mirror of https://github.com/acidanthera/audk.git
76 lines
2.0 KiB
NASM
76 lines
2.0 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2022 - 2023, 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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; Abstract:
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;
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; Switch the stack from temporary memory to permanent memory.
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;
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;------------------------------------------------------------------------------
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SECTION .text
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%include "PushPopRegsNasm.inc"
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extern ASM_PFX(SwapStack)
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;------------------------------------------------------------------------------
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; UINT32
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; EFIAPI
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; Pei2LoaderSwitchStack (
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; VOID
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; )
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;------------------------------------------------------------------------------
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global ASM_PFX(Pei2LoaderSwitchStack)
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ASM_PFX(Pei2LoaderSwitchStack):
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xor rax, rax
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jmp ASM_PFX(FspSwitchStack)
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;------------------------------------------------------------------------------
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; UINT32
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; EFIAPI
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; Loader2PeiSwitchStack (
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; VOID
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; )
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;------------------------------------------------------------------------------
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global ASM_PFX(Loader2PeiSwitchStack)
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ASM_PFX(Loader2PeiSwitchStack):
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jmp ASM_PFX(FspSwitchStack)
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;------------------------------------------------------------------------------
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; UINT32
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; EFIAPI
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; FspSwitchStack (
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; VOID
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; )
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;------------------------------------------------------------------------------
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global ASM_PFX(FspSwitchStack)
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ASM_PFX(FspSwitchStack):
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; Save current contexts. The format must align with CONTEXT_STACK_64.
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push rdx ; Reserved QWORD for stack alignment
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push rdx ; ApiParam2
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push rcx ; ApiParam1
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push rax ; FspInfoHeader
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pushfq
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cli
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PUSHA_64
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sub rsp, 16
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sidt [rsp]
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; Load new stack
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mov rcx, rsp
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sub rsp, 0x20
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call ASM_PFX(SwapStack)
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add rsp, 0x20
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mov rsp, rax
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; Restore previous contexts
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lidt [rsp]
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add rsp, 16
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POPA_64
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popfq
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add rsp, 32 ; FspInfoHeader + ApiParam[2] + Reserved QWORD
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ret
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