OvmfPkg/XenBusDxe/X64/hypercall.nasm

   1 DEFAULT REL
   2 SECTION .text
   3
   4 ; INTN
   5 ; EFIAPI
   6 ; XenHypercall2 (
   7 ;   IN     VOID *HypercallAddr,
   8 ;   IN OUT INTN Arg1,
   9 ;   IN OUT INTN Arg2
  10 ;   );
  11 global ASM_PFX(XenHypercall2)
  12 ASM_PFX(XenHypercall2):
  13   push rdi
  14   push rsi
  15   ; Copy HypercallAddr to rax
  16   mov rax, rcx
  17   ; Copy Arg1 to the register expected by Xen
  18   mov rdi, rdx
  19   ; Copy Arg2 to the register expected by Xen
  20   mov rsi, r8
  21   ; Call HypercallAddr
  22   call rax
  23   pop rsi
  24   pop rdi
  25   ret
  26