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amd64 la57_trampoline: stop using %rdx to remember original %cr0 

Store %cr0 in %ebp.  %rdx is needed for MSR access.

Sponsored by:	Advanced Micro Devices (AMD)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2024-09-11 03:35:43 +03:00
parent 180c8ab079
commit 9a49c98baf
1 changed files with 5 additions and 3 deletions
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8
sys/amd64/amd64/locore.S
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@ -93,9 +93,10 @@ ENTRY(btext)
ENTRY(la57_trampoline)
movq %rsp,%r11
movq %rbx,%r10
movq %rbp,%r9
leaq la57_trampoline_end(%rip),%rsp
movq %cr0,%rdx
movq %cr0,%rbp
lgdtq la57_trampoline_gdt_desc(%rip)
pushq $(2<<3)
@ -109,7 +110,7 @@ ENTRY(la57_trampoline)
l1: movl $(3<<3),%eax
movl %eax,%ss
movl %edx,%eax
movl %ebp,%eax
andl $~CR0_PG,%eax
movl %eax,%cr0
@ -118,7 +119,7 @@ l1: movl $(3<<3),%eax
movl %eax,%cr4
movl %edi,%cr3
movl %edx,%cr0
movl %ebp,%cr0
jmp 1f
1: pushl $(1<<3)
@ -128,6 +129,7 @@ l1: movl $(3<<3),%eax
l2: movq %r11,%rsp
movq %r10,%rbx
movq %r9,%rbp
retq
.p2align 4,0
ENTRY(la57_trampoline_gdt_desc)