[deliverable/linux.git] / arch / x86 / include / asm / pvclock.h

#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);
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);

/*
 * 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;
}

#endif /* _ASM_X86_PVCLOCK_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_PVCLOCK_H
1965aae3 PA	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);
e7a3481c	14	void pvclock_resume(void);
7af192c9	15
347bb444 ZA	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;
de2d1a52 ZA	25	#else
de2d1a52 ZA	26	ulong tmp;
347bb444 ZA	27	#endif
	28
	29	if (shift < 0)
	30	delta >>= -shift;
	31	else
	32	delta <<= shift;
	33
	34	#ifdef __i386__
	35	__asm__ (
	36	"mul %5 ; "
	37	"mov %4,%%eax ; "
	38	"mov %%edx,%4 ; "
	39	"mul %5 ; "
	40	"xor %5,%5 ; "
	41	"add %4,%%eax ; "
	42	"adc %5,%%edx ; "
	43	: "=A" (product), "=r" (tmp1), "=r" (tmp2)
	44	: "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) );
	45	#elif defined(__x86_64__)
	46	__asm__ (
3b217116	47	"mulq %[mul_frac] ; shrd $32, %[hi], %[lo]"
de2d1a52 ZA	48	: [lo]"=a"(product),
	49	[hi]"=d"(tmp)
	50	: "0"(delta),
	51	[mul_frac]"rm"((u64)mul_frac));
347bb444 ZA	52	#else
	53	#error implement me!
	54	#endif
	55
	56	return product;
	57	}
	58
1965aae3	59	#endif /* _ASM_X86_PVCLOCK_H */