Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[sfrench/cifs-2.6.git] / arch / arm / include / asm / xen / interface.h
1 /******************************************************************************
2  * Guest OS interface to ARM Xen.
3  *
4  * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, 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 typedef uint64_t xen_pfn_t;
34 typedef uint64_t xen_ulong_t;
35 /* Guest handles for primitive C types. */
36 __DEFINE_GUEST_HANDLE(uchar, unsigned char);
37 __DEFINE_GUEST_HANDLE(uint,  unsigned int);
38 __DEFINE_GUEST_HANDLE(ulong, unsigned long);
39 DEFINE_GUEST_HANDLE(char);
40 DEFINE_GUEST_HANDLE(int);
41 DEFINE_GUEST_HANDLE(long);
42 DEFINE_GUEST_HANDLE(void);
43 DEFINE_GUEST_HANDLE(uint64_t);
44 DEFINE_GUEST_HANDLE(uint32_t);
45 DEFINE_GUEST_HANDLE(xen_pfn_t);
46
47 /* Maximum number of virtual CPUs in multi-processor guests. */
48 #define MAX_VIRT_CPUS 1
49
50 struct arch_vcpu_info { };
51 struct arch_shared_info { };
52
53 /* TODO: Move pvclock definitions some place arch independent */
54 struct pvclock_vcpu_time_info {
55         u32   version;
56         u32   pad0;
57         u64   tsc_timestamp;
58         u64   system_time;
59         u32   tsc_to_system_mul;
60         s8    tsc_shift;
61         u8    flags;
62         u8    pad[2];
63 } __attribute__((__packed__)); /* 32 bytes */
64
65 /* It is OK to have a 12 bytes struct with no padding because it is packed */
66 struct pvclock_wall_clock {
67         u32   version;
68         u32   sec;
69         u32   nsec;
70 } __attribute__((__packed__));
71 #endif
72
73 #endif /* _ASM_ARM_XEN_INTERFACE_H */