diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/DisablePaging64.S')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/DisablePaging64.S | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/MdePkg/Library/BaseLib/X64/DisablePaging64.S b/MdePkg/Library/BaseLib/X64/DisablePaging64.S index a55059e3be..8c71d2d49e 100644 --- a/MdePkg/Library/BaseLib/X64/DisablePaging64.S +++ b/MdePkg/Library/BaseLib/X64/DisablePaging64.S @@ -51,6 +51,8 @@ L1: mov %cr0,%rax
btr $0x1f,%eax
mov %rax,%cr0 # disable paging
+
+ mov %rdx,%rbx # save EntryPoint to rbx, for rdmsr will overwrite rdx
mov $0xc0000080,%ecx
rdmsr
and $0xfe,%ah # clear LME
@@ -60,6 +62,6 @@ L1: mov %rax,%cr4
push %rdi # push Context2
push %rsi # push Context1
- callq *%rdx # transfer control to EntryPoint
+ callq *%rbx # transfer control to EntryPoint
jmp . # no one should get here
|