| /* SPDX-License-Identifier: GPL-2.0 */ |
| #include <asm/asm-offsets.h> |
| #include <asm/frame.h> |
| #include <asm/tdx.h> |
| |
| /* |
| * TDCALL and SEAMCALL are supported in Binutils >= 2.36. |
| */ |
| #define tdcall .byte 0x66,0x0f,0x01,0xcc |
| #define seamcall .byte 0x66,0x0f,0x01,0xcf |
| |
| /* |
| * TDX_MODULE_CALL - common helper macro for both |
| * TDCALL and SEAMCALL instructions. |
| * |
| * TDCALL - used by TDX guests to make requests to the |
| * TDX module and hypercalls to the VMM. |
| * SEAMCALL - used by TDX hosts to make requests to the |
| * TDX module. |
| * |
| *------------------------------------------------------------------------- |
| * TDCALL/SEAMCALL ABI: |
| *------------------------------------------------------------------------- |
| * Input Registers: |
| * |
| * RAX - TDCALL/SEAMCALL Leaf number. |
| * RCX,RDX,R8-R11 - TDCALL/SEAMCALL Leaf specific input registers. |
| * |
| * Output Registers: |
| * |
| * RAX - TDCALL/SEAMCALL instruction error code. |
| * RCX,RDX,R8-R11 - TDCALL/SEAMCALL Leaf specific output registers. |
| * |
| *------------------------------------------------------------------------- |
| */ |
| .macro TDX_MODULE_CALL host:req ret=0 |
| FRAME_BEGIN |
| |
| /* Move Leaf ID to RAX */ |
| mov %rdi, %rax |
| |
| /* Move other input regs from 'struct tdx_module_args' */ |
| movq TDX_MODULE_rcx(%rsi), %rcx |
| movq TDX_MODULE_rdx(%rsi), %rdx |
| movq TDX_MODULE_r8(%rsi), %r8 |
| movq TDX_MODULE_r9(%rsi), %r9 |
| movq TDX_MODULE_r10(%rsi), %r10 |
| movq TDX_MODULE_r11(%rsi), %r11 |
| |
| .if \host |
| seamcall |
| /* |
| * SEAMCALL instruction is essentially a VMExit from VMX root |
| * mode to SEAM VMX root mode. VMfailInvalid (CF=1) indicates |
| * that the targeted SEAM firmware is not loaded or disabled, |
| * or P-SEAMLDR is busy with another SEAMCALL. %rax is not |
| * changed in this case. |
| * |
| * Set %rax to TDX_SEAMCALL_VMFAILINVALID for VMfailInvalid. |
| * This value will never be used as actual SEAMCALL error code as |
| * it is from the Reserved status code class. |
| */ |
| jc .Lseamcall_vmfailinvalid\@ |
| .else |
| tdcall |
| .endif |
| |
| .if \ret |
| /* Copy output registers to the structure */ |
| movq %rcx, TDX_MODULE_rcx(%rsi) |
| movq %rdx, TDX_MODULE_rdx(%rsi) |
| movq %r8, TDX_MODULE_r8(%rsi) |
| movq %r9, TDX_MODULE_r9(%rsi) |
| movq %r10, TDX_MODULE_r10(%rsi) |
| movq %r11, TDX_MODULE_r11(%rsi) |
| .endif |
| |
| .if \host |
| .Lout\@: |
| .endif |
| FRAME_END |
| RET |
| |
| .if \host |
| .Lseamcall_vmfailinvalid\@: |
| mov $TDX_SEAMCALL_VMFAILINVALID, %rax |
| jmp .Lout\@ |
| .endif /* \host */ |
| |
| .endm |
