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0e6f6c715c
This removes the need to allocate memory for the hypercall page, particularly for use during runtime. This also makes the library usable in all phases, so LIBRARY_CLASS can remove the restrictions. The processor vendor is used to select vmmcall or vmcall instructions. The listed vendors are those in the Xen tree. Signed-off-by: Jason Andryuk <jason.andryuk@amd.com>
49 lines
1.1 KiB
NASM
49 lines
1.1 KiB
NASM
SECTION .text
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; INTN
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; EFIAPI
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; __XenVmmcall2 (
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; IN INTN HypercallNum,
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; IN OUT INTN Arg1,
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; IN OUT INTN Arg2
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; );
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global ASM_PFX(__XenVmmcall2)
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ASM_PFX(__XenVmmcall2):
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; Save only ebx, ecx is supposed to be a scratch register and needs to be
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; saved by the caller
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push ebx
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; Copy HypercallNum to eax
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mov eax, [esp + 8]
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; Copy Arg1 to the register expected by Xen
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mov ebx, [esp + 12]
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; Copy Arg2 to the register expected by Xen
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mov ecx, [esp + 16]
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; Call Hypercall
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vmmcall
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pop ebx
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ret
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; INTN
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; EFIAPI
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; __XenVmcall2 (
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; IN INTN HypercallNum,
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; IN OUT INTN Arg1,
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; IN OUT INTN Arg2
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; );
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global ASM_PFX(__XenVmcall2)
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ASM_PFX(__XenVmcall2):
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; Save only ebx, ecx is supposed to be a scratch register and needs to be
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; saved by the caller
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push ebx
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; Copy HypercallNum to eax
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mov eax, [esp + 8]
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; Copy Arg1 to the register expected by Xen
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mov ebx, [esp + 12]
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; Copy Arg2 to the register expected by Xen
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mov ecx, [esp + 16]
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; Call Hypercall
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vmcall
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pop ebx
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ret
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