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interface.h
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1 /******************************************************************************
2  * Guest OS interface to ARM Xen.
3  *
4  * Stefano Stabellini <[email protected]>, Citrix, 2012
5  */
6 
7 #ifndef _ASM_ARM_XEN_INTERFACE_H
8 #define _ASM_ARM_XEN_INTERFACE_H
9 
10 #include <linux/types.h>
11 
12 #define uint64_aligned_t uint64_t __attribute__((aligned(8)))
13 
14 #define __DEFINE_GUEST_HANDLE(name, type) \
15  typedef struct { union { type *p; uint64_aligned_t q; }; } \
16  __guest_handle_ ## name
17 
18 #define DEFINE_GUEST_HANDLE_STRUCT(name) \
19  __DEFINE_GUEST_HANDLE(name, struct name)
20 #define DEFINE_GUEST_HANDLE(name) __DEFINE_GUEST_HANDLE(name, name)
21 #define GUEST_HANDLE(name) __guest_handle_ ## name
22 
23 #define set_xen_guest_handle(hnd, val) \
24  do { \
25  if (sizeof(hnd) == 8) \
26  *(uint64_t *)&(hnd) = 0; \
27  (hnd).p = val; \
28  } while (0)
29 
30 #ifndef __ASSEMBLY__
31 /* Explicitly size integers that represent pfns in the interface with
32  * Xen so that we can have one ABI that works for 32 and 64 bit guests.
33  * Note that this means that the xen_pfn_t type may be capable of
34  * representing pfn's which the guest cannot represent in its own pfn
35  * type. However since pfn space is controlled by the guest this is
36  * fine since it simply wouldn't be able to create any sure pfns in
37  * the first place.
38  */
40 #define PRI_xen_pfn "llx"
42 #define PRI_xen_ulong "llx"
43 /* Guest handles for primitive C types. */
44 __DEFINE_GUEST_HANDLE(uchar, unsigned char);
45 __DEFINE_GUEST_HANDLE(uint, unsigned int);
52 
53 /* Maximum number of virtual CPUs in multi-processor guests. */
54 #define MAX_VIRT_CPUS 1
55 
56 struct arch_vcpu_info { };
57 struct arch_shared_info { };
58 
59 /* TODO: Move pvclock definitions some place arch independent */
68  u8 pad[2];
69 } __attribute__((__packed__)); /* 32 bytes */
70 
71 /* It is OK to have a 12 bytes struct with no padding because it is packed */
76 } __attribute__((__packed__));
77 #endif
78 
79 #endif /* _ASM_ARM_XEN_INTERFACE_H */