1 #ifndef _ASM_X86_PVCLOCK_H 2 #define _ASM_X86_PVCLOCK_H 3 4 #include <linux/clocksource.h> 5 #include <asm/pvclock-abi.h> 6 7 /* some helper functions for xen and kvm pv clock sources */ 8 cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src); 9 void pvclock_set_flags(u8 flags); 10 unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src); 11 void pvclock_read_wallclock(struct pvclock_wall_clock *wall, 12 struct pvclock_vcpu_time_info *vcpu, 13 struct timespec *ts); 14 15 /* 16 * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction, 17 * yielding a 64-bit result. 18 */ 19 static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift) 20 { 21 u64 product; 22 #ifdef __i386__ 23 u32 tmp1, tmp2; 24 #endif 25 26 if (shift < 0) 27 delta >>= -shift; 28 else 29 delta <<= shift; 30 31 #ifdef __i386__ 32 __asm__ ( 33 "mul %5 ; " 34 "mov %4,%%eax ; " 35 "mov %%edx,%4 ; " 36 "mul %5 ; " 37 "xor %5,%5 ; " 38 "add %4,%%eax ; " 39 "adc %5,%%edx ; " 40 : "=A" (product), "=r" (tmp1), "=r" (tmp2) 41 : "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) ); 42 #elif defined(__x86_64__) 43 __asm__ ( 44 "mul %%rdx ; shrd $32,%%rdx,%%rax" 45 : "=a" (product) : "0" (delta), "d" ((u64)mul_frac) ); 46 #else 47 #error implement me! 48 #endif 49 50 return product; 51 } 52 53 #endif /* _ASM_X86_PVCLOCK_H */ 54