ia64/xen: add a necessary header file to compile include/xen/interface/xen.h

/*

 * same structure to x86's

 * Hopefully asm-x86/pvclock-abi.h would be moved to somewhere more generic.

 * For now, define same duplicated definitions.

 */

#ifndef _ASM_IA64__PVCLOCK_ABI_H

#define _ASM_IA64__PVCLOCK_ABI_H

#ifndef __ASSEMBLY__

/*

 * These structs MUST NOT be changed.

 * They are the ABI between hypervisor and guest OS.

 * Both Xen and KVM are using this.

 *

 * pvclock_vcpu_time_info holds the system time and the tsc timestamp

 * of the last update. So the guest can use the tsc delta to get a

 * more precise system time.  There is one per virtual cpu.

 *

 * pvclock_wall_clock references the point in time when the system

 * time was zero (usually boot time), thus the guest calculates the

 * current wall clock by adding the system time.

 *

 * Protocol for the "version" fields is: hypervisor raises it (making

 * it uneven) before it starts updating the fields and raises it again

 * (making it even) when it is done.  Thus the guest can make sure the

 * time values it got are consistent by checking the version before

 * and after reading them.

 */

struct pvclock_vcpu_time_info {

	u32   version;

	u32   pad0;

	u64   tsc_timestamp;

	u64   system_time;

	u32   tsc_to_system_mul;

	s8    tsc_shift;

	u8    pad[3];

} __attribute__((__packed__)); /* 32 bytes */

struct pvclock_wall_clock {

	u32   version;

	u32   sec;

	u32   nsec;

} __attribute__((__packed__));

#endif /* __ASSEMBLY__ */

#endif /* _ASM_IA64__PVCLOCK_ABI_H */