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- #ifndef _ASM_X86_PVCLOCK_H
- #define _ASM_X86_PVCLOCK_H
- #include <linux/clocksource.h>
- #include <asm/pvclock-abi.h>
- /* some helper functions for xen and kvm pv clock sources */
- cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src);
- void pvclock_set_flags(u8 flags);
- unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src);
- void pvclock_read_wallclock(struct pvclock_wall_clock *wall,
- struct pvclock_vcpu_time_info *vcpu,
- struct timespec *ts);
- void pvclock_resume(void);
- /*
- * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction,
- * yielding a 64-bit result.
- */
- static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift)
- {
- u64 product;
- #ifdef __i386__
- u32 tmp1, tmp2;
- #endif
- if (shift < 0)
- delta >>= -shift;
- else
- delta <<= shift;
- #ifdef __i386__
- __asm__ (
- "mul %5 ; "
- "mov %4,%%eax ; "
- "mov %%edx,%4 ; "
- "mul %5 ; "
- "xor %5,%5 ; "
- "add %4,%%eax ; "
- "adc %5,%%edx ; "
- : "=A" (product), "=r" (tmp1), "=r" (tmp2)
- : "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) );
- #elif defined(__x86_64__)
- __asm__ (
- "mul %%rdx ; shrd $32,%%rdx,%%rax"
- : "=a" (product) : "0" (delta), "d" ((u64)mul_frac) );
- #else
- #error implement me!
- #endif
- return product;
- }
- #endif /* _ASM_X86_PVCLOCK_H */
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