818bc9596d
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 Introduce basic Tdx functions in BaseLib: - TdCall () - TdVmCall () - TdIsEnabled () Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: James Bottomley <jejb@linux.ibm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
146 lines
3.1 KiB
NASM
146 lines
3.1 KiB
NASM
;------------------------------------------------------------------------------
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;*
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;* Copyright (c) 2020 - 2021, Intel Corporation. All rights reserved.<BR>
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;* SPDX-License-Identifier: BSD-2-Clause-Patent
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;*
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;*
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;------------------------------------------------------------------------------
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DEFAULT REL
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SECTION .text
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%define TDVMCALL_EXPOSE_REGS_MASK 0xffec
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%define TDVMCALL 0x0
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%macro tdcall 0
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db 0x66,0x0f,0x01,0xcc
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%endmacro
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%macro tdcall_push_regs 0
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push rbp
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mov rbp, rsp
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push r15
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push r14
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push r13
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push r12
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push rbx
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push rsi
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push rdi
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%endmacro
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%macro tdcall_pop_regs 0
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pop rdi
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pop rsi
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pop rbx
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pop r12
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pop r13
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pop r14
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pop r15
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pop rbp
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%endmacro
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%define number_of_regs_pushed 8
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%define number_of_parameters 4
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;
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; Keep these in sync for push_regs/pop_regs, code below
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; uses them to find 5th or greater parameters
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;
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%define first_variable_on_stack_offset \
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((number_of_regs_pushed * 8) + (number_of_parameters * 8) + 8)
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%define second_variable_on_stack_offset \
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((first_variable_on_stack_offset) + 8)
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%macro tdcall_regs_preamble 2
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mov rax, %1
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xor rcx, rcx
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mov ecx, %2
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; R10 = 0 (standard TDVMCALL)
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xor r10d, r10d
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; Zero out unused (for standard TDVMCALL) registers to avoid leaking
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; secrets to the VMM.
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xor ebx, ebx
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xor esi, esi
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xor edi, edi
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xor edx, edx
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xor ebp, ebp
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xor r8d, r8d
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xor r9d, r9d
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%endmacro
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%macro tdcall_regs_postamble 0
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xor ebx, ebx
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xor esi, esi
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xor edi, edi
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xor ecx, ecx
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xor edx, edx
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xor r8d, r8d
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xor r9d, r9d
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xor r10d, r10d
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xor r11d, r11d
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%endmacro
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;------------------------------------------------------------------------------
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; 0 => RAX = TDCALL leaf
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; M => RCX = TDVMCALL register behavior
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; 1 => R10 = standard vs. vendor
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; RDI => R11 = TDVMCALL function / nr
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; RSI = R12 = p1
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; RDX => R13 = p2
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; RCX => R14 = p3
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; R8 => R15 = p4
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; UINT64
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; EFIAPI
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; TdVmCall (
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; UINT64 Leaf, // Rcx
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; UINT64 P1, // Rdx
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; UINT64 P2, // R8
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; UINT64 P3, // R9
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; UINT64 P4, // rsp + 0x28
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; UINT64 *Val // rsp + 0x30
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; )
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global ASM_PFX(TdVmCall)
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ASM_PFX(TdVmCall):
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tdcall_push_regs
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mov r11, rcx
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mov r12, rdx
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mov r13, r8
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mov r14, r9
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mov r15, [rsp + first_variable_on_stack_offset ]
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tdcall_regs_preamble TDVMCALL, TDVMCALL_EXPOSE_REGS_MASK
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tdcall
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; ignore return dataif TDCALL reports failure.
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test rax, rax
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jnz .no_return_data
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; Propagate TDVMCALL success/failure to return value.
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mov rax, r10
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; Retrieve the Val pointer.
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mov r9, [rsp + second_variable_on_stack_offset ]
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test r9, r9
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jz .no_return_data
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; On success, propagate TDVMCALL output value to output param
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test rax, rax
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jnz .no_return_data
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mov [r9], r11
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.no_return_data:
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tdcall_regs_postamble
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tdcall_pop_regs
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ret
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