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x86: pvclock: generic pvclock vsyscall initialization

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Originally from Jeremy Fitzhardinge.

Introduce generic, non hypervisor specific, pvclock initialization
routines.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti
2012-11-27 23:28:55 -02:00
parent 582b336ec2
commit 71056ae22d
4 changed files with 91 additions and 0 deletions
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12
arch/x86/include/asm/pvclock.h
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@@ -91,4 +91,16 @@ unsigned __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src,
return version;
}
struct pvclock_vsyscall_time_info {
struct pvclock_vcpu_time_info pvti;
u32 migrate_count;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));
#define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info)
#define PVCLOCK_VSYSCALL_NR_PAGES (((NR_CPUS-1)/(PAGE_SIZE/PVTI_SIZE))+1)
int __init pvclock_init_vsyscall(struct pvclock_vsyscall_time_info *i,
int size);
struct pvclock_vcpu_time_info *pvclock_get_vsyscall_time_info(int cpu);
#endif /* _ASM_X86_PVCLOCK_H */