aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ia64
diff options
context:
space:
mode:
authorIsaku Yamahata <yamahata@valinux.co.jp>2008-10-16 22:17:50 -0400
committerTony Luck <tony.luck@intel.com>2008-10-17 12:57:28 -0400
commit25c7bfaef201ab8cef400ea96e27803e1d32697a (patch)
treef3f2d626f868de472b51dde9a7e6bce4af9d4cc3 /arch/ia64
parentb31c09bd82731600a72c83894e7c6a53b36b6c83 (diff)
ia64/xen: add a necessary header file to compile include/xen/interface/xen.h
Create include/asm-ia64/pvclock-abi.h to compile which contains the same definitions of include/asm-x86/pvclock-abi.h because ia64/xen uses same structure. Hopefully include/asm-x86/pvclock-abi.h would be moved to somewhere more generic. Another approach is to include include/asm-x86/pvclock-abi.h from include/asm-ia64/pvclock-abi.h. But this would break if/when x86 header files are moved under arch/x86. So for now, same definitions are duplicated as suggested by Tony. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/include/asm/pvclock-abi.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/ia64/include/asm/pvclock-abi.h b/arch/ia64/include/asm/pvclock-abi.h
new file mode 100644
index 000000000000..44ef9ef8f5b3
--- /dev/null
+++ b/arch/ia64/include/asm/pvclock-abi.h
@@ -0,0 +1,48 @@
1/*
2 * same structure to x86's
3 * Hopefully asm-x86/pvclock-abi.h would be moved to somewhere more generic.
4 * For now, define same duplicated definitions.
5 */
6
7#ifndef _ASM_IA64__PVCLOCK_ABI_H
8#define _ASM_IA64__PVCLOCK_ABI_H
9#ifndef __ASSEMBLY__
10
11/*
12 * These structs MUST NOT be changed.
13 * They are the ABI between hypervisor and guest OS.
14 * Both Xen and KVM are using this.
15 *
16 * pvclock_vcpu_time_info holds the system time and the tsc timestamp
17 * of the last update. So the guest can use the tsc delta to get a
18 * more precise system time. There is one per virtual cpu.
19 *
20 * pvclock_wall_clock references the point in time when the system
21 * time was zero (usually boot time), thus the guest calculates the
22 * current wall clock by adding the system time.
23 *
24 * Protocol for the "version" fields is: hypervisor raises it (making
25 * it uneven) before it starts updating the fields and raises it again
26 * (making it even) when it is done. Thus the guest can make sure the
27 * time values it got are consistent by checking the version before
28 * and after reading them.
29 */
30
31struct pvclock_vcpu_time_info {
32 u32 version;
33 u32 pad0;
34 u64 tsc_timestamp;
35 u64 system_time;
36 u32 tsc_to_system_mul;
37 s8 tsc_shift;
38 u8 pad[3];
39} __attribute__((__packed__)); /* 32 bytes */
40
41struct pvclock_wall_clock {
42 u32 version;
43 u32 sec;
44 u32 nsec;
45} __attribute__((__packed__));
46
47#endif /* __ASSEMBLY__ */
48#endif /* _ASM_IA64__PVCLOCK_ABI_H */