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 | |
| 6 | ; This program and the accompanying materials\r | |
| 7 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
| 8 | ; which accompanies this distribution. The full text of the license may be found at\r | |
| 9 | ; http://opensource.org/licenses/bsd-license.php.\r | |
| 10 | ;\r | |
| 11 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 12 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 13 | ;\r | |
| 14 | ;------------------------------------------------------------------------------\r | |
| da351bdb PB |
15 | \r |
| 16 | EXPORT InternalSwitchStackAsm\r | |
| 17 | EXPORT CpuPause\r | |
| 18 | AREA BaseLib_LowLevel, CODE, READONLY\r | |
| 19 | \r | |
| ec661594 PB |
20 | ;/**\r |
| 21 | ;\r | |
| 22 | ; This allows the caller to switch the stack and goes to the new entry point\r | |
| 23 | ;\r | |
| 24 | ; @param EntryPoint The pointer to the location to enter\r | |
| 25 | ; @param Context Parameter to pass in\r | |
| 26 | ; @param Context2 Parameter2 to pass in\r | |
| 27 | ; @param NewStack New Location of the stack\r | |
| 28 | ;\r | |
| 29 | ; @return Nothing. Goes to the Entry Point passing in the new parameters\r | |
| 30 | ;\r | |
| 31 | ;**/\r | |
| 32 | ;VOID\r | |
| 33 | ;EFIAPI\r | |
| 34 | ;InternalSwitchStackAsm (\r | |
| 35 | ; SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
| 36 | ; VOID *Context,\r | |
| 37 | ; VOID *Context2,\r | |
| 38 | ; VOID *NewStack\r | |
| 39 | ; );\r | |
| 40 | ;\r | |
| da351bdb PB |
41 | InternalSwitchStackAsm\r |
| 42 | mov x29, #0\r | |
| 43 | mov x30, x0\r | |
| 44 | mov sp, x3\r | |
| 45 | mov x0, x1\r | |
| 46 | mov x1, x2\r | |
| 47 | ret\r | |
| 48 | \r | |
| ec661594 PB |
49 | ;/**\r |
| 50 | ;\r | |
| 51 | ; Requests CPU to pause for a short period of time.\r | |
| 52 | ;\r | |
| 53 | ; Requests CPU to pause for a short period of time. Typically used in MP\r | |
| 54 | ; systems to prevent memory starvation while waiting for a spin lock.\r | |
| 55 | ;\r | |
| 56 | ;**/\r | |
| 57 | ;VOID\r | |
| 58 | ;EFIAPI\r | |
| 59 | ;CpuPause (\r | |
| 60 | ; VOID\r | |
| 61 | ; )\r | |
| 62 | ;\r | |
| da351bdb PB |
63 | CpuPause\r |
| 64 | nop\r | |
| 65 | nop\r | |
| 66 | nop\r | |
| 67 | nop\r | |
| 68 | nop\r | |
| 69 | ret\r | |
| 70 | \r | |
| 71 | END\r |