1 files changed, 26 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Library/XenHypercallLib/X64/hypercall.nasm b/roms/edk2/OvmfPkg/Library/XenHypercallLib/X64/hypercall.nasm
new file mode 100644
index 000000000..5e6a0c05c
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Library/XenHypercallLib/X64/hypercall.nasm
@@ -0,0 +1,26 @@
+DEFAULT REL
+SECTION .text
+
+; INTN
+; EFIAPI
+; __XenHypercall2 (
+;   IN     VOID *HypercallAddr,
+;   IN OUT INTN Arg1,
+;   IN OUT INTN Arg2
+;   );
+global ASM_PFX(__XenHypercall2)
+ASM_PFX(__XenHypercall2):
+  push rdi
+  push rsi
+  ; Copy HypercallAddr to rax
+  mov rax, rcx
+  ; Copy Arg1 to the register expected by Xen
+  mov rdi, rdx
+  ; Copy Arg2 to the register expected by Xen
+  mov rsi, r8
+  ; Call HypercallAddr
+  call rax
+  pop rsi
+  pop rdi
+  ret
+