Linux Kernel  3.7.1
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page.h
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1 #ifndef _ASM_ARM_XEN_PAGE_H
2 #define _ASM_ARM_XEN_PAGE_H
3 
4 #include <asm/page.h>
5 #include <asm/pgtable.h>
6 
7 #include <linux/pfn.h>
8 #include <linux/types.h>
9 
11 
12 #define pfn_to_mfn(pfn) (pfn)
13 #define phys_to_machine_mapping_valid(pfn) (1)
14 #define mfn_to_pfn(mfn) (mfn)
15 #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
16 
17 #define pte_mfn pte_pfn
18 #define mfn_pte pfn_pte
19 
20 /* Xen machine address */
21 typedef struct xmaddr {
23 } xmaddr_t;
24 
25 /* Xen pseudo-physical address */
26 typedef struct xpaddr {
28 } xpaddr_t;
29 
30 #define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
31 #define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
32 
33 #define INVALID_P2M_ENTRY (~0UL)
34 
35 static inline xmaddr_t phys_to_machine(xpaddr_t phys)
36 {
37  unsigned offset = phys.paddr & ~PAGE_MASK;
38  return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
39 }
40 
41 static inline xpaddr_t machine_to_phys(xmaddr_t machine)
42 {
43  unsigned offset = machine.maddr & ~PAGE_MASK;
44  return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
45 }
46 /* VIRT <-> MACHINE conversion */
47 #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
48 #define virt_to_pfn(v) (PFN_DOWN(__pa(v)))
49 #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
50 #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
51 
52 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
53 {
54  /* TODO: assuming it is mapped in the kernel 1:1 */
55  return virt_to_machine(vaddr);
56 }
57 
58 /* TODO: this shouldn't be here but it is because the frontend drivers
59  * are using it (its rolled in headers) even though we won't hit the code path.
60  * So for right now just punt with this.
61  */
62 static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
63 {
64  BUG();
65  return NULL;
66 }
67 
68 static inline int m2p_add_override(unsigned long mfn, struct page *page,
69  struct gnttab_map_grant_ref *kmap_op)
70 {
71  return 0;
72 }
73 
74 static inline int m2p_remove_override(struct page *page, bool clear_pte)
75 {
76  return 0;
77 }
78 
79 static inline bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
80 {
81  BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
82  return true;
83 }
84 
85 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
86 {
87  return __set_phys_to_machine(pfn, mfn);
88 }
89 #endif /* _ASM_ARM_XEN_PAGE_H */