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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6588 | serge | 1 | #ifndef _ASM_X86_PVCLOCK_H |
| 2 | #define _ASM_X86_PVCLOCK_H |
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| 3 | |||
| 4 | #include |
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| 5 | #include |
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| 6 | |||
| 7 | /* some helper functions for xen and kvm pv clock sources */ |
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| 8 | cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src); |
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| 9 | u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src); |
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| 10 | void pvclock_set_flags(u8 flags); |
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| 11 | unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src); |
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| 12 | void pvclock_read_wallclock(struct pvclock_wall_clock *wall, |
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| 13 | struct pvclock_vcpu_time_info *vcpu, |
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| 14 | struct timespec *ts); |
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| 15 | void pvclock_resume(void); |
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| 16 | |||
| 17 | void pvclock_touch_watchdogs(void); |
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| 18 | |||
| 19 | /* |
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| 20 | * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction, |
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| 21 | * yielding a 64-bit result. |
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| 22 | */ |
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| 23 | static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift) |
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| 24 | { |
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| 25 | u64 product; |
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| 26 | #ifdef __i386__ |
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| 27 | u32 tmp1, tmp2; |
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| 28 | #else |
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| 29 | ulong tmp; |
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| 30 | #endif |
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| 31 | |||
| 32 | if (shift < 0) |
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| 33 | delta >>= -shift; |
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| 34 | else |
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| 35 | delta <<= shift; |
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| 36 | |||
| 37 | #ifdef __i386__ |
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| 38 | __asm__ ( |
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| 39 | "mul %5 ; " |
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| 40 | "mov %4,%%eax ; " |
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| 41 | "mov %%edx,%4 ; " |
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| 42 | "mul %5 ; " |
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| 43 | "xor %5,%5 ; " |
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| 44 | "add %4,%%eax ; " |
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| 45 | "adc %5,%%edx ; " |
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| 46 | : "=A" (product), "=r" (tmp1), "=r" (tmp2) |
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| 47 | : "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) ); |
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| 48 | #elif defined(__x86_64__) |
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| 49 | __asm__ ( |
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| 50 | "mulq %[mul_frac] ; shrd $32, %[hi], %[lo]" |
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| 51 | : [lo]"=a"(product), |
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| 52 | [hi]"=d"(tmp) |
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| 53 | : "0"(delta), |
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| 54 | [mul_frac]"rm"((u64)mul_frac)); |
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| 55 | #else |
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| 56 | #error implement me! |
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| 57 | #endif |
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| 58 | |||
| 59 | return product; |
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| 60 | } |
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| 61 | |||
| 62 | |||
| 63 | struct pvclock_vsyscall_time_info { |
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| 64 | struct pvclock_vcpu_time_info pvti; |
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| 65 | } __attribute__((__aligned__(SMP_CACHE_BYTES))); |
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| 66 | |||
| 67 | #define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info) |
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| 68 | |||
| 69 | #endif /* _ASM_X86_PVCLOCK_H */ |