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Differential D15581

Only crop the VPN on POWER4 and derivatives for TLBIE operations
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Authored by jhibbits on May 26 2018, 12:28 AM.

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Reviewers
nwhitehorn
breno.leitao_gmail.com
leandro.lupori_gmail.com
Commits
rS334230: Only crop the VPN on POWER4 and derivatives for TLBIE operations
Summary

PowerISA 2.03 and later require bits 14:65 in the RB register argument,
which is the full value of the vpn argument post-shift. Only POWER4, POWER4+,
and PPC970* need the upper 16 bits cropped.

With this change FreeBSD can boot to multi-user on POWER9.

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Repository
rS FreeBSD src repository - subversion
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

jhibbits created this revision.May 26 2018, 12:28 AM
Herald added a subscriber: imp. · View Herald TranscriptMay 26 2018, 12:28 AM
Harbormaster completed remote builds in B16855: Diff 43025.May 26 2018, 12:28 AM
nwhitehorn accepted this revision.May 26 2018, 12:29 AM

On POWER9, I think the lock is unnecessary (the ISA spec doesn't mention it).

This revision is now accepted and ready to land.May 26 2018, 12:29 AM
jhibbits added a comment.May 26 2018, 12:39 AM
In D15581#329046, @nwhitehorn wrote:

On POWER9, I think the lock is unnecessary (the ISA spec doesn't mention it).

I can revisit that later. First make it work, then make it fast.

Closed by commit rS334230: Only crop the VPN on POWER4 and derivatives for TLBIE operations (authored by jhibbits). · Explain WhyMay 26 2018, 12:42 AM
This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

PathSize
head/
sys/
powerpc/
aim/
15 lines

Diff 43026

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head/sys/powerpc/aim/moea64_native.c

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