146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*-
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* Copyright (c) 2014, Bryan Venteicher <bryanv@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef X86_PVCLOCK
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#define X86_PVCLOCK
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#include <sys/types.h>
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#ifdef _KERNEL
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#include <sys/timetc.h>
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#endif /* _KERNEL */
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#define PVCLOCK_CDEVNAME "pvclock"
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struct pvclock_vcpu_time_info {
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uint32_t version;
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uint32_t pad0;
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uint64_t tsc_timestamp;
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uint64_t system_time;
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uint32_t tsc_to_system_mul;
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int8_t tsc_shift;
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uint8_t flags;
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uint8_t pad[2];
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};
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#define PVCLOCK_FLAG_TSC_STABLE 0x01
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#define PVCLOCK_FLAG_GUEST_PASUED 0x02
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/*
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* Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction,
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* yielding a 64-bit result.
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*/
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static inline uint64_t
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pvclock_scale_delta(uint64_t delta, uint32_t mul_frac, int shift)
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{
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uint64_t product;
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if (shift < 0)
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delta >>= -shift;
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else
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delta <<= shift;
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#if defined(__i386__)
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{
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uint32_t tmp1, tmp2;
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/**
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* For i386, the formula looks like:
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*
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* lower = (mul_frac * (delta & UINT_MAX)) >> 32
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* upper = mul_frac * (delta >> 32)
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* product = lower + upper
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*/
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__asm__ (
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"mul %5 ; "
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"mov %4,%%eax ; "
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"mov %%edx,%4 ; "
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"mul %5 ; "
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"xor %5,%5 ; "
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"add %4,%%eax ; "
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"adc %5,%%edx ; "
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: "=A" (product), "=r" (tmp1), "=r" (tmp2)
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: "a" ((uint32_t)delta), "1" ((uint32_t)(delta >> 32)),
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"2" (mul_frac) );
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}
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#elif defined(__amd64__)
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{
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unsigned long tmp;
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__asm__ (
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"mulq %[mul_frac] ; shrd $32, %[hi], %[lo]"
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: [lo]"=a" (product), [hi]"=d" (tmp)
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: "0" (delta), [mul_frac]"rm"((uint64_t)mul_frac));
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}
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#else
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#error "pvclock: unsupported x86 architecture?"
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#endif
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return (product);
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}
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#ifdef _KERNEL
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typedef struct pvclock_wall_clock *pvclock_get_wallclock_t(void *arg);
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struct pvclock_wall_clock {
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uint32_t version;
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uint32_t sec;
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uint32_t nsec;
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};
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struct pvclock {
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/* Public; initialized by the caller of 'pvclock_init()': */
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pvclock_get_wallclock_t *get_wallclock;
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void *get_wallclock_arg;
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struct pvclock_vcpu_time_info *timeinfos;
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bool stable_flag_supported;
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/* Private; initialized by the 'pvclock' API: */
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bool vdso_force_unstable;
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bool vdso_enable_without_rdtscp;
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struct timecounter tc;
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struct cdev *cdev;
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};
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/*
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* NOTE: 'pvclock_get_timecount()' and 'pvclock_get_wallclock()' are purely
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* transitional; they should be removed after 'dev/xen/timer/timer.c' has been
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* migrated to the 'struct pvclock' API.
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*/
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void pvclock_resume(void);
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uint64_t pvclock_tsc_freq(struct pvclock_vcpu_time_info *ti);
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uint64_t pvclock_get_timecount(struct pvclock_vcpu_time_info *ti);
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void pvclock_get_wallclock(struct pvclock_wall_clock *wc,
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struct timespec *ts);
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void pvclock_init(struct pvclock *pvc, device_t dev,
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const char *tc_name, int tc_quality, u_int tc_flags);
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void pvclock_gettime(struct pvclock *pvc, struct timespec *ts);
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int pvclock_destroy(struct pvclock *pvc);
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#endif /* _KERNEL */
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#endif
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