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i386: explain the handshake between copyout_fast.s and page fault handler

Description

i386: explain the handshake between copyout_fast.s and page fault handler

Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Details

Provenance
kibAuthored on Sep 9 2022, 8:44 PM
Parents
rGcbbf5227955d: i386: lower register's pressure on copyout_fast
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