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 void pvclock_resume(void); 15 16 /* 17 * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction, 18 * yielding a 64-bit result. 19 */ 20 static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift) 21 { 22 u64 product; 23 #ifdef __i386__ 24 u32 tmp1, tmp2; 25 #endif 26 27 if (shift < 0) 28 delta >>= -shift; 29 else 30 delta <<= shift; 31 32 #ifdef __i386__ 33 __asm__ ( 34 "mul %5 ; " 35 "mov %4,%%eax ; " 36 "mov %%edx,%4 ; " 37 "mul %5 ; " 38 "xor %5,%5 ; " 39 "add %4,%%eax ; " 40 "adc %5,%%edx ; " 41 : "=A" (product), "=r" (tmp1), "=r" (tmp2) 42 : "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) ); 43 #elif defined(__x86_64__) 44 __asm__ ( 45 "mul %%rdx ; shrd $32,%%rdx,%%rax" 46 : "=a" (product) : "0" (delta), "d" ((u64)mul_frac) ); 47 #else 48 #error implement me! 49 #endif 50 51 return product; 52 } 53 54 #endif /* _ASM_X86_PVCLOCK_H */ 55