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-rw-r--r--src/arch/x86/wakeup.S28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/arch/x86/wakeup.S b/src/arch/x86/wakeup.S
index 38d6ea43ae..acc8737550 100644
--- a/src/arch/x86/wakeup.S
+++ b/src/arch/x86/wakeup.S
@@ -32,6 +32,34 @@
.globl __wakeup
__wakeup:
+#ifdef __x86_64__
+ .intel_syntax noprefix
+ xor rax,rax
+ mov ax, ss
+ push rax
+ mov rax, rsp
+ add rax, 8
+ push rax
+ pushfq
+ push 0x10
+ lea rax,[rip+3]
+ push rax
+ iretq
+
+ .code32
+
+ /* disable paging */
+ mov eax, cr0
+ btc eax, 31
+ mov cr0, eax
+
+ /* disable long mode */
+ mov ecx, 0xC0000080
+ rdmsr
+ btc eax, 8
+ wrmsr
+ .att_syntax prefix
+#endif
/* First prepare the jmp to the resume vector */
mov 0x4(%esp), %eax /* vector */
/* last 4 bits of linear addr are taken as offset */