cpu_auxmsr: assert caller is preventing CPU migration.
Submitted by: Adam Fenn (adam at fenn dot io) Requested by: kib Reviewed by: kib, grehan Approved by: kib MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D26166
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=364656
@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
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#include <machine/cputypes.h>
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#include <machine/md_var.h>
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#include <machine/psl.h>
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#include <machine/specialreg.h>
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#include <vm/vm.h>
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@ -218,11 +219,14 @@ init_via(void)
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}
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/*
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* The value for the TSC_AUX MSR and rdtscp/rdpid.
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* The value for the TSC_AUX MSR and rdtscp/rdpid on the invoking CPU.
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*
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* Caller should prevent CPU migration.
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*/
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u_int
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cpu_auxmsr(void)
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{
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KASSERT((read_rflags() & PSL_I) == 0, ("context switch possible"));
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return (PCPU_GET(cpuid));
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}
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@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
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#include <machine/cputypes.h>
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#include <machine/md_var.h>
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#include <machine/psl.h>
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#include <machine/specialreg.h>
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#include <vm/vm.h>
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@ -628,11 +629,14 @@ init_transmeta(void)
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#endif
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/*
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* The value for the TSC_AUX MSR and rdtscp/rdpid.
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* The value for the TSC_AUX MSR and rdtscp/rdpid on the invoking CPU.
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*
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* Caller should prevent CPU migration.
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*/
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u_int
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cpu_auxmsr(void)
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{
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KASSERT((read_eflags() & PSL_I) == 0, ("context switch possible"));
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return (PCPU_GET(cpuid));
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}
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