1//------------------------------------------------------------------------------ 2// 3// Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR> 4// Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> 5// Portions copyright (c) 2011, ARM Limited. All rights reserved.<BR> 6// This program and the accompanying materials 7// are licensed and made available under the terms and conditions of the BSD License 8// which accompanies this distribution. The full text of the license may be found at 9// http://opensource.org/licenses/bsd-license.php. 10// 11// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 12// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 13// 14//------------------------------------------------------------------------------ 15 16.text 17.align 5 18 19GCC_ASM_EXPORT(InternalSwitchStackAsm) 20GCC_ASM_EXPORT(CpuPause) 21 22/** 23// 24// This allows the caller to switch the stack and goes to the new entry point 25// 26// @param EntryPoint The pointer to the location to enter 27// @param Context Parameter to pass in 28// @param Context2 Parameter2 to pass in 29// @param NewStack New Location of the stack 30// 31// @return Nothing. Goes to the Entry Point passing in the new parameters 32// 33VOID 34EFIAPI 35InternalSwitchStackAsm ( 36 SWITCH_STACK_ENTRY_POINT EntryPoint, 37 VOID *Context, 38 VOID *Context2, 39 VOID *NewStack 40 ); 41**/ 42ASM_PFX(InternalSwitchStackAsm): 43 MOV LR, R0 44 MOV SP, R3 45 MOV R0, R1 46 MOV R1, R2 47 BX LR 48 49/** 50// 51// Requests CPU to pause for a short period of time. 52// 53// Requests CPU to pause for a short period of time. Typically used in MP 54// systems to prevent memory starvation while waiting for a spin lock. 55// 56VOID 57EFIAPI 58CpuPause ( 59 VOID 60 ) 61**/ 62ASM_PFX(CpuPause): 63 nop 64 nop 65 nop 66 nop 67 nop 68 BX LR 69