0,0 → 1,74 |
#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); |
u8 pvclock_read_flags(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); |
|
void pvclock_touch_watchdogs(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; |
#else |
ulong tmp; |
#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__ ( |
"mulq %[mul_frac] ; shrd $32, %[hi], %[lo]" |
: [lo]"=a"(product), |
[hi]"=d"(tmp) |
: "0"(delta), |
[mul_frac]"rm"((u64)mul_frac)); |
#else |
#error implement me! |
#endif |
|
return product; |
} |
|
|
struct pvclock_vsyscall_time_info { |
struct pvclock_vcpu_time_info pvti; |
} __attribute__((__aligned__(SMP_CACHE_BYTES))); |
|
#define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info) |
#define PVCLOCK_VSYSCALL_NR_PAGES (((NR_CPUS-1)/(PAGE_SIZE/PVTI_SIZE))+1) |
|
int __init pvclock_init_vsyscall(struct pvclock_vsyscall_time_info *i, |
int size); |
struct pvclock_vcpu_time_info *pvclock_get_vsyscall_time_info(int cpu); |
|
#endif /* _ASM_X86_PVCLOCK_H */ |