projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 9095d37b | 1 | //------------------------------------------------------------------------------\r |
| 08068159 | 2 | //\r |
| 9095d37b | 3 | // Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
| 08068159 | 4 | // Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r |
| c32dcd28 | 5 | // Portions copyright (c) 2011, ARM Limited. All rights reserved.<BR>\r |
| 9344f092 | 6 | // SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 08068159 | 7 | //\r |
| 8 | //------------------------------------------------------------------------------\r | |
| 9095d37b | 9 | \r |
| 08068159 | 10 | .text\r |
| 11 | .align 5\r | |
| 12 | \r | |
| 13 | GCC_ASM_EXPORT(InternalSwitchStackAsm)\r | |
| 9095d37b LG |
14 | GCC_ASM_EXPORT(CpuPause)\r |
| 15 | \r | |
| 08068159 | 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 | VOID\r | |
| 28 | EFIAPI\r | |
| 29 | InternalSwitchStackAsm (\r | |
| 30 | SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
| 31 | VOID *Context,\r | |
| 32 | VOID *Context2,\r | |
| 33 | VOID *NewStack\r | |
| 34 | );\r | |
| 35 | **/\r | |
| 36 | ASM_PFX(InternalSwitchStackAsm):\r | |
| 37 | MOV LR, R0\r | |
| 38 | MOV SP, R3\r | |
| 39 | MOV R0, R1\r | |
| 40 | MOV R1, R2\r | |
| 41 | BX LR\r | |
| 42 | \r | |
| 43 | /**\r | |
| 44 | //\r | |
| 45 | // Requests CPU to pause for a short period of time.\r | |
| 46 | //\r | |
| 47 | // Requests CPU to pause for a short period of time. Typically used in MP\r | |
| 48 | // systems to prevent memory starvation while waiting for a spin lock.\r | |
| 49 | //\r | |
| 50 | VOID\r | |
| 51 | EFIAPI\r | |
| 52 | CpuPause (\r | |
| 53 | VOID\r | |
| 54 | )\r | |
| 55 | **/\r | |
| 56 | ASM_PFX(CpuPause):\r | |
| 57 | nop\r | |
| 58 | nop\r | |
| 59 | nop\r | |
| 60 | nop\r | |
| 61 | nop\r | |
| 62 | BX LR\r |