projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 79e4f2a5 RN |
1 | /*++\r |
| 2 | \r | |
| 3 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r | |
| 4 | Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
| e3ba31da | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 79e4f2a5 RN |
6 | \r |
| 7 | \r | |
| 8 | --*/\r | |
| 9 | \r | |
| 10 | #include "Host.h"\r | |
| 11 | \r | |
| 79e4f2a5 RN |
12 | /**\r |
| 13 | Transfers control to a function starting with a new stack.\r | |
| 14 | \r | |
| 15 | Transfers control to the function specified by EntryPoint using the new stack\r | |
| 16 | specified by NewStack and passing in the parameters specified by Context1 and\r | |
| 17 | Context2. Context1 and Context2 are optional and may be NULL. The function\r | |
| 18 | EntryPoint must never return.\r | |
| 19 | \r | |
| 20 | If EntryPoint is NULL, then ASSERT().\r | |
| 21 | If NewStack is NULL, then ASSERT().\r | |
| 22 | \r | |
| 23 | @param EntryPoint A pointer to function to call with the new stack.\r | |
| 24 | @param Context1 A pointer to the context to pass into the EntryPoint\r | |
| 25 | function.\r | |
| 26 | @param Context2 A pointer to the context to pass into the EntryPoint\r | |
| 27 | function.\r | |
| 28 | @param NewStack A pointer to the new stack to use for the EntryPoint\r | |
| 29 | function.\r | |
| 30 | \r | |
| 31 | **/\r | |
| 32 | VOID\r | |
| 33 | EFIAPI\r | |
| 34 | PeiSwitchStacks (\r | |
| 35 | IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
| c69fc80c MK |
36 | IN VOID *Context1 OPTIONAL,\r |
| 37 | IN VOID *Context2 OPTIONAL,\r | |
| 79e4f2a5 RN |
38 | IN VOID *NewStack\r |
| 39 | )\r | |
| 40 | {\r | |
| 41 | BASE_LIBRARY_JUMP_BUFFER JumpBuffer;\r | |
| 42 | \r | |
| 43 | ASSERT (EntryPoint != NULL);\r | |
| 44 | ASSERT (NewStack != NULL);\r | |
| 45 | \r | |
| 46 | //\r | |
| 47 | // Stack should be aligned with CPU_STACK_ALIGNMENT\r | |
| 48 | //\r | |
| 49 | ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);\r | |
| 50 | \r | |
| a550d468 MK |
51 | JumpBuffer.Eip = (UINTN)EntryPoint;\r |
| 52 | JumpBuffer.Esp = (UINTN)NewStack - sizeof (VOID *);\r | |
| 53 | JumpBuffer.Esp -= sizeof (Context1) + sizeof (Context2);\r | |
| 54 | ((VOID **)JumpBuffer.Esp)[1] = Context1;\r | |
| 55 | ((VOID **)JumpBuffer.Esp)[2] = Context2;\r | |
| 79e4f2a5 RN |
56 | \r |
| 57 | LongJump (&JumpBuffer, (UINTN)-1);\r | |
| 58 | \r | |
| 79e4f2a5 RN |
59 | //\r |
| 60 | // PeiSwitchStacks () will never return\r | |
| 61 | //\r | |
| 62 | ASSERT (FALSE);\r | |
| 63 | }\r |