| ;------------------------------------------------------------------------------ | |
| ; | |
| ; Copyright (c) 2022 - 2023, Intel Corporation. All rights reserved.<BR> | |
| ; SPDX-License-Identifier: BSD-2-Clause-Patent | |
| ; | |
| ; Abstract: | |
| ; | |
| ; Switch the stack from temporary memory to permanent memory. | |
| ; | |
| ;------------------------------------------------------------------------------ | |
| SECTION .text | |
| %include "PushPopRegsNasm.inc" | |
| extern ASM_PFX(SwapStack) | |
| ;------------------------------------------------------------------------------ | |
| ; UINT32 | |
| ; EFIAPI | |
| ; Pei2LoaderSwitchStack ( | |
| ; VOID | |
| ; ) | |
| ;------------------------------------------------------------------------------ | |
| global ASM_PFX(Pei2LoaderSwitchStack) | |
| ASM_PFX(Pei2LoaderSwitchStack): | |
| xor rax, rax | |
| jmp ASM_PFX(FspSwitchStack) | |
| ;------------------------------------------------------------------------------ | |
| ; UINT32 | |
| ; EFIAPI | |
| ; Loader2PeiSwitchStack ( | |
| ; VOID | |
| ; ) | |
| ;------------------------------------------------------------------------------ | |
| global ASM_PFX(Loader2PeiSwitchStack) | |
| ASM_PFX(Loader2PeiSwitchStack): | |
| jmp ASM_PFX(FspSwitchStack) | |
| ;------------------------------------------------------------------------------ | |
| ; UINT32 | |
| ; EFIAPI | |
| ; FspSwitchStack ( | |
| ; VOID | |
| ; ) | |
| ;------------------------------------------------------------------------------ | |
| global ASM_PFX(FspSwitchStack) | |
| ASM_PFX(FspSwitchStack): | |
| ; Save current contexts. The format must align with CONTEXT_STACK_64. | |
| push rdx ; Reserved QWORD for stack alignment | |
| push rdx ; ApiParam2 | |
| push rcx ; ApiParam1 | |
| push rax ; FspInfoHeader | |
| pushfq | |
| cli | |
| PUSHA_64 | |
| sub rsp, 16 | |
| sidt [rsp] | |
| ; Load new stack | |
| mov rcx, rsp | |
| sub rsp, 0x20 | |
| call ASM_PFX(SwapStack) | |
| add rsp, 0x20 | |
| mov rsp, rax | |
| ; Restore previous contexts | |
| lidt [rsp] | |
| add rsp, 16 | |
| POPA_64 | |
| popfq | |
| add rsp, 32 ; FspInfoHeader + ApiParam[2] + Reserved QWORD | |
| ret | |