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>
86 lines
1.8 KiB
NASM
86 lines
1.8 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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%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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; TdCall (
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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 Results, // rsp + 0x28
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; )
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global ASM_PFX(TdCall)
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ASM_PFX(TdCall):
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tdcall_push_regs
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mov rax, rcx
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mov rcx, rdx
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mov rdx, r8
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mov r8, r9
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tdcall
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; exit if tdcall reports failure.
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test rax, rax
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jnz .exit
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; test if caller wanted results
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mov r12, [rsp + first_variable_on_stack_offset ]
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test r12, r12
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jz .exit
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mov [r12 + 0 ], rcx
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mov [r12 + 8 ], rdx
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mov [r12 + 16], r8
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mov [r12 + 24], r9
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mov [r12 + 32], r10
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mov [r12 + 40], r11
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.exit:
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tdcall_pop_regs
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ret
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