projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1965aae3 PA |
1 | #ifndef _ASM_X86_PVCLOCK_H |
| 2 | #define _ASM_X86_PVCLOCK_H | |
| 7af192c9 GH |
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); | |
| 424c32f1 | 9 | void pvclock_set_flags(u8 flags); |
| 3807f345 | 10 | unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src); |
| 7af192c9 GH |
11 | void pvclock_read_wallclock(struct pvclock_wall_clock *wall, |
| 12 | struct pvclock_vcpu_time_info *vcpu, | |
| 13 | struct timespec *ts); | |
| 14 | ||
| 347bb444 ZA |
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 | ||
| 1965aae3 | 53 | #endif /* _ASM_X86_PVCLOCK_H */ |