projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 807e2604 HL |
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 | |
| 15 | \r | |
| 16 | .text\r | |
| 17 | .align 5\r | |
| 18 | \r | |
| 0f895683 OM |
19 | GCC_ASM_EXPORT(InternalSwitchStackAsm)\r |
| 20 | GCC_ASM_EXPORT(CpuPause)\r | |
| 807e2604 HL |
21 | \r |
| 22 | /**\r | |
| 23 | //\r | |
| 24 | // This allows the caller to switch the stack and goes to the new entry point\r | |
| 25 | //\r | |
| 26 | // @param EntryPoint The pointer to the location to enter\r | |
| 27 | // @param Context Parameter to pass in\r | |
| 28 | // @param Context2 Parameter2 to pass in\r | |
| 29 | // @param NewStack New Location of the stack\r | |
| 30 | //\r | |
| 31 | // @return Nothing. Goes to the Entry Point passing in the new parameters\r | |
| 32 | //\r | |
| 33 | VOID\r | |
| 34 | EFIAPI\r | |
| 35 | InternalSwitchStackAsm (\r | |
| 36 | SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
| 37 | VOID *Context,\r | |
| 38 | VOID *Context2,\r | |
| 39 | VOID *NewStack\r | |
| 40 | );\r | |
| 41 | **/\r | |
| 42 | ASM_PFX(InternalSwitchStackAsm):\r | |
| 35071e15 | 43 | mov x29, #0\r |
| 807e2604 HL |
44 | mov x30, x0\r |
| 45 | mov sp, x3\r | |
| 46 | mov x0, x1\r | |
| 47 | mov x1, x2\r | |
| 48 | ret\r | |
| 49 | \r | |
| 50 | /**\r | |
| 51 | //\r | |
| 52 | // Requests CPU to pause for a short period of time.\r | |
| 53 | //\r | |
| 54 | // Requests CPU to pause for a short period of time. Typically used in MP\r | |
| 55 | // systems to prevent memory starvation while waiting for a spin lock.\r | |
| 56 | //\r | |
| 57 | VOID\r | |
| 58 | EFIAPI\r | |
| 59 | CpuPause (\r | |
| 60 | VOID\r | |
| 61 | )\r | |
| 62 | **/\r | |
| 63 | ASM_PFX(CpuPause):\r | |
| 64 | nop\r | |
| 65 | nop\r | |
| 66 | nop\r | |
| 67 | nop\r | |
| 68 | nop\r | |
| 69 | ret\r |