigned long mfn);
36
37static inline unsigned long pfn_to_mfn(unsigned long pfn)
38{
39 if (xen_feature(XENFEAT_auto_translated_physmap))
40 return pfn;
41
42 return get_phys_to_machine(pfn) & ~FOREIGN_FRAME_BIT;
43}
44
45static inline int phys_to_machine_mapping_valid(unsigned long pfn)
46{
47 if (xen_feature(XENFEAT_auto_translated_physmap))
48 return 1;
49
50 return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY;
51}
52
53static 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
76static inline xmaddr_t phys_to_machine(xpaddr_t phys)
77{
78 unsigned offset = phys.paddr & ~PAGE_MASK;
79 return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
80}
81
82static inline xpaddr_t machine_to_phys(xmaddr_t machine)
83{
84 unsigned offset = machine.maddr & ~PAGE_MASK;
85 return XPADDR(PFN_PHYS(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 */
108static 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)
114 && (get_phys_to_machine(pfn) != mfn))
115 return max_mapnr; /* force !pfn_valid() */
116 /* XXX fixme; not true with sparsemem */
117 return pfn;
118}
119
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
125static inline unsigned long pte_mfn(pte_t pte)
126{
127 return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT;
128}
129
130static 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
140static inline pteval_t pte_val_ma(pte_t pte)
141{
142 return pte.pte;
143}
144
145static inline pte_t __pte_ma(pteval_t x)
146{
147 return (pte_t) { .pte = x };
148}
149
150#define pmd_val_ma(v) ((v).pmd)
151#ifdef __PAGETABLE_PUD_FOLDED
152#define pud_val_ma(v) ((v).pgd.pgd)
153#else
154#define pud_val_ma(v) ((v).pud)
155#endif
156#define __pmd_ma(x) ((pmd_t) { (x) } )
157
158#define pgd_val_ma(x) ((x).pgd)
159
160
161xmaddr_t arbitrary_virt_to_machine(void *address);
162void make_lowmem_page_readonly(void *vaddr);
163void make_lowmem_page_readwrite(void *vaddr);
164
165#endif /* ASM_X86__XEN__PAGE_H */