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#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 */
  39typedef uint64_t xen_pfn_t;
  40#define PRI_xen_pfn "llx"
  41typedef 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);
  46DEFINE_GUEST_HANDLE(char);
  47DEFINE_GUEST_HANDLE(int);
  48DEFINE_GUEST_HANDLE(void);
  49DEFINE_GUEST_HANDLE(uint64_t);
  50DEFINE_GUEST_HANDLE(uint32_t);
  51DEFINE_GUEST_HANDLE(xen_pfn_t);
  52DEFINE_GUEST_HANDLE(xen_ulong_t);
  53
  54/* Maximum number of virtual CPUs in multi-processor guests. */
  55#define MAX_VIRT_CPUS 1
  56
  57struct arch_vcpu_info { };
  58struct arch_shared_info { };
  59
  60/* TODO: Move pvclock definitions some place arch independent */
  61struct 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 */
  73struct 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 */
  81