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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,9 @@ | ||
| KMOD= kvmclock | ||
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| SRCS= kvm_clock.c pvclock.c | ||
| SRCS= kvm_clock.c pvclock.c rdtsc_ordered.c | ||
| SRCS+= bus_if.h clock_if.h device_if.h | ||
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| CFLAGS+= -Iinclude | ||
| CFLAGS+= -DINVARIANTS -DINVARIANT_SUPPORT | ||
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| .include <bsd.kmod.mk> |
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| @@ -0,0 +1,120 @@ | ||
| /*- | ||
| * SPDX-License-Identifier: BSD-2-Clause-FreeBSD | ||
| * | ||
| * Copyright (c) 2021 Juniper Networks, Inc. | ||
| * Copyright (c) 2021 Klara, Inc. | ||
| * | ||
| * 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. | ||
| * | ||
| * $FreeBSD$ | ||
| */ | ||
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| #ifndef _X86__RDTSC_ORDERED_H_ | ||
| #define _X86__RDTSC_ORDERED_H_ | ||
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| #include <sys/types.h> | ||
| #include <machine/cpufunc.h> | ||
| #include <machine/cputypes.h> | ||
| #include <machine/specialreg.h> | ||
| #include <x86/ifunc.h> | ||
| #include <x86/rdtsc_ordered.h> | ||
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| #ifdef _KERNEL | ||
| #include <sys/pcpu.h> | ||
| #include <machine/md_var.h> | ||
| #else /* !_KERNEL */ | ||
| #include <stdbool.h> | ||
| #include <string.h> | ||
| #endif /* _KERNEL */ | ||
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| #define DEFINE_RDTSC_ORDERED_COMMON() \ | ||
| static uint64_t \ | ||
| rdtsc_ordered_lfence(void) \ | ||
| { \ | ||
| lfence(); \ | ||
| return (rdtsc()); \ | ||
| } \ | ||
| static uint64_t \ | ||
| rdtsc_ordered_mfence(void) \ | ||
| { \ | ||
| mfence(); \ | ||
| return (rdtsc()); \ | ||
| } \ | ||
| static inline uint64_t (*rdtsc_ordered_select(u_int amd_feature, \ | ||
| u_int cpu_feature, bool cpu_is_amd))(void) \ | ||
| { \ | ||
| if ((amd_feature & AMDID_RDTSCP) != 0) \ | ||
| return (rdtscp); \ | ||
| else if ((cpu_feature & CPUID_SSE2) != 0) \ | ||
| if (cpu_is_amd) \ | ||
| return (rdtsc_ordered_mfence); \ | ||
| else \ | ||
| return (rdtsc_ordered_lfence); \ | ||
| else \ | ||
| return (rdtsc); \ | ||
| } | ||
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| #ifdef _KERNEL | ||
| #define DEFINE_RDTSC_ORDERED() \ | ||
| DEFINE_RDTSC_ORDERED_COMMON() \ | ||
| DEFINE_IFUNC(, uint64_t, rdtsc_ordered, (void)) \ | ||
| { \ | ||
| bool cpu_is_amd = cpu_vendor_id == CPU_VENDOR_AMD || \ | ||
| cpu_vendor_id == CPU_VENDOR_HYGON; \ | ||
| \ | ||
| return (rdtsc_ordered_select(amd_feature, cpu_feature, \ | ||
| cpu_is_amd)); \ | ||
| } | ||
| #else /* !_KERNEL */ | ||
| #define DEFINE_RDTSC_ORDERED() \ | ||
| DEFINE_RDTSC_ORDERED_COMMON() \ | ||
| DEFINE_UIFUNC(, uint64_t, rdtsc_ordered, (void)) \ | ||
| { \ | ||
| u_int amd_feature, cpu_exthigh, p[4], v[3]; \ | ||
| static const char amd_id[] = "AuthenticAMD"; \ | ||
| static const char hygon_id[] = "HygonGenuine"; \ | ||
| bool cpu_is_amd; \ | ||
| \ | ||
| do_cpuid(0, p); \ | ||
| v[0] = p[1]; \ | ||
| v[1] = p[3]; \ | ||
| v[2] = p[2]; \ | ||
| cpu_is_amd = memcmp(v, amd_id, sizeof(amd_id) - 1) == 0 || \ | ||
| memcmp(v, hygon_id, sizeof(hygon_id) - 1) == 0; \ | ||
| if (cpu_feature != 0) { \ | ||
| do_cpuid(0x80000000, p); \ | ||
| cpu_exthigh = p[0]; \ | ||
| } else { \ | ||
| cpu_exthigh = 0; \ | ||
| } \ | ||
| if (cpu_exthigh >= 0x80000001) { \ | ||
| do_cpuid(0x80000001, p); \ | ||
| amd_feature = p[3]; \ | ||
| } else { \ | ||
| amd_feature = 0; \ | ||
| } \ | ||
| return (rdtsc_ordered_select(amd_feature, cpu_feature, \ | ||
| cpu_is_amd)); \ | ||
| } | ||
| #endif /* _KERNEL */ | ||
|
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| #endif /* !_X86__RDTSC_ORDERED_H_ */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| /*- | ||
| * SPDX-License-Identifier: BSD-2-Clause-FreeBSD | ||
| * | ||
| * Copyright (c) 2021 Juniper Networks, Inc. | ||
| * Copyright (c) 2021 Klara, Inc. | ||
| * | ||
| * 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. | ||
| * | ||
| * $FreeBSD$ | ||
| */ | ||
|
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| #ifndef _X86_RDTSC_ORDERED_H_ | ||
| #define _X86_RDTSC_ORDERED_H_ | ||
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| #include <sys/types.h> | ||
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| uint64_t rdtsc_ordered(void); | ||
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| #endif /* !_X86_RDTSC_ORDERED_H_ */ |
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