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Differential D44497

x86: test the right CPUID bit when checking for XSAVEOPT support
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Authored by kib on Mar 25 2024, 1:54 PM.

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rG960d151eaa1e: x86: test the right CPUID bit when checking for XSAVEOPT support

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rG FreeBSD src repository

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kib created this revision.Mar 25 2024, 1:54 PM

Herald added a subscriber: imp. · View Herald TranscriptMar 25 2024, 1:54 PM

kib requested review of this revision.Mar 25 2024, 1:54 PM

kib added a reviewer: emaste.Mar 25 2024, 3:32 PM

emaste accepted this revision.Mar 25 2024, 5:29 PM

emaste added inline comments.

sys/amd64/amd64/fpu.c
241	possibly `CPUID_EXTSTATE_XSAVEOPT` should be renamed also (avoiding `EXTSTATE`)? (it looks like Linux has a single namespace for all of the CPUID data and calls this bit `X86_FEATURE_XSAVEOPT`)

This revision is now accepted and ready to land.Mar 25 2024, 5:29 PM

kib added inline comments.Mar 26 2024, 2:03 AM

sys/amd64/amd64/fpu.c
241	EXTSTATE designates the different word from CPUID. Linux' X86_FEATURE are not CPUID bits, they are calculated software bits.

Closed by commit rG960d151eaa1e: x86: test the right CPUID bit when checking for XSAVEOPT support (authored by kib). · Explain WhyMar 26 2024, 2:09 AM

This revision was automatically updated to reflect the committed changes.

kib added a commit: rG960d151eaa1e: x86: test the right CPUID bit when checking for XSAVEOPT support.

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sys/

amd64/

amd64/

5 lines

i386/

i386/

8 lines

Diff 136208

sys/amd64/amd64/fpu.c

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sys/i386/i386/npx.c

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