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amd64 la57_trampoline: disable EFER.LME around setting CR4.LA57

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(cherry picked from commit b7ea2b69ef666ee8cdc6dcc814d610df0a7f0999)
This commit is contained in:
Konstantin Belousov 2024-09-11 03:39:30 +03:00
parent 7a1723912e
commit 3f79c8c46f
1 changed files with 10 additions and 0 deletions
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10
sys/amd64/amd64/locore.S
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@ -114,11 +114,21 @@ l1: movl $(3<<3),%eax
andl $~CR0_PG,%eax
movl %eax,%cr0
movl $MSR_EFER,%ecx
rdmsr
andl $~EFER_LME,%eax
wrmsr
movl %cr4,%eax
orl $CR4_LA57,%eax
movl %eax,%cr4
movl %edi,%cr3
rdmsr
orl $EFER_LME,%eax
wrmsr
movl %ebp,%cr0
jmp 1f