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Differential D37770 Diff 114381 sys/amd64/amd64/initcpu.c

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sys/amd64/amd64/initcpu.c

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/* /*
* Initialize CPU control registers * Initialize CPU control registers
*/ */
void void
initializecpu(void) initializecpu(void)
{ {
uint64_t msr; uint64_t msr;
uint32_t cr4; uint32_t cr4;
u_int r[4];
int use_invlpg_pmap;
cr4 = rcr4(); cr4 = rcr4();
if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) { if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) {
cr4 |= CR4_FXSR | CR4_XMM; cr4 |= CR4_FXSR | CR4_XMM;
cpu_fxsr = hw_instruction_sse = 1; cpu_fxsr = hw_instruction_sse = 1;
} }
if (cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) if (cpu_stdext_feature & CPUID_STDEXT_FSGSBASE)
cr4 |= CR4_FSGSBASE; cr4 |= CR4_FSGSBASE;
▲ Show 20 Lines • Show All 46 Lines • ▼ Show 20 Linesinitializecpu(void)
case CPU_VENDOR_CENTAUR: case CPU_VENDOR_CENTAUR:
init_via(); init_via();
break; break;
} }
if ((amd_feature & AMDID_RDTSCP) != 0 || if ((amd_feature & AMDID_RDTSCP) != 0 ||
(cpu_stdext_feature2 & CPUID_STDEXT2_RDPID) != 0) (cpu_stdext_feature2 & CPUID_STDEXT2_RDPID) != 0)
wrmsr(MSR_TSC_AUX, cpu_auxmsr()); wrmsr(MSR_TSC_AUX, cpu_auxmsr());
if (cpu_high >= 0x1a) {
cpuid_count(0x1a, 0, r);
if ((r[0] & CPUID_HYBRID_CORE_MASK) ==
karelsUnsubmitted
Done
Inline Actions

Do you want to add macros for these constants? Identifying the E-cores will be useful even without this workaround, e.g. for the scheduler.

karels: Do you want to add macros for these constants? Identifying the E-cores will be useful even…
kibAuthorUnsubmitted
Done
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The identification of small cores is recorded into pcpu data, so it is there. Still added constants.

kib: The identification of small cores is recorded into pcpu data, so it is there. Still added…
CPUID_HYBRID_SMALL_CORE) {
PCPU_SET(small_core, 1);
markjUnsubmitted
Done
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Perhaps add a short comment explaining what is being worked around here. Hopefully this workaround will be deleted soon, but it is worth describing.

markj: Perhaps add a short comment explaining what is being worked around here. Hopefully this…
kibAuthorUnsubmitted
Done
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Added a comment to pmap_invlpg().

kib: Added a comment to pmap_invlpg().
if (pmap_pcid_enabled) {
use_invlpg_pmap = 1;
TUNABLE_INT_FETCH("vm.pmap.pcid_invlpg_bug",
alcUnsubmitted
Done
Inline Actions

This should be updated to match the sysctl name. More broadly, I would suggest updating the name of the local variable, use_invlpg_pmap, to be pcid_invlpg_workaround, and the same for the PCPU field's name.

alc: This should be updated to match the sysctl name. More broadly, I would suggest updating the…
&use_invlpg_pmap);
PCPU_SET(pcid_invlpg_bug, use_invlpg_pmap);
pmap_pcid_invlpg_workaround = use_invlpg_pmap;
}
}
}
} }
void void
initializecpucache(void) initializecpucache(void)
{ {
/* /*
* CPUID with %eax = 1, %ebx returns * CPUID with %eax = 1, %ebx returns
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