git: pc64: Replace SMSW/LMSW with MOV CR0

[Aaron LI]

commit 06c58923a69137ab8761ae16b30514e2aa1ced27
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Apr 17 12:55:25 2026 +0800

    pc64: Replace SMSW/LMSW with MOV CR0
    
    The SMSW and LMSW instructions are deprecated and provided for
    compatibility with 80286.
    
    Intel SDM Volume 2 Section 4.3:
    > This instruction is provided for compatibility with the Intel 286
    > processor; programs and procedures intended to run on IA-32 and Intel
    > 64 processors beginning with Intel386 processors should use the MOV
    > (control registers) instruction to load the whole CR0 register.
    
    Obtained-from: FreeBSD (commit d706ec297a60775e242168eecbb5160cc692c9a6)
    Discussed-with: dillon

Summary of changes:
 sys/cpu/x86_64/include/cpufunc.h | 6 ++++++
 sys/platform/pc64/x86_64/npx.c   | 7 ++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/06c58923a69137ab8761ae16b30514e2aa1ced27


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