mirror of
https://github.com/freebsd/freebsd-src
synced 2024-10-03 07:04:53 +00:00
95ee2897e9
Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/
146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*-
|
|
* Copyright (c) 2014, Bryan Venteicher <bryanv@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef X86_PVCLOCK
|
|
#define X86_PVCLOCK
|
|
|
|
#include <sys/types.h>
|
|
|
|
#ifdef _KERNEL
|
|
#include <sys/timetc.h>
|
|
#endif /* _KERNEL */
|
|
|
|
#define PVCLOCK_CDEVNAME "pvclock"
|
|
|
|
struct pvclock_vcpu_time_info {
|
|
uint32_t version;
|
|
uint32_t pad0;
|
|
uint64_t tsc_timestamp;
|
|
uint64_t system_time;
|
|
uint32_t tsc_to_system_mul;
|
|
int8_t tsc_shift;
|
|
uint8_t flags;
|
|
uint8_t pad[2];
|
|
};
|
|
|
|
#define PVCLOCK_FLAG_TSC_STABLE 0x01
|
|
#define PVCLOCK_FLAG_GUEST_PASUED 0x02
|
|
|
|
/*
|
|
* Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction,
|
|
* yielding a 64-bit result.
|
|
*/
|
|
static inline uint64_t
|
|
pvclock_scale_delta(uint64_t delta, uint32_t mul_frac, int shift)
|
|
{
|
|
uint64_t product;
|
|
|
|
if (shift < 0)
|
|
delta >>= -shift;
|
|
else
|
|
delta <<= shift;
|
|
#if defined(__i386__)
|
|
{
|
|
uint32_t tmp1, tmp2;
|
|
|
|
/**
|
|
* For i386, the formula looks like:
|
|
*
|
|
* lower = (mul_frac * (delta & UINT_MAX)) >> 32
|
|
* upper = mul_frac * (delta >> 32)
|
|
* product = lower + upper
|
|
*/
|
|
__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" ((uint32_t)delta), "1" ((uint32_t)(delta >> 32)),
|
|
"2" (mul_frac) );
|
|
}
|
|
#elif defined(__amd64__)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
__asm__ (
|
|
"mulq %[mul_frac] ; shrd $32, %[hi], %[lo]"
|
|
: [lo]"=a" (product), [hi]"=d" (tmp)
|
|
: "0" (delta), [mul_frac]"rm"((uint64_t)mul_frac));
|
|
}
|
|
#else
|
|
#error "pvclock: unsupported x86 architecture?"
|
|
#endif
|
|
return (product);
|
|
}
|
|
|
|
#ifdef _KERNEL
|
|
|
|
typedef struct pvclock_wall_clock *pvclock_get_wallclock_t(void *arg);
|
|
|
|
struct pvclock_wall_clock {
|
|
uint32_t version;
|
|
uint32_t sec;
|
|
uint32_t nsec;
|
|
};
|
|
|
|
struct pvclock {
|
|
/* Public; initialized by the caller of 'pvclock_init()': */
|
|
pvclock_get_wallclock_t *get_wallclock;
|
|
void *get_wallclock_arg;
|
|
struct pvclock_vcpu_time_info *timeinfos;
|
|
bool stable_flag_supported;
|
|
|
|
/* Private; initialized by the 'pvclock' API: */
|
|
bool vdso_force_unstable;
|
|
bool vdso_enable_without_rdtscp;
|
|
struct timecounter tc;
|
|
struct cdev *cdev;
|
|
};
|
|
|
|
/*
|
|
* NOTE: 'pvclock_get_timecount()' and 'pvclock_get_wallclock()' are purely
|
|
* transitional; they should be removed after 'dev/xen/timer/timer.c' has been
|
|
* migrated to the 'struct pvclock' API.
|
|
*/
|
|
void pvclock_resume(void);
|
|
uint64_t pvclock_tsc_freq(struct pvclock_vcpu_time_info *ti);
|
|
uint64_t pvclock_get_timecount(struct pvclock_vcpu_time_info *ti);
|
|
void pvclock_get_wallclock(struct pvclock_wall_clock *wc,
|
|
struct timespec *ts);
|
|
|
|
void pvclock_init(struct pvclock *pvc, device_t dev,
|
|
const char *tc_name, int tc_quality, u_int tc_flags);
|
|
void pvclock_gettime(struct pvclock *pvc, struct timespec *ts);
|
|
int pvclock_destroy(struct pvclock *pvc);
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif
|