1#------------------------------------------------------------------------------ 2# 3# Copyright (c) 2014 - 2015, Intel Corporation. All rights reserved.<BR> 4# This program and the accompanying materials 5# are licensed and made available under the terms and conditions of the BSD License 6# which accompanies this distribution. The full text of the license may be found at 7# http://opensource.org/licenses/bsd-license.php. 8# 9# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11# 12# Abstract: 13# 14# Switch the stack from temporary memory to permenent memory. 15# 16#------------------------------------------------------------------------------ 17 18 19#------------------------------------------------------------------------------ 20# UINT32 21# EFIAPI 22# Pei2LoaderSwitchStack ( 23# VOID 24# ) 25#------------------------------------------------------------------------------ 26ASM_GLOBAL ASM_PFX(Pei2LoaderSwitchStack) 27ASM_PFX(Pei2LoaderSwitchStack): 28 xorl %eax, %eax 29 jmp ASM_PFX(FspSwitchStack) 30 31#------------------------------------------------------------------------------ 32# UINT32 33# EFIAPI 34# Loader2PeiSwitchStack ( 35# VOID 36# ) 37#------------------------------------------------------------------------------ 38ASM_GLOBAL ASM_PFX(Loader2PeiSwitchStack) 39ASM_PFX(Loader2PeiSwitchStack): 40 jmp ASM_PFX(FspSwitchStack) 41 42#------------------------------------------------------------------------------ 43# UINT32 44# EFIAPI 45# FspSwitchStack ( 46# VOID 47# ) 48#------------------------------------------------------------------------------ 49ASM_GLOBAL ASM_PFX(FspSwitchStack) 50ASM_PFX(FspSwitchStack): 51 # 52 #Save current contexts 53 # 54 push %eax 55 pushf 56 cli 57 pusha 58 sub $0x08, %esp 59 sidt (%esp) 60 61 # 62 # Load new stack 63 # 64 push %esp 65 call ASM_PFX(SwapStack) 66 movl %eax, %esp 67 68 # 69 # Restore previous contexts 70 # 71 lidt (%esp) 72 add $0x08,%esp 73 popa 74 popf 75 add $0x04,%esp 76 ret 77 78 79