LXR linux/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#define __HYPERVISOR_platform_op_raw __HYPERVISOR_platform_op
  31
  32#ifndef __ASSEMBLY__
  33/* Explicitly size integers that represent pfns in the interface with
  34 * Xen so that we can have one ABI that works for 32 and 64 bit guests.
  35 * Note that this means that the xen_pfn_t type may be capable of
  36 * representing pfn's which the guest cannot represent in its own pfn
  37 * type. However since pfn space is controlled by the guest this is
  38 * fine since it simply wouldn't be able to create any sure pfns in
  39 * the first place.
  40 */
  41typedef uint64_t xen_pfn_t;
  42#define PRI_xen_pfn "llx"
  43typedef uint64_t xen_ulong_t;
  44#define PRI_xen_ulong "llx"
  45typedef int64_t xen_long_t;
  46#define PRI_xen_long "llx"
  47/* Guest handles for primitive C types. */
  48__DEFINE_GUEST_HANDLE(uchar, unsigned char);
  49__DEFINE_GUEST_HANDLE(uint,  unsigned int);
  50DEFINE_GUEST_HANDLE(char);
  51DEFINE_GUEST_HANDLE(int);
  52DEFINE_GUEST_HANDLE(void);
  53DEFINE_GUEST_HANDLE(uint64_t);
  54DEFINE_GUEST_HANDLE(uint32_t);
  55DEFINE_GUEST_HANDLE(xen_pfn_t);
  56DEFINE_GUEST_HANDLE(xen_ulong_t);
  57
  58/* Maximum number of virtual CPUs in multi-processor guests. */
  59#define MAX_VIRT_CPUS 1
  60
  61struct arch_vcpu_info { };
  62struct arch_shared_info { };
  63
  64/* TODO: Move pvclock definitions some place arch independent */
  65struct pvclock_vcpu_time_info {
  66        u32   version;
  67        u32   pad0;
  68        u64   tsc_timestamp;
  69        u64   system_time;
  70        u32   tsc_to_system_mul;
  71        s8    tsc_shift;
  72        u8    flags;
  73        u8    pad[2];
  74} __attribute__((__packed__)); /* 32 bytes */
  75
  76/* It is OK to have a 12 bytes struct with no padding because it is packed */
  77struct pvclock_wall_clock {
  78        u32   version;
  79        u32   sec;
  80        u32   nsec;
  81        u32   sec_hi;
  82} __attribute__((__packed__));
  83#endif
  84
  85#endif /* _ASM_ARM_XEN_INTERFACE_H */
  86