projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| ec661594 PB |
1 | #------------------------------------------------------------------------------\r |
| 2 | #\r | |
| 3 | # Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r | |
| 4 | # Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
| 5 | # Portions copyright (c) 2011 - 2013, ARM Limited. All rights reserved.<BR>\r | |
| 9344f092 | 6 | # SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| ec661594 PB |
7 | #\r |
| 8 | #------------------------------------------------------------------------------\r | |
| 807e2604 HL |
9 | \r |
| 10 | .text\r | |
| 11 | .align 5\r | |
| 12 | \r | |
| 0f895683 OM |
13 | GCC_ASM_EXPORT(InternalSwitchStackAsm)\r |
| 14 | GCC_ASM_EXPORT(CpuPause)\r | |
| 807e2604 | 15 | \r |
| ec661594 PB |
16 | #/**\r |
| 17 | #\r | |
| 18 | # This allows the caller to switch the stack and goes to the new entry point\r | |
| 19 | #\r | |
| 20 | # @param EntryPoint The pointer to the location to enter\r | |
| 21 | # @param Context Parameter to pass in\r | |
| 22 | # @param Context2 Parameter2 to pass in\r | |
| 23 | # @param NewStack New Location of the stack\r | |
| 24 | #\r | |
| 25 | # @return Nothing. Goes to the Entry Point passing in the new parameters\r | |
| 26 | #\r | |
| 27 | #**/\r | |
| 28 | #VOID\r | |
| 29 | #EFIAPI\r | |
| 30 | #InternalSwitchStackAsm (\r | |
| 31 | # SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
| 32 | # VOID *Context,\r | |
| 33 | # VOID *Context2,\r | |
| 34 | # VOID *NewStack\r | |
| 35 | # );\r | |
| 36 | #\r | |
| 807e2604 | 37 | ASM_PFX(InternalSwitchStackAsm):\r |
| 35071e15 | 38 | mov x29, #0\r |
| 807e2604 HL |
39 | mov x30, x0\r |
| 40 | mov sp, x3\r | |
| 41 | mov x0, x1\r | |
| 42 | mov x1, x2\r | |
| 43 | ret\r | |
| 44 | \r | |
| ec661594 PB |
45 | #/**\r |
| 46 | #\r | |
| 47 | # Requests CPU to pause for a short period of time.\r | |
| 48 | #\r | |
| 49 | # Requests CPU to pause for a short period of time. Typically used in MP\r | |
| 50 | # systems to prevent memory starvation while waiting for a spin lock.\r | |
| 51 | #\r | |
| 52 | #**/\r | |
| 53 | #VOID\r | |
| 54 | #EFIAPI\r | |
| 55 | #CpuPause (\r | |
| 56 | # VOID\r | |
| 57 | # )\r | |
| 58 | #\r | |
| 807e2604 HL |
59 | ASM_PFX(CpuPause):\r |
| 60 | nop\r | |
| 61 | nop\r | |
| 62 | nop\r | |
| 63 | nop\r | |
| 64 | nop\r | |
| 65 | ret\r |