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  * 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  */
  39 typedef uint64_t xen_pfn_t;
  40 #define PRI_xen_pfn "llx"
  41 typedef uint64_t xen_ulong_t;
  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);
  46 DEFINE_GUEST_HANDLE(char);
  47 DEFINE_GUEST_HANDLE(int);
  48 DEFINE_GUEST_HANDLE(void);
  49 DEFINE_GUEST_HANDLE(uint64_t);
  50 DEFINE_GUEST_HANDLE(uint32_t);
  51 DEFINE_GUEST_HANDLE(xen_pfn_t);
  52 DEFINE_GUEST_HANDLE(xen_ulong_t);
  53
  54 /* Maximum number of virtual CPUs in multi-processor guests. */
  55 #define MAX_VIRT_CPUS 1
  56
  57 struct arch_vcpu_info { };
  58 struct arch_shared_info { };
  59
  60 /* TODO: Move pvclock definitions some place arch independent */
  61 struct pvclock_vcpu_time_info {
  62         u32   version;
  63         u32   pad0;
  64         u64   tsc_timestamp;
  65         u64   system_time;
  66         u32   tsc_to_system_mul;
  67         s8    tsc_shift;
  68         u8    flags;
  69         u8    pad[2];
  70 } __attribute__((__packed__)); /* 32 bytes */
  71
  72 /* It is OK to have a 12 bytes struct with no padding because it is packed */
  73 struct pvclock_wall_clock {
  74         u32   version;
  75         u32   sec;
  76         u32   nsec;
  77 } __attribute__((__packed__));
  78 #endif
  79
  80 #endif /* _ASM_ARM_XEN_INTERFACE_H */